432 MHz AND ABOVE EME NEWS
July 2002 VOL 31 # 8
ALLEN KATZ, K2UYH
ENGR DEPT., THE COLLEGE OF NEW JERSEY, TRENTON, NJ 08650-4700 (W 609-490-2817
OR H 443- 3184, FAX 609-443-1713, AND EMAIL:
Allen Katz, K2UYH
PRODUCTION ASSIST: BRIAN MULLANEY, KB2TIS or (609-883-6390)
NETNEWS EDITOR: G4RGK, DAVID DIBLEY
EME DIRECTORY: DL4EBY/DK0TU, KLAUS TIEDEMANN,
HALSKESTR.35, D-12167 BERLIN, (49-30-7955467), E-Mail:
***E-MAIL LIST COORD: Warren, W2WD ***
*** NA EME BBS: 704-284-4854 ***
14.345, 10 AM ET SATURDAYS, AFTER VARO NET SUNDAYS:
June 70 cm activity was dominated by the ill-fated
W2WD/0 dxpedition. Warren and company tried very hard, but Murphy
was the winner this time. Persistence did pay off and 3 stations
were able to add Nebraska to their states list. Tnx for a good
try. Full details can be found at the end of this NL. The news on
23 cm is that N2UO is now QRV and giving out initials. 10 GHz was
also will represented this month. The growth in activity on 3 cm
is indicated by the reports. More than 20 percent of the reports
involve activity on 3 cm! Otherwise the reports are almost
equally divided between 70 cm and 23 cm, with 432 having a slight
edge, and with a sprinkling of reports for the other microwave
Greg reports working I4TTZ on 10 GHz EME
(O/O) on 16 June for initial #34. Nothing was heard from OK1CA
Michael writes that he's back on 432 MHz EME. His
equipment is 4 x BV 7.5 wl yagis and 1 kW PA. His web page is:
[Tnx to DL4EBY for forwarding
this report. DB6NT will replace DK0NA in the EME Directory.]
Juergen was active on 70 cm EME in June.
Despite some tree blockage, he worked KO7N (419/429) and PA0PLY
to bring him to initial #388.
Tom (DJ5RE)writes for his EME
team -- Our club station, DL0AO, is now ready for 70 cm EME. The
problem is there is no linear at the location, and I have to
bring mine from my home QTH. So we have to be active in blocks of
time. The rig is 4 x 11 lambda BV yagis, 700 W at the antennas.
We were planning to try our first EME operation on 15 June, but
when testing we discover my protection-circuit activated at a few
hundred watts. Turning round the slug of my bird-meter showed
lots of reflected power. I discovered water running out of the
connectors of the yagis! We used 1/2" HCF for stacking with new
connectors by "Telegärtner". The connectors use lots of O-rings
to make them waterproof. The whole was extra sealed with lots of
high-quality tape. It is not clear where the water came from. We
hope to be able to try again in July. We are interested in skeds.
All instructions/tips are very welcome.
Gerald (JN48ou) was QRV on 70 cm on June
13th. I had a sked with K9SLQ, which failed in spite of very good
echoes. During the last period of the sked HB9SV called me, and
we made an easy QSO (599/5599). Later I worked KO7N (O/O) for
initial #75 and US state 18. During the normal SW I only heard
HB9SV. Activity seemed to be very poor. DL9KR, VK3UM, DJ3FI and
VK4AFL sent me a lot of helpful information and photos of their
open wire/tube feed systems. I already have the copper wire for
an open feed harness. I will look at the local ham radio fair for
PTFE for the spacers and suitable dipole material. If I can
arrange for Al welding, I will go for an all one-piece open tube
feed. I am also planning to enlarge the array from 8.5 to 10 WL
yagis, to add a DB6NT preamplifier. In total it will be a great
improvement of my system (~ 1.5 dB more RX gain). I hope to have
the new system ready before the EME conference in Prague.
Somebody wrote in the last newsletter about poor QSLing. I have
had the same experience. All QSLs were sent out via bureau or
normal mail. Only a few QSLs were received via bureau. So I
suggest that everyone bring missing QSLs to exchange in Prague. I
will contact the stations by e-mail whose QSL cards didn't arrive
and ask them to bring their QSL to Prague. Nevertheless I am very
excited to see all EME hams there.
Juergen is QRV on 1296 -- I
worked some nice contacts this weekend with my 10' dish and only
100 W at the feed. QSO'd on 14 June at 1640 OZ6OL (429/429) and
1725 K5JL (429/429), 15 June at 1130 JA6AHB (O/429) 1345 G4CCH
(529/439) 1528 GW3XYW (449/449), 1541 F1ANH (O/M) 1548 G3LTF
(529/529) and 1720 W2UHI (539/529), and 16 June at 1615 VE1ALQ
(O/O) on sked. My homepage is:
Philippe's EME activities follow –- In the
Italian EME Contest I QSO'd on 70 cm 22, on 23 cm 17, 13 cm 4, on
6 cm 4 and I6PNN for initial #17, and on 3 cm I5PPE and I4TTZ for
initial #24. During the June SW I worked on June 13th on 1296
FANH (33/33) and F6ETI (32/32) both on SSB, and on June 15th on
10 GHz AA5C (O/O) on random, OK1CA (O/O) and OK1UWA (O/O), and on
June 16th on 2320 OE9XXI (55/55) on SSB. I shall make a
demonstration of EME on July 13th between 1800 and 1900 on
1296.020. This will be for a group of none radio amateurs and
would like to be able to contact as many SSB stations as
Philippe's June report. I was on 1296
MHz EME, random CW, and worked on 15 June G3LTF and GW3XYW, on 16
June G4CCH, OH2DG, IK2MMB, K0YW and OE9XXI, and on 17 June heard
three party QSO between K5JL, W2UHI and WA1JOF and QSO'd K5JL and
W2UHI, but not WA1JOF, later OZ6OL and CWNR IK3COR - heard with
W2UHI. The station is still a 3.2 m dish with about 150 W at the
feed and a 0.5 dB NF LNA.
Peter writes -- I was very
sorry that the W2WD/0 expedition didn't work out well, and sorry
for all the effort and time they put in to little avail.
Hopefully it will encourage some locals to put Neb on 432 EME on
a more permanent basis. On 13 June I had a sked on 432 with
PA0PLY, but although he was (549) he could not hear me at all. I
was active on 15 June and worked on 1296 JA6AHB, F6ETI, DL8OBU
for initial #188 - Juergen has a good signal for 100 W and a 3 m
dish, and F1ANH, and on 432 KO7N initial #359, and on 16 June
VK3UM and JH4JLV - condx were excellent at this time with sharp
polarization. I heard later on 432 UA3PTW, VE1ALQ, SK0CC, K5WXN,
KU4F and PA0CSG. I ran my new 432 PA on the skeds with W2WD/O and
it worked fine. It has a lot more in hand than the K2RIW and uses
fewer fuses! Sun noise on 432 was 16 dB with a flux of 133.
David notes the following -- One small
correction to last month's NL where K5PJR asked about tracking
programs that run on Linux for a polar mount. I see that my
"MoonSked" was recommended, however please note that MoonSked is
not available for Linux, only for MS Windows and Macintosh. It
can be run under a Windows emulator in Linux however, and I think
DK5YA mentioned that, so I expect this is where the confusion
arose. [MoonSked software - Tracking, Prediction, Scheduling and
much more is available for either Windows or Macintosh, also
PalmTrack for Palm OS at"
Stuart observes -- EME Activity during
the June SW seemed quite high on 23 cm particularly on Sunday.
Contacts obtained were as follows: Saturday 15 June F6ETI? (339)
– partial, F1ANH (559/559) and DL8OBU (449/449), and Sunday 16
June OZ6OL (559/559), G4CCH (569/569) and (54/54) on SSB, IK2MMB
(559/559), IK3COJ (539/339), OH2DG (559/559), OE5EYM (559/559),
K0YW (569/579), W4OP (449/449), VE1ALQ (569/569) and W2UHI
(559/549). On Saturday I also ran some tests on 10 GHz EME and
heard I4TTZ, OK1CA and OK1KIR. All had a T7 (Gurgle) tone. I
called I4TTZ and after some time got a QRZ but no contact. I am
probably running less than 10 W with a well-used TWTA (originally
rated at 10 W). The antenna is a homebrew 9' (2.7 m) 0.5 f/d
Dan's NL weekend report -- We will be QRV on
144, 432 and 1296 for a few hours on July 13th and maybe on the
14th. If anyone would like a sked let us know. We worked the
following new stations in June for a total initial count of #184.
We worked on June 8th at 1038 DB6NT (429V/539), and on June 15th
at 1750 4L/ZL1RS in LN21 (O/O). Bob has 4 short yagis and
approximately 50 W. We also worked our 1st JT44 via moon on 144
MHz. This was very interesting experience and we are now ready
for JT44 on 432 and 1296 and are interested in skeds. HB9DBM and
myself (HB9CRQ) will be attending the EME Conference in OK in
Vico (I4ZAU (JN54J) reports on his groups
June 10 GHz EME activities – We were QRV on June 15th and QSO'd
at 1525 I5PPE (O/O) on random, 1545 F3VS (O/O) on random, 1615
OK1UWA (O/O) on random, 1710 OK1KIR (O/O) on sked, 1740 OK1CA
(O/O) on sked, 1910 VE4MA (O/O) on sked and 1945 AA5C (O/O) on
sked. We heard for a few seconds W6HD and nil from W5LUA. We will
be QRV again in Oct.
Jeff is now QRV on 1296 -- I was active on
15 June between 2000 – 0000, but heard nil. During the SW I setup
skeds with G4CCH and OE9ERC. I think I may have as little as 30 W
at the feed, since I was only seeing about 60 W in the shack. I
run 70' of ½" hardline to the feedhorn. They both heard me with
(M) copy and full calls. The biggest problem I have is frequency
drift on the transverter and not knowing where I am frequency
wise. I think both stations had to hunt around to find me. The
strange thing is I couldn't copy them! They both run very large
stations, so if anything, I should have at least copied them. I
only got bits and pieces of letters. I will be getting an IC-
1271A in the next few weeks. This should cure the frequency drift
and frequency accuracy issue. On 1296, I run a 3.3 m dish with a
minimum elevation limit of 30 degs and about 100 W. I also have 2
x 9 wl yagis with 800 W on 70 cm and have made 2 initials there.
Mike had had fairly bleak results on 432 during June -- I
got lots of emails for not QRV or cancel for my June sked, which
I really do appreciate. On 14 June I only had a repeat QSO with
SKØCC and a partial with S51ZO, but better luck on 15 June with
HB9SV (549/559), I5CTE for a new country and initial #118, PA2CHR
(O/O) #119 and KO7N (539/529) had a very nice signal. Others
heard this weekend were OH2DG, K5WXN, WA4NJP, G3LTF and K1FO -
all with very good signals. I will miss the July SW and not be
QRV until at least Aug as I am re-doing the shack.
Bruce is back in operation on 1296 -- Big echoes and then
lots of QSOs... The new absolute encoder, W6HD based tracking
system is working like a dream. Winds up to 30 mph but the dish
is much steadier with the revised counterweight anti sway
supports and holds to within 0.1 deg in the breeze. I had two
successful sessions on the band. I worked on 16 June GW3XYW
(569/569), DF4PV (569/579), W4OP (559/589), IK3COJ, (439/549),
W2UHI (569/579), G4CCH (579/599), K9KFR (579/579), WA1JOF
(539/539), W7BBM (55/57) on SSB, OE9XXI (599/579), F6ETI
(539/559), IK2MMB (559/569) - a good session with excellent
signals from everyone, and on 23 June K5JL (589/589), N2UO
(529/539) for initial #122 - thanks Marc, W7BBM (559/559), W2UHI
(569/579) followed by K5JL (57/58) on SSB and W7BBM (55/55) on
SSB - signals were surprisingly good at this low declination. On
20 June I heard a station trying out what sounded like MSK 16
"Picolo". I went back on SSB. No demod by me of course, but the
other station was synchronizing his transmissions in reply to
mine. It would be nice to know who and what? [It was K2UYH – see
my report.] I was running my old W7CNK single stage pre-amp and
receiving 23.2 dB of sun noise with it. My other 2- stage LNA
checked out ok at a 0.23 dB NF. I still have lots of little
things to do on the amplifier. 1100 W out is fairly easy to get.
Patti and I have been doing the 8 PM to midnight shift in the
County Emergency Comm. center. Mostly running the evacuation
hotline phones and updating map overlays. Our little blaze has
reached a Type 1 status and has burned over 27000 acres so far!
We have been real lucky with structure losses though, only a
couple of outbuildings so far.
Marc made his 1st 1296 QSO in July -- I
finally got my 23 cm system up and running, after several months
of work. It consists of a 10' stressed dish (f/d 0.45), VE4MA
type feed, 2 x 2C39 water-cooled PA (120 W out with only 1100 V),
auto-tracking, and 0.4 dB NF FHX35 preamp. Sun noise measurements
indicate an antenna gain of around 30 dBi. Power at the feed is
80 W. On June 16 I had a partial with W2UHI (O/O) on sked,
nothing heard from W5LUA (suspect wrong frequency), and I worked
(all on random) OE9XXI (569/449), OE9ERC (569/449) and G4CCH
(549/439). Later I worked K2UYH (449/O) on sked using narrow RF
and audio filters to suppress the terrestrial signal
interference. The following weekend the moon was very low on the
horizon and I only had a one-hour window. Anyway, I worked K0YW
on random (539/529). Right now I am working on a 6 x 2C39
amplifier that I borrowed from K2UYH. That should give me at
least 6 dB more power. I also had the visit of Trevor VK4AFL and
his wife. We had a very good time talking about EME, and later on
an enjoyable dinner with K2UYH and our wives. Trevor is
interested in 23 cm operation, after his success on 70 cm.
Petri wrote -- I'm QRV on 1296
MHz from KP11WL on JT44 mode. I have approx. 40 W power and a 25
dBi antenna gain [linear pol yagis] and RX system NF is approx.
0.6 dB. So I'm really "small gun". CW skeds with BIG GUNS are
also possible. [Petri and I have exchanged calls both ways by
JT44 – see my report.]
Franta writes -- I had my 1st QSO on 3.4 GHz
EME. I worked on 13 June W5LUA (O/M) for initial #1 crossband
3400/3456 MHz. This was the 1st EME QSO on 3.4 GHz from OK, the
1st OK/W and I think that the 8554 km dist is a world record. I
have on 3.4 GHz a 3 m dish with linear scalar horn, FT736R + TRX
DB6NT, PA with 15 W at the feed and LNA with ATF36077. I was QRV
on 10 GHz on 15 June and I worked I4TTZ (O/O) for initial #6 and
F2TU (O/M) #7.
Jan updates his activity -- I
arranged a lot of skeds outside the SW. I was happy to find so
many OMs QRV on 432. Results were on June 13th nil UA9FAD,
partial VE1ALQ - No report copied, nil K9SLQ, partial HB9SV (529)
called on random between 2 skeds, nil DL4KG, nil OE3JPC and nil
G3LTF. It was very frustrating to me after such a good result the
month before. G3LTF reported coping me vertically, which may
indicate Faraday was a problem. On June 18th I tried again with
DK3WG, OE3JPC and UA9FAD with same frustrating results. On June
20th I had another try with OE3JPC, OK1KIR and DK3WG. Still nil
with OE3JPC and OK1KIR, but I worked DK3WG (M/O) for initial #17.
I will be at EME conference and am trying to collect QSOs for the
Keppler Award, but am still missing OK on 432. We will try again
Jac reports his first 13 cm EME
QSO – I worked, OE9ERC (549/339). His outstanding station made it
possible because I have only a QRP rig for this band: 2.5 m dish,
30 W and 0.6dB NF at the feed. I heard Erich from the beginning
and even during echo testing. I'm looking for more QSOs and
interested in skeds.
Sven (SM5LE)reports -- I have
renewing the whole 70 cm antenna (15 years old). I have installed
new driven elements and gotten rid of a lot of corrosion. The
return loss went from -11 dB to -25 dB! There was 1.5-2 dB more
sun noise and 0.65 dB better transmission loss. I heard a lot of
stations during the June SW including DL9KR (who doesn't), DJ3FI,
OH2DG, DJ5NV, ON4KNG, WA4NJP, KU4F (worked), EA3DXU, UA3PTW,
HB9SV and OE3JPC, but not W2WD/0. I also worked KL6M, and on 18
June at 2100 PY5ZBU (M/O) - but solid. Don says he is available
for EME sked on 432 MHz. Most of the heard stations were called
but NIL. SK0CC still has a TX transmission loss of 3 dB (94 m of
7/8") - an "unsolvable" problem?
Doug managed to get on for a short
time during the June SW – I found conditions 'normal' and worked
the following (no new ones) all on random on 432: 15 June at 1009
VK4AFL (559/559), 1037 DL8OBU (539/549) and 1054 JH4JLV
(539/449), and on 16 June at 0223 K9SLQ (559/559), 0244 K1FO
(569/569), 0254 KU4F (569/569), 0300 N9AB (559/569), 0315 JA4BLC
(339/559), 0335 JA6AHB (549/559), 0910 UA3PTW (549,569), 1106
OM1TL (439/449), 1116 G3LTF (559/569), 1123 DF3RU (559/559) and
1134 G4YTL (549/549). I leave on 16th July for Eur and will see
you in Prague!
Frank was on 23 cm in June as usual. He worked during the
pre SW F1ANH, G4CCH and DL8OBU for a new one, and during the SW
at 0153 W7BBM, 0206 K0YW, and 0217 K5JL – all with good signals.
He heard N2OU and CWNR.
WArren sends the following summary
report on his dxpedition -- We were extremely disappointed that
we could not help all the people needing a Nebraska contact
towards their WAS via EME. It was not because of lack of effort.
There were many Nebraska hams that worked very hard to get the
station up and running in a short period of time... none more so
than the hosts, Bill, K9RZ and Karen, N0KWH. They were there
through the whole process of fixing one problem after another. On
432 the antenna was a 20' portable dish on a polar mount, preamp
MGF-4918D at the ant, power at ant was 350-500 W. Stations worked
were K0RZ, KL6M and WA4NJP. Stations heard were DL9KR and K2UYH.
[Warren full report is at the end of this NL.]
Al worked in June during the pre SW on 9 cm OK1CA
(3456/3400 crossband), on 24 GHz RW3BP (O/O) but did not complete
with AA6IW and VE7BLD, on 3 cm I4TTZ, and heard nil on 13 cm.
During the SW Al added an initial on 23 cm with DL8OBU and heard
W2UHI trying to work N2UO, but did not hear N2UO. He is trying to
resurrect 24 GHz TWTs.
Tommy writes -- It has been a
while since my last report. We moved to a larger house with less
yard space in April/May and are now close to seeing the last box
get folded up. No major antennas are up yet, other than in the
attic and wire antennas. No towers can be put up (restrictions)
but maybe a small dish for 5.7 GHz and a temporary yagi array for
222 and 432 MHz EME. We will hold off from other bands for later
construction. I am still working on LNAs and down converters, but
allowing more time with family activities. My new address is 3017
N 2nd St, Broken Arrow, OK 74012 and tel is 918-355-5839.
Ivo does not have much of a report
for June -- Unfortunately we had real lousy weather in the month
before the June SW and I did not manage any repairs on the dish
drives etc. According to meteorologists it was coldest weather
for last 42 years! I hope to be ready for the July SW at least on
23 cm. With my left hand still lousy, the repairs will take quite
I had my 1st experience with JT44 this past month and was
impressed. I ran with OH3MCK twice on 16 June. Petri is running
2 yagis and 40 W. I do not believe I could work him without
using JT44. The 1st time at 2000 I copied full calls with in 3
minutes, but he did not hear me. It was actually pure luck that
I heard him. Frequency is very important with JT44. You must
have your frequency correct with in 600 Hz, including the
Doppler. This is not too much of a problem on 144 MHz, but on
1296 MHz you have to be very careful. An error of 100 Hz on 2 m
is nearly a kHz error on 1296. This will take the signal out of
the receive window. You must also correct for the common Doppler
shift, not the shift of your echo. The JT44 program gives your
echo Doppler. This may be ok on 144 where the maximum Doppler
shift is about 300 Hz, but is unacceptable on 1296 and even 432.
During the sked with OH3MCK, my echo Doppler was about 2 kHz,
but the common Doppler was less than 50 Hz. [Programs as VK3UM's
Moon Tracking Program give the correct Doppler shift when
calculating the common window between stations.] During my 1st
sked, I reset my frequency so that the JT44 signal on my counter
read the sked frequency (.033). This put me about 1.2 kHz low
from the frequency I had previously set on CW. I now realize
that the SSB mode (0 Hz) freq and the CW mode freq are the same.
However, I made a 2nd error that compensated for this on RX. I
forgot to change my Doppler frequency correction. I had
previously set it to receive my echoes that were about 2 kHz
high. This compensated for the TX error. I had calculated this
earlier, but as noted forgot to make the change in my RIT. I was
thus receiving near the right frequency, but transmitting about
2 kHz low. This explains why Petri did not copy me. We tried
again an hour later. This time Petri copied full calls, but I
received nothing. I am not certain what went wrong on our 2nd
try. I put my TX frequency back to where I had measured it with
the CW carrier and turned off my Doppler correction. Possibly
this was my mistake. The Doppler was now between about -300 and
-500 Hz and I did not try to correct for it. Later I found that
my counter was reading about 600 Hz high, which should have
partially compensated for the Doppler. We tried a 3rd time on 19
June at 2200 with nil results at both ends, but this was at low
moon elevation and Petri had a tree directly in front of his
yagis. I am interested in trying more JT44 skeds on 70 and 23
cm. I believe that JT44 can give even greater benefits for EME
on 432 and 1296 than on 144, if we can get our frequency
correct. [On 1296 the SETI beacon offers an excellent way to
check your frequency, if you can detect it. It is accurate to a
few Hz. Obviously, you will have to correct for Doppler.]
on 16 June I worked on 1296 at 2145 N2OU (439/449) for initial
#202 and 2202 OZ6OL (559/569). I also spent a considerable
amount of time on 70 cm looking for W2WD/0. Others heard were
K1FO, VK3UM, WA4NJP, K0RZ and KL6M. I finally copied them on
Sunday night (17 June), but missed connecting for a QSO.
G4RGK, DAVID DIBLEY
K6IBY's 70 cm antenna system is now completely operational. Joe
will run on random until further notice. He is pleased with
system so far.
W6FOG is asking about dishes for 23 cm. (The minimum rule is 10'
100 w, which should hear echoes). E-mail Neil with any info or
ideas to email@example.com.
UA3PTW had initials with DB6NT, JA4BLC and KO7N on 70 cm in June.
K5WXN has a new e-mail address firstname.lastname@example.org.
F5SDD is the proud father of a new son (2 kg and 48 cm)!
W4SC (EM93iv) has picked up his 18' dish from K2DS. He now has a
dish and PA for 23 cm EME. He is looking for feed info.
W4AD copied WA7CJO off the moon on 10 GHz. He has no TX yet.
W7MEM reports no progress with his 70 cm array and will not be
QRV for the July SW.
GM0ONN will not be available for 23 cm skeds until Sept.
K0RZ reports working W2WD/0 in NE. Bill is now looking for KI,
HI, ND, VT and NV for WAS on 432.
K5JL cleaned out his feed of bird residue and is now back to
normal performance. Jay worked on 23 cm during the June pre SW
DL8OBU, and SW W7BBM, K0YW and W2UHI. He did not hear N2UO.
N4PU is hearing signals on 1296, but is having problems with
tracking the moon.
M3RKL is setting up for 13 cm operation with a 3.5 m dish.
PA3CSG hopes to be on 6 cm in July.
VE6TA is working on a new 18' dish. 4 ribs have been completed so
VE4MA was on 10 GHz in June and worked OK1UWA and I4TTZ for
initials. Barry has his 47 GHz preamp NF down to 4.75 dB and
with a 6' offset dish is measuring sun noise.
W6WE's e-mails has changed to email@example.com.
WA4NJP confirms a 432 QSO with W2WD/0 on random.
W4OP firstname.lastname@example.org has completed the expansion of his
dish. Sun noise is up about 2 dB. He is still working on a YD-
W2TTT in FN30 is listening on 70 cm EME, but has limited power.
DL9KR reports he was on for W2WD/0 but nil heard.
DL7APV was on looking for W2WD/0 too.
WA1JOF's 18' dish is still in progress.
KU4F should be on 23 cm in July. In June he worked on 70 cm
JA6AHB, K1FO and WA4NJP.
DL1YMK is working on amp for 23 cm.
G4RGK was not on in June due to QRL problems.
WA2FGK is looking for a 4' aluminum mesh dish and a dual band
feed for 2304 and 3456 MHz. Contact Herb or Andy at:
WA2FGK or email@example.com.
WD5AGO has for sale an FT726R (2m/70cm)
for $US450. Tommy's e-
mail is: WD5AGO
KD4LT has for sale
an EIMAC Y-834 tube for
$US400. This is the EIMAC clone of the TH-327. This tube is full
output and in very good condition. Also he has a Parabolic 1296
to 144 transverter for $US250,
two Parabolic 144 to 28
transverters for $US225,
his BIG 432 TH-551 PA with K2RIW driver
(will not divide) – "this is a real amp, lets talk", and a VE1ALQ
box for interfacing the F1EHN software to the real world for
$US250. All items are + shipping. Call Scott at 229-890-2506.
VE3AX has a dish package: a new 15' Andrews dish in 2 halves and
2 20' tower sections with a large prop-pitch motor, a new 36"
saginaw actuator and a free 16' fiberglass dish – for pick up
W7MEM has a 432 8-way power divider for sale.
Looking for tubes, you might want to try D & C Electronics, 1848
Chatham Village Dr, Orange Park FL 32003; Phone/Fax (904) 541-
0068; e-mail:D & C Electronics
W4RDI has for sale a Kenwood TS-870, Parabolic 1296/144 MHz XVTR
and 144/28 MHz XVTR.
K1UHF is looking for a 23 cm water cooled 2 tube
amp. Also wants a 40 W 10 GHz TWTA.
W4OP has 2 tube 23 cm PA for sale.
K2DH has the following for sale:
EIMAC/Motorola 903 MHz PA 300 W, PS and spare tubes; Siemens 15 W
TWTA for 3456, 5760 (1mW input), 28 VDC in; Varian 20 W TWTA for
5760 (1mW input), 28 VDC in, DEMI 23 cm PHEMT LNA <.4 dB NF, >16
dB gain, DEMI 70 cm Hi-Dyn Range XVTR model 432-28 10 W output,
<.8 dB NF NEW, (2) 2304 MHz GaAs amps – 0 dBm in, 1 W out for
$US75; 2304 MHz GaAs amp - 1W in, 10 W out, plus many low loss
cables and more.
Rx Noise problem on 432 MHz by G3LTF
I have been troubled for some time by a feed mounted preamp going
into oscillation at certain positions of the dish and at certain
positions of rotation of the dual dipole feed. I eliminated VSWR
change of the dipoles and eventually found that what was
affecting it was the position of the UR67 down lead, which was
loosely tied to one leg of the feed support. I found that I could
induce the oscillation by moving the coax away from the support
leg. When I looked at a spectrum analyzer on the o/p of the
preamp, in the shack, I could see the noise rising as it
approached oscillation . I checked the coax connectors and all
were OK. I concluded that what was causing the feed back was pick
up from the leakage through the cable sheath back into the dish
aperture. I also found that the effect was worst when the dipoles
were in line with the leg and the cable tied to it. The solution
was to tie the cable to the support leg with no loops and at the
back of the leg, away from the aperture. When I'd done all this I
gained 0.5 dB of Sun noise! The preamp is a 2 stage design with
about 33 dB of gain and the down lead is good quality UR67, but I
assume that because the whole length of it was, roughly, being
focused back to the feed the leakage was "enhanced". I never had
this effect before although years ago, at a previous QTH where
the shack was immediately behind the dish and the LO chain was
poorly screened I experienced noise pick up.
HB9CRQ's Toplist now has almost 200 entries, but there
are still many active stations that have not entered their
standings. Please help Dan make the Top List complete and up to
Prague 2002 is only a little over a month away, and as reported
last month will be one of the best attended EME Conference of all
time. You don't want to miss this one! However, Dan, OK1DIG warns
that reservations for accommodation in the EME conference hotel
will be definitely closed on July 3! Any other later attempts for
accommodation must be directly with the hotel and will not
receive the discount and free rooms guarantee provided by the
conference. For details see:
Prague 2002 EME Conference
Please keep the news and technical information coming. I will be
looking for you off the moon.
73, Al - K2UYH
0900z DK3WG -JA3SGR
0930z DK3WG -JH7PAV
1530z LU7DZ -DK3WG
1600z W4ZRZ -DK3WG
1630z W1IPL -DK3WG
1700z K6IBY -DK3WG
THE W2WD/0 STORY
When my xyl's family announced a reunion in Omaha, NE set
for 15 June, it presented a chance to give some of the EME group
a shot at getting a new state for their WAS. Instead of using
the airlines, we could rent a van and drive to Omaha. K2UYH had
loaned us his 20 foot portable dish, which we had tested on a
simplified polar mount. This plus the 432 MHz TX, RX, etc.
would easily fit in the van. But before we made serious plans
for the trip, an impromptu survey was conducted on the Moon-Net
asking how many needed Nebraska on 432 MHz EME.for WAS. The
result was surprising. Very few from the 432 group responded,
whereas there were many, many heartbreaking pleas from the 2-m
gang. It appears that NE has not been on 2-m EME for perhaps a
decade or so. And the KA0RYT operation a few years ago must have
taken care of most of the 432 people. This altered the planning
for the trip. We had 2-m equipment from our satellite operations
of many years ago. A TX using pp 4CX250B's, a MGF-1302 preamp,
transfer relays, etc., and the FT-767GX had the 2-m plug-in. The
antenna was an old Telrex 8-element Yagi. It was FB for
satellite work, and I did raise W5UN on random during one of the
EME contests. But I needed something much bigger for the trip to
NE so as to give most of the EME hopefuls a reasonable shot. I
called the M2 Antenna people and spoke to Mike, K6MYC. He was
sympathetic to the project and agreed to loan us two of his
2MXP28's with the power splitters, crossboom, etc. These would
be drop-shipped to the site in Omaha in time for the
operation. The site in Omaha was arranged by an old friend,
W0LHZ. Joe is a member of the 300-member Aksarben Ham Radio
Club. As is K9RZ, Bill Jackson, who has a 3.5 acre, HF dxer's
dream location on top of a hill, which would provide essentially
unimpeded coverage of the moon from moonrise to moonset. Bill
and his XYLl, Karen, N0KWH, agreed to host the operation from
6/14 through 6/16. We would setup on 6/12 and 6/13 and takedown
on 6/17. So the plans were in place to operate both 2 m and 70
cm EME stations at the QTH of K9RZ. Since the XCVR and power
supply were common to both systems, simultaneous operation would
not be possible.
While preparing for the trip, Mr. Murphy showed up. I had
not used the 432 system for several months so I thought a
routine check before packing it for NE was in order. While
answering a CQ from KL6M, the PA flashed over and blew the high
voltage fuse. One of the pp 4CX300A's was damaged. I put in the
spare set that I intended to take to NE. The same problem
occurred about 30 minutes later when I was calling K9SLQ. I put
out a call for help with 4CX300A's on the Moon-Net and K2UYH
responded with three and WA0TEM sent several more. After cooking
the filaments for many hours, I found two pair that were a
little flaky when pushed a little, but did not blow fuses. I
did not feel too comfortable and was wondering, if the operation
should be called off. About this time, Al, K2UYH, said his old
amplifier had been repaired by K2AH and could be used as a
backup unit. I drove to the Jersey shore and picked up the 7650
PAS. Tom does not have a 432 driver so could not hot test the
unit. He did, however, use a signal generator to set the tuning
controls about right. The tetrode has its screen at chassis
ground for stability and its grid bypassed in a grounded-grid
configuration. I made a quick modification to the HV PS to
provide the proper screen voltage using VR-150 regulator tubes.
When the PA was fired up, the screen was drawing very heavy
current and output was nil. During discussions with Tom on the
phone, it was thought that perhaps the tube was bad, but that Al
had spares. However, Al was on a business trip and would not be
back before I had to leave for NE. Tom suggested I take the
amplifier with me and if I could make further checks to pin it
down to a bad tube, maybe Al could overnight a spare to NE.
While the above was going on, I pulled the 2-meter amp from
the relay rack and to my surprise I found old 4X150A's in it and
the output was way down. I had forgotten that I had sold the
4CX250B's years ago. I could not quickly find any 250's locally
and Surplus Sales in Omaha was out of stock. RF Parts in CA did
overnight a pair of Svetlana's which worked FB. I also had to
order LMR coax, adapters, control cables and all the bits and
pieces that would be needed for the 2 m station. The coax
adapters were misdirected but arrived in time.
With so many things on a shaky footing, I was still
considering calling off the operation, but it was late in the
game. The M2 antennas were on their way to NE and many people
were looking forward to a contact with a new state on EME. If
Murphy would ease up a little and we had some luck in Omaha, I
felt it would be worth the effort. So we packed the van and the
XYL and myself took off for Omaha via I-80.
Before we hit the road, we made reservations for overnight
stops along the way and for our stay in Omaha. We were jolted by
the news that the College World Series was going to start in
Omaha the weekend of our operation and that all hotels/motels
were completely sold out even for miles around the city. We
managed to get accommodations in the small town of Blair, which
is about 17 miles north of Omaha but not too far from K9RZ.
The 1200-mile trip took three days and we arrived in Omaha
on schedule; 6/12. The next morning, we were joined by Aksarben
club members at K9RZ. The van was unpacked and work started on
erecting the dish and installing the TX/RX, etc. The 20
reflector panels are constructed of 1-inch chicken wire held in
place by frames of wooden strips. Progress was slowed by
entangling of the Dacron fish line strings that hold the
reflector panels in place. A photo of the antenna on its polar
mount was included in the Nov 2001 issue of the EME NL. Its F/D
is about 0.5. The driven element is a 1-wl circular loop in
front of a 0.62-wl square reflector. Spacing was adjusted for a
VSWR of <1.1, which was about 0.13-wl. The HF-400/2Z transfer
relay and MGF-4819D preamp are mounted in a plastic box behind
the reflector. Separate coax lines are run to the TX and RX. An
additional preamp was used at the RX to make up for line loss.
The two 2MXP28 antennas from Mike at M2 Antennas were more
of a challenge than originally anticipated even though Mike took
the time to color-code the elements and boom locations. This
certainly helped, but mounting them to the crossboom and then to
a tripod mount required some ingenuity. Several trips to Home
Depot and home workshops finally got the job done. The tripod
was about 5' high which meant that with some droop in the booms
the vertical reflector elements were just above ground with an
elevation angle of about 5 degrees. VSWR was checked at <1.1.
The polarity switching relay, TX/RX transfer relays and MGF-1302
preamp were mounted on a piece of plywood attached to the tripod
at the crossboom. Separate coax runs were used for TX and RX.
The array was setup pointing at moonrise. It was hoped that
several stations could be worked before the moon rose above the
beam pattern. If results were encouraging, several plans were
under consideration to raise the height of the crossbeam and
therefore, the ability to elevate the beam. One idea was to
mount the tripod on top of the van, but the windy conditions on
K9RZ's hill would have made this a risky proposition. When we
were unable to hear anyone including KB8RQ, we tried to rough
check the beam pattern by passing a hand-held through the beam
in the far field. Reflections, scattering and blockage led to
inconclusive results. It was then discovered that the horizontal
driven elements had been inadvertently set out of phase. The
vertical elements had been installed properly. The problem was
corrected for the Sunday moonrise when several signals popped
out of the noise. K9TI was 539 on peaks and we attempted to
raise him but could not make the connection. We later found
that he had heard us also. Someone said that we were on the
wrong frequency. The signals were gone after a short time and
probably the result of ground reflection boost. A near miss but
Wind conditions kept the tie-down ropes on the 432 dish for
Friday, 6/14. My memory is hazy as to what other things happened
and when. It seemed we were tackling one problem after another.
Some were minor annoyances, but they still cut into valuable
operating time. The relays used in the 2 m system were Dow Key
series 60 of 1970 vintage. All contacts had been burnished, but
one of the high-isolation connectors got stuck in the grounded
position and could not be broken loose. Fortunately, I had
brought a spare connector. But it took some time to sort through
boxes to find it and replace the bad one. On 432, the PA was
acting up intermittingly. However, the backup unit was
unavailable. It had been opened early on to check the 7650 tube
for shorts between internal elements. At least under cold
conditions there were none. A quick inspection did not reveal
any obvious problems, so further trouble shooting was put off
until returning home. On Saturday I left operations on 432 in
the good hands of Joe, W0DB and Bill, K9RZ, while I attended the
family reunion in Omaha. When I returned, they reported two
significant happenings. First, a sudden wind storm nearly
destroyed the dish. It took their efforts along with Karen to
hold the tie-down ropes to avert disaster. Second, the D-26-N
brick used as a driver had severely overheated. When it cooled
down, it again acted normally, which is just coasting along to
drive the 4CX300A's. However, it was a fore warning of further
trouble on Sunday. The intermittent problems with the 432 PA
appeared to be tube related so the tubes were replaced in pairs
as the unit is operated push-pull. This is not a "lift the lid
and plug in the replacement" type of operation. The entire tank
circuit has to be dismantled to get at the tubes, which seemed
to take forever under the circumstances. Then, at one point the
brick broke into sustained oscillation with very high current
and quickly overheated. I have used the driver for many years
without any problems, but Murphy had struck again. The unit was
opened after cooling down a bit, but there was no sign of
transistor damage or other indication of trouble, except the
heavy connections from the input/output connectors and the board
grounds looked suspiciously cold-soldered. These were
resoldered using lots of heat and fresh solder. When the system
was fired up, the TX seemed to be acting normal for the first
time, but it was late in the game. It was time for the last
scheduled station, K0RZ. About this time, K2UYH phoned and asked
to be added to the end of the list at 0000z. K0RZ was worked and
then several stations tail-ended which cut in to Al's scheduled
time. Knowing that he had his WAS, we ignored Al and worked
WA4NJP and then KL6M. Following this we looked for Al, but
apparently we were behind his trees or he had given up on us.
Joe, W0DB did the operating during this period. Bill, K9RZ, who
was our official liaison with the sked coordinators and the net,
announced over the Moon-Net that we would be calling CQ on
432.030. When we got no takers, the operation went QRT.
I think we tried to cram too much into a fixed window of
opportunity. As stated before, it was a great disappointment not
to have worked more people, especially those needing Nebraska
for the last state or two. We do hope that the expedition will
result in an EME station operating from NE on a regular basis.
73, Warren – W2WD
Netnotes by K1RQG
This information was obtained from:Scott, KD4LT