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[Linrad] Re: Additional information and tests
- Subject: [Linrad] Re: Additional information and tests
- From: Joe Taylor <Princeton.EDU; joe@xxxxxxxxxxxxxxxx>
- Date: Mon, 30 Mar 2009 15:19:05 -0400
Hi Gabriel and all,
Thanks for keeping us up-to-date on your tests.
Do keep in mind that my own on-the-air experience with the
SDR-IQ/Linrad/MAP65-IQ combination is very limited -- a few
sessions of a few hours each. Most of the time, I use my
tried-and-true MAP65 system and both feedlines from my xpol
The default setups for Linrad and MAP65-IQ in the MAP65-IQ
distribution are simply what I have found to work well for
me... They are not necessarily optimum for everyone's setup.
I will be traveling again from Wednesday through Friday,
this week. If I have time before leaving, I will post
another MAP65-IQ distribution with a few more bug
corrections, somewhat better Linrad parameters, and initial
setups for three different single-channel receivers: SDR-IQ,
SDR-14, and Perseus.
-- 73, Joe, K1JT
Gabriel - EA6VQ wrote:
> Hi Joe,
> I was using MAP65-IQ the whole moon pass yesterday (BTW thanks for the QSO)
> and the result was a little confusing.
> Leif has suggested some changes in Linrad's parameters in order to
> compensate the degraded reception. I will try them next weekend, however
> yesterday MAP65-IQ was not able to decode any signal below -25 dB (level
> according to MAP65-IQ) and often it was also failing decoding signals that
> were -20 dB in WSJT, so I looks like there is something else. (I have
> screenshots of this situation in case you are interested).
> Regarding the other problem I reported, the reception stopping from time to
> time, I have some more details. The reception is not resumed after clicking
> on the waterfall (as I thought before), but it starts receiving again on its
> own. If I leave the program receiving, without touching anything, after a
> while it stops receiving for one, two or three periods, then it starts
> receiving again.
> I tried fully disabling the antivirus program and the problem persists, so
> it's not an effect of the antivirus. I will stop other programs and services
> running in the computer and see if I can find what is causing this.
> I have just read your post to Linrad reflector and I'm sure it must be a
> problem with my setup, but I was using the default values of the Linrad
> installation that comes with MAP65-IQ, so I don't know....
> Furthermore, if I use Linrad's audio output to feed WSJT (in the same
> computer, using the VAC software) the reception is perfect, always within 1
> dB regarding the reception with the Kenwood TS-790 (sometimes 1 dB better
> with the TS-790, sometimes 1 dB better with Linrad)
> I think I already mentioned it before, but the computer is a DELL D630
> laptop with a Core 2 Duo processor at 2.3 GHz and 2 GB of memory. The CPU
> load is never very high, even during the decoding proceess it never goes
> higher than 40%-50% (about 15% during reception)
> 73. Gabriel - EA6VQ
> Web-Site: HTTP://www.vhfdx.net <HTTP://www.vhfdx.net>
> VQLog 3.1 (build 56): HTTP://www.vqlog.com <HTTP://www.vqlog.com>
> Real-Time Propagation maps: HTTP://www.vhfdx.net/spots/map.php
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