[HSMS] Keyer and Audio Oscillator CircuitsDate: Fri, 07 Nov 1997 23:51:06 +0000 To: firstname.lastname@example.org From: John, PE1OGF To: "Shelby Ennis, W8WN"
Subject: Re: [METEOR-SCATTER] Keyer & Audio Osc Hello Shelby, RR on your keying problem one thing you 100% sure CAN'T use in a HS-CW keyer circuits are capacitors (normally used to prevent against key-clicks) Just a few pf certainly not more... If you ever have to modify a rig for HS-CW just look for this capacitor and for 95% you get the rig running on HS-CW on the key-jack. But in most of the time you also introduce key-clicks so switching over to or just making a right start with audio keying is a good action.. It seems you Americans took a run on High speed CW meteor scattering... Well done !! Hope it will be just as popular as it is here. Just a few operators do make SSB skeds almost ALL operators are running high speed CW but in some parts of Europe (mainly eastern Europe and (EX)Russia) most operators have their maximum speed on 1000 some on 1200 lpm. I've tested 9999 lpm here in the shack on a Icom 202 without any modification on the keying circuit and was good detectable. Making a high side tone gives a problem in both RX and TX because the IF filtering is from about 300 Hz to 2700 Hz so if your tone is above this 2700 Hz it will not (fully) pass your IF filter. What can be done is listening in FSK mode or as in the DTR using a up converter on RX. I run normally 2000 - 2500 lpm on the normal 800 Hz side tone I only shift my RX about 500 Hz so I get a 1300 Hz signal.. Than I use my DTR which has a up converter (if I need) I just as easy copy CW on 100 Hz as on 800 Hz or whatever.. (Hope you understand what I mean... as English is not my mother-language) 73! de John email@example.com Take a look at my Web-site at: PE1OGF list keeper of firstname.lastname@example.org
Comments: Rein, W6/PA0ZN