[HSMS] Keyer and Audio Oscillator Circuits
Date: Fri, 07 Nov 1997 23:51:06 +0000
To: hsms@tree.net
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 pe1ogf@iaehv.nl
Take a look at my Web-site at:
PE1OGF
list keeper of meteor-scatter@qth.net
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Comments: Rein, W6/PA0ZN