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Re: LF: 472.5 KHz OK for Xtal CW qrg ? GB4FPR

To: [email protected]
Subject: Re: LF: 472.5 KHz OK for Xtal CW qrg ? GB4FPR
From: wolf_dl4yhf <[email protected]>
Date: Tue, 08 Jan 2013 23:17:51 +0100
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Certainly yes... reminds me of my first MF transmitter (which was "CW only"). It used two crystal oscillators separated by 472 to 479 kHz, but I had to detune one crystal during receive because even if the mixer was not powered, enough signal escaped from the oscillators and mixed 'somewhere'. This created a permanent audio tone in the receiver.

73,
 Wolf .

Am 08.01.2013 23:09, schrieb Graham:
Thanks  Wolf
 
Ok   the  Tx uses  qty-2    xtals  , with  a keyed  mixer  for  full  break-cw  , no tune facility
 
Assume   472.1  >>  472.3  is  ok as well ?
 
G.
 
 

Sent: Tuesday, January 08, 2013 9:54 PM
Subject: Re: LF: 472.5 KHz OK for Xtal CW qrg ? GB4FPR

Hi Graham,

If you can pull the crystal a bit (which should be ok with a series C, or a combination of L+C), it's ok.

If you can only operate on exactly 472.5 kHz, potential QSO partners on the continent may have a problem to receive you because there is a permanent carrier on 472.5 kHz, sometimes quite strong in this part of DL.

Depending on the other side's filter bandwidth, a few dozen Hz away from 472.5 kHz to either side will improve things.

If I had to use a fixed xtal frequency, I'd go for 472.3 to 472.4 kHz. Still close enough to be heared by lazy people (like myself) who 'park' their receiver on 472.5 kHz with 500 Hz IF bandwidth while doing other things in the shack :o)

Cheers,
  Wolf .

Am 08.01.2013 22:22, schrieb Graham:
472.5  KHz  OK for  Xtal  CW   qrg  ?  GB4FPR
 
I did  ask  this  a while  ago,  but to  re-confirm  suitable   qrg  for  xtal  cw      472.5  KHz  ? 
 
Tnx -G..


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