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..
