Hi Chris,
Thanks for your info. I guess you're right about the overtone
crystal. I am gonna try 8Mhz and triple it.
73
Ruud.
--- In BITX20@..., "vdberghak" <vdberghak@z...> wrote:
Hi Ruud,
there is something wrong with your VXO. With a 13 MHz VXO that I
and
an other ham use, a frequency shift of about 60 kHz can be reached!
I think you can only shift so less because you do have the VXO
directly on 24 MHz. Because that is an overtone x-tal, it will not
work as a VXO. What you can do is make the VXO with that x-tal on 8
MHz, then tripling it. Likely you will have then more then hundred
KHz shift possibility.
Good luck,
Chris.
- The oscilator in my BITX20 will (if possible) be a VXO on
24MHz.
The reason for this is simple: lots of cristals in the junkbox
and
a
good supression of the signal by the Pi-filter. I can vary tot 5
kHz
when I use three crystals. But the frequency of the oscilator
also
goes about 5 Kc up when a crystal is added!
The VXO is not ready yet. I still have to work for enough output
for
the balance mixer.
