Another reference on VHF crystal oscillator circuits (if you can read
German) is:
http://www.axtal.com/data/buch/Kap6.pdf
In particular Figures 6.20 and 6.21 on page 23.
Bruce
Bruce
francesco messineo wrote:
On 9/18/10, Magnus Danielson<[email protected]> wrote:
A simple PLL is not that complex these days. As long as you have fairly
high comparator frequency after dividing down the VCO and reference you
could get away fairly easilly. Standard programmable dividers in the TTL
family and a single chip for phase-comparator will work fairly well.
There is gazillions of examples among hams for this approach.
sure, but I'd need to at least understand what's low noise and what's
not again :-)
-) if there were many others with my same needs, we'd probably find
better to use a modern DDS (share the pcb making and someone who can
do the soldering of such packages), instead, so far the low-VHF people
aren't generally aware that better frontends are possible, you find
lot of work in the HF receivers and next to nothing in the lower VHF
where big signals and intermodulations come from broadcasts and not
from other amateur stations!
Maybe the DDS board from the DMTD project would fit your needs?
maybe, I didn't follow that thread, what DDS chip is used? What's the
clock source?
In this moment I'd pretty much like it fits my needs, also because of
Rick's comment (I would order custom made xtals if it's not going to
cost more than the rest of the parts and if I know what to order).
Regards
Frank IZ8DWF
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