Tim Wescott ) writes:
My 1933 ARRL Handbook does not have a schematic for a 5 to 5.5MHz VFO,
much less a solid state one.

Receivers that used 5MHz VFOs didn't start appearing until the mid '50s
(judging from my meager collection of handbooks -- I only have eight
spanning '33 to '76), with VFO SSB transmitters appearing about the same
time.

I'm sure that was exageration, but they do have a point. 5MHz VFOs have
to be one of the more common items in the magazines and books over the years.
Even before 5MHz came along for use with a 9MHz IF, the books and magazines
were full of VFOs that could be shifted to 5MHz. There was a period when
6MHz was a common VFO frequency, for use with multiplying VHF transmitters,
and those would be even easier to shift to 5MHz than a 3.5 or 7Mhz VFO.

If someone is asking about a 5MHz VFO, they've not looked far. Now,
the case may be that they are looking for something more specific, but
in that case it makes sense to be specific.

If someone wants out of the book, yes they won't find a 5MHz vfo in the
1933 Handbook. But, once they go that far back not only will they be
tubes, but stability will likely be an issue. 1933 either predates the
laws requiring "crystal-like" stability, or such laws were recently passed.
Look at the diagrams from that era, and a lot of later concerns in
construction haven't come into common place.

Michael VE2BVW

Someone who was actually alive at the time, or with a more extensive
collection, may be able to contribute more.

Scott wrote:

I'm pretty sure every issue of the ARRL Handbook ever published has had
a schematic for just such a critter...haven't got one for several years,
but they USED to have a design...

Scott



Dave Platt wrote:

In article . com,
k9jri wrote:


I am looking for a contruction artical or some other starting point for
a solid state 5 to 5.5 mHz. VFO to use with my PSK-20. Hopefully
somebody can point me to a contruction project, a kit or a source of a
VFO.



Buying a copy of "Experimental Methods in RF Design" (the successor
text to "Solid-State Design for the Radio Amateur") would be a very
good place to start reading. These guys have written down a vast
amount of very practical information and experience about how to do
this sort of thing well and reliably.

http://www.bright.net/~kanga/kanga/KK7B/uvfo.htm is a "universal" VFO
kit which you might be able to adapt for your needs.

Doug Demaw W1FB had another "universal VFO" design in his "QRP
Notebook" (a great book if you can find a copy). You can buy a kit
for it (board, semiconductors, air-variable cap, copy of the
construction article) for $30 from

http://www.danscloseoutsandspecialde...closeouts.html

I've bought stuff from Dan a couple of times and have always been
satisfied with what I've received.



--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Posting from Google? See http://cfaj.freeshell.org/google/

"Applied Control Theory for Embedded Systems" came out in April.
See details at http://www.wescottdesign.com/actfes/actfes.html