On Mar 20, 6:47*pm, ken scharf wrote:
JIMMIE wrote:
On Mar 18, 9:24 pm, Robert casey wrote:
The design used plug-in coils for the osc and rf stages, and
*they were double conversion designs, with a first IF of
*1600 kc and a second IF of either 100 kc or 85 kc (when
*using surplus ARC-5 IFTs.) *The 1800 mc xtal you bought
*your dad was used for the second coversion osc. to convert
*the 1600 kc IF down to 100 kc. *Many hams deviated from
*the exact original IF frequencies (i.e. strong local BC
*station on 1600 kc) which might explain why the xtal

was chosen for 1800 kc instead of 1500 or 1700.
We have a local mid power station at 1600KHz, WWRL, at my parents' house,
so my father might have wanted to avoid problems with it.

His radio had a bandswitch instead of plug in coils, and he'd receive
various broadcast SW stations. *He wasn't a ham at the time just yet.. *

I had a friend who was a retired engineer with GE turned TV tech who
built
one with a band switch and he later modified it to
be more of a general purpose SW receiver. His name was Olin Griggs.

Jimmie.

I once saw an article in 73 magazine showing a HB receiver that used a
re-worked turret tv tuner as a band switch. *The coils were re-wound
onto the original forms, but some have just replaced the forms with some
of the smaller sized toroid cores. *I have a bunch of old tv tuners in
the junk box, but over the years the contacts have gone bad and now show
a high resistance. * Maybe they could be cleaned up, but it no longer
seems worth the effort. *My new idea is to use miniature relays to
switch the circuits. *I recently found nearly a gross of small relays
for free so why not?- Hide quoted text -

- Show quoted text -

I tried the TV tuner trick one time and it didnt work well at all.
Most tuners are tossed because the contacts fail. Various contact
cleaners will only help for a while because wor out is worn out and
there is not a long term fix you can do for them. The exception to
this was a very old one I found that was at least as big or bigger
than a shoe box. Shame on me but I used one like this to build my own
CB radio tx. I was using it to switch crystals and trimmer caps for
the osc.


Jimmie