On Jan 7, 10:38*am, raypsi wrote:
Hey OM:

The only way to make that work is with a converter.
Back in the day before police scanners, I made a converter that
converted the 70cm police band down to the AM broadcast band. 530Khz
thru 1600Khz was the band back then. My converter could put 3 local
police frequencies on the AM band.
All the converter is is an LO, input tank circuit, and a mixer. The
only active component was the LO. I used a CB rock which were dirt
cheap. *Caught the 70cm harmonic into the mixer, getting the police
band down to the AM band.

I made a version that plugged inline with the car antenna and the car
radio, that could be switched in and out.
I couldn't make enough of them, Was the best selling product I ever
made.

73 OM
de n8zu

On Jan 5, 5:17*pm, joeturn wrote:



On Dec 29 2009, 10:00*pm, Tim Shoppa wrote:

On Dec 29, 8:38*pm, Gene wrote:

Tim, thanks for the reply...analog...made in Canada....so i assume it
is a Philco-Ford , unable to find schematic , *will have to do some
reverse engineering to to figure out what cap , is what

Internally most of the good AM car radios I've met had mechanically
ganged slug tuning, although variable capacitor tuning existed too.

I once broadened the band of a Titan 4 reciever by
adding a varible capacitor with a spst it might need another *varible
capacitor with a spdt to get the other end of the spectrum.

That's great if you're comfortable adjusting the mechanics of the
radio internally to get the tracking right. Remember, you won't be
broadening the tuning range, you'll be shifting the tuning range.

Tim N3QE- Hide quoted text -

- Show quoted text -

Raypsi

You cant find the specs on a converter anymore!
I probably used one of your gadgits back in the 70s, the car am radio
was converted to cb band!

My titan 4 reciever had a trimmer just above the vfo to zero its
frequency with the dial reading!

I simply put the trimmers center point to a toggle switch that led to
two other varible capacitors and could go up or below the cb band,
tuning each to a specified value!

I would love to be able to get a converter to fill in the gaps on a
ubc 780 xlt.
A converter to allow it to start at 100 hz and go to 4 gigs will be
your next best seller without having to use the pc software