[Collins] Off Freq... Need Collins XTALs

[Dr. Gerald N. Johnson]

On Sun, 2007-01-14 at 11:18 -0600, k1kq at motorhomesusa.com wrote:
> Hello Folks:
> 
> I'm looking for the USB XTALs for my 32S-1 and 75S-1. They are off frequency and I'm chirping like a bird on transmit. 
> 
> We have determined that between the xmtr & rcvr radios, one XTAL was high and the other is low netting a total difference between the 2 XTAL'S of 104 cycles. We tried to put a pot on the crystal in the transmitter to pull it down to 456.350, but no joy. I would be interested in hearing from anyone who has had the same problem with an S-Line.
> 
A pot won't pull a crystal down in frequency. Capacitors will, but may
not move it enough.

> In the mean time, I'm wanting to hunt down 2 XTALs to possibly replace them in both the xmtr and rcvr with good ones. The LSB XTAL's where also off, although not as much, so I may also need a pair of them.
> 
> They are...
> 
> - USB - 456.350 kHz - Part No. BL290-8706-000
> 
> - LSB - 453.650 kHz - Part No. BL290-8705-000

Where did those part numbers come from? No letters in Collins part
numbers.
> 
> I seem to remember an outfit in Council Bluffs, IA and or Bellvue, NE that was supplying the Collins Crystals. I'll post this to the Collins reflector, as well.
> 
That would be Peterson Crystal in Council Bluffs. International Crystal
in Oklahoma City can surely supply as a custom product at a custom
price.

Inrad also carries the crystals, or did, I don't know about the latest
new owner.

There used to be crystals with those frequencies marked on the case at
Collins Surplus, obviously removed. Likely found off frequency at final
test. Lots of that material was bought by Surplus Sales of Nebraska and
priced as if new and in specification.

> Thanks in advance for any help, suggestions or parts you may have.
> 
> Roger Agnew
> K1KQ - Austin - Texas
> 888-536-5500
> 

-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer