Need 7th 0vertone xtal

[George Francis]

Hi:

I need two or three 7th overtone xtals for a receiver osc.(2mtrs.) at
168.315Mc. OR if I put the osc. on the low side of R.F I can use a 5th
overtone (assuming they can be cut for a fund. above 20Mc.) at a
frequency of 125.715 Mc. Where can I purchase so few? With miniumum
delay? The I.F. is 21.3 MC and the repeater is at 147.015 Mc. Thanks,
GHF

 

[George Francis]

dd <dd@ddwyer.demon.co.uk> wrote in message news:<tSgSLEBzjaaBFwrN@ddwyer.demon.co.uk>...

In message <9b58ea86.0410100758.756c1040@posting.google.com>, George
Francis <w3ase@comcast.net> writes
Hi:

I need two or three 7th overtone xtals for a receiver osc.(2mtrs.) at
168.315Mc. OR if I put the osc. on the low side of R.F I can use a 5th
overtone (assuming they can be cut for a fund. above 20Mc.) at a
frequency of 125.715 Mc. Where can I purchase so few? With miniumum
delay? The I.F. is 21.3 MC and the repeater is at 147.015 Mc. Thanks,
GHF
Most crystals now come from the far east in volume not 1 offs.
Small local manufacturers can be found who buy in blanks and do the
final adjustment themselves.
Blanks (fundental) up to 30 MHz are common now.
A major problem is having the equipment to adjust at 5th or 7th overtone
.
In the UK try Quartslab (Kent?)

Thanks.....I had trouble finding the Quartslab site. I had ordered
from them in the past. Thanks for reminding me. GHF

 

[George Francis]

Tim Wescott <tim@wescottnospamdesign.com> wrote in message news:<10ml9fp1smasfdc@corp.supernews.com>...

George Francis wrote:
Hi:

I need two or three 7th overtone xtals for a receiver osc.(2mtrs.) at
168.315Mc. OR if I put the osc. on the low side of R.F I can use a 5th
overtone (assuming they can be cut for a fund. above 20Mc.) at a
frequency of 125.715 Mc. Where can I purchase so few? With miniumum
delay? The I.F. is 21.3 MC and the repeater is at 147.015 Mc. Thanks,
GHF

JAN Crystals in Ft. Myers Florida and ICS in Texas both offer
5th-overtone crystals that may go up to your frequency. The ARRL UHF
Experimenter's handbook mentions a source for 7th-overtone crystals but
I can't remember if you can get custom frequencies.

Thanks Tim: I was not aware of ICS, and forgot about JAN. Thanks GHF