"KU2S" wrote in message
...
Hi folks.. Have a Regency HR-2A that I want to re-crystal for packet
use, but don't have the manual, and therefore do not have the formula
for calculating the frequency of the receive and transmit crystals for
desired frequency of operation. Could anyone out there help with this
info? Hamfest coming up this weekend and I'd like to shop for
crystals. Also, is there a .PDF of the manual available anywhere?
I've searched the web and there are plenty of folks who'll sell me a
photocopy of the manual for anywhere from $15.00 to $25.00, but to be
honest, that would exceed the value of the radio... Any help would be
greatly appreciated...

Thanks much, and 73!


Raymond Sirois KU2S
SysOp: The Lost Chord BBS
607-733-5745
telnet://thelostchord.dns2go.com:6000

I know nothing about that rig, but in general you can check if any of the
existing crystals are stamped with their actual operating frequency, and
figure it out.

I assume it's a two meter rig. Normally the transmit crystals will be some
integer fraction of the transmit frequency, like 6 or 8 or 9, so a 144.0MHz
transmit frequency would have a crystal frequency of 24MHz (6x), 18MHz (8x)
or 16MHz (9x). Receive will be receive frequency +/- the IF frequency
(almost certainly 10.7MHz), divided by some fraction, so 144MHz would be
something like 19.338MHz ( (144 + 10.7)/8 ) or 16.663MHz ( (144 - 10.7)/8 ).

This sounds daunting, but if you can noodle around with a calculator without
loosing track (or use a spreadsheet!), you can figure it out.