Rick (W-A-one-R-K-T) wrote:

Typically, can ham-bands-only receivers such as the Drake R4 and Collins
75A or 75S series, transmitters such as the Collins 32S and Drake T4
series, and transceivers such as Drake TR-4 and Collins KWM-2, be modified
to work on CAP and MARS frequencies?

The KWM-2 was designed as a wideband radio and can cover most of the HF
bands. They were sold to many government agencies and the ham market was
a small part of the total sales. The ham models are only lacking the
full crystal board to be used across the band.

I believe the TR-4 was also originally intended to cover the full HF bands
and the ham version is only lacking some minor options.

How can I determine which radios are modifiable that way, and also where
is a good place to get crystals these days?

By reading the service manuals. ICM is a good source for crystals and
are fine folks to deal with.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."