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Ham bands only rigs, off-band operation?
The older equipment referenced, T4/R4, Collins KWM, Collins S-line do not
require any 'modification' to reach the CAP/MARS frequencies. I used the Drake T4XC/R4C for years, 1970 through 1985, at AFF1C/AFB1JX/AFW1MCE and I used the KWM-2A at AGA5HI in the 70s. All that is required is the proper mixing crystal. This class of equipment, however, does not meet the frequency accuracy requirements so external frequency measuring equipment or a FYMON station was required to assure accuracy. The output tuned L/C circuits have a minor impact on the efficiency of the final amplifier. Finally, this class of equipment will NOT OPERATE in selected frequency ranges around the radio's i.f. frequencies. More modern equipment can be modified to operate on CAP/MARS. Check the various use groups for specifics. I have 'opened-up' my IC-746 and IC-706MKIIg without any problems. /s/ W1MCE 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? I know that some radios have provisions for installing crystals so that they'll work on off-band frequencies. How can I determine which radios are modifiable that way, and also where is a good place to get crystals these days? |
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