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Ham bands only rigs, off-band operation?
On May 8, 9:29 am, Edward Knobloch wrote:
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 Collins CP-1 crystal pack provided general coverage HF operation for the S/Line and KWM-2 equipment. A listing of available operating frequencies is hehttp://www.collinsradio.org/html/s-l...cessories.html There is a dead band that is not usable on these, 5 to 6.5 MHz. Also you need a lot of xtals. Even with the expansion board you can only have if I remember 30 of them. There were external VFOs that provided all the possible frequencies for both the xtal osc and the VFO. A Jaapanese company made one. I think a service monitor will do as well if the output level is high enough, most have programmable frequencies like scanners. I think if the weight and size weren't prohibitive the IFR 1500 would be ideal because it's available cheap and because it has full duplex unlike the more common 1200/500 series. You could of course just use a sig gen, again, assuming the level is high enough. No where in the Collins manuals is the drive level needed specified! I'm suirprised a digital internal VFO hasn't been devised for S-Line. |
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