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Ham bands only rigs, off-band operation?
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 he http://www.collinsradio.org/html/s-l...cessories.html 73, Ed Knobloch |
#2
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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. |
#3
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Ham bands only rigs, off-band operation?
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! Most hams are such cheap asses the idea they should have a service monitor would them **** their pants. Then again, most hams are so old they do that anyway. |
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