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Contesting Online Forums : Tips : SO2R Forums Help

1-4 of 4 messages

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SO2R Reply
by on4bcj on July 4, 2000 Mail this to a friend!
How much can a receiver stand before getting damage during SO2R contesting ?
=> same band ?
=> different bands ?
RE: SO2R Reply
by K5ZD on July 4, 2000 Mail this to a friend!
There is an engineering answer to this question, but it requires solving a lot of unknown variables. Here is my answer from experience:

With about 40 meters of spacing between antennas, I have had no problem transmitting 1KW while listening to the same frequency from a second radio.

The guys who have both antennas on the same tower, have a lot of problems with this and really can't put both radios on the same band without the danger of burning out the front end of one.
RE: SO2R Reply
by W4AN on July 7, 2000 Mail this to a friend!
Boy I would be afraid to listen on the same band while transmitting. My radios are too dear to me to do that. I'de probably try it with a Drake R4C though.


Bill, W4AN
RE: SO2R Reply
by k2ua on July 17, 2000 Mail this to a friend!
A lot of commercial radios are rated at an absolute maximum signal strength of +10 dBm, or 10 mW, but most ham gear doesn't have such a specification. When the ARRL Lab tests radios, they never exceed +20 dBm (100 mW) to be sure they don't damage radios. In my station, I measured the levels on each antenna while transmitting on each of the other antennas using a calibrated wattmeter (HP 432A) and a calibrated 30-dB attenuator. I was pretty shocked at what I found without filters or stubs--some of the levels were in watts! I solved this by using stubs on all of my single-band feed lines and Dunestar 600 switched band-pass filters on each of the two radios. Even if you're not on the same band, you stand to damage your radios without sufficient isolation. The band-pass filters and attenuator circuits come before the front end, and they are just as susceptible to damage as the front end itself. (How many TS-930s and TS-940s are there out there with blown attenuators?) So the bottom line is, you can damage your rig with too much power even if you're not on the same band.

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