A datapoint on whether or not it is likely to generate 1 or 2 watts of
input to the RX antenna.
A number of contesters had been using ANC-4 noise limiters as preamps
rather than their intended function. The RX antenna was ported through
it and to the receiver. 1/4 watt resistors in the ANC4 input were
cooked. Replacing them with 1 watt units solved the problem. This
foggy data suggests that 1 watt of power to RX antenna input may be
unlikely with something like the below setup.
I was one of these people. The situation is worse on 160M with several
receive antennas much closer than 1/4 wave to the transmit antenna--
worse case 50'. Keep in mind 1/4 wave is about 125'. Running a full
KW to an inverted L.
There are ICE units which limit inputs to something under 1/2 volt. If
you have receive antennas closer than the above, you might consider the
ICE unit. There are other HB limiters people have created over the years.
If you have an oscilloscope or RF voltmeter, terminate the receive
antenna with 50 ohms in the shack and measure the voltage. From that
you can compute power and see where you stand.
73 de Brian/K3KO
wayne burdick wrote:
Charles Harpole wrote:
Can I run power with a good receive antenna connected to
rcve only input bnc socket without damage anywhere?
Yes. We've pumped several watts into the KRX3's aux antenna input
without any sign of damage. (But anything above about 1 to 2 watts
measured at the sub's AUX input will activate the carrier-operated
relay, or COR, which should be avoided because it slows down break-in
keying receive recovery.)
As long as the receive antenna is a reasonable distance from the
transmit antenna, the COR won't be activated, and you'll be at a safe
level. The AUX BNC jack provides somewhat better isolation than the
KAT3 connector, so it may be the better choice if you're not sure if
the antennas are far enough apart at the intended power level.
73,
Wayne
N6KR
---
http://www.elecraft.com
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