[Boatanchors] How much is too much?

[Glenn Little WB4UIV]

In Desert Storm the troops blew up the Harris solid state receivers 
right and left from sand static.
The blowing sand charged the antenna past the point the front end 
could survive.
Many years ago, I lived in Jamaica.
I helped with the 6Y0A operation.
We need a TR switch for the 160M rig.
I was it.
I had to move the antenna from the transmitter to the receiver and back.
The 80M antenna ran parallel to the 160M antenna.
I received a few RF burns from the coupling of the 80M antenna into 
the 160M antenna.

I have seen many 3 MHz front end coils burned up in R-390 series receivers.
They almost always had a 3 MHz transmitter up and receivers tuned to 
other parts of the 3 MHz band.

I have seen a neon tube placed across the antenna lead of receivers, 
possibly a NE-2 to reduce front end burn out from close transmitters.

I would highly recommend that all receiver antenna connections be 
grounded when not in use.

73
Glenn
WB4UIV



At 06:03 PM 1/29/2011, Jack Antonio wrote:
>Subject is concerning power levels into a receiver, not
>prices on eBay.
>
>I am looking at putting up multiple antennas at my QTH, for
>multiple radio setups, and am wondering if RF into one
>antenna may damage a receiver on another antenna.
>
>As a test, I hung an 80 meter inverted vee, with the centers
>   separated by about 10 feet vertically and 3 feet horizontally
>   from the regular station antenna. (these are eyeball measurements).
>
>100 watts into antenna A(+50 dbm) results in +34 dbm from
>antenna B, as measured on a spectrum analyzer. Just slightly
>over 2 watts.
>
>This seems like too much for a receiver to safely handle, but what
>is a safe value?
>
>Thanks
>
>Jack Antonio WA7DIA/4
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