[Lowfer] Receiver protection

[Lee Hiers]

I used to operate at a big 160 station for contests years ago - we ran two
rigs, so one RX always had a Beverage connected to it, even when the other
rig was transmitting (conservatively) at 1.5 kW.  Never a problem.  I would
think as long as you have about 40 dB isolation or better from the TX you
should be OK, and that's why you had no damage.

73 de Lee, AA4GA


On Tue, Jul 10, 2018 at 8:04 AM, N1BUG <paul at n1bug.com> wrote:

> Does anyone have ideas for receiver front end protection at LF and
> MF? I am worried about my TX signal damaging receivers.
>
> Of course the best idea is to disconnect the RX antenna from the
> receiver while transmitting. Any good solution while leaving it
> connected?
>
> Now I have a pair of back to back 1N4148 diodes across the receiver
> front end but I don't think this offers real protection because they
> allow too high voltage before conducting. Also there is a preamp
> after the didoes which can bring the RF to dangerous levels!
> (Somehow nothing was damaged during last winter operating this way... :)
>
> 73,
> Paul N1BUG
>
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