Topband: Post contest season: TX antenna vs RX antenna cros-stalk. What do you do?

william radice k4owr at
Tue Mar 22 09:05:11 EDT 2016

:::: Serious multi-op contest stations face this issue all the time. 
Most use individual band filters and they almost completely eliminate 
the issue.
At our station we used the Dunestar filters for operating positions on 
different bands. As for 160 I personally use the KD9SV "front end saver" 
and it does the job completely.

On 3/22/2016 5:44 AM, Mark van Wijk wrote:
> Now that we are  'sort of in post contest season mode' and sharing some good
> ideas, there is another question:
> During recent Field-day setups I noticed severe cross-talk issues between TX
> antennas and the separate RX antenna circuits.
> For sure any TX/R relay circuitry offers roughly 50-65 dB dampening. So, during
> a contest with >S9+30 signals received on the large TX antennas (Deltaloop for
> 40m and 80m) these would still show up S1 - S4 on the FD station's K3 RX input.
> At home I normally de-tune my backyard TX antenna(switch to GND during RX) to
> avoid noise pickup at the RX antennas, so I never noticed this.
> Question 1: how do you manage the TX-RX cross-talk at your setup?
> - switch TX antenna to GND during RX
> - switch-in en external attenuator, so the cross-talk is below noise level, but
> you are still able to use the TX antenna during RX
> - any other solution?
> Question 2: is there any other basic circuitry or setup in a basic contest
> station which offer possible similar negative side effects?
> 73, Mark PA5MW
> _________________
> Topband Reflector Archives -

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