[Elecraft] Antenna question

[Bill Turner]

ORIGINAL MESSAGE:          (may be snipped)

On 2/11/2014 3:36 PM, George Thornton wrote:
> I have a dual receive K3.  If I have both receivers going, one on each channel, and I broadcast on one of these antennas, am I in any danger of overloading and frying the other receiver?

REPLY:

The field around an antenna is very strong compared to the input of a 
receiver which is expecting a fraction of a microwatt. Not something to 
be messed with.

If you must do this I would recommend installing a relay to short out 
the non-transmitting antenna, and you should sequence it so it closes a 
few milliseconds before beginning TX and opens a few milliseconds after 
ceasing TX. Even better than simple shorting, use an SPDT relay so that 
when the relay activated, the antenna is disconnected and the receiver 
input is shorted to ground, separate from the antenna. This provides 
even more isolation between the two.



73, Bill W6WRT