[Elecraft] K-3: Unswitched Rx Ant

[Wayne Burdick]

Dick,

The RX ANT IN jack is electrically isolated from the rest of the  
circuitry during transmit via a pair of PIN diodes. If the signal  
level is high, an associated COR (carrier-operated relay) is also  
kicked in. So what you're experiencing is not normal.

However, we do advise keeping RX-only antennas as far from high-power  
transmit antennas as possible so that the COR will not activate during  
transmit. This minimizes risk of damage to the PIN diodes.

If you continue to have such an issue, please contact k3support for  
other suggestions and possible troubleshooting information.

73,
Wayne
N6KR

On Jan 24, 2011, at 10:18 PM, RLVZ at aol.com wrote:

> Hi Guys,
>
> Please correct me if I'm wrong, but I believe the K-3 Receive  
> Antenna is
> unswitched during tranmit... which allows high RF to get back into the
> receiver.  That's sure the case when using my beverage for receive  
> and transmitting
> on 160-meters.  (sounds like my K-3 is going to blow up)  I'm  
> wondering why
> this is the case.  Couldn't an inexpensive relay be added to the  
> KXV3 to
> prevent his problem?
>
> I'd appreciate knowing what others are doing to prevent your K-3's  
> from
> blowing up while using  beverages on 160-meters!  Is everyone  
> building an
> external relay box just to switch the beverage off during transmit?
>
> Thanks & 73,
>
> Dick- K9OM
>
>
>
>
>
>
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