[Elecraft] K3S with an external receiver

[Joe Subich, W4TV]

On 8/24/2017 12:25 AM, Don Wilhelm wrote:
> The other way (more simplistic) is to connect the other receiver to
> the K3S RX ANT OUT jack. That allows the external receiver to listen
> on the same band or a lower band than the K3S is tuned to.
One should still use a splitter when connecting an external receiver
to the K3/K3S R ANT OUT jack.  The input of the splitter is connected
to RX ANT OUT, one output to RX ANT IN, the other to the second RX
and the RX ANT switch activated.

Without a splitter it is possible that the various bandpass filters
(K3 vs. external RS) and/or basic input impedance can cause one RX
or the other to "hog" the input signal level ("suck out") making the
other RX "deaf".  A splitter will resolve this issue at the cost of
3 to 4 dB of signal level (3 dB is unavoidable even with a perfect
split).

73,

    ... Joe, W4TV


On 8/24/2017 12:25 AM, Don Wilhelm wrote:
> Jeff,
> 
> The only way to do that properly is to use a 3dB splitter external to 
> the K3S and the 590SG.
> Of course, that is only for receive.  On transmit, the 3dB splitter 
> would have to be removed and the input to the 2nd receiver protected.
> 
> The K3S does that internally with the addition of the SubRX, and it is 
> done automatically if the SubRX is sharing the antenna with the main RX. 
>   You would have to provide the same switching externally to use an 
> external receiver.
> 
> The other way (more simplistic) is to connect the other receiver to the 
> K3S RX ANT OUT jack.  That allows the external receiver to listen on the 
> same band or a lower band than the K3S is tuned to.  Signals on a higher 
> band than the K3S is tuned to will be attenuated because the K3S Low 
> Pass Filters are ahead of the other receiver.
> 
> 73,
> Don W3FPR
> 
> On 8/24/2017 12:00 AM, JEAN-FRANCOIS wrote:
>> Hi,
>>
>> Is there anybody ever use an external receiver with a K3S as a second 
>> receiver… to act as a second receiver that can share the same antenna 
>> the K3S use or similar setup???
>>
>> The reason here is I still a have my Kenwood 590SG that I could enable 
>> TX Inhibit for safety, and use it as a second receiver only. It’s an 
>> excellent backup radio. I wondering if I could enhance my setup if 
>> possible by using spare gears.
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