[Elecraft] Using external SDR and a K3 as antenna splitter

[Dave Cole]

Many thanks to all who answered!!

I was wondering if there was any sort of filtering on that jack pair... 
Sorry to see that...

I have a minicircuits three way, and will be adding that, alas, the 
filtering will be something to work around...  THANKS for the info Don!!!!

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 11/18/19 8:26 AM, Don Wilhelm wrote:
> Dave,
> 
> There in a block diagram in the back of the K3 manual.
> The RX ANT OUT is what you are looking for - but remember that it has 
> the Low Pass Filter in the path, so the response at frequencies higher 
> than the band the K3 is tuned to will be attenuated.
> 
> If you need a direct antenna connection, you will have to use a splitter 
> on the antenna and some means of protecting the SDR during K3 transmit.
> Alternately, use a separate RX antenna on the SDR (you may still need 
> protection for the SDR unless the TX antenna is located far enough from 
> the RX antenna.
> 
> 73,
> Don W3FPR
> 
> On 11/18/2019 11:06 AM, Dave Cole wrote:
>> A few years ago someone posted a method of using a splitter, and the 
>> External Antenna jacks to feed an external SDR with the direct 
>> antenna, not a IF, but a wideband signal from the primary antenna...
>>
>> I think it was something along the lines of add a splitter, between 
>> the RX Antenna in/out, and then picking off the antenna feed to the 
>> SDR from an output of the splitter...   Does this make sense?
>>
>> Is there a high level block diagram showing the antenna pathing for a 
>> K3, with the ATU installed, and how the front panel switch labeled RX 
>> ANT controls the signal path?
>>