[Elecraft] IF output from Sub RX? Re: K3 KRX3 B SET and FREQ ENT

[Iain MacDonnell - N6ML]

Doug Faunt N6TQS +1-510-655-8604 wrote:
> Since we're on the subject of the sub RX, what would it take to get IF
> out from the sub RX in addition to from the main RX?

W3SZ posted about that in the LP-Pan group:

http://groups.yahoo.com/group/LP-PAN/message/2332

(don't know if you have to be a member of the group to read that)

Basically:

>> >> This is a brief summary of what I did with the KRX3:
>> >>
>> >> I used the Z10000 as buffer amp inside the KRX3.
>> >>
>> >> I got +12V from a 12SA pad near to P86A.
>> >> Power and RF connections to the Z10000 were done from the underside of
>> >> the Z10000.
>> >>
>> >> I took IF output from KRX3 from P86A and used RG174U to take this to
>> >> input of Z10000.
>> >>
>> >> I mounted Z10000 on an unused FL position using a 1/2 inch standoff.
>> >>
>> >> I mounted a dual female SMA connector in the REF hole at the bottom
>> >> corner of the K3 just below the official IF out BNC. I then used a
>> >> right angle premade small surplus coaxial cable to take the signal to
>> >> the KRX3 and thus the Z10000.
>> >>
>> >> I entered the KRX3 at the back left corner opposite to J92, because
>> >> there was already an opening there.
>> >>
>> >> I ran the coax inside the KRX3 bottom shell, beneath the main KRX3
>> >> PCB. I brought it up to the Z10000 by running it through an unused
>> >> hole meant for an FL standoff.
>> >>
>> >> At first check, using the two subreceivers on the Flex5000 to receive
>> >> the IF signals from the K3, the main K3 and the KRX3 subreceiver IF
>> >> outputs seem to be equivalent.
>> >>
>> >> When constructing the Z10000, I used the -U [Universal] options, not
>> >> the K2 options. I chose to set it up for zero gain, and thus chose
>> >> R907 to be 499 ohms, and R905 to be 4.7K, as per section 2.3.3 of the
>> >> Z10000 manual.


HTH,

     ~Iain / N6ML