K3 V3.03 Two band receive question

[Joel R. Hallas]

The ability to have the sub receiver on a different band is great, but I am
having some problems getting it to do one thing that I had hoped it could
do.

A big plus would be to be able to communicate on one band, using the VFO B
for transmit and the sub-receiver for receive, and then use the main
receiver IF output to view a second band on the IF connected panadapter.
Since there seems to be no way to get to the sub receiver IF. (?)

The only way that I can seem to get the K3 to transmit on the VFO B
frequency is in split mode. If I'm in split mode and change the bands on VFO
A, it drops out of split and transmit goes back to VFO A. If I try to go to
split mode while on different bands, it says "split N/A."

I have found a way to do it. If I start up with VFO A and B on the same band
with the sub rcvr on, I can engage split mode and then manually spin the VFO
A dial until I get to the second band. Even with course tuning, this takes a
lot of spinning.

Am I missing something here??

Regards, Joel
Joel R. Hallas, W1ZR


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[Doug Faunt N6TQS [phone]]

   Date: Wed, 18 Mar 2009 17:17:32 -0400
   From: "Joel R. Hallas" <[hidden email]>

   A big plus would be to be able to communicate on one band, using the VFO B
   for transmit and the sub-receiver for receive, and then use the main
   receiver IF output to view a second band on the IF connected panadapter.
   Since there seems to be no way to get to the sub receiver IF. (?)

You can add an IF output for the second RX.  Below is a quote from an
earlier message about this.  And Wayne told me there is a TMP
connector on the subRX board for an IF out, although Elecraft has no
current plans to provide such.  You could get a spare cable from them
to hack up for the purpose, though.

73, doug

-quote from earlier message-

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
------- End of forwarded message -------


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[wayne burdick]

Hi Joel,

You can only use VFO B for transmit when you're in split mode, at
present. You found a clever work-around, but I don't recommend doing it
this way. Be sure to monitor your TX signal if you do; the synth or
filters may not be set up correctly on TX.

As someone else already posted, it is possible to get a buffered I.F.
output from the sub receiver, but this has not been tested by Elecraft.
It'll probably work, based on what I read, and we did provide a
connector for it on the sub RX itself.

73,
Wayne
N6KR

Joel R. Hallas wrote:

> A big plus would be to be able to communicate on one band, using the
> VFO B
> for transmit and the sub-receiver for receive,... and then use the main
> receiver IF output to view a second band on the IF connected
> panadapter.
> Since there seems to be no way to get to the sub receiver IF. (?)
>
> The only way that I can seem to get the K3 to transmit on the VFO B
> frequency is in split mode. If I'm in split mode and change the bands
> on VFO
> A, it drops out of split and transmit goes back to VFO A. If I try to
> go to
> split mode while on different bands, it says "split N/A."
>
> I have found a way to do it. If I start up with VFO A and B on the
> same band
> with the sub rcvr on, I can engage split mode and then manually spin
> the VFO
> A dial until I get to the second band. Even with course tuning, this
> takes a
> lot of spinning.
>
> Am I missing something here??
>
> Regards, Joel
> Joel R. Hallas, W1ZR
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>

---

http://www.elecraft.com

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