[Elecraft] K3 Sub-receiver use

[hb9ari]

Hi Guy,

It's that way i was thinking to use the P3!
-1- ALWAYS on the sub-receiver output.
-2- ALWAYS on a separated antenna.

My idea was to externally switch the 6m
(or internally if possible?) antenna from
K3 sub-rcvr to main RF when some activity
was "detected" on th P3. When "working"
on 6m, no necessity, (always speaking
for me..) to "monitor" a 10 to 20m band!

In my case, as i'm very space limited,
no room for a 2nd 10 to 20m separated
antenna for diversity...
But a separated 6m antenna is feasible.
(for the moment, i use only a vertical for
6m, no DX, but not too bads QSO)


73,

Rudolf, HB9ARI

Guy Olinger K2AV wrote:
> The trick involved in that switch is a very high isolation between the
> two IF's (RXA and RXB) currently very nicely highly isolated.  If that
> is degraded, then one starts hearing in one receiver the contents of
> the other. Not at all a trivial modification, as high isolation
> switches are not cheap.  So I suspect dynamically selecting display on
> one RX or the other has a big price tag to it. And perhaps has an
> internal space price to it.
>
> I would think, however, that when installing a sub-RX, that perhaps it
> could be cabled and the K3 options set to use the sub-RX on the P3 all
> the time, WITHOUT opening the pandora's box of high-isolation
> switching of RX IF's. This would be in the same vein as choosing the
> RX paths when installing the sub-RX to start with.  Without the time
> to think that through carefully, I'd currently chose that were it
> available.
>
> 73, Guy.
>
> On Wed, May 26, 2010 at 12:29 PM, Radio Amateur N5GE <n5ge at n5ge.com> wrote:
>   
>> On Tue, 25 May 2010 21:25:15 -0700, Alan Bloom <alan at elecraft.com>
>> wrote:
>>
>> Ouch!
>>
>> Does this mean that the P3 will not display the frequency of or the
>> signals seen by the KRX3?
>>
>> If that is true, it is a show stopper for me.
>>
>> TOM, N5GE BT 73 ES GUD LUK
>> AR DE N5GE SK
>>
>> http://www.n5ge.com
>>
>>     
>>> Yes, the P3 assumes it is connected to the main receiver's IF output, so
>>> if it is actually connected to the sub-RX it would still work but would
>>> not display the correct frequencies and levels.  If this becomes popular
>>> enough maybe we should think about adding sub-RX support to P3 firmware.
>>>
>>> Alan N1AL
>>>
>>>       
>> [snip]
>>
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