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[K3] funcube on K3 IF output

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graham.wood1

[K3] funcube on K3 IF output

Hi All

I have been trying the Funcube PRO + dongle connected to the IF output on the K3. It works fine, displaying sigs in a 180khz passband centered on 8215 EG setting the FCD to 8215 khz & tuning the K3 to 10100 (A RTTY WX stn) this stn is still visible on the FCD display with the K3 is tuned to 10180 khz. Is there anyway to prevent the frequency changing when tuning on the K3 VFO? I noted this is possible when using a P3, does this use software built into the P3 or does it send commands back to the K3?

Gray G3VIP
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Joe Subich, W4TV-4

Re: [K3] funcube on K3 IF output

> Is there anyway to prevent the frequency changing when tuning on the
> K3 VFO? I noted this is possible when using a P3, does this use
> software built into the P3 or does it send commands back to the K3?

It uses capabilities built into the P3. Specifically, in "fix tune"
mode, the P3 changes its center frequency to compensate for changes
in the K3 VFO frequency.

With the SDR software that implemented a fix tune mode, the FCD+ could
do the same thing. *However* the SDR software would need to know the
the K3's VFO A frequency, mode and IF Offset (IF; and IS; commands),
calculate the IF frequency that corresponded to the desired "fixed
frequency" *and* compensate every time the K3 VFO, mode and/or filter
shift/width changed.

73,

... Joe, W4TV

On 7/6/2016 11:36 AM, [hidden email] wrote:

> Hi All
>
> I have been trying the Funcube PRO + dongle connected to the IF
> output on the K3. It works fine, displaying sigs in a 180khz passband
> centered on 8215 EG setting the FCD to 8215 khz & tuning the K3 to
> 10100 (A RTTY WX stn) this stn is still visible on the FCD display
> with the K3 is tuned to 10180 khz. Is there anyway to prevent the
> frequency changing when tuning on the K3 VFO? I noted this is
> possible when using a P3, does this use software built into the P3 or
> does it send commands back to the K3?
>
> Gray G3VIP

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Help: http://mailman.qth.net/mmfaq.htm
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Alan Bloom

Re: [K3] funcube on K3 IF output

On 07/06/2016 11:22 AM, Joe Subich, W4TV wrote:

>
>> Is there anyway to prevent the frequency changing when tuning on the
>> K3 VFO? I noted this is possible when using a P3, does this use
>> software built into the P3 or does it send commands back to the K3?
>
> It uses capabilities built into the P3. Specifically, in "fix tune"
> mode, the P3 changes its center frequency to compensate for changes
> in the K3 VFO frequency.
>
> With the SDR software that implemented a fix tune mode, the FCD+ could
> do the same thing. *However* the SDR software would need to know the
> the K3's VFO A frequency, mode and IF Offset (IF; and IS; commands),
> calculate the IF frequency that corresponded to the desired "fixed
> frequency" *and* compensate every time the K3 VFO, mode and/or filter
> shift/width changed.

*and* compensate in real time for the latency of the communications
between the P3 and K3. It was a major development effort to get it to
work smoothly.

Alan N1AL

> 73,
>
> ... Joe, W4TV
>
>
> On 7/6/2016 11:36 AM, [hidden email] wrote:
>> Hi All
>>
>> I have been trying the Funcube PRO + dongle connected to the IF
>> output on the K3. It works fine, displaying sigs in a 180khz passband
>> centered on 8215 EG setting the FCD to 8215 khz & tuning the K3 to
>> 10100 (A RTTY WX stn) this stn is still visible on the FCD display
>> with the K3 is tuned to 10180 khz. Is there anyway to prevent the
>> frequency changing when tuning on the K3 VFO? I noted this is
>> possible when using a P3, does this use software built into the P3 or
>> does it send commands back to the K3?
>>
>> Gray G3VIP
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]