[Elecraft] KPA1500 with K4 tracks VFOs with 1 kHz resolution

[Dick Dievendorff]

That’s not at all what it means.  K4 interfaces via AUXBUS with KPA500 and KAT500 as a K3.

73 de Dick, K6KR

> On Jul 19, 2020, at 19:35, AL7CR <al7cr at mooseaviation.com> wrote:
> 
> Can you please confirm this means, at present, that the K4 does NOT interface with the KPA 500 and KTA 500 via the Auxbus.  If so, that is a major disappointment.  I presume operation is still possible in the frequency sensing mode as it is with non Elecraft amps.  Just writing that last sentence makes me sad.  
> 
> I would have thought the K4 would have shipped with a K3 compatibility mode.  Surely I am not the only one considering replacing my K3 with a K4 and expecting not to lose capability.  It is also a bit sad that, if I understand correctly, you only HOPE to add compatibility in the near future.  There must be more KPA/KTA 500 out there than KPA 1500 by a huge margin.
> 
> AL7CR
> 
> 
> 
>> On Sun, Jul 19, 2020, at 1:52 PM, Wayne Burdick wrote:
>> Those using a K4 transceiver with our KPA1500 amp will have the 
>> advantage of +/- 1 kHz resolution in VFO tracking. In many stations, 
>> this finer resolution will result in lower SWR and improved amplifier 
>> performance, especially on the lower bands. (The original resolution 
>> was +/- 8 kHz.)
>> 
>> This is part an overall upgrade of our Auxbus control interface, taking 
>> advantage of the additional processing resources available in the K4. 
>> The revised protocol allows for more robust RFI rejection, as well as 
>> future enhancements to amp/tuner control. 
>> 
>> At present only the KPA1500 supports radio type K4, but we hope to add 
>> this capability to the KPA500 and KAT500 in the near future.
>> 
>> All amps and tuners will continue to support the original Auxbus 
>> protocol, remaining 100% compatible with our existing transceivers.
>> 
>> 73,
>> Wayne
>> N6KR
>> 
>> 
>> 
>> 
>> 
>> 
>> 
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