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

[rocketnj at gmail.com]

Hi Wayne,

Can future KPA1500 firmware allow the smaller bins to be utilized via
standard CAT protocol over TCP/IP? I can feed the amp exact frequency info
via a Node Red Raspberry Pi. Right now using CAT over the KXUSB cable. 
Also it would be desirable to have CAT take priority over internal frequency
counter on the amp. I've had the internal counter fail and the amp was in
never never land when trying to transmit.

I do have to say that after all the mods were done (current to when I sent
in the RF deck) the amp has worked flawlessly. Many thousands of QSOs.  
Any way to track if there are additional mods to the amp that have been
incorporated since last serviced? I would think if there were something
major that existing owners would be notified.


73
Dave wo2x



-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of Wayne Burdick
Sent: Monday, July 20, 2020 12:26 AM
To: Andy Durbin <a.durbin at msn.com>
Cc: Elecraft Reflector <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] KPA1500 with K4 tracks VFOs with 1 kHz resolution

Andy (K3WYC) wrote:

> I still don't see the advantage of AUX bus giving the KPA1500 the TX
frequency to 1 kHz resolution.   What am I missing?


Hi Andy,

The improved resolution ensures that the correct bin is detected when you
get within +/- 1 kHz of the target ATU LC data bin rather than +/- 8 kHz.
This improves repeatability of selected LC values vs. VFO frequency,
especially on 160 and 80 meters where it's most likely to matter.

This also means that, in the future, we could use smaller bin width on some
bands if desired. This could be helpful if you were using the ATU to
fine-tune a very narrowband antenna such as a loop or electrically short
vertical.

73,
Wayne
N6KR


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