Seems like an issue with the "BCD" data from the K3 to the KPA500, but
the symptoms don't seem to point to a single broken wire.
It may be an obscure firmware bug. What happens if you take 30m back
out of the band-map? Is the K3 firmware up-to-date?
73,
~iain / N6ML
On Sun, Aug 7, 2016 at 3:42 PM, Dauer, Edward <[email protected]> wrote:
> Thanks, Cliff. I am aware of the 30M 200W power limitation, but I don’t see
> why adding 30M to the K3’s Band Map would cause 40 meters and 10 meters to be
> in error. When the K3 is at 7.0 MHz the KPA500 switches to 3.5. When the K3
> is at 28.0 MHz the KPA500 switches to 24.9. That never happened before
> today. Moreover the amp correctly senses 30M on the first dit and switches
> correctly, and seems very happy producing 200W or more on 30M.
>
> Brian, K3KO, suggested disconnecting the cable from the amp to see what the
> band buttons on the amp do. They work correctly with the cable disconnected,
> and they work correctly with the cable connected and the K3’s power off. 7.0
> switches to 7.0, 28 switches to 28, and so forth. So what does that mean –
> that the fault lies in the K3? But before adding 30M to the Band map in the
> K3 changing bands worked for all of 80, 40, 20, 15, and 10 – that is,
> changing the K3 band changed the KPA500 band correctly. Now it doesn’t work
> for 40 and 10, and 30; but it does for 80, 20 and 15. Since the only change
> that occurred was adding 30M to the band map, does that mean something is
> fouled up in the configuration? I did recycle the power to both the K3 and
> the KPA500 after making the configuration change.
>
> One other fact – pressing the 10MHz band button on the KPA500 correctly
> switches the K3 to 10MHz – but places the amp on 5.3 MHz. The amp then
> switches to 10 MHz with the first transmitted dit. But pressing the 10MHz
> band button on the amp when the K3 power is off changes the amp to 10 MHz.
>
> Appreciative and still perplexed, Ted, KN1CBR
>
>
> Edward A. Dauer, LL.B. M.P.H.
> Dean Emeritus and Professor Emeritus of Law
> University of Denver
>
>
> On 8/7/16, 4:19 PM, "Cliff Frescura" <[email protected]> wrote:
>
> "But the KPA doesn’t track the K3’s band choice correctly."
>
> ...it's by design.
>
> In the US the maximum power on 30m is 200W PEP.
>
> http://www.arrl.org/frequency-allocations
>
> 73,
>
> Cliff K3LL/6
>
> -----Original Message-----
> From: Elecraft [mailto:[email protected]] On Behalf Of
> Dauer, Edward
> Sent: Sunday, August 07, 2016 2:50 PM
> To: [email protected]
> Subject: [Elecraft] KPA500 Band Tracking
>
> I must have done something I didn’t mean to do.
>
> Just put up a 30 meter antenna today. It works fine. Until today I had
> the K3 band map set to include only 80-40-20-15-10. The KPA500 tracked it
> automatically perfectly. I then went into the config menu for band map and
> set 30 meters to IN. The K3 works perfectly – band switching gives me, in
> MHz, 3.5 – 7.0 – 10.1 – 14.0 – 21.0 – 28.0 and then cycles back to 3.5 That
> is also exactly what I expected.
>
> But the KPA doesn’t track the K3’s band choice correctly. For 80 I get
> 80. For 40 on the K3 I get 80 on the KPA500. For 30 on the K3 I get 5.3MHz
> on the KPA500. For 20 I get 20. For 15 I get 15. And for 10 on the K3 I
> get 24.9 MHz on the KPA500.
>
> Interestingly, the “Band” buttons on the KPA500 have the same errors. In
> MHz, pressing 1.8 yields 5.3. 3.5 is OK. Pressing 7.0 produces 3.5. 14 and
> 21 are OK. And pressing 28 produces 24.9.
>
> The frequency sampling, however, works perfectly. A single dit on any
> band switches the KPA500 to the correct band, as defined by the K3.
>
> The cables are all Elecraft issue. They are all connected correctly –
> witness that everything worked perfectly, on every band, until I added 30M
> into the K3’s band map. Because both the K3 auto tracking feature and the
> Band buttons on the KPA500 yield the same errors, I think I must have messed
> up something in the amp.
>
> I have, by the way, already RdTFM.
>
> Any ideas about what I might have done? Equally useful would be, how do
> I undo it?
>
> Many thanks for whatever anyone can suggest . . .
>
> Ted, KN1CBR
>
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