[Elecraft] KPA1500

[Rick Bates, NK7I]

Presuming that is a known 'good' dummy load for that power level, have 
you run the output calibration of the driver radio (K3/S also presumed) 
as a starting point?

If that has been done (successfully, multiple times), check to make SURE 
that the radio (driver) antenna tuner is BYPASSED (not presenting an odd 
load into the amp).

Watch CAREFULLY that the driver output is constant (no dirty control, no 
spike etc.).

Then it's time to be concerned about the 80M tuned input circuit failing 
on the KPA1500 and call Elecraft for specific tests.  When the amp sees 
 >=19 watts input, it wigs out, badly.  (But the extreme outputs ARE 
impressive; it's nice to have overhead at legal limit).

GL, please let us know how it was resolved,
Rick NK7I


On 2/19/2020 9:10 PM, Ed gilliland wrote:
> Hello Everyone,
>
> I'm getting the following error codes on 80 meters, 160 and 40 are 
> working.
>
> I suspected the 80m antenna so I tried using a dummy load and I get 
> the same error codes.  Reducing the input power does not help.
>
> I've reloaded firmware 2.38.
>
> Anyone run into this problem?
>
> Ed W5TM
>
>
> 918 20-02-19T23:00:11 OVR 61 - LOW GAIN  freq 3544 inp 10W 36A 21C adc 
> 222 power ratio 0
> 917 20-02-19T22:59:55 OVR 61 - LOW GAIN  freq 3544 inp 14W 43A 21C adc 
> 275 power ratio 0
> 916 20-02-19T22:59:31 FLT B0 - PWR DISS  freq 3544 inp 14W 44A 20C pwr 
> dissipated 2313W
> 915 20-02-19T22:59:31 OVR 61 - LOW GAIN  freq 3536 inp 14W 43A 20C adc 
> 274 power ratio 0
> 914 20-02-19T22:58:40 FLT B0 - PWR DISS  freq 3536 inp 19W 51A 20C pwr 
> dissipated 2676W
> 913 20-02-19T22:58:40 OVR 61 - LOW GAIN  freq 3536 inp 19W 51A 20C adc 
> 330 power ratio 0
> 912 20-02-19T22:55:01 ON  00 - ON  3 times firmware version 02.38
> 911 20-02-19T22:39:38 FLT 61 - LOW GAIN  freq 3536 inp 10W 36A 23C adc 
> 223 power ratio 0
> 910 20-02-19T22:39:38 OVR 61 - LOW GAIN  freq 3544 inp 10W 36A 23C adc 
> 222
> 918 20-02-19T23:00:11 OVR 61 - LOW GAIN  freq 3544 inp 10W 36A 21C adc 
> 222 power ratio 0
> 917 20-02-19T22:59:55 OVR 61 - LOW GAIN  freq 3544 inp 14W 43A 21C adc 
> 275 power ratio 0
> 916 20-02-19T22:59:31 FLT B0 - PWR DISS  freq 3544 inp 14W 44A 20C pwr 
> dissipated 2313W
> 915 20-02-19T22:59:31 OVR 61 - LOW GAIN  freq 3536 inp 14W 43A 20C adc 
> 274 power ratio 0
> 914 20-02-19T22:58:40 FLT B0 - PWR DISS  freq 3536 inp 19W 51A 20C pwr 
> dissipated 2676W
> 913 20-02-19T22:58:40 OVR 61 - LOW GAIN  freq 3536 inp 19W 51A 20C adc 
> 330 power ratio 0
> 912 20-02-19T22:55:01 ON  00 - ON  3 times firmware version 02.38
> 911 20-02-19T22:39:38 FLT 61 - LOW GAIN  freq 3536 inp 10W 36A 23C adc 
> 223 power ratio 0
> 910 20-02-19T22:39:38 OVR 61 - LOW GAIN  freq 3544 inp 10W 36A 23C adc 
> 222
>
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