Frank,
This looks like the problem I had with my KPA500 that turned out to be a
fault in the T/R switch. My troubles also started on 7MHz.
There's a modkit for that: E850607. I installed it myself.
This has been in the reflector before. Look e.g. for the thread on
KPA500 troubles of last October.
73
Arie
Op 5-11-2015 om 22:48 schreef n...@comcast.net:
Can someone advise me on the following?
My KPA500 (S/N 2663) Amplifier stopped working in the middle of a CW
QSO on 7MHz.
It has been working flawlessly for the past two months (since new).
At the time:
Driver is a K3 running 20w and KPA500 running 400 watts.
Antenna tuner is a KAT500.
Antenna is a GAP Challenger.
Frequency was 7.07 MHz.
While transmitting, the SWR on the KPA500 went high and a Fault flashed.
The KPA500 seemed to reset its self and I continued sending.
The sequence repeated a few seconds later except that the KPA500 had
no output power.
Further testing resulted in the following findings:
Reloaded the firmware.
K3, KPA500 and KAT500 was connected in accordance with Figure 1, Page
5, of the Owners manual.
For the following tests, the output of the KPA500 was connected
directly to the SWR meter and the SWR meter was connected directly to
the dummy load eliminating the KAT500.
Frequency: 3.57 MHz, All works well.
Frequency: 7.07MHz, K3: (ON) 100w, KPA500: (Standby), SWR on KPA500:
1, SWR on SWR meter between KAT500 and dummy load: 1.1:1
K3 power reduced to 10w, Switch the KPA500 to Operate, KPA500 no
lights indicating SWR or Power. K3: SWR and RF indicators jumping up
and down. Raspy tone heard in station monitor (TS-850). The LCD
shows: "7.0 MHZ" no matter which switch around the display I push or
how many times I push them or how long I hold the switch.
Frequency 14.07 MHz, All works well.
The KPA500 (kit) is under warranty, anyone know what s going on here?
Did I do something wrong? Is it time to send it back to Elecraft?
Frank
N7FN
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