[Elecraft] KPA 100 Low power out 15/12/10

[Gregg Marco]

I am experiencing a low power output condition on the KPA100 on 15-10
meters. Power out on all other bands >100 watts.

Output/current draw from K2 measured at the BNC connector with the KPA100
disconnected: (PO28 set to 15w)
15 14w 2.9a
12 11w 2.5a
10 10w 2.5a

KPA 100 output
15 96w 20a
12 88w 17a
10 85w 20a

All component values in the LP filters on both the K2 and KPA100 have been
verified. SWR on the KPA100 LPFs is ok.

At this point I am suspecting soft PA transistors in the KPA 100.

Any feedback is greatly appreciated

73
Gregg


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Sverre Holm
Sent: Saturday, December 31, 2005 9:54 AM
To: 'Bob G3PJT'; elecraft at mailman.qth.net
Subject: RE: [Elecraft] KSB2 misbehaving


> -----Original Message-----
> Got a funny one - KSB2 chip/module seems to be recognised via
> the Auxbus but doesn't seem to be doing anything when I
> change the settings with the SSbA and SSbC commands.
>

If you measure the voltage on pin 11 of the KDSB2 processor (U1) you can see
if it toggles with the SSBA command, and the same with pins 23, 24, 25 for
SSBC. That should give you a clue whether the processor responds to the
commands or not.


73

Sverre
LA3ZA
http://www.qslnet.de/la3za/


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