Barry,
Hard luck but do not worry, you are not alone! You are the third that
we know of in the UK and there was another in the USA. Let Gary
Surrency at support know. In my case, a scope along the RF chain showed
that there were signal voltage (and estimated current) losses across
the base drive RC network to Q1,2 on the affected bands only. The
problem has been temporarily cured by doubling the size of C80,81 in my
case and Larry's, G0IKE.
Elecraft are investigating and we are awaiting an explanation and cure.
73, Ted G7BQM K2 #4732
On 25 May 2005, at 08:35, Barry Cooper - Relcom wrote:
Hi,
I have completed the final alignment and test of my KPA100 amplifier
which is working well in almost every respect other than relatively
lower power output on the 30m and 20m bands. Measured power output is
as follows:
80m 117W
40m 113W
30m 71W - initially flashes "Hi Cur" message
20m 75W - initially flashes "Hi Cur"
18m 105W
12m 103W
10m 99W
Power output measured at antenna socket across 50 ohm load using Tek
scope and calulating Pwr = Vpp^2/400.
I have checked the inductors and capacitors in the two LPF chains.
Everything appears ok, i.e. correct toroids used wound with correct
number of turns. All capacitors check out as correct value with
correct placement.
CAL CUR set at 3.5 as indicated in setup. Power output displayed on K2
matches calculated output power to within 2-3W. K2 running barefoot
gives more than 10W on all bands.
Help please! Where do I look next?
Barry
G4RKO
K2 - 4703
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