Good Evening,
Conditions were not very good. Noise on both bands. Forty meters
had summer storms with some QRM. I may need to move that net down a
little. I am also tempted to move it later for a few months.
Weather reports ranged from hot and muggy, to hot and dry, to just
plain ho
"If you check the schematics, the 270V is made/comes from the power
supply...BUT the 60V enable relay (feeds the voltage divider and read on the
front panel) is on the PA board... "
May I suggest that you look at KPA Power Supply Schematic sheet 1 of 2 and
locate relay K1 (60 V Enable) which is
If you check the schematics, the 270V is made/comes from the power supply...
BUT the 60V enable relay (feeds the voltage divider and read on the front
panel) is on the PA board...
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Andy Durbin
Sent: Sunday, July 17, 20
"I think it may actually be the other way around... The 60V relay does not
close if 270V is missing?"
Assume 60 V Enable relay K1 is not closed. How would 270 V be produced? The
secondary winding of T1 is open circuit.
Andy, k3wyc
__
I think it may actually be the other way around... The 60V relay does not
close if 270V is missing?
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Andy Durbin
Sent: Sunday, July 17, 2022 6:49 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA500 / 270V ERR
HV
HV and 270V are separate power supply rails but, if my read of the schematic is
correct, 270 V depends on 60 V being present. 60 V requires the interlock
switch to be closed.
Diagnosing this may require having the top off and the interlock defeated.
Everyone should evaluate their own competen
Couldn't agree more. Due to a change in living arrangements I am down to a
KX3/100 and a K2/100. From a technical and portability point of view the
KX3 has the edge. But the K2 just sounds more like, and its innards (which
I assembled) just look more like, what a radio was when I became captivat
James I had the 270 V Err message on my KPA500 as well, S/N 3406. It turned
out to be R16 on the PS board had opened (S/B 100 ohms). This resistor
feeds the voltage multiplier circuit to get to 270V. Don't know if this is
your problem or not but does not hurt to check. It is an SMD resistor and I
t
Hi - I’ve had my KPA500 serial number 3645 for several years and until today
have had zero problems with it. Previously it was driven by a K3; currently
(until today!) a K4D. Last time I used it, it worked great. Today I powered it
on after having it off for several days and when I went to Opera
Hello Andy
The main reason I abandoned small transmitting loops was their susceptibility
to temperature variation, one cause being power input, the other due to
instantaneous change when the sun comes out.
Apologies for sliding off topic.
David G3UNA
> On 17/07/2022 16:38 Andy Durbin wr
Don't need to have ferrite in the antenna system to see this sort of SWR
"runaway". I have the same problem with my home brew small transmitting loop
if I run over 100 W.
Spent some time trying to figure out what was heating and causing the loop's
resonant frequency to shift. My preliminary a
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