A year or so ago I embarked on a project to determine the efficiency and
the "sweet spot" operating parameters of my KPA500. I drive my KPA500
with my Elecraft K3S.
Armed with a good 50 ohm dummy load, two watt meters {one on the input
and one on the output}, and my EXCEL spreadsheet, I
Have you tried to reload the firmware? Sounds as though a bit or two
is out of place. Use the KPA500 Utility to accomplish this.
73
Bob, K4TAX
On 1/7/2020 5:26 AM, Ken Winterling wrote:
Ken,
I have the same amp but have not experienced the problem you describe.
When issues like this
Ken,
I have the same amp but have not experienced the problem you describe.
When issues like this occur it is best to isolate the suspect device to
minimize the variables.
Before doing anything have you tried turning off the power switch on the
rear of the amp? Wait 10 seconds then turn the
Hi guys
While I'm waiting for Elecraft support to come forward with a suggestion, I
thought I'd share my KPA500 (sn 0212) Amp's fault to see if it rings any new
year bells with anyone...hi
Just be4 Xmas I started getting an occasional fault whereby the Standby switch
would lock up, then after a
Robert,
It is possible that the fault is brief enough to register in the fault
table, but not turn off the amp.
The 65 to 85 volt range is to be determined with the amplifier turned
on, but not keyed and certainly not running at 500 watts.
Do as the manual indicates and measure you AC
My KPA500 was purchased new in July 2017. Use regular 120V outlet.
I run the red transformer tap to keep my transmit HV above 60 at full 500
output.
The yellow tap did not provide sufficient voltage on transmit. Thus the
red.
I have a whole-house surge protector just outside my main breaker box.
Arcing. Try reducing power and see if the faults go away. Raise the power
gradually from low and see when the faults appear. Where faults occur and
why is another subject.
73, Guy K2AV
On Thursday, May 28, 2015, w4grj w4...@satterfield.org wrote:
My KPA500 has recently started to switch from
My KPA500 has recently started to switch from operate to standby while using
on voice LSB on 40 meters
KAT500 tunes to 1.38 SWR, the bypass SWR is 3.1
This now happening on several occasions...any suggestions appreciated.
Jack
W4GRJ
I just found out that there's a Rework Kit E850607 for the KPA500. It
replaces Q5 (a FET) with a Darlington Transistor. The kit also includes a
Zener Diode, resistors and capacitors and includes changes to the 12 meter
LP filter. The kit applies to board REV D9 or earlier.
-
Jack WA9FVP
Of Wayne
Burdick
Sent: Saturday, November 01, 2014 9:54 PM
To: wa9fvp
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 fault at H44KW (no pwr high SWR)
Sure, as long as the pinouts are the same, and the voltage and current
ratings meet your switching requirements.
73,
Wayne
N6KR
On Nov 1
Hi fred,
The parameter is Rds(on),max The IRFSL9N60A is .75 ohms at 9.2 amps and the
IPA50R399CP is .399 ohms at 9 amps. Q4 and Q5 are in series with a 100 ohm
resistor and the diode so the difference in the R DS(on),max has little
effect.
Jack WA9FVP
Willco Electronics
-
Jack WA9FVP
Here's a funny story. Last week I ordered a KPA500. Two days later a nearby
Ham dropped off his KPA500 that failed. His K3 was showing high SWR with no
power. He purchased his a year ago and didn't want to pay the expense of
shipping it back to the factory.
I found a defective Q5 (see the TR
Sure, as long as the pinouts are the same, and the voltage and current ratings
meet your switching requirements.
73,
Wayne
N6KR
On Nov 1, 2014, at 9:16 PM, wa9fvp rep...@willcoele.com wrote:
Here's a funny story. Last week I ordered a KPA500. Two days later a nearby
Ham dropped off his
I wonder if anyone on this reflector could offer advice to the current
H44KW DXpedition. They have 2 new KPA500's with them. One has gone down
the first day. The fault is The linear is not putting any power out what so
ever. The SWR is very high when you switch the amp from Standby to Operate.
Neil,
Please contact Elecraft Customer Support at K3support 'at' elecraft.com. We
can help out the DXpedition assessment efforts and help determine possible
remedy options.
Cheers,
David/KG6IRW
Elecraft Customer Support
--
View this message in context:
Check the wires between the ANTENNA connector and the low pass filter board.
Bob, N6CM
On Wed, Feb 20, 2013 at 8:08 AM, David Shoaf david.m.sh...@gmail.comwrote:
Neil,
Please contact Elecraft Customer Support at K3support 'at' elecraft.com.
We
can help out the DXpedition assessment
Hi Neil,
let them check if the connection wires between PA board and output connector
are still in place! I had that failure once, too. The plugin-connection is not
as strong as it could be ...
73, Olli - DH8BQA
Neil G0JHC g0...@blueyonder.co.uk hat am 20. Februar 2013 um 16:05
I am enjoying my new KPA500 coupled with my K3, and I have set up the K3 to
transmit at approximately 25 watts in the operate position on all bands
except 30 meters. However, if the amplifier menu is set to default to operate
mode upon KPA500 initialization, I experience an immediate
Hi Len
My KPA500 is normally set to PWR ON = STBY, which is the factory default
setting.
But after setting it to OPER for a test, I noticed the same thing.
I suspect this is a timing issue, just like leaving the K3 at low power on
band change if BAND CHG is set to STBY.
The next FW release is
:07 AM
Subject: Re: [Elecraft] KPA500 fault
Hi Len
My KPA500 is normally set to PWR ON = STBY, which is the factory default
setting.
But after setting it to OPER for a test, I noticed the same thing.
I suspect this is a timing issue, just like leaving the K3 at low power on
band change
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