On Wed,11/19/2014 11:45 AM, Joe Subich, W4TV wrote:
Joe made this statement assuming that the KPA500 produced FAR more
distortion than it actually does. A few days later, I showed
measurements with a K3 driving a KPA500 to 500W with PSK31 showing
that the distortion was EXTREMELY low.
Jim, is
On Nov 10, 2014, at 7:30 PM, Joe Subich, W4TV wrote:
Depending on the crest factor (peak to average ratio) of the mode
in use, the average power from the KPA-5000 should be kept 6 to 10
dB below the rated maximum (e.g., 60 to 150 watts) just as a 100W
transceiver should be kept between 10
Since the K3 turns off the final stage when below 13 watts, does
that mean running 10 watts is a bad choice since that's running
the lower power stage at near maximum?
As it relates to that part of the distortion caused by compression
or clipping in the amplifier chain (IF- Low power
On Wed,11/19/2014 3:50 AM, Ken wrote:
On Nov 10, 2014, at 7:30 PM, Joe Subich, W4TV wrote:
Depending on the crest factor (peak to average ratio) of the mode
in use, the average power from the KPA-5000 should be kept 6 to 10
dB below the rated maximum (e.g., 60 to 150 watts) just as a 100W
Joe made this statement assuming that the KPA500 produced FAR more
distortion than it actually does. A few days later, I showed
measurements with a K3 driving a KPA500 to 500W with PSK31 showing
that the distortion was EXTREMELY low.
Jim, is misconstruing what I wrote. I specifically said
On Mon,11/10/2014 4:59 PM, mcduf...@ag0n.net wrote:
Full linearity is needed for these modes to keep IMD under control.
Huh? Full linearity would be zero distortion. ALL amplifiers have some
amplitude distortion. See ARRL test results for a sample of current
products. 2-tone IMD in the range
On Mon,11/10/2014 11:20 PM, Jim Brown wrote:
P3SprectrumMeasurementsSlides.pdf
That should be k9yc.com/P3SprectrumMeasurementsSlides.pdf
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On 11/10/2014 5:56 PM, mcduf...@ag0n.net wrote:
On Mon, 10 Nov 2014 09:34:09 -0800, Jim Brown wrote:
During KPA500 beta, I was loaned one for a major RTTY contest weekend
and told to run it with all the lights lit. I did, and it worked fine.
In the 3-4 years I've owned one, I regularly run it
Funny, just yesterday I was looking at CW signals on my P3, noting the
skinny ones and the ones with fat bottoms. When you listen off the side
of the fat ones, of course, you can hear the clicks.
I happened to tune to one of the skinny ones just in time to hear the
operator say he was a using
This happened with my KPA500 until I realized that my Microham double-six
antenna switch is only rated to max 30MHz.The SWR was fine, but KPA 500
kept faulting on 6 with High PA DISS fault code. Once i connected my 3el
SteppIR directly into the amp, it works full steam on 6 meters.
73,
Don't do it! If you can't get an answer here, contact Elecraft support. Your
KPA500 will work great on 6m once you get this issue resolved. Mine runs at
600w on 6m meteor scatter using FSK441 30 seconds on, 30 seconds off, for hours
on end, hitting 65C but soldiering on without complaint.
Yes, I suppose something may just need a slight adjustment. It just
frustrates me when things don't work like I expect them to. I was
always afraid to run JT65 at more than 80-100 watts until I saw this
post. Started trying higher power while keeping a close eye on the
temp. No faults on
On Tue, 11 Nov 2014 00:06:53 -0800, Jim Brown wrote:
Huh? Full linearity would be zero distortion.
I knew I shouldn't have used that word. :o)
Gary
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On Tue, 11 Nov 2014 04:30:17 -0600, Michael Eberle wrote:
I cannot get my KPA500 to run more than about 200W on 6M without getting
a PA DISS fault. Temp is not even up to 60C yet.
Between that and the KAT500 coming 'untuned' and faulting in the middle
of a QSO on 10M, I'm about ready to
Jim,
Recent measurements I've done of a K3 driving a KPA500 both with pink
noise on USB and keyed CW show that not to be the case.
Your measurements are not of the conditions I describe. You are using
*filtered and band limited pink noise* (slide #3 - EQ settings) not the
specific digital
On Tue,11/11/2014 3:26 AM, Nick-VE3EY wrote:
This happened with my KPA500 until I realized that my Microham double-six
antenna switch is only rated to max 30MHz.
Nothing specific about this antenna switch -- getting any matrix switch
like that to have low SWR at 6M is quite tricky to do. I
As others have said, check your jumpers, and especially any barrel or elbow
connectors you bought at a hamfest. They are junk. I learned the hard way
that paying through the nose for good connectors, like Amphenol, is cheaper
than buying a new 3CX800 tube, and saves hours of frustration.
I would submit that if they're no good for QRO, they're no good for QRP as well
(where every erg counts). Buy then use quality materials, it matters.
Rick, WA6NHC
iPad = small keypad = typos = sorry ;-)
On Nov 11, 2014, at 12:02 PM, Eric Norris norrislawfi...@gmail.com wrote:
Save them
On Tue,11/11/2014 7:17 AM, Joe Subich, W4TV wrote:
Your measurements are not of the conditions I describe. You are using
*filtered and band limited pink noise* (slide #3 - EQ settings) not the
specific digital signals I mention *and* your measurements are at PEP
not average power (slide #2 -
Then you have a problem. I regularly run my KPA500/KAT500 at full power
on every band, including 10M and 6M in all modes, CW, SSB, RTTY, FSK441
etc. As for the KAT500 faulting, I always run the KAT500 in manual
mode. It knows where to tune for my modes of operation and the
frequencies I
Jim,
Right -- my test conditions for SSB are MORE demanding than either
PSK31 or JT65A, and were intended to approximate the response of the
K3 (and amp) to a speech signal.
That SSB is *more* demanding than PSK31 is incorrect. SSB audio can
be compressed/clipped significantly without IMD
I would submit that if they're no good for QRO, they're no good for QRP as
well (where every erg counts). Buy then use quality materials, it matters.
This discussion reminds me of the problem Radio Shack introduced when they sold
some elbows that actually used a small diameter coil spring
On Tue,11/11/2014 2:33 PM, Joe Subich, W4TV wrote:
PSK31 on the other hand *can not* withstand *any*
compression without significant close-in IMD.
I don't know where you got the idea that I was suggesting compression
for PSK31. My testing with pink noise is intended to simulate speech,
and
On Sun,11/9/2014 2:18 PM, Phil Wheeler wrote:
How much power out were you running on RTTY with your KPA500? I'm
interested because I have the amp, but have not yet used it on digital
modes (use the K3 barefoot at 25 W or so).
During KPA500 beta, I was loaned one for a major RTTY contest
On Mon, Nov 10, 2014 at 9:34 AM, Jim Brown j...@audiosystemsgroup.com
wrote:
On Sun,11/9/2014 2:18 PM, Phil Wheeler wrote:
How much power out were you running on RTTY with your KPA500? I'm
interested because I have the amp, but have not yet used it on digital
modes (use the K3 barefoot at 25
On Mon, 10 Nov 2014 09:34:09 -0800, Jim Brown wrote:
During KPA500 beta, I was loaned one for a major RTTY contest weekend
and told to run it with all the lights lit. I did, and it worked fine.
In the 3-4 years I've owned one, I regularly run it at full power in
digital modes on all bands,
No lectures on low power for JT, I run power depending on
propagation, or lack thereof, mostly on a dead six meter band.
Note that JT65 and JT9 are designed to be suitable for saturated
amplifiers as there is only a single tone at a time and one tone
ramps down before the next tone ramps up.
On Mon, 10 Nov 2014 19:30:01 -0500, Joe Subich, W4TV wrote:
Note that JT65 and JT9 are designed to be suitable for saturated
amplifiers as there is only a single tone at a time and one tone
ramps down before the next tone ramps up. *DO NOT* try running
PSK, MFSK, etc. modes at 600W average
On Mon, 10 Nov 2014 16:56:57 -0700, mcduf...@ag0n.net wrote:
I'm not one
to push much beyond that, as that's all the warmer it gets in JT exchanges
running power. No lectures on low power for JT, I run power depending on
propagation, or lack thereof, mostly on a dead six meter band.
I
On Mon,11/10/2014 4:30 PM, Joe Subich, W4TV wrote:
*DO NOT* try running
PSK, MFSK, etc. modes at 600W average power from a KPA-500 as you
will be generating serious IMD and garbage.
Recent measurements I've done of a K3 driving a KPA500 both with pink
noise on USB and keyed CW show that not
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