" The previous times ..." - ?
Good grief, how many times has this FET failed?
Ted W4NZ
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wes Stewart
Sent: Thursday, December 13, 2018 3:09 PM
To: elecraft@mailman.qth.net
I have used my KPA500 on both 110 and 240AC and I can honestly say that I
saw no difference in either supply voltage.
Mike va3mw
>
>
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Scroll down to the bottom of this and you will see it was me :-)
I have made hundreds of IMD measurements on both my K3 and K3S using the
built-in two-tone generator and an SDR-IQ/SpectraVue as a spectrum analyzer. I
have a string of power attenuators followed by a step attenuator for
Ted,
I am not going to comment on the dB aspect, but the XYL and I have had
great success in restaurants by asking the staff to turn down the music
(or TV or whatever was making electronic sound). In many restaurants,
it seems that the staff want to listen to *their* music over the din of
Someone suggested performing 2 tone tests. Seems reasonable.
I tried that with my K3S into a dummy load and an a RF sample fed to my
RSP1 receiver using HDSDR software. I find that it does indeed
display the IMD products from the 2 tones. I now need to study the
results a bit more to
It's been 50 years since I worked in the acoustic labs at Boeing where I posed
the same question. One of the specialists in the passenger accommodation
section of the lab explained it this way: the human ear is a SUBJECTIVE and
dynamic instrument. In other words, the perception of sound
If you see low power it's a clue. I operate my K3S + KPA500 as a 500W
transceiver, except when I'm running IMD tests, so the last time it happened I
was notified of bad audio.
The previous times the wattmeter or IMD tests were the clues.
Wes N7WS
On 12/13/2018 12:03 PM, j...@kk9a.com
Gwen Patton writes:
I do try to have the decode around 3 or 4, but code that'll decode with the
preamp off doesn't even make the CWT bar flicker with it on.
I copy code in my head but have played with the CW decoder on my KX2 for
amusement and also at our FD station so the others could see
That's how I discovered it. Normally I can work anybody I hear, but at the
start of WW I was working one in ten that I called in S, and after one long,
difficult exchange I was told I sounded terrible.
The day before I'd been working a Dxpedition on CW and FT8 and no problem,
until I started
Most human perception is logarithmic. A change in OVERALL LOUDNESS of
about 10 dB is perceived as twice (or half) as loud.
Changes in SIGNAL TO NOISE RATIO as small as 1 dB can be the difference
between copy or not. This is true for music as well as speech or CW.
When mixing live sound with
It seems that the KAT may not be getting fresh band info - if it did you would
be hearing relays being set before the K3 transmitted. The KPA500 is listening
to the same Band signals as the KAT (but not the Auxbus data), so I would turn
on the KPA500, leave it in standby, and watch the display
It would be nice to know what conditions caused this FET failure. Is there
an easy way to know when this failure occurs other than getting crappy
audio reports?
John KK9A
Peter Dougherty (W2IRT) wrote:
This happened to me at the start of CQWW-SSB in October. My K3s is finally
enroute back
Ok. You’re right. Must have had my mind on something else. Read too many
emails.
Merry Christmas. Or you know, whatever?!!
Sent from my iPhone
...nr4c. bill
> On Dec 12, 2018, at 9:11 PM, Peter Dougherty (W2IRT) wrote:
>
> This happened to me at the start of CQWW-SSB in October. My K3s is
KAT500 is in MANUAL mode
73 Eric WD6DBM
On Thu, Dec 13, 2018, 8:26 AM Bob McGraw K4TAX Just went through the setup for WSPR on 160M - 6M for my station, K3S,
> KAT500, etc.I have the KAT500 in MAN mode and it switches bands
> correctly. I didn't see any issues at 5 watts transmit.
>
>
>
Short & sweet...
I had issues with my K3s that required
factory work. Elecraft went the extra mile
to resolve them and were far more than
fair in doing so. There are few companies
that take care of their customers as well
as Elecraft.
I have said this before, here, and I'll
gladly say it
Make sure the 120v line/outlet is not getting warm. Measure ac
voltage with amp off and then in keydown transmit to check voltage drop.
I don't have a KPA500 or KPA1500 but did have a 8877 with
4kV PS. It ran at 750ma which is 3000w dc load. That converts to
12.5A at 240v if PS is 100%
A very unpleasant dinner last night at a restaurant with a reported noise level
of 84 db – about the same as a gas engine lawn mower seated at the next table –
raised what is probably an elementary question. 3 db is the familiar doubling
of power, and in an audio environment is a doubling of
I'll take a look at both of those suggestions.
I do try to have the decode around 3 or 4, but code that'll decode with the
preamp off doesn't even make the CWT bar flicker with it on. So there's
more at work here than signal strength. That's why I asked what I did. But
I'll try to work on
Just went through the setup for WSPR on 160M - 6M for my station, K3S,
KAT500, etc. I have the KAT500 in MAN mode and it switches bands
correctly. I didn't see any issues at 5 watts transmit.
Why is it re-tuning? Are you operating the KAT500 in the AUTO mode?
Just go through each
Eric,
Are you operating with the KAT500 in AUTO mode?
If so, after "training" the tuner across the band of interest with any
one antenna, change it to MAN mode and it will not try to re-tune.
As you said, the KAT500 follows the K3 VFO, so there should not be a
need for any retuning.
The
Why does the KPA3 have to be set to NOR instead of FN1 when doing a 50W TX
calibration? Just curious.
73 Eric WD6DBM
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I am using an early KAT500 with a K3S. When using WSPR in band-hopping mode at
5w, WSJT-X 2.0 commands a band change and transmit, the K3S starts
transmitting, then stops, changes bands, then changes back to the original
band, say 40 meters. I think this part is a WSJT problem, and has been
I would only agree with whoever mentioned the possibility of
flickering lights. If you're a CW operator it can be a
distraction...if your house wiring can't handle it. Been there...
John K7FD
-From: "Irwin Darack"
To: "Tom Berry"
Cc:
Unless you are having a problem, save your money. I have two KPA500’s, one
plugged into a 220V line at my main house and the other into a 110V line at
my beach house and have never seen a difference in performance. In
addition, on a number of contests Dx’peditions, were I have my K3s, KPA500
&
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