And a whole $2.00!
That's pretty much what the Heathkit one looks like, only red.
73,
Scott K9MA
On 12/2/2020 3:56 PM, Harry Yingst wrote:
Looks like Jenson Tools sells them
Look Here
https://www.jensentools.com/menda-35120-four-way-nut-starter/p/758ie351
On Wednesday, December 2
them. They were red.) I looked in the toolbox, and there
were two of them! (They're still red.) Given all the hex nuts in the
KAT500 kit, if I hadn't already had them, I'd have been glad to pay an
extra 10 cents or so if one were included with the kit.
73,
Scott K9MA
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A friend in Europe is setting up a K3 and KPA500 for remote operation. Does
anyone know of a suitable 240 V EU remote power switch?
73,
Scott K9MA
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of my experience on other bands, etc. The effect of
SWR on the amplifier, of course, depends on the actual impedance at the
amplifier, so in some cases it may be more or less sensitive to SWR.
Do others see similar effects?
73,
Scott K9MA
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the right source. You can relay the home receiver by phone,
VHF/UHF, etc.
73,
Scott K9MA
On 2/20/2020 11:48, Phil Hystad via Elecraft wrote:
I once had a noise issue and I used my KX3 roving about the neighborhood to
find it. Actually, I found a number of loud noise sources doing that as I
That's very high efficiency for a solid-state amplifier. Are they
operating in class C? Are there any IMD specs at those output levels?
73,
Scott K9MA
On 2/11/2020 03:18, Edward R Cole wrote:
I checked the operating specs on two of my QRO amps. Not a KPA500.
2m-1500w PA using a MRF1K50
. REAL RF amplifiers don't behave that way, as
the test results show.
https://en.wikipedia.org/wiki/Power_amplifier_classes#Class_B
73,
Scott K9MA
On 2/10/2020 09:23, Doug Turnbull wrote:
Hello Andy,
I do not have the numbers and also would like them. I understand
that efficiency
an amplifier capable of 2.5 kW at 1.5
kW would probably keep the IMD pretty low, even with a moderate
mismatch. It would also be very expensive.
73,
Scott K9MA
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Supply voltage, under load, at the radio?
73,
Scott K9MA
On 2/8/2020 16:14, Conrad PA5Y wrote:
I have some comments.
My TX IMD is even worse and I was not very happy with the advice I got from
Elecraft. I was advised to use the radio in test mode and use an external
amplifier
Basically, based on Bob's measurements, the power dissipated is fairly
independent of drive level. So, running at reduced power really isn't
stressing anything any more that full output. (Unlike an "ideal" class B
amplifier.)
73,
Scott K9MA
On 2/6/2020 16:06, Bob McGraw K4TAX w
shipping. 73,Gary K9GS
I haven't had any failures, but a while ago I ordered some spare
encoders and pots for my K3, just in case they aren't available in the
future.
73,
Scott K9MA
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to like mine at 400.
73,
Scott K9MA
On 1/30/2020 22:20, Joseph Shuman via Elecraft wrote:
I have been using a KX2 with the ATU a little over a year, my first and only
radio. I love it and have had great success in field throwing a 58’ wire up a
tree and a 13’ counterpoise on the ground
Isn't peak power for AM 4 times the average (carrier) power?
73,
Scott K9MA
On 1/23/2020 18:10, Don Wilhelm wrote:
John,
The KPA500 is rated for 500 watts PEP.
With AM, that is 250 watts carrier, and 250 watts of sideband energy
(125 watts for each sideband). So your "talk power&qu
happens to want to magnetize it more in the same
direction at turn-on, the core can saturate for half cycle. It's a
random event, which doesn't happen often, but it's hard on switches. It
can also make that "bong" sound at turn-on.
73,
Scott K9MA
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Yes, I did those mods to my FT-1000D long ago. It helped, but it's still
pretty bad. I can detect the FT1000's a (couple thousand) mile(s) away
on the P3.
73,
Scott K9MA
On 1/17/2020 14:14, Jim Brown wrote:
On 1/17/2020 11:56 AM, K9MA wrote:
The FT-1000 is notorious for its key clicks
it
any more. I don't think that is related to QSK, as it's just as bad in
PTT mode.
73,
Scott K9MA
On 1/17/2020 05:17, E.H. Russell wrote:
As I recall the FT-1000D accomplished that by shortening the dits and
producing an astonishing clatter.
THANKS,
73 ED W2RF
-Original Message
the above speeds, I could just detect the
change in pitch.
Increasing the bandwidth and turning off the AGC didn't make much
difference.
I didn't try the QRQ mode on the K3.
It will be interesting to see how the K4 compares.
73,
Scott K9MA
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In Australia, there are sheep stations the size of Belgium!
73,
Scott K9MA
On 1/2/2020 10:37, Rick M0LEP wrote:
A few days back I heard that the area burned so far during this fire
season in Australia could best be measured in terms of the size of Wales
or Belgium.
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Typically, there are small resistors at the power supply between the output and
sense terminals to prevent the voltage from rising if a sense wire opens up.
73,
Scott K9MA
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> On Dec 24, 2019, at 5:39 PM, Bob McGraw K4TAX wrote:
>
> Yes
There can be stability issues with remote sensing. Also RF susceptibility.
Take care!
73,
Scott K9MA
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> On Dec 24, 2019, at 4:03 PM, Don Wilhelm wrote:
>
> That would be a neat thing to do, but DO NOT do that on a pow
direction, and it is at least 7 dB weaker with a dummy load.
I have submitted a request to tech support.
73,
Scott K9MA
On 12/17/2019 13:44, Eric Swartz - WA6HHQ, Elecraft wrote:
Hi Scott,
We have seen this in rare cases on a few 1500s. It appears to be
caused by the ground connection
think the effect would be far more dramatic in a quiet location. (My
antenna is about 100 feet from the amplifier, which is in the basement.)
73,
Scott K9MA
On 12/16/2019 16:16, Chris Codella, W2PA wrote:
Scott,
I noticed the same thing this last weekend, having not been on 10 much
since getting
Hi Pete,
It did help to put a couple ferrites on the PS control cable. It's now
barely perceptible, but that's with an urban noise level. It's
definitely coming in via the antenna, something over 100 ft away.
73,
Scott K9MA
On 12/14/2019 21:03, N4ZR wrote:
I just tried that with my KPA
. Has anyone else experienced this and found a cure? (Other
than using the old amp tube.)
73,
Scott K9MA
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I'm thinking it might be a good idea to stock up on K3 parts I might
need in the future, when they may not be available. Two likely
candidates are the main VFO encoder and the AF/RF gain pots. Any other
suggestions?
73,
Scott K9MA
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would still be protected against
erroneous data from the radio. But Dick probably has more important
things to worry about.
73,
Scott K9MA
On 12/11/2019 11:34, char...@k5ua.com wrote:
I should have checked for a new manual since the manual that came with
my KPA-1500 has 20 Kc bins which I see
for 1/2 second, or so.
Another factor is that the ATU only measure frequency to, I think, 8
kHz. The net result may be that sometimes it's not in the frequency
segment you think it should be in. Unless you have a very narrow band
antenna, it shouldn't make much difference.
73,
Scott K9MA
With AGC-F set to 200, "new" QSK, tnd the new synthesizers, I can just
barely hear between the dots at 24 wpm. (non-QRQ mode).
That's the only thing a miss about my old FT-1000D. No one misses the
key clicks.
73,
Scott K9MA
On 12/6/2019 12:26, Wayne Burdick wrote:
The K3 can
A related question: Will the latency and turn-around time of the K4 be
fast enough for true QSK operation? The K3 can only hear between words
above about 10 wpm, and QRQ mode doesn't help much.
73,
Scott K9MA
On 12/6/2019 09:13, Wayne Burdick wrote:
As an SDR, the K4 has no need to shift
, one would not want to
change the calibration of that radio.
73,
Scott K9MA
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e. How can the
KPA1500 ATU be made to switch that fast? It's relays certainly can; it's
just a matter of getting that control signal to them.
I doubt there is any way to modify the KPA1500 to make this happen
without changes to firmware.
73,
Scott K9MA
On 11/20/2019 08:40, N4ZR wrote:
I hope that th
is not acceptable, as that would require two
operations to switch antennas, which is way too slow. (I sometimes have
to flip the antenna switch several times during a call to determine
which antenna to use.)
73,
Scott K9MA
On 11/19/2019 13:02, K8TE wrote:
Another issue not explicitly mentioned is using
to design an external box or write some PC software to
perform that function.
73,
Scott K9MA
On 11/19/2019 06:55, Andy Durbin wrote:
"Yes, ALC that really worked well with an amplifier would make the above
unnecessary, but I don't think anyone has figured out how to do that.
Until someone
On 11/18/2019 21:52, Paul Baldock wrote:
I also have WET and DRY settings for one of my antennas that are
selected by PF1 (^PB).
Ah, but there can be more than two setting. A little wet, or a lot wet.
Or, in the case of one of my antennas, varying amounts of frost.
73,
Scott K9MA
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loop adjusting drive power would
solve the problem above, not introduce any distortion, and save us
operators the bother of riding the power control.
73,
Scott K9MA
On 11/18/2019 20:32, N4ZR wrote:
Jim, I think Paul is talking about something different here. On Page
18 of the manual
Thanks, Ken. I didn't think to check the firmware release notes. That
feature was added in 2017.
73,
Scott K9MA
On 11/17/2019 16:39, Ken K6MR wrote:
I think you are looking for the Tx line out monitor level. LIN OUT
(from Config menu) and press 2. 0 should give you no monitor output
to the computer.) I can't find anything in the manual about
this. At the very least, it would be helpful to be able to match the
levels of the TX and RX audio. Am I missing something? Any suggestions?
73,
Scott K9MA
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this, but I've never found the K3 NB to be all that effective, even
when the band was empty.
The above would work in the HDR mode, of course.
I was also wondering if there might be a way to do this with the SDR,
without tying up the sub RX.
73,
Scott K9MA
On 11/11/2019 10:17, Wayne Burdick wrote:
Hi
?
73,
Scott K9MA
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es berserk in
the middle of a contest.) But the radio also has this software stuff in
it, so I put the amplifier in standby, the idea being that 100 W
probably won't do as much damage as 1500. Unless, of course, I deem it
worth the trouble to turn off the other switches.
73,
Scott K9MA
On 10/27/2019 2
be float charged like other types. I think all the Li-ion
charge controller chips do this.
See:
https://batteryuniversity.com/
73,
Scott K9MA
On 10/26/2019 17:39, Don Wilhelm wrote:
I have Lithium batteries in my laptop, my KX2, my electric razor, a
tactical flashlight, and maybe some other
, of
course.
73,
Scott K9MA
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is seeing.
73,
Scott K9MA
On 10/23/2019 12:24, Jim Rhodes wrote:
Actually the fact that you were using the internal tuner doesn't change the
chance that with the settings on the auto tuner don't tell you which
direction the tuning of a certain antenna approach unity from. So there
could be twice
in the first place.
OK, the radio is 9 years old, so I don't mind paying for the
replacements, but still
73,
Scott K9MA
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of the ATU is to make the actual load as close to that as
possible. One result of that is that a rather small mismatch can have a
large effect on efficiency and/or linearity.
73,
Scott K9MA
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obably due to the same effect. (A 1.3:1
SWR could be a load impedance of anything from 39 to 65 Ohms.)
73,
Scott K9MA
On 8/31/2019 09:15, Roger D Johnson wrote:
I think I've discovered a fly in my ointment! The efficiency
that the amp displays is based on it's determination of the
output power.
This is nothing unique to the KPA1500: ALL class AB amplifiers behave
this way. Even an "ideal" class AB amplifier has a maximum dissipation
at around half of full output.
One thing running at lower output probably will buy you is lower IMD.
73,
Scott K9MA
On 8/29/2019 08:0
if the
filters are properly cooled, as they apparently are, but still requires
manually riding the power control.
73,
Scott K9MA
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> On Aug 26, 2019, at 7:34 PM, Bob Wilson, N6TV wrote:
>
> As for KPA1500 output power variation with te
if the
antenna SWR is “only”, say, 1.5:1.
I keep hoping Elecraft will come up with a way to automatically adjust drive
power to maintain constant output. That would also compensate for change in
temperature.
73,
Scott K9MA
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> On Aug 24, 2019, a
is why it's so hard to close the
ALC loop around an external amplifier. If it works with the 100 W
amplifier built into the transceiver, why won't it work with a bigger
amplifier? (And it seems about universally agreed that it won't.)
73,
Scott K9MA
On 7/12/2019 23:32, Wes wrote:
You do know
will be happier.
73,
Scott K9MA
On 7/5/2019 13:20, Mark Goldberg wrote:
I stand corrected.
I made an assumption, probably incorrectly, that the reason they had a
second tuner was that the first did not successfully tune the antenna. They
just decided to put the bandpass filter between the two tuners
actually measure the parameters that are really
important, like harmonic attenuation, and see whether it is good
enough. Even then, though, there's uncertainty, as that measurement is
usually made with a dummy load. What if the impedance of your antenna at
a harmonic isn't 50 Ohms?
73,
Scott K9MA
some very good passive headphones,
however. I don't think it's realistic to expect to be able to operate
with an amplifier in the shack without headphones. However, the KPA1500
is fully capable of remote operation, so you could put it in the next room.
73,
Scott K9MA
On 6/10/2019 18:57, eric
of a career designing spacecraft
electronics.
73,
Scott K9MA
On 6/10/2019 11:01, Bert wrote:
I haven't experienced that a switched PS causes overvoltage. They
usually just die!
Bert VE3NR
On 6/10/2019 11:12 AM, K9MA wrote:
On 6/9/2019 23:16, Bert wrote:
How would a switched PS take out
fast enough to drown it out. Not to mention those in the KPA-1500.
I'm very happy with the Samlex supply. I've never detected a trace of
RFI from it.
73,
Scott K9MA
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Gee, I’m left handed, and I LIKE to tune with my right, so I can send with my
left.
73,
Scott K9MA
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> On May 31, 2019, at 9:37 AM, Wayne Burdick wrote:
>
> Even in the case of the K3, the VFO and RIT controls are on the right side of
, and other power
control equipment. That noise is NOT impulse noise, and noise blankers
cannot act on it.
Alas, even in my urban neighborhood, I fear the day is coming when all
this electronics generated noise will drown out the line noise.
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to a nearby but clear frequency to control the
noise blanker. It seems that a direct sampling receiver ought to be able
to do something like that.
73,
Scott K9MA
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I've never found the K3 noise blanker to be very effective on power line
noise, and I've tried all possible combinations of settings. If the K4
noise blanker were really effective on line noise, I might buy one.
73,
Scott K9MA
On 5/29/2019 20:39, Wayne Burdick wrote:
There are some
aps 15 wpm, as if
the processing just can't make the effective bandwidth any lower.
Perhaps the real advantage of the JT modes is that they can take
advantage of the lower noise bandwidth at very slow speeds, while our
brains can't. It would be interesting to compare the performance at 15 wpm.
73,
Scott K9MA
On
equipment wired that way!
73,
Scott K9MA
On 5/18/2019 19:16, Jim Brown wrote:
On 5/18/2019 4:28 PM, Clay Autery wrote:
230VAC on 3 wires? Never knew they did 3 wire 220V I always
assumed it was still 2 hots and ground (plus an optional neutral).
Two hots (phases) and ground is three
available.
73,
Scott K9MA
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close the PTT circuit in QSK mode, you get a
carrier. I'm glad the K3 doesn't work that way.
73,
Scott K9MA
On 4/24/2019 09:12, Don Wilhelm wrote:
Scott,
What do you mean by "if I get tired of all the racket"?
The Elecraft gear is all electronic switching for T/R, so no relay
clack
old tube amplifiers. (There's another switch in the keying line, just in
case the computer goes nuts. Of course, that could NEVER happen.)
73,
Scott K9MA
On 4/24/2019 08:14, N4ZR wrote:
This appears to be, at least in part, a simple matter of RTFM. Also,
my manual is 9 years old, and there's
, all the wires which run together can go through a single
core. No capacitors were necessary. All but the power cord a small
enough you can get a lot of turns on a small split core.
73,
Scott K9MA
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rge enough, but it would have to work as well as a
hardware version.
73,
Scott K9MA
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sure the voltage isn’t dropping
more than a couple Volts.
73,
Scott K9MA
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> On Mar 15, 2019, at 1:25 PM, Gary J Ferdinand wrote:
>
> I’m in the process of checking out my amp. I have two dipoles (40 and 80).
> At resonance both show
The ATU in the KPA1500 alone will achieve the 1.2:1 match with the 2.09
firmware, now in beta. The external tuner is not necessary, unless the antenna
SWR is very high.
73,
Scott K9MA
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> On Mar 12, 2019, at 10:24 PM, Peter Dougherty wr
. (And may splatter on
SSB.) Elecraft recently updated the ATU firmware to consistently find a better
match, and it really helps.
73,
Scott K9MA
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> On Mar 11, 2019, at 8:49 PM, Peter Dougherty wrote:
>
> I have a couple of questions about the
, you're running a 2.5 kW amplifier, but that kind of margin is
expensive.) So, if anyone could figure out how to get ALC to really work
with an amplifier, I think that would be worth paying extra for.
73,
Scott K9MA
On 2/28/2019 13:12, Bob McGraw K4TAX wrote:
Yes, improperly or incorrectly using ALC
The nice thing about those linear power supplies, though, was that you
COULD repair them.
73,
Scott K9MA
On 2/26/2019 09:52, Phil Kane wrote:
On 2/25/2019 6:36 PM, Kevin McQuiggin (SFU) wrote:
Not to sound like some old codger, but perhaps designs aren’t as robust as they
used to be.
More
fine, and you would never have to
replace it again.
73,
Scott K9MA
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the emitter of the transistor and the load. A few
turns of the appropriate sized wire around a ferrite bead usually works.
73,
Scott K9MA
On 2/25/2019 18:57, William Rascher wrote:
On Monday, February 25, 2019 4:26:40 PM CST Rose wrote:
I've found instances of regulation failures caused
by loose
Another possibility is all those SDR's sitting in unheated sheds sending
RBN spots. That, of course, would lead to more or less random frequency
errors.
73,
Scott K9MA
On 2/21/2019 23:12, Mike Flowers wrote:
Perhaps what we are seeing here is the cumulative error of the transceivers
just offset the XIT 30 Hz or so.
73,
Scott K9MA
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the main problem, as the switching occurs even if tuning has
stopped for longer than that.
Stay tuned.
73,
Scott K9MA
On 2/21/2019 09:36, Jim Miller wrote:
Things to check
Could be bad aux cable. Is it from Elecraft?
Do you have anything else connected to aux?
Are you sure connectors
Hang on to that low pass filter!
73,
Scott K9MA
On 2/19/2019 10:55, Phil Kane wrote:
On 2/18/2019 8:41 PM, K9MA wrote:
Here, Don is talking about external low pass filters intended to
suppress VHF harmonics. If you live in an area where TV signals are
weak, they may still be necessary
it would be hard to tell.
73,
Scott K9MA
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I use a single PL-259 for all the transmitting antennas as a lightning
disconnect. I can attest to the fact that trouble ensues if I forget to
tighten it with the pliers. I crashed my computer during the contest
today. Twice, before I caught on.
73,
Scott K9MA
On 2/16/2019 21:40, Drew AF2Z
will sometimes drop to perhaps 2/3 the rated output, or the amplifier
will fault due to high current or drive power. I expect the Expert 2K
would have enough margin to put out 1.5 kW at higher SWR, but that extra
margin comes at a cost.
73,
Scott K9MA
On 2/12/2019 15:44, Dave wrote:
Has anyone had
Hi Ken,
At the frequency of interest, the KPA1500 ATU goes right to bypass mode
with a dummy load.
73,
Scott K9MA
On 2/6/2019 10:06, wa2...@gmail.com wrote:
Scott,
Did you try testing with a 50 ohm dummy load instead of an antenna?
How goes it react?
/Ken /
/WA2LBI /
/LG G6
, etc. are available.
73,
Scott K9MA
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in the KAT3A. It was there, presumably to improve
IF rejection, so I'd expect removing it without some other change to the
K3 would be unwise.
73,
Scott K9MA
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that of a 12 inch round loop. Granted, such a large pack
wouldn't exactly be inconspicuous on an urban hiking trail, but you
could always put some rocks in it, and pretend you're training for a
Grand Canyon hike.
73,
Scott K9MA
On 1/22/2019 16:09, Grant Youngman wrote:
Yes, it does not have
On 1/22/2019 15:46, Grant Youngman wrote:
The problem is loop diameter.
It doesn't have to be round.
73,
Scott K9MA
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to get 3 Hz closer that way,
within the 1 Hz tuning resolution. 3 Hz is close enough, though.
When listening for the beats, you have to match the volume of the
sidetone and carrier, or you won't hear them. You don't need a musical
ear, just a functioning one.
73,
Scott K9MA
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be in
unheated buildings, too.
73,
Scott K9MA
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, as
it otherwise would have required additional (expensive) crystals. Does
anyone know of a non-synthesized transceiver that didn't have the CW
offset problem?
73,
Scott K9MA
On 1/21/2019 23:09, Wayne Burdick wrote:
Elecraft's auto-spot and CWT features -- available on the K3/K3S/KX2/KX3
I'm rather attached to using 400 Hz. Has anyone heard anything about a fix?
73,
Scott K9MA
--
Scott K9MA
k...@sdellington.us
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of my friends, completely isolated left and right headphones.
73,
Scott K9MA
On 1/16/2019 09:36, Don Wilhelm wrote:
The K3/K3S Line Out already has isolation transformers internal to the
K3. I do not understand any need to put additional transformers in
the audio path(s).
What happens if you
On 1/16/2019 10:00, Walter Underwood wrote:
When I need to drive two sets of headphones, I use a $25 Behringer HA400
headphone distribution amp.
https://www.amazon.com/Behringer-HA400-Ultra-Compact-4-Channel-Headphone/dp/B000KIPT30
Any trouble with RFI?
73,
Scott K9MA
--
Scott K9MA
k
of less resistance was to insert the isolation transformers.
They are just common 600 Ohm transformers, like the ones in the K3 line
outputs, but they're a bit lossy driving headphones.
73,
Scott K9MA
On 1/16/2019 09:02, Bob McGraw K4TAX wrote:
I see no need for isolation transformers
jack to drive two sets of the low sensitivity
headphones I use. And I don't want a cable in the way to the front panel.
That's why it's "complicated".
73,
Scott K9MA
"Everything should be as simple as possible, but no simpler." -- Albert
Einstein
On 1/15/2019 23:38, Don
headphones.) I just wired a switch to an external speaker.
73,
Scott K9MA
On 1/15/2019 20:51, Nr4c wrote:
Why use Line Out for speakers. There is a perfectly good jack marked Speakers
right next to the Phones jack. Be sure and use a Stereo plug but it is for
wait for it. Speakers
K9MA
On 1/15/2019 16:04, Don Wilhelm wrote:
Gernot,
If you have the subRX, why not tune to listen for those off-frequency
stations with the VFO B knob. Your transmit frequency is unchanged on
VFO A, so no need for RIT unless you are only listening to the mainRX.
An easy VFO A>B pushbut
e, but I'd rather not go that way.
Anyhow, I'm hoping maybe just a little mod to the K3(s) firmware could
provide a way to use RIT with VFO B.
73,
Scott K9MA
On 1/14/2019 23:58, Bob Wilson, N6TV wrote:
On Sun, Jan 13, 2019 at 9:15 AM K9MA <mailto:k...@sdellington.us>> wrote:
I'v
signals. (I know, I could
add a VGA display.) Other than the RIT issue, running on VFO B and the
sub rx works well.
If there were a setting, say, to make the RIT apply to VFO B only when
the sub was on, the problem would be solved.
73,
Scott K9MA
--
Scott K9MA
k...@sdellington.us
Thanks, Gernot. I came to the same conclusion. I also tried using
"BSET", but it doesn't enable the RIT on VFO B. Maybe a firmware update
could fix that?
73,
Scott K9MA
On 1/14/2019 19:01, g...@gmx.net wrote:
Scott,
I looked at the programmer ref manual and realized there is onl
or LSB (CW or
CW REV). I found that the filter drifted around quite a bit with
temperature. So, if you have the narrow filters, let the temperature
stabilize before setting the offset. Wider filters are much less critical.
73,
Scott K9MA
On 1/14/2019 17:13, Nr4c wrote:
Well
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