Jack...
Works just like you outlined. Also, I notice that the power out
indicator on the KPA500 reads the power out of the k3 when in standby
mode. I wonder how accurate that is compared to a dedicated inline power
meter. At any rate, looking forward to this new flexibility.
...robert
Is 17mSec not fast enough? When you hit the OP button on the KPA, it tells the
K3 to make the adjustment, and the power is very quickly changed. Same is true
when you go from OP to STBY, the K3 goes back to 100 watts.
I seriously question whether you can do things as fast with a macro and having
Mike and Jack...
Thanks for your suggestions.
Mike, I'm not clear "where" you are implementing your macro; perhaps you
are using the K3 utility. I'd like to avoid that and interact with the
radio directly. Jack, what I'm looking for is not different drive levels
on different bands, but
We thought about that when we designed the KPA500. Take a look at page 29 of
the K3S Rev A manual - "Per-band Power Control”.
You need to have the KPA500 communicating with the K3 through the Aux I/O cable.
It works amazingly well, no macros needed!
73,
Jack, W6FB
> On Dec 5, 2023, at 12:35
Is there a way to program a macro within the K3s to set power level(s)?
My goal is to be able to shift between low power barefoot [100w] and a
drive level for the KPA500 [15-20w]. Thanks
...robert KE2WY
--
Robert G. Strickland, PhD ABPH KE2WY
rc...@verizon.net
Syracuse, New York FN13xa
Gang,
I'm parting with my KPA500 / KAT500 combo. Was new from Elecraft in February
2021. Both units work perfectly and are cosmetically excellent. Includes
original manuals, 120V power cable and fuses, 1x KXSER (E850463), tuner power
cable, NEMA 6-15P power cable (the one I used), Key Line
I'm parting with my KPA500 / KAT500 combo. Was new from Elecraft in February
2021. Both units work perfectly and are cosmetically excellent. Includes
original manuals, 120V power cable and fuses, 1x KXSER (E850463), tuner power
cable, NEMA 6-15P power cable, Key Line cable, Computer interface
Thanks, Geert Jan, for recounting the 'origin story'
of the K2 'twins', the outboard combination of the
KPA100 and KAT100. I had not previously heard
of the origin and Lyle's (KK7P) role in that process.
I hope Larry can provide more detail about
the actual configuration of his outboard
KPA100.
Hi,
In addition to Mike's response (always happy to read his comments!), I
think it is useful to give some additional hints as you may need a
better understanding of the configuration you have.
The Elecraft K2 is a 15W QRP transceiver, with the optional QRP
antennatuner and the battary
Hi Larry,
You mention in the title '...Power Surge Advice.'
I presume your KPA100 was working properly
prior to not powering up?
You also describe the connection from your power supply to
the KPA100 and then to the K2 - does this
imply a Y-connection from the power supply
to both the K2 and
Advice would be much appreciated. I would start by saying that I am not
very electronically skilled. The power suppy goes from the power supply to
a KPA100 in a separate enclosure which I built from a kit, then to the K2
Radio. The KPA100 does not light up, no power.
73 - Larry(G0IKE)
Hi Dave, Joe, and Jim
The GMSK to AM distortion across any 50 Hz bandwidth of a K3 filter would seem
to be minor. With an FT8 symbol rate of 6.25 symbols per second, would that not
create some relatively weak 6.25 Hz sidebands plus a bit of mush around those
lines due to the pseudorandom
Doppler caused "spreading" is readily identified ... the spreading is
generally in one direction (because airport "patterns" run in one
direction) and often manifests as a second signal offset by 60-80 Hz
(which can be independently decoded). IMD is generally in both
directions and can not be
On 7/23/2023 9:49 AM, Andy Durbin wrote:
It is my belief that many of the wide FT8 signals seen on 6 m FT8 are caused by
Doppler shifted aircraft reflections. It's very common here in the Phoenix
metro area and does not imply that the transmitted signal was in any way
abnormal.
YES! It's
"Clean FT8 spectra is badly needed, especially in metro areas at 10 meters and
above, where many poor quality FT8 signals abound and wipe out many of the
weaker stations that other stations are trying to receive. Yes, there are
suggestions that folks in the same area all transmit at the same
Whereas it was written: "The manufacturer says use 5 bars of ALC, end
of story. I don't buy that at all." (W3IP)
The manufacturer DOES NOT say use 5 bars of ALC. However, it does say
use 4 bars of audio as displayed on the ALC scale and the 5th bar
flickering. This is per the writer of
Hello Mike,
Thanks for sharing your data!! Help me understand something you said...
Are you saying that at 2 bars, (for your K4), all spurious signals, are
at least 80 dB down from carrier, while at 5 bars, all spurious signals
are running around 50 or 60 dB down from carrier?
73, and
Oh my goodness!
What Don, W3FPR wrote is 100% correct!
Whomever K3 user told you to EVER use the output control other than MAX at ALL
TIMES needs to go back to learning. They are NOT helping you. (NK7I)
I'd go back to what Elecraft says in their manual. (K9YC)
Again, READ THE K3 OWNERS
That the K3 and K4 are clean transmitters (for a 12V final) is awesome for
everyone on the air. Elecraft sets the bar again.
But the highly popular JT modes are not the only audio based digital modes used
these days. Others are more complex than one continuous phase shifted tone.
With that
I have been running tests on K3s and K4s to understand the conditions needed
to transmit clean FT8 signals. I have previously shared some of my findings
with Pete N4ZR and a couple of other folks. Their feedback has been very
valuable.
Joe Taylor, K1JT has shown the spectral purity of the FT4
"It will remain as clean as the audio, up to the point the ALC begins to kick
in; then it goes bad like any other radio. That’s the fault of ALC, not the
radio."
What goes bad? Nothing goes bad for a Kenwood TS-590S when drive level moves
into the ALC closed loop control range. Remember
Are you sure the "technically-qualified local ham" was not running his
tests in SSB instead of DATA A? There are more than a few "technically-
qualified" individuals who insist on using SSB instead of DATA_A with
WSJTX and that makes all the difference in the ALC display.
Again, READ THE K3
Pete,
I would suspect that the local ham didn’t account for you overdriving his
receiver (or test set) which would explain why an underdriven signal appeared
cleaner (no overload). Had he attenuated your 4 bar signal, it would have been
clean, I’m 100% certain.
A full audio supplied (just shy
Sorry, but I would want to see live spectrum displays of my own rig with
a known hardware setup instead of images of some other K3 with unknown
K3 settings and unknown test setup. Hundreds of us have been following
the just barely flickering 5 bar rule with excellent performance.
You know
I recommend finding someone with a P3 or other spectrum display and trying this
on *your* K3 rather than looking at pictures of “a K3”. Running with
insufficient audio drive, which is what you are doing, has known problems,
which you are experiencing.
I would be glad to do it with my KX3 and
OK guys - rather than reply individually, let me try to pull everything
together in one message.
In a previous effort at FT8 I followed the standard advice to set the
power slider in WSJT-X (on the lower RIGHT side) so that my K-3 showed 4
bars on the ALC meter, just below the threshold for
Hi Jim,
Maybe you’d feel better knowing that with WSJT-X at max; I had always adjusted
the OS driver level plus the rig levels, starting mid range on both. And from
midway, find the right blend to get the level to be proper with neither control
at (or near) max so nobody shouts and no one
On 7/20/2023 2:47 PM, Rick NK7I wrote:
s said MANY times, set the WSJT-X output to MAX, then IGNORE IT.
Hi Rick,
This is the only part of your excellent advice that I disagree with. The
reason is that the analog stages of computer gear tend to be poor, and
start generating increased
On 7/20/2023 2:16 PM, Pete Smith N4ZR wrote:
I've recently started operating FT8, and on advice from other K3 users,
have been adjusting the power slider in WSJT-X to a level just short of
or just into the first flickers of ALC. I did this because I was
advised that setting the slider for 4
Yes, it hunts for a couple seconds first time on a change (freq, mode,
power, turn on). Elecraft mentioned it has to do with it setting its power
level (it works a bit to get stabilized and not noticed normally). After
the first TX time it will be fine.
Dan KI6X
Message: 14
Date: Thu
Whomever K3 user told you to EVER use the output control other than MAX at ALL
TIMES needs to go back to learning. They are NOT helping you.
The WSJT-X output control is an AUDIO control, not an RF output control.
On any rig made since 1985, one wants to adjust the RF for RF and the audio for
Pete,
Set the audio level to make the first 4 bars of the ALC meter solid with
the 5th bar just flickering.
The K3 ALC onset is at the 5th bar, the bars below it are an aid to
adjusting the audio properly for digital modes.
Your advice from "other K3 users" is not correct. ALC starts at the
Pete:
The first 4 bars on the K3 ALC are just an audio level indication [i.e.
VU meter]. ALC action starts at the 5th bar, which you want to be just
flickering. Unless you have 4 solid bars, the K3 will keep trying to
adjust the TX gain to achieve the selected output power and it may not
By “first flickers of ALC” do you mean one bar flickering? If so, that will
cause power hunting.
Not sure who advised against setting it at the 4th bar, but that was probably
bad advice. That sounds like advice for non-Elecraft transmitters. I recommend
following the setup instructions on
Hi Peter,
Setting the ALC for FT8 is different than other transceivers due to the way the
K3 adjusts power.
You should adjust the slider to give four solid bars and the fifth flickering.
You find the outputvwull be ver stable then.
See you on the bands!
—-Paul AK1P
Sent from my iPhone
>
I've recently started operating FT8, and on advice from other K3 users,
have been adjusting the power slider in WSJT-X to a level just short of
or just into the first flickers of ALC. I did this because I was
advised that setting the slider for 4 or 5 bars of ALC generated junk in
the FT8
I have been using my silent SPA 8230 power supply for many years. Its mains
switch started show contact errors, would like to replace it. As QRP Shop
Biz in Germany closed last year need help to find where can I find switch
replacement. Could you please help with the switch type and manufacturer
Hello Dave,
I have a K1 that I’m looking to sell, and took a look at the power output
before listing it. Power output is as follows:
40 meters 5.2 watts
30 meters 4.5 watts
20 meters 1.3 watts
17 meters 0.7 watts
These are obviously not the expected power output levels. Power supply
Numbers using the Elecraft 20 watt dummy load rather than resonated antennas:
40 M 4.8 W
30 M 5.5 W
20 M2.0 W
15 M1.7 W
Dave K9SW
> On May 11, 2023, at 6:52 PM, DAVID MOORMAN wrote:
>
> I have a K1 that I’m looking to sell, and took a look at the power output
> before
Hello David,
The same issue also exists in my two K1. Waiting for help
73,
Vincent BH5HTF
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post:
I have a K1 that I’m looking to sell, and took a look at the power output
before listing it. Power output is as follows:
40 meters 5.2 watts
30 meters 4.5 watts
20 meters 1.3 watts
17 meters 0.7 watts
These are obviously not the expected power output levels. Power supply voltage
= 12.8
On 2022-08-14 08:43, Dick Dievendorff wrote:
The KPA1500 power supply container houses several power supplies. Only
a small one is on all the time. It can run a microcontroller and
switch the larger supplies, but not much else.
*** And with good reason. It's hard to switch say 65Amps at 50V (
The KPA1500 power supply container houses several power supplies. Only a small
one is on all the time. It can run a microcontroller and switch the larger
supplies, but not much else.
The 50V and 12v supplies are switched completely off when the amp is “off”. The
fans are associated with the
I leave my KPA1500 PS on continuously, whether I'm local or remote. No
observed ill effects. When the amp is off, the PS is silent. I haven't
measured its current drain in that condition but I expect it is minimal. I
have a remote relay box that I could use to key a larger relay in the 230V
AC
Hello Lou
thanks very much for the information!
73,
Jorge
El dom, 14 ago 2022 a las 11:13, Lou Laderman ()
escribió:
> Here’s a thread from the Flex Community regarding remote relay setups to
> control power to 220v amps with some good ideas.
>
>
>
Here’s a thread from the Flex Community regarding remote relay setups to
control power to 220v amps with some good ideas.
https://community.flexradio.com/discussion/8023204/remote-220-240vac-switch#latest
I built a remote 220v power switch using this relay from Amazon
Hello!
when you use the KPA1500 remotely, the power is always on. With which it
could spend several years on continuously. Could this be harmful to
the power supply?
Is it thought and designed to withstand this?
Is there a way to turn the power on and off remotely?
thanks!
--
73,
Jorge
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list:
Dwayne,
I believe Elecraft has replacement switches.
You can try reversing the switch, only one side is used - remove it and
turn it around.
73,
Don W3FPR
On 3/13/2022 11:25 AM, Dwayne Barbee via Elecraft wrote:
The power switch for my KX1 has stopped working, does anyone know
The power switch for my KX1 has stopped working, does anyone know of a
reputable source for a replacement? Thanks!
Dwayne KE4RVT
Sent from my iPhone
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help:
There are situations when running a driver at it full output is
desirable. Or when running at very low output is not as stable.
Two examples:
I have a 6-dB 30w attenuator on the input of my 2m 1500w LDMOS Amp
(MRF1K50H) which ensures that my 25w transverter will not overdrive the
amp. The
On 1/1/2022 1:12 PM, j...@kk9a.com wrote:
I follow the SPE Expert list and I never understood their reasoning for
running 100 watt radios at full power and relying on ALC to control the
output. I never use ALC. I thought relying it can cause splatter.
YES!
I I am a big fan of the TelePost
On 2022-01-01 13:12, j...@kk9a.com wrote:
I follow the SPE Expert list and I never understood their reasoning for
running 100 watt radios at full power and relying on ALC to control the
output. I never use ALC.
*** I am building a 600W LDMOS linear. An input of 5-8 watts gives full
output.
I follow the SPE Expert list and I never understood their reasoning for
running 100 watt radios at full power and relying on ALC to control the
output. I never use ALC. I thought relying it can cause splatter. There are
a lot of failed LDMOS posts on the SPE list.
If the SPE amp watt meter is
I think in today’s technology, any amp recommending to run the radio at full
power and expecting the ALC to protect the amp is a joke. It may not be fast
enough to protect the LDMOS device.
SPE America has a history of pointing the finger at the radio having a power
overshoot as the cause of
After reading all the comments on this thread, I think that
Skip, K6DWG and Bob, K4TAX have the best theory of what
happened. Careful reading of the SPE 1.3K manual indicates that
the power output of the amp is sampled between the amp and the
internal tuner and that the recommended tune power
On 12/31/2021 2:35 PM, Al Lorona wrote:
I think N7WS has shown that when that window transmission line gets wet, its
loss goes way up.
Yes. Excellent lab-quality experimental work done many years ago. It's
in one of the ARRL Compendiums of technical papers. He set up runs, got
them wet, and
Happy New Year,
I think N7WS has shown that when that window transmission line gets wet, its
loss goes way up. So some of the change you are seeing in rain/snow conditions
could be due to this higher loss.
Al W6LX/4
>
> My experience with antenna's changing due to moisture is with my
>
feedline/
>
> 73
> Lyn, W0LEN
>
>
> -Original Message-
> From: Bob McGraw [mailto:rmcg...@benlomand.net]
> Sent: Tuesday, December 28, 2021 12:27 PM
> To: l...@lnainc.com; elecraft@mailman.qth.net
> Subject: Re: [Elecraft] Output power being eaten
>
> Yes, I agree that tr
://www.trueladderline.com/w7fg-design-600-ohm-open-wire-feedline/
73
Lyn, W0LEN
-Original Message-
From: Bob McGraw [mailto:rmcg...@benlomand.net]
Sent: Tuesday, December 28, 2021 12:27 PM
To: l...@lnainc.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Output power being eaten
Yes, I agree
cGraw
Sent: Monday, December 27, 2021 7:36 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Output power being eaten
I doubt that ice on the antenna would have any effect in terms of
increased loss. However, I would expect the resonant frequency to
change and thus the need to adjust the
To: elecraft@mailman.qth.net
Subject: [Elecraft] Output power being eaten
I doubt that ice on the antenna would have any effect in terms of
increased loss. However, I would expect the resonant frequency to
change and thus the need to adjust the tuner. If it is and ATU /
automated tuner
The ice should not have a significant effect on your signal strength. With a
KW, everyone should hear you fine unless there is a water/ice issue with
your center insulator. Ice is a poor dielectric, it will make your dipole
wire electrically longer so a tuner will likely be needed to make your
...@mailman.qth.net wrote:
Message: 21
Date: Mon, 27 Dec 2021 14:10:25 -0800
From: Fred Jensen
To: Elecraft Reflector
Subject: Re: [Elecraft] Output power being eaten
Message-ID:<8c012d97-f62d-b342-4ec3-20db2e8f5...@gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
I doubt that pogonip o
I doubt that pogonip or even solid ice on your antenna would have major
effects [well, except for weight]. Ice forming from water directly from
the sky is a pretty good insulator. We had a very large Log-Periodic on
the roof of the hangar at my first USAF assignment in the remote
northern
I didn't have a good night in the K1USN Slow Speed Test. I started
more-or-less on time and tried to answer CQs. None of the
stations I tried
could hear me. My SPE 1.3K amp said I was putting out about a kilowatt,
although the antenna tuning on my normally low SWR 40M dipole
needed to be
: Jim Brown
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K2] Cheap power supply for KBT2
Message-ID:
<89d0d3d2-6e46-4327-c5c3-555460f25...@audiosystemsgroup.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
On 11/24/2021 6:29 AM, Chris wrote:
I use this, and it
:06 -0800
From: Jim Brown
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K2] Cheap power supply for KBT2
Message-ID:
<89d0d3d2-6e46-4327-c5c3-555460f25...@audiosystemsgroup.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
On 11/24/2021 6:29 AM, Chris wrote:
On 9/23/2021 6:34 AM, Lyn Norstad wrote:
Yes, there are many reasons to match as well as possible
Elecraft engineer K6XX has shown that it is critical to match antennas
to the output devices to minimize IMD (clicks, splatter). In tube amps,
this is done by a variable pi or pi-L network; with
PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 Power Level
"Would you care to share your KPA500 power measurements at each of those
drive levels (and test mode used)?"
If you receive this data set be sure you understand that dissipation,
heating, and efficiency will b
The answer to Lyn's question was via a private response with attached
EXCEL file. That file is available except it "won't take" here on the
discussion group.
73
Bob, K4TAX
Date: Wed, 22 Sep 2021 14:14:47 -0500
From: "Lyn Norstad"
To: "'Bob McGraw'",
S
"Would you care to share your KPA500 power measurements at each of those drive
levels (and test mode used)?"
If you receive this data set be sure you understand that dissipation, heating,
and efficiency will be strongly dependent on the complex impedance of the load.
I have previously shared
: Sunday, September 19, 2021 9:22 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA1500 Power Level
I've said this for years, even with tube type amplifiers. One
exception, to which I'm aware, is the Johnson Thunderbolt which uses a
variable L along with variable C for the input components
And how did you come to the conclusion of no overshoot?
73
Bob, K4TAX
On 9/21/2021 8:48 AM, Salvatore ["Ted"] K2QMF wrote:
I have a Yeasu FTdx5000 and an FTdx101MP.
Both are driving Elecraft KPA1500's.
The driver power is reduced to about 35 Watts on both! I have no over
shoot with either
Buried in this thread:
https://groups.io/g/TS-890/topic/kenwood_ts_890s_audio_chain/74266007?p=Created%2C%2C%2C20%2C2%2C0%2C0=1
is this:
Dear Sir,
Please accept our excuses for keeping you waiting.
As I mentioned last time due to the COVID-19 our staff in Japan is till the end
of this month
On 9/21/2021 6:48 AM, Salvatore ["Ted"] K2QMF wrote:
have a Yeasu FTdx5000 and an FTdx101MP.
Have you looked at splatter for these rigs? I don't know about these
models specifically, but other recent vintage Yaesu rigs have had awful
splatter, as heard/measured on my K3/P3/SVGA. Any time I
jerry
To: Bob McGraw
Cc:elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 Power Level
Message-ID:<6f2e7001d988f150b7f0f39517b3d...@tr2.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
On 2021-09-19 19:47, Bob McGraw wrote:
> Based on personal experience and observations w
the overshoot issue. The issue can be resolved.
ICOM, Kenwood, Yaesu.are you listening?
73
Bob, K4TAX
Message: 8
Date: Mon, 20 Sep 2021 09:21:15 -0700
From: jerry
To: Bob McGraw
Cc:elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 Power Level
Message-ID
Message: 8
Date: Mon, 20 Sep 2021 09:21:15 -0700
From: jerry
To: Bob McGraw
Cc:elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 Power Level
Message-ID:<6f2e7001d988f150b7f0f39517b3d...@tr2.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
On 2021-09-19 19:47, Bob McGraw wrote:
On 9/21/2021 6:26 AM, Bob McGraw wrote:
Kenwood, ICOM, and Yaesu...are you listening?
Of course not. Elecraft (and in the old days, Ten Tec) are/were unique
in that regard.
73, Jim K9YC
__
Elecraft mailing list
Home:
I have a Yeasu FTdx5000 and an FTdx101MP.
Both are driving Elecraft KPA1500's.
The driver power is reduced to about 35 Watts on both! I have no over shoot
with either rig!
Do not use ALC!! Lower the drive power.
No issues! Works Great...
K2QMF
On 9/21/2021 9:38:49 AM, jerry wrote:
On
On 2021-09-21 06:26, Bob McGraw wrote:
Not really, 6 dB of attenuation rated at 100 watts. The challenge is
switching it out on receive.
*** Not so bad if you build it INTO the linear - so it would be inside
the
existing relays. But yeah - it's a shame to waste all that power and
heat the
Not really, 6 dB of attenuation rated at 100 watts. The challenge is
switching it out on receive.
But the real challenge is to buy a transceiver that doesn't overshoot at
reduced power. Neither my K3S, my Tentec Eagle, nor my Omni VII have
the issue. Other companies have or need to
On 2021-09-19 19:47, Bob McGraw wrote:
Based on personal experience and observations with another ham radio
brand and company, it is most often the case that power overshoot is
likely to occur when the transceiver is operated at reduced power.
Namely to drive a power amplifier.
*** So I
, lousy transmitter.
73
Bob, K4TAX
Message: 14
Date: Sat, 18 Sep 2021 19:15:51 -0700
From: Jim Brown
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 Power Level
Message-ID:
<43ba24ec-6da1-8c44-e0fc-ed878090a...@audiosystemsgroup.com>
Content-Type: text/plain; charset
,
dissipation, and gain on all bands, 160M - 6M.
73
Bob, K4TAX
Message: 5
Date: Thu, 16 Sep 2021 20:26:44 -0400
From: Steve Hall<99sun...@gmail.com>
To:elecraft@mailman.qth.net
Subject: [Elecraft] Subject: KPA1500 Power Level
Message-ID:
Content-Type: text/plain; charset=&quo
Jerry ...
In either of the failures, were you controlling transceiver output through ALC
or, as it sounds, manually?
73,
Kent K9ZTV
> On Sep 18, 2021, at 8:48 PM, Jerry Kirshenbaum wrote:
>
> re: it'd pay to review the SPE
>
> In May 2021 I bought a SPE 1.5K-FA 2nd generator new from
My wife won $1000 off an Expert amplifier at Visalia maybe 5
years ago. I ended up getting a 1.3K because I had noticed many
DXpeditions using it. Mine is still working well, knock on wood.
I run in on 120V at theMedium power setting. I get 700-800 watts
out. I'm always thinking of selling it
I believe the SPE 1.5K-FA uses one 1800W Mosfet and the KPA1500 uses two
1400W Mosfets. In general, the KPA500 and KPA1500 are more robust than most
of the competitors. I've made mistakes a few times with my KPA500 and it is
still ticking. Everyone I've talked to with an ALS-600 has blown the
Does Expert publish a list of radios they will not warranty their amp on?
Mike va3mw
> On Sep 18, 2021, at 10:16 PM, Jim Brown wrote:
>
> For a long time, W8JI, who has designed ham power amps, has observed that
> some JA rigs have this problem. And for a long time, the mfrs have failed to
For a long time, W8JI, who has designed ham power amps, has observed
that some JA rigs have this problem. And for a long time, the mfrs have
failed to fix them. Just like they have taken decades to fix clicks, and
at least one (Yaesu) has been building rigs with lots of splatter on SSB.
73,
re: it'd pay to review the SPE
In May 2021 I bought a SPE 1.5K-FA 2nd generator new from the distributor in
Texas. I’ve been using a SunSDR2 DX 100W transceiver while I wait to receive my
K4D. The 1st time the finals blew may have been operator error. Subsequently, I
discovered that the
/
Free. Easy install. No registration. Use it once (or more) and throw it
away.
-larry (K8UT)
-- Original Message --
From: j...@kk9a.com
To: elecraft@mailman.qth.net
Sent: 2021-09-14 21:35:15
Subject: Re: [Elecraft] KPA1500 Power Level
There is some information on KPA1500 efficiency
On 9/14/2021 7:13 PM, Peter Hall wrote:
it'd pay to review the SPE and other offerings both in technical and support
terms.
In my limited contact with SPE amps, I'd say the Elecraft amps are
substantially cleaner. One of our neighbors was getting reports of a
dirty signal on 6M, so one of
), the overall experience was very average.
73, Peter (VK6HP).
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Barry Simpson
Sent: Wednesday, 15 September 2021 6:15 AM
To: Elecraft Mailing List
Subject: [Elecraft] KPA1500 Power Level
I have had a quick look
There is some information on KPA1500 efficiency in the archives:
http://mailman.qth.net/pipermail/elecraft/2018-August/259502.html
John KK9A
Barry Simpson vk2bj wrote:
I have had a quick look through the KPA1500 manual and could not find any
reference to running the amplifier at a lower power
Mailing List
Subject: [Elecraft] KPA1500 Power Level
I have had a quick look through the KPA1500 manual and could not find any
reference to running the amplifier at a lower power level than the rated
1,500w.
Can anyone comment on the implications (eg temperature, efficiency and IMD)
of running
I use mine on 30M @ 200W. Efficiency isn’t too as good, but that is a
characteristic of a SS amp.
73,
Bill WE5P
Comfortably Numb
> On Sep 14, 2021, at 18:16, Barry Simpson wrote:
>
> I have had a quick look through the KPA1500 manual and could not find any
> reference to running the
I have had a quick look through the KPA1500 manual and could not find any
reference to running the amplifier at a lower power level than the rated
1,500w.
Can anyone comment on the implications (eg temperature, efficiency and IMD)
of running a KPA1500 at say 500w by simply reducing the drive
After posting the question I found this on page 102 of the manual:
RTTY/Data Operation
Since some RTTY/Data mode duty cycles approach 100%, you should reduce
power to about 5 watts or avoid transmitting at 10 watts for longer
than 1-2 minutes at a time. (Power levels above 10 watts are not
1 - 100 of 2886 matches
Mail list logo
