ystem has not changed your sound device
> settings. Win 10 is bad about that (ask me how I know!)
>
>> On Mon, Dec 2, 2019 at 12:24 PM Bob McGraw K4TAX wrote:
>> Add to my earlier. You may need to adjust levels as previous version and
>> this one will be different.
>&g
Add to my earlier. You may need to adjust levels as previous version and this
one will be different.
Also suggest you use CAT control and not VOX as CAT is not affected by audio
levels.
73
Bob, K4TAX
Sent from my iPhone
> On Dec 2, 2019, at 11:23 AM, cx...@4email.net wrote:
>
> Hola,
>
Check SPKR level on the computer. Also check PWR slider on WSJT-X.
Check Audio tab on WSJT, F2 Menu, Audio tab to see that both Transmit and Tune
boxes are checked. This remembers the settings per band.
73
Bob, K4TAX
Sent from my iPhone
> On Dec 2, 2019, at 11:23 AM, cx...@4email.net
My K3S has a bit of a slow power rise after any power change. I wouldn't say
it takes a minute, but I was told this occurs as the power management system
makes adjustments. This is done in order to prevent ALC overshoot.
With the ATU bypassed I have my TUNE power set to 20 watts. That is
In looking at the schematic, I see the fan is controlled by a MJE182
{Q5}. If this transistor shorts the fan runs at full speed. I didn't
see a relay in the circuit, but I could have missed it.
73
Bob, K4TAX
On 11/26/2019 3:29 AM, Eric Norris wrote:
As Jack Brindle noted (and he would
Does the mains switch on the rear panel shut the fan off?
I would next reload the firmware.
Bob, K4TAX
Sent from my iPhone
> On Nov 25, 2019, at 8:50 PM, VK5GR wrote:
>
> FAN CTL = NOR
>
> FANs are idle while the amp is turned on - amp ambient temp was 27C at the
> time (it was powered
What is the value in the menu for FAN CTL? If at NOR then the fan
should be off until the temp hits about 50º C. It will then increment
up one speed value about every 5 degrees temp increase. What is the
TEMP value showing? Should be about room temp or 22 to 25 C
73
Bob, K4TAX
On
With the KPA3A / 100 watt amp active, which switches in at 12 watts, the
LPA then runs about 1 to 5 watts. The issue I encountered was running
the KPA3A / 100 watt amp, at the lower end of the power range being 15
or so watts. I encountered two failures of the KPA3A amp module.
I now stay
I learned my lesson running 12 to 15 watts or so having to replace the KPA3A
twice. I now run 20 to 25 watts driving my KPA500 to rated output. Be it CW,
SSB or digital modes. Otherwise it is 100 watts when not running the KPA500.
Running conservative power doesn't get it.
Bob, K4TAX
That is correct. The current FCC regulation requires that an amp be
limited to 15 dB of gain.
Therefore, 900 watts out with 11 watts of drive is 19.12 dB gain.
Even with 800 watts out and 11 watts of drive the gain would be 18.61
dB. Not exactly legal in the USA. dB = 10log(p1/p2)
Why not add a 1 dB or 2 dB attenuator in line at the input of the amp?
That would allow for a bit higher drive power from the K3S. Three
carbon resistors will make a nice Pi attenuator.
73
Bob, K4TAX
On 11/21/2019 9:42 AM, j...@kk9a.com wrote:
I have operated RTTY with my K3S in the 11
I've been doing a bit of looking at SWR indications. The numbers are
factually frightful. With 100 watts forward power and 0.25 watts
reflected the SWR is 1.1:1. And with 500 watts forward and 1.25 watts
reflected the SWR is still 1.1:1. I believe that says 0.25% of the
power is being
Yes and I have trained my tuner to use the same frequency on different
antennas. Thus when I switch antennas it does not require any
re-tuning, only push the ANT selector for the preferred antenna of
choice at the moment.
73
Bob, K4TAX
On 11/18/2019 7:18 PM, Jim Brown wrote:
On
At risk of starting a FIRE storm here in the group, why not CORRECTLY
configure the ALC between the amp and radio. Just remember it is not a
power control application but no different than the normal ALC in your
radio. You do use that don't you? And you can see the amp ALC on the
K3S display
in the manual.
73!
Jack, W6FB
On Nov 17, 2019, at 6:58 AM, Bob McGraw K4TAX wrote:
I need to null the SWR detector on my KPA500. I've not found any adjustment
procedure as such. And from the schematic, there is none.
I do have a rather precise Bird 50.5 ohm dummy load. I see SWR values higher
I need to null the SWR detector on my KPA500. I've not found any
adjustment procedure as such. And from the schematic, there is none.
I do have a rather precise Bird 50.5 ohm dummy load. I see SWR values
higher than 1:1 on the LED display and also on the LCD display on higher
frequency
Bill:
You mention a good point..cables and connectors.
To that end, I find that just inserting a multipin plug into a connector
is not good enough. I know those retaining screws are a pain to deal
with, but they are there for a very valid reason. They assure the plug
is fully engaged
And if you are using a beam / directional antenna, the position of the
antenna may affect the RF level at the operating position.
73
Bob, K4TAX
On 11/13/2019 11:04 AM, N2TK via Elecraft wrote:
I was on 20M at the time the problem arose. Will watch to see if it happens
again as to what band
Using Windows 10 Pro, I do use the computer for other audio activities,
editing music, choir performances, listening to music and such. This
will change the audio parameter settings of Windows. Thus one needs
to understand the various selections and audio level values for the
computer,
Bob, K4TAX
On 11/12/2019 2:37 PM, Bob McGraw K4TAX wrote:
Go to the Config Menu and check BND MAP settings. This says you
have blocked or mapped 14.0 out. See page 58 of the manual.
73
Bob, K4TAX
On 11/12/2019 1:50 PM, Jim Danehy wrote:
I recently moved my K3, KPA 500 and KAT 500
Go to the Config Menu and check BND MAP settings. This says you have
blocked or mapped 14.0 out. See page 58 of the manual.
73
Bob, K4TAX
On 11/12/2019 1:50 PM, Jim Danehy wrote:
I recently moved my K3, KPA 500 and KAT 500 to a new place in my home. It was
working perfectly before the
As indicated on my K3S current display, at a PWR setting of 100 watts,
to a 50 ohm dummy load:
160M = 18.0A
80M = 17.6A
40M =16.0A
30M = 16.4A
20M = 20.2A
17M = 20.2A
15M = 17.0A
12M = 17.7A
10M = 17.0A
6M = 18.8A
I'd consider these values to be typical and normal. Actual power
Measurements on my K3S into a 50 ohm load, at 100 watts PWR setting did
show the current does vary from band to band. I found that 20M and 17M
were the highest at 20.2 amps as indicated by the current display in the
K3S. The lowest current was 16.0 amps on 40M. I would consider this
to be
Connect the KPA-1500 via the ACC cable and thus free up the PTT
output. The system is very smart and works exceptionally well. I
use this method with my KPA500 and KAT500.
The PTT Out is connected to the VHF transverter.
73
Bob, K4TAX
On 11/7/2019 10:44 AM, N4ZR wrote:
I need to be
Check all connectors. I've found that connectors that just "sit" and
are never moved will oxidize and prevent signal flow. They rely on a
mechanical connection only. Just unplug and re-plug 2 or three times
for each one.
73
Bob, K4TAX
On 11/7/2019 10:12 AM, Mike Flowers wrote:
Hi
As stated earlier, a radio with internal power supply capable of 90V to
250V and run the PA devices from 48 to 60 volts for a 100 watt radios.
And for mobile or portable, a 12VDC to 120VAC converter, makes it a 12V
radio. I use a 1000 watt pure sinewave converter on our travel
trailer. The
Build radios with internal supplies capable of 90V to 250V and the PA's
running 48 to 60 volts for 100 watt radios. The continued insistence
on 12V radios should be limited to mobile or portable type and
configured radios.
73
Bob, K4TAX
On 11/4/2019 3:31 PM, Graydon (N7RXL) wrote:
I'm
I suppose I am the "Bob" you refer to. The section in Rob's article on
Odd-Order Intermodulation he clearly explains "worse".
Our receivers have gotten much better over the years but unfortunately
our transmitters and amplifiers have gotten worse. To quantify, the ARRL
published a
Clarification, Stainless Tower company builds steel towers. They are NOT
stainless steel.
We had a 350 ft Stainless tower at WDXN in Clarksville TN. It was a challenge
to climb as the horizontal members were 3ft apart. That's a tall step.
Bob, K4TAX
Sent from my iPhone
> On Nov 3, 2019,
It is wise to listen to CW stations across the band and determine what
speed they are running. Then operate at the speed that MOST of the
stations are using. This will get the MOST responses.
I used the trial version of CW Skimmer for this purpose recently. I
have other software that
Rohn tower hardware is hot dipped galvanized steel. I'd take their
knowledge over any "tower guy" or any other person for that matter.
Remember, your tower and perhaps someones life may depend on your tower
hardware, use and installation.
73
Bob, K4TAX
On 11/2/2019 9:59 AM, John
I find them to be relative. I adjust for about 10dB indicated. The CMP value
is 15 or so.
Bob, K4TAX
Sent from my iPhone
> On Nov 1, 2019, at 10:03 PM, Rich wrote:
>
> Are the K3S compression values 0 - 40 equal to DB or are they just arbitrary
> numbers?
>
> Just curious what those
Dave et al:
I have the 6.0 kHz AM filter in my radio. Yes the DSP BW goes to 5
kHz. However in using the P3 I find the total bandwidth as shown to be
about 8 kHz or +/- 4 kHz of center frequency. In synchronous AM you
will have 4 kHz BW either USB or LSB depending the Shift setting.
We used K3S radios at a Field Day site. Operated 2 radios on the same
band with antennas less than 50 yards apart. No issues. Just be sure
you use the ATTN and set the RF Gain correctly <
In writing this, I do so, saying that I find the method to be excellent
and reliable and repeatable with regard to HF radio receiver operation
for all modes.
In general it seems that hams have the more incorrect notion or idea
where more gain is needed to hear a weak signal. To some degree
You can reduce the LIN OUT level via the Config menu in the radio.
Normal is 010. I would back that value down.
I use Windows 10 thus I have full control of all levels via the
computer. Also I use the USB connection between the radio and computer
and do not need a Signalink.
I can't
Likewise when we lived in a condo in Pompano Beach, FL. I had a 75M
loop around the parapet wall on the roof. And I managed to get on the
board and got permission. After all one of the starch objectors wanted
something for him self. Thus a "quid pro quo" was arranged. Funny how
that
Bill:
Glad to see you post this fact. Hams have had it wrong and doing it
wrong for years, because someone said so. Many hams seem to have less
than zero knowledge on the topic. Oh, less than zero knowledge is
knowledge that is not correct.
Same is true when one uses 450 ohm line,
Just purchase the correct cables from Elecraft. This approach works
100% of the time.
Go cheap, dig out your own or roll your own. Then trouble shoot the
issues. How much money and time was saved?
For a few dollars saved, it isn't worth it.
73
Bob, K4TAX
On 10/27/2019 4:51 PM, Gmail
I change bands from the computer running WSJT-X. The K3S follows, the
KPA500 follows and the KAT500 follows. All seems good to me. I do have
the KPA500 go to STBY on band change. This is a user menu item.
I don't push buttons on the KPA500 to change bands.
73
Bob, K4TAX
On 10/27/2019
Except for my 6M yagi, all of my antennas are non-resonant antennas.
My favorite is the 256 ft center fed wire {resonant at 1.825 MHz} with
a balanced feed. The balanced feed runs from the feed-point on the
antenna all the way to the hybrid Guanella 4:1 balun that sits on the
shelf just
And you believe everyone else follows all the rules? Two minutes early and
stop 2 minutes early and 3KW PEP. Get your head out of the sand. There is no
honor among thieves.
Bob, K4TAX
Sent from my iPhone
> On Oct 19, 2019, at 9:29 PM, j...@kk9a.com wrote:
>
> I cannot imagine starting
For logging purposes +/- a few seconds is relatively unimportant. For timed or
sequence transmissions 0.5 seconds seems adequate. I see on reason to maintain
microsecond timing.
Remember, it's only a hobby.
Bob, K4TAX
Sent from my iPhone
> On Oct 19, 2019, at 2:19 PM, Tox wrote:
>
>
I certainly use the clock on my K3S. It is UTC while the computer is
local time. The computer syncs to NTP servers. The K3 Utility makes
it easy to update the clock as needed.
I am very careful what and how I connect things to the internet. I will
never have any of those things, Alexa or
There is a very nice Elecraft group at the following link:
https://groups.io/g/Elecraft-K3
Group Description
For people interested in the Elecraft K3 and K3S radios. Share
information and learn about these awesome radios from the people that
operate them.
When joining the group,
The only issue I've encountered with single band antennas, to staff a
Field Day site to operate 2 or 3 stations per band, and 5 bands, there
needs to be some 10 to 15 antennas erected. Where as a single 135 ft
wire with a balanced feed system, a good 1:1 balun, and a good tuner
{not one of
I used my Johnson Matchbox at our Field Day event about 3 years ago. I
went through each band and several frequencies on each band and compiled
a written chart identifying the settings for each band/frequency.
After 2 hours of trying to work stations on 20M, the radio failed and
they
I thought a Band Pass Filter at each station resolved that issue.
73
Bob, K4TAX
On 10/10/2019 5:27 PM, Ken G Kopp wrote:
Well-said, Don.
73!
Ken Kopp - K0PP
On Thu, Oct 10, 2019, 16:23 Don Wilhelm wrote:
All this talk of multi-band antennas for Field Day ignores the problem
of
Scott:
The TEXT DEC level {Text Decode} is set too sensitive and/or the RF Gain
is too high. I use #3 for the TEXT DEC sensitivity on most bands,
depending on noise. And the RF Gain is reduced such that the CWT bar
only flashes on a clean signal. Getting * and E's is an indication the
Change the default tune frequency on WSJT to something other than 1500 Hz.
1600 or 1650 Hz. There is a beat between the ALC indicator and 1500 Hz.
Appears as a pulsing and makes the level difficult to adjust.
Bob, K4TAX
Sent from my iPhone
> On Oct 7, 2019, at 4:36 AM, Ken Chandler
e IF being pulled down by the sdr. DXEngineering sells the
Clifton Z1. That adds about 6db of gain, but maybe the buffering
that it does has an even bigger effect.
On Fri, Oct 4, 2019 at 2:18 PM Bob McGraw K4TAX <mailto:rmcg...@blomand.net>> wrote:
In a word, YES. I find that
In a word, YES. I find that to be true with my K3S as well as other
brands/models of radios. Thus you'll need about 20 dB of gain in the
form of a preamp between the IF output and the QSR receiver.
73
Bob, K4TAX
On 10/4/2019 12:57 PM, Fred Massey wrote:
Some. I was planning on sending
Thermal lag exists and likely always will. The hysteresis is reasonably
adequate in the present configuration.
I find no objection to the performance of the present method of cooling.
Bob, K4TAX
Sent from my iPhone
> On Oct 2, 2019, at 9:46 AM, Don Wilhelm wrote:
>
> Bob,
>
> The
soon as the rig
> goes into TX would help considerably and allow things to go back to quiet
> in RX.
>
> 73, Bob, WB4SON
>
>
>> On Tue, Oct 1, 2019 at 4:58 PM Bob McGraw K4TAX wrote:
>>
>> For SSB voice operation and CW operation I leave the fan speed at
>
For SSB voice operation and CW operation I leave the fan speed at
NORMAL. For digital modes, which all have a higher duty cycle, I
usually set the fan speed to 1. I do find the fan speed increments up
and down as needed and as driven by the temperature. When running 400
to 500 watts most
I own 4 ham radio groups and moderate 1 ham radio group and belong to
about 4 others. Life is what you make it in the world of "list
servers". If you hate it or one of them, then it is likely the way
one has it configured for their needs. "It ain't rocket science".
73
Bob, K4TAX
Phil et al;
My factory built KPA500 did a good be of cracking and popping for 3 or 4
months when first received. But it has stopped. Guess all the metal
parts settled into a comfortable position and all is now well. I
considered opening it up, tightening or loosing bolts and screws.
My K3S performs as indicated below in FSK mode but does work as expected
in AFSK A mode. The external PTT switch, I use a foot switch, does put
the radio in transmit in FSK mode and does transmit a tone related to
mark/space.
73
Bob, K4TAX
On 9/29/2019 10:40 AM, Peter Chamalian wrote:
Thanks for sharing and glad you were able to resolve the issue. That must have
been one heck of a magnetic field.
Bob, K4TAX
Sent from my iPhone
> On Sep 29, 2019, at 8:18 AM, Conrad PA5Y wrote:
>
> Gentlemen I have cured the problem.
>
> The answer came as a result of Jim's comments.
>
Yes and without proper lightning protection or static build-up
prevention on a feedline, a nearby strike can induce 4KV+ on the antenna
and feedline. A flash-over will likely leave a carbon trace that will
be followed by a few 100 watts of RF. It only gets worst, not
better. On more than
As found posted in another group. Stimulated thinking and as quoted.
73
Bob, K4TAX
"We need more power. I'm giving her all she's got, Captain! She cannae
take anymore.
I'm sure your Scottish ancestors are rolling in their graves right now, but in
our community of radio amateurs we have
Check for burn marks or carbon traces, both on the inside and outside, of the
SO-239 connectors. These may look good with the antenna analyzer but fail
under power.
I've also had PL-259's arc from center pin to shell on the inside. These
required removal/ disassembly of the coax in order to
that was it Bob and Wes, it was set to 001!
Thanks!
Conrad PA5Y
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Bob McGraw K4TAX
Sent: 22 September 2019 22:44
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 AGC off mutes audio?
Check the AF LIM settings
Check the AF LIM settings. {page 57 in the manual} Typical value is
NOR 030.
73
Bob, K4TAX
On 9/22/2019 2:42 PM, Conrad PA5Y wrote:
Hello I have a K3S with the latest firmware. I use it on EME in fact last night
was the first time. It works well but for EME I prefer to operate with the
-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bob McGraw K4TAX
Sent: Monday, September 16, 2019 8:09 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 original - ALC erratic
With my K3S I do find there is a relationship or i
I find that with my K3S, a tone applied that is divisible by 500 {500
Hz, 1000 Hz, 1500 Hz, 2000 Hz, 2500 Hz} or any tone likewise divisible
by 600 or multiples there of will cause the ALC indication to fluctuate
in a rhythmic pattern. Changing the tone frequency as little as +/-3
Hz
With my K3S I do find there is a relationship or interaction with the
scan rate of the ALC display and the frequency of the tone supplied by
FT-8. Specifically 1500 Hz will appear to have fluctuating ALC display
while the actual level is not changing. By setting the tone, TUNE is a
good
A 50 ohm dummy load. There's never any noise, never any QRM, the
frequency is always clear, and always a 1:1 SWR. Of course getting a
DXCC is much more of a challenge.
73
Bob, K4TAX
On 9/13/2019 2:25 PM, rv6amark via Elecraft wrote:
Re: "September has been fairly quiet. Only around
, 11:51 AM Bob McGraw K4TAX <mailto:rmcg...@blomand.net>> wrote:
Announced at Tokyo Ham Fair
https://qrpblog.com/2019/08/icom-ic-705-hf-vhf-uhf-portable-transceiver-announced/
And several other places if you google it.
Will compete with the KX2/KX3
30kHz
Announced at Tokyo Ham Fair
https://qrpblog.com/2019/08/icom-ic-705-hf-vhf-uhf-portable-transceiver-announced/
And several other places if you google it.
Will compete with the KX2/KX3
30kHz to 144MHz + 70cm band
10w on 13.8v, 5w on internal battery
nice panadapter/sweep that they use
Andy et al:
With the station configured as shown in the KAT500 manual, page 5 Figure
1, when operating a digital mode or any mode for that matter, and the
amp is in STBY the K3S is delivering the power as set by the PWR
control. Normally 100 watts. When the KPA500 is then switched to
omponents were found to be
defective, and one was actually missing.
I’d be curious as to how “missing” happens … on a totally factory built unit.
73
Lyn, WØLEN
-Original Message-----
From: Bob McGraw K4TAX [mailto:rmcg...@blomand.net]
Sent: Monday, August 05, 2019 7:14 PM
To: l...@ln
A point of concern when using a non-Elecraft transceiver, be sure to set
the correct value of power from the transceiver to the amp when the amp
is active in operate mode I find that 20 to 25 watts is adequate to
drive my KPA500 to rated output. With a different transceiver, I have
Using the K3 Utility be sure the filters and modes are correctly
selected. For AM you will need either the 6 kHz or 13 kHz active and
set one of those for AM mode for TX and RX.
73
Bob, K4TAX
On 8/31/2019 8:13 PM, Rick Robinson wrote:
Sounds like the AM mode has been disabled in the menu.
My KPA500 runs from a low of 35% to a high of 55% depending on power.
Lower power is least efficient. Thus I always run close or at maximum
rated power. Also the load impedance will affect efficiency.
73
Bob, K4TAX
On 8/29/2019 2:04 PM, John Simmons wrote:
No one has mentioned
Has anyone collected IMD data on the different version of KPA3A amps?
I seem to recall measuring IMD when I first got my K3S, s/n 10163.
Since that time I' have experienced 2 failures of the KPA3A in my
radio. Elecraft replaced the last one with a newer "more stable"
version. I do run
Equalizers introduce phase shift. Even the very best ones do that.
Thus for a phase shift audio signal, either transmitted or received, use
of any EQ can and will introduce phase shift in the audio path. It is
not at all advisable to have this occur with digital signals.
It is highly
I find a lot of the opposite sideband splatter is originated from
mis-tuned amplifiers or amplifiers which are driven too hard. If it
isn't "linear" it is a splatter generator. And linear means just
that, linear. For an amp to be linear, it must amplify all signal
levels the same amount.
We've made great technical strides in receivers. Transmitters, well
they are best described still as "out house" technology. Nothing has
changed of significance in 25+ years. In looking at my P3 and SSB
signals on the bands, there are lots and lots of really bad signals.
Yet I most
Does this also work the same for the KAT500? I've not tried it.
Bob, K4TAX
Sent from my iPhone
> On Aug 28, 2019, at 5:56 PM, HB via Elecraft wrote:
>
> Me too!!
>
>> On Aug 28, 2019, at 5:32 PM, Jay Rutherford wrote:
>>
>> Ordered mine!
>>
>>> On Wed, Aug 28, 2019, at 16:40,
N.S.
I typically run my KPA500 fan on #1 when operating FT-8. It will ramp
up to #3 when the temp reaches 60°C and during extended exchanges, but
quickly ramps back down to #2. I don't find this at all
objectionable. I've never seen the TEMP above 60°C or so. And at
#1 the fan
I'm keeping my K3S.I'll decide on a K4 next year.
Bob, K4TAX
Sent from my iPhone
> On Aug 26, 2019, at 5:33 PM, Charlie T wrote:
>
> Obviously, a lot of us are dumping our K3's (plural) & K3S' (also plural) as
> their prices have fallen through the floor with the introduction of the
As I've read earlier, likely an issue with the T/R switching diodes in
the amp. Contact Tech Support at Elecraft.
73
Bob, K4TAX
On 8/25/2019 8:17 AM, Mike Sanders wrote:
Probably a cable mess up on my part. Before I go through heroic
efforts to
move the operating desk can anyone offer
Has anyone actually used, observed, and measured the effect of the ALC
feature of the amp in combination with the K3/K3S with regard to output
power variation.
I do use the method and setup as suggested in the manual for both the
KPA500 and K3S with no known ill effects. The amp drives to
Well I must admit I learned something new and I was not correct in
stating the KAT500 followed the RX frequency. I normally never have
the RX and TX more than 1 kHz or less apart and rarely use RIT. Hence,
when I change the RX I'm also changing the TX and the KAT500 follows.
I did confirm
Yes and the most issues I encounter in assisting other hams is that they
DO NOT read the manuals. They take the approach "aw heck, I know how
that works". Well that is just downright wrong. Look at the
questions asked and issues presented and just how many of those are or
can be answered
Train the tuner at closer frequency intervals on the band and antenna. I use
25kHz on 160M & 80M across the entire band. Then 50kHz on all other bands.
Bob, K4TAX
Sent from my iPhone
> On Aug 21, 2019, at 7:48 PM, Robert Cunnings wrote:
>
> Yes, I don't like the way the KAT500 follows
-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Bob McGraw K4TAX
Sent: Tuesday, August 20, 2019 21:11
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 Coax size requirements
Because in the manual, page 4, item 2 states "Connect to the station 11 to 15 VDC
power s
or 5 years.
Necessary because the tuners and the amps were remoted in a closet 20 feet from
the operating desk. No problems.
Ken K6MR
From: elecraft-boun...@mailman.qth.net on behalf
of Bob McGraw K4TAX
Sent: Tuesday, August 20, 2019 12:59:11 PM
To
Carter:
The KAT500 can be {should be} powered from the radio 12V supply. I
don't suggest a separate wall wart.
The KPA500 can be powered from either 120VAC or 240VAC, your choice. It
should drive on all bands with 20 to 30 watts output from the K2 to
reach full 500 watts output from the
I'd suggest using RIG for SPLIT mode. This takes care of any issues of concern
Bob, K4TAX
Sent from my iPhone
> On Aug 19, 2019, at 5:23 AM, MaverickNH wrote:
>
> I'm using a KX2/KXPA100 at 40W on a Win10 laptop with WSJT-X 2.1.0 for FT8.
> Antenna is a G5RV at 40ft with base ATU 150ft
First depends on the version of FLFIGI. I use v4.0.5
With that I choose K3/KX3 Beta as the radio from the HamLib. 38400 baud,
1 stop. I do not have DTR or DTS checked. With my configuration I end
up with COM 5.
All works great with these values.
73
Bob, K4TAX
On 8/13/2019 8:14 PM,
From my take, the radio is in transmit mode, the ALC is showing 1 bar
and stuck in transmit. This to me says there is noise coming out of the
computer, even though WSJT-X is given the receive command. Somewhere
in this post I read that the OP reducing the computer slider eliminated
the
See XNn OFS on page 68 of the manual. This compensates fro
oscillator/multiplier errors.
73
Bob, K4TAX
On 8/9/2019 7:55 AM, Greg Troxel wrote:
John Stengrevics writes:
I have followed the calibration procedure in the manual (WWV as I
don’t have a frequency generator). On 50 MHz, I am
Just seen on E-Bay. Wow that's some mark-up!
73
Bob, K4TAX
From another source. F Y I --
73
Bob, K4TAX
An article by two well-known radio amateurs, “Tuning
Electrically Short Antennas for Field Operation,” appeared in
Microwave Journal. Authored by QEX Editor Kai Siwiak, KE4PT,
and award-winning researcher Ulrich
Harry:
Are these values on a dummy load or feeding the KAT500 or antenna direct?
I just quickly checked my KPA500 into a dummy load at 500 watts output.
The currents run from 14.0A on 20M to a low of 11.5A depending on
band. This is done with 500 watts output as shown on my Bird 43 and
Just curious on my part, with my K3S I ran FT-8 for about an hour making
1 contact after another on 20M. Power output was set to100 watts
although the external powers meters (2 different ones) show a bit more
than 100 watts. Started with PA temperature at 36°C and never saw it
go over
F Y I - I pass along from another source.
73
Bob, K4TAX
I am beginning, rather belatedly, to understand the source of the many
users reporting low Tx audio levels with the 64-bit MS Windows version
of WSJT-X. I stated above that "Pwr" slider in WSJT-X directly controls
the Windows audio
Is there an ATU involved? If so , the TX signal and RX signal are then common
to the path through the ATU.
I don't think the RX signal goes through the 100W PA.
Also consider the antenna port switching. That is common to both RX and TX
signal paths.
Bob, K4TAX
Sent from my iPhone
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