For those of you that have the KBPF3 100-400 kHz modification:
What is your no-signal S meter reading at 100 kHz?
Do you have the 220 Ufd polymer capacitor installed?
Thanks, Roger
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I discovered that I had not upgraded to the KIOB3B card which provides
a sound card and USB connection.
I'm dropping the price to $2300 accordingly.
Has virtually all options except VHF converters and KBPF3 on aux receiver.
6, 2.7 and 0.5 kHz filters in main RX; 2.7 and 0.5 hHz filters in aux
Apparently this card is no longer available. Does anyone know what the
price was?
73, Roger
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Has virtually all options except VHF converters and KBPF3 on aux receiver.
6, 2.7 and 0.5 kHz filters in main RX; 2.7 and 0.5 hHz filters in aux RX.
Went back to Mothership in Jul 2016 for TLC and upgrades.
Please contact me directly with any questions: n...@roadrunner.com
Asking $2500 plus
Unfortunately, the APF is too narrow for 160m with all the lightning noise.
As I recall, we've been promised wider selectivity choice(s) but nothing ever
happened.
73, Roger
On 6/22/2020 12:27 PM, John Gibson wrote:
Each Sunday evening, I use my K3 #820 to try to check into Kevin’s 20m
I was stationed with the Coast Guard in Kodiak, Alaska between Summer
1976 and Summer 1978. I flew up to Anchorage to take my Extra exam before
an examiner. Probably sometime in 1977.
73, Roger
On 4/29/2020 10:47 AM, Ted Roycraft wrote:
I took the test for Extra administered by an FCC
I rather liked the old Russian tank radios. Whoop de whoop de
whoop whoop de whoop.
73, Roger
On 4/24/2020 9:40 AM, Carl Yaffey wrote:
IMHO nothing beat the sound of CW from a Collins 32V3. Yeah, I’m old!
73 K8NU
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With a switchmode power supply, it would seem to be simple
to provide one or more lower voltage outputs to keep efficiency
up at lower powers (maintain same load Z).
73, Roger
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Unfortunately, illness forces me to sell my KPA1500 s/n 373.
It has Temperature Sensor and Minimum Load mods installed.
Works perfectly. There are so few of these for sale I don't
know what a fair asking price would be. I'm thinking $5000.
I'll probably also sell my K3. perhaps someone would
Thanks and Merry Christmas to all who replied.
73, Roger
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Like new. I thought I would use it more but, with my operating style, it
just sits there.
$200 Plus shipping.
73, Roger N1RJ
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I purchased one of these amps about two years ago. I expected it to require
50 to 60 watts of drive for full output but it only took half that. I was
worried about screwing up and hitting it with 100 watts from the K3 and
blowing the final transistor. I knew there was a pad on the input and I
I've tried several times to get this to work on my K3 without result. My
K3 has no AFX Mode selection.
73, Roger
On 10/21/2019 8:05 PM, Wayne Burdick wrote:
The KX3, like the K3/K3S and KX2, has full stereo audio. But it has one special
audio effects mode the others don't: binaural-audio
I was never at Ft Monmouth...took my training at Ft Gordon. We had
a small hamshack there not nearly as elaborate as k2USA. I almost
blew up the building one night. My first experience firing a furnace
using soft coal.
73, Roger
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board!
73, Roger
On 8/31/2019 9:32 AM, Roger D Johnson wrote:
It occurred to me that the KPA1500's built in tuner might be of
some help.
Here's my reasoning. If we decrease the drive power to lessen
the output power but keep the same voltage, the amplifier wants
to see a higher load impedance
It occurred to me that the KPA1500's built in tuner might be of
some help.
Here's my reasoning. If we decrease the drive power to lessen
the output power but keep the same voltage, the amplifier wants
to see a higher load impedance.
Here are the results of some quick tests:
Base line is the
no longer have the amp so I can't check the eff at those
voltages and power levels.
73, Roger
On 8/29/2019 9:03 AM, Roger D Johnson wrote:
It's interesting that the heat that has to be dissipated is pretty close
to 1000 watts in all these scenarios! Running the amp at less than full
power buys you
It's interesting that the heat that has to be dissipated is pretty close
to 1000 watts in all these scenarios! Running the amp at less than full
power buys you nothing.
73, Roger
On 8/29/2019 8:38 AM, Larry (K8UT) wrote:
Pete,
I don't run my amp at full legal limit on digital modes, but
I just did some experiments with my K3/KPA1500 combo into a dummy load.
I used my LP-700 for power measurements. Drive from K3 was set to 30W
(28 on K3 indication).
I started at 35C with PO at 1362 watts. At 70C, the PO dropped to 1277
watts...about a 6% decrease. K3 output remained steady at
This setup works fine except for 6m where the image rejection goes away.
Larry, N8LP says the NaP3 program senses when the radio goes above 48 mHz
and changes the I/Q setting to compensate. I've tried several versions of
NaP3 and none of them do this on my setup. Am I missing something in the
For an interesting discussion..."What happens to the power that's reflected?"
On 4/9/2019 3:42 PM, Al Lorona wrote:
There's always a lot of discussion about measuring SWR, low SWR values, SWR
lights not lighting up, etc. Here's something that might give you a better
'feel' for SWR.
Imagine
When I was in the military, and a pub was changed, they just sent
new pages that had the changes. That way they didn't have to re-
publish the whole thing.
Could Elecraft tell us which pages had been changed so we can print
them out without doing the whole manual?
73, Roger
I have no interest in most of the technical discussions.
Roger N1RJ
On 3/24/2019 8:40 AM, Bill wrote:
Am I correct that this is a technical group? Or, is posting space to be taken up
by non-technical discussions of which many users have no interest?
Bill W2BLC owner/user
I remember that from my Army days in the AN/GRC-26. No cat though!
73, Roger
On 3/22/2019 12:26 PM, Ken G Kopp wrote:
I had a Teletype Model 26 attached to a BC-610E. Cat slept on top for
warmth.
73 !
K0PP
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What ever happened to giving us some alternate selectivity on the APF?
73, Roger
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I can vary the selectivity from 2800 to 50 Hz with the width knob.
73, Roger
On 12/23/2018 10:08 AM, Bob McGraw K4TAX wrote:
I find the 500 Hz 5 pole filter works very satisfactory for this purpose.
73
Bob, K4TAX
On 12/23/2018 6:54 AM, Victor Rosenthal 4X6GP wrote:
Interesting! I just ran some tests on my station into Bird load; tuner bypassed:
At 50.1 mHz:
LP-700 1.06
K3 1.5
KPA1500 1.0
At 9.56 mHz (geometric mean freq)
LP-700 1.05
K3 1.1
KPA1500 1.0
At 1.825 mHz:
LP-700 1.05
K3 1.1
KPA1500 1.0
My KPA1500 looks good but K3 is off on 6m.
73, Roger
The display of the K3 is "hard coded". When it was designed, there was no
KPA1500 hence it can only read KPA500.
73, Roger
On 10/26/2018 8:13 AM, Ed G wrote:
I can’t think of a lower priority issue to have….so here is my question. I
have the KPA1500 and K3 cabled together. Why do status
I had to revert to WinXP in order to change the port assignment for the FTDI
adapter. After I finally established comms, the firmware loaded and all seems
fine now.
Just wondering why I had the "low gain ratio" error with v1.78?
73 all, Roger
I think I've bricked my KPA1500! Yesterday I installed v1.78 of the firmware.
Today I was calling a dx station on 20m and I kept getting a "low gain ratio"
error message. I thought it might be the new firmware so decided to go back
to v1.64. I downloaded the hex file from Elecraft and somewhere
Ah! LORAN C. I remember it well.
Roger CWO4, USCG (retired)
On 8/20/2018 12:54 PM, Rose wrote:
Trivia ..
The last I knew the WWVB transmitter is a "repurposed" 100KW
LORAN C TX from the closed site in ND.
73!
K0PP
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The amp arrived in fine shape and am getting familiar with all the
features. I have some questions:
Is there an input attenuator normally in-line?
I can't figure out how to manually change the L and C values for the tuner.
If these are changed, are the settings memorized?
73, Roger N1RJ
It's also fine with a reliable sound card!
73, Roger
On 7/26/2018 6:33 PM, Joe Subich, W4TV wrote:
The issue is that NaP3 does not support Airspy, SDRplay or RTS dongle
based SDRs. It's fine if one has LP-Pan with an unreliable sound card
or Fun Cube Dongle but otherwise it's rather
I have the report. 3rd order IMD ranges from approx 31 to 35db at 1000 watts
output. Not terrible but not spectacular either. I really wish they had tested
it at rated power (1300 watts). I might be very different at that point!
73, Roger
On 7/24/2018 4:03 PM, Joe Subich, W4TV wrote:
On the
I'm using the SPE 1.3K-FA at present but have a KPA-1500 on order. I like the
idea
of automatically reducing the power out of the K3 to a preset value when the
KPA-1500
is turned on. I also like the idea of having a bit more "headroom". The 1.3K
has a
1db compression point of about 1300 watts
What are users seeing for maximum power output on each band?
73, Roger N1RJ
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I was watching 6m yesterday and noticed several spurs. They were spaced 39kHz
apart. Amplitude dropped but didn't disappear when switched to dummy load.
I have the K3 with new synthesizer boards. Just wondering if anyone else seeing
something similar. IOW is it something in the K3 or external?
IIRC there was no "standard". It was an arbitrary choice by the manufacturer
which side of the filter they put the BFO crystal frequency. Nice to have a
choice with the K3!
73, Roger
On 2/14/2018 11:15 AM, Chuck Chandler wrote:
Something that bugs me just a tiny wee bit.
So, for years I
How do I load an older version back into the K3?
73, Roger
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I noticed that during the contest, that if I selected 50 or 100 Hz selectivity,
the audio would drop way down. It didn't used to be this way. I tried reloading
an earlier version of the software but couldn't figure out how to do it.
Hope this comes through, finally!
73, Roger
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I noticed that during the contest, that if I selected 50 or 100 Hz selectivity,
the audio would drop way down. It didn't used to be this way. I tried reloading
an earlier version of the software but couldn't figure out how to do it.
Hope this comes through, finally!
73, Roger
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Is the S meter supposed to read 60 over 9 when the RF gain is turned all the way
down?
Mine reads 30db!
73, Roger
On 12/13/2017 9:10 PM, Wes Stewart wrote:
I would first perform the RF Gain calibration using the K3 Utility. The
calibration program measures gain characteristics and applies
.
Try again with the bare K3 and see what happens. If you have the KAT3
installed, do an ATU TUNE into the dummy load to set the L/C components to
match the dummy load.
73,
Don W3FPR
On 10/10/2017 4:37 PM, Roger D Johnson wrote:
I'm trying to get my system set up for RTTY. I think I have
I'm trying to get my system set up for RTTY. I think I have the cabling
OK. Using MTTY I can decode signals fine but when I try to transmit,
I get no power out. The MTTY program keys the VOX and I have 5
bars of ALC but nil on the wattmeter!
Help!
73, Roger N1RJ
How ham radio has fallen. Incentive licensing, no code, and now, my computer
talks to your computer!
73, Roger
On 9/21/2017 10:58 AM, Wayne Burdick wrote:
Congratulations, Ken! How much power?
Wayne
N6KR
On Sep 21, 2017, at 4:40 AM, Ken Roberson via
Elecraft
Whilst searching for some RFI, I noticed my K3 has a sudden drop in gain
when tuning up past 3300 kHz. I have the KBPF3 installed but don't know
what frequencies the K3 switches from the normal filters to the KBPF3
filters.
73, Roger
The KPA-500 (and probably the KPA-1500) will automatically reduce the
power from the K3 to a predetermined level for proper drive and back to
the level from the power control when the amp is off.
Is there a way to invoke this magic with other amplifiers?
73, Roger N1RJ
The antenna is easy. Muting the external rx is the problem!
73, Roger
On 8/24/2017 12:00 AM, JEAN-FRANCOIS wrote:
Hi,
Is there anybody ever use an external receiver with a K3S as a second receiver…
to act as a second receiver that can share the same antenna the K3S use or
similar setup???
Let's see
Assuming the computer is running here's what I have to do:
1. Bring up Thunderbird mail program
2. Select Elecraft folder
3. Scroll down and click on the email I want to read.
For Antique Radio Forum, which I like very much, I do this:
1. Bring up ARF
2. Click on topic I want
I really like the format on Antique Radios:
http://antiqueradios.com/forums/
73, Roger
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Cebik, W4RNL, modeled two versions of the T2FT. One 165ft long and the other
100ft.
Here is what he said about these antennas:
Terminator Resistor Losses
Although transmitting uses have been made of the T2FD, its chief use appears to
be as a short wave reception antenna. In this application,
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I've just gotten interested in 6 meters but only CW and SSB. Is there any
cluster
software that lets you filter out the digital spots on 50,276?
Thanks, Roger
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Unfortunately, lightning protection is one of the most discussed and least
understood topics in amateur radio. A properly engineered and constructed
Ufer ground works well but many seem to think that any amount of conductor
buried in any amount of concrete in any configuration is a Ufer ground!
There is a man I wish I had met. Look up his safecracking escapades
at Los Alamos!
73, Roger
On 4/16/2017 2:40 PM, kev...@coho.net wrote:
If you are not familiar with Richard Feynman he was a physicist who worked on
the Manhattan Project. He was also a professor at Caltech. Here are some of
I just tried and got this message:
We are expriencing issues with our Cloud Storage provider, Please be patient
while they work to resolve the problem. In the meantime some parts of QRZ may
not be available or may be slow to respond.
On 2/28/2017 3:00 PM, Ken G Kopp wrote:
Has anyone
Even the caption is incorrect! You don't "hone in" on anything.
73, Roger
On 2/17/2017 6:28 PM, Douglas Hudson wrote:
This is an example of how easy it is to build a kit.
http://www.eejournal.com/archives/fresh-bytes/everything-about-this-beautiful-woman-soldering-stock-photo-is-w/
I immediately delete such messages! It may be genuine but it sure looks like a
troll looking to see if it's a "live" email address.
73, Roger
On 1/25/2017 2:38 PM, Jim Rhodes wrote:
When I get an email like this when I reply to a message on a forum like
this I get the impression that someone
I use an amplified pair of computer speakers.
73, Roger
On 12/31/2016 5:46 PM, Harry Yingst via Elecraft wrote:
I have the K3 and a pair of SP3 speakers
When I turn down the RF gain and turn on the NR (to clean up the band noise) I
run out of Audio (too quiet) to hear the weaker signals.
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I have the CP48 USBHID keypad which is the correct one for P3 users.
It already has the software to show as non-multimedia keyboard as
described on the NK7Z website.
$100 shipped
73, Roger
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Jeff, VA2SS, wrote an article covering this:
http://www.eham.net/articles/32176
Unfortunately, I can't retrieve the picture that went with the article. Jeff
used a "serial port splitter" but I think a program like LP-Bridge that
generated virtual ports will work also. I ordered a USB keypad
I found a good buy on a Genovation CP48 -USBHID keypad but don't know
how to get it to work with LP-Bridge and my K3. I don't see a way to assign
it to a virtual port on LP Bridge. Any suggestions?
73, Roger
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Where does the K3 utility store it's data? RF gain cal, AGC cal, etc
73, Roger
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Well, the "edit as new" didn't seem to work!
The rig with no front panel LEDs working is a K3.
I do have 5 volt power to the LEDs.
73, Roger
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I just finished the connector mod and replaced some of the encoders. All seemed
to go well until I noticed that NONE of the front panel LEDs were lit!
has anyone been down this road before?
73, Roger
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I'm installing the "gold plated" connector mod and I noticed that my
PA module has a 2700 ufd cap mounted on the heat sink side of the
board between the +12 volt input and ground pins of P68B.
This cap isn't on the latest schematic (Jun 2010) and I don't see it
on any pics of the PA module! I
For an international sewer; see 20 meters!
On 2/14/2016 12:40 PM, Jim Brown wrote:
On Sun,2/14/2016 9:17 AM, John wrote:
"A third word of advice...until you have some HF miles under your belt,
stay away from the abject buffoonery known as 75 meters."
Is there a problem with one of our bands?
Now you're talking an extra Kilobuck for these goodies. A programmable keypad
is far less expensive.
73, Roger
On 12/24/2015 10:51 AM, Cady, Fred wrote:
Hi,
A P3 with the SVGA option can store 50, 124 character macros that can be
executed with a single Ctrl-, Alt-, or Alt-Ctrl-key. You do
Sorry! It's a K3
On 11/23/2015 7:45 AM, Roger D Johnson wrote:
I've had power output problems on 30 for a while but I just noticed something
strange. I set the power to 100 watts and that's what it measures on my LP-100.
When I turn on the sub-receiver, the power drops to 88 watts! My TXGAIN
I've had power output problems on 30 for a while but I just noticed something
strange. I set the power to 100 watts and that's what it measures on my LP-100.
When I turn on the sub-receiver, the power drops to 88 watts! My TXGAIN on
30m is 95 which is far greater than the other bands.
73, Roger
According to EZNEC, a 1/2 wave dipole up 1/2 wavelength has a gain of 7.76 dbi
at 27 degrees elevation. Most of this is due to ground reflection. My vertical
has a
gain of 0.72 dbi. So I can run 7db more power (500 watts)!!!
73 Roger
On 11/12/2015 7:30 AM, Roy Koeppe wrote:
“Kpa500 on 60 is
Whatever happened to the plan to provide adjustable or stepped values of
selectivity for the APF function? I rigged up a kluge consisting of an old
Autek QF-1A but would much rather have it's function built-in.
73 Roger
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On further thought, you can use a 12 volt system with boost/buck converter to
ensure
constant voltage to the K3.
On 9/25/2015 4:05 PM, Roger D Johnson wrote:
A possible solution is a 24 volt system. The solar panels are available as are
24 to 12
volt solid state converters.
73, Roger
A possible solution is a 24 volt system. The solar panels are available as are
24 to 12
volt solid state converters.
73, Roger
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On 9/14/2015 2:42 PM, Roger D Johnson wrote:
According to the schematic, there is a shunt diode on the PA board. Hopefully,
it
prevented the full 12 volts from appearing on the circuitry. The smoke probably
came from the chokes ahead of the diode.
73, Roger
On 9/13/2015 11:09 PM, Don
It's pretty easy to jumper around the pins.
73, Roger
On 9/6/2015 8:13 AM, Joe Subich, W4TV wrote:
What is you serial number?
Intermittent ERR 12V is one early warning sign of the "burned
12V pins" on the KPAIO3 and KPA3 boards. If you have an early
K3 that did not have the "gold pins" on
My new boards arrived today. I popped one into the K3 for some testing. I was
especially interested
in the low frequency performance as I like to DX the LF broadcasts from 153 to
279 kHz. What I found
was that below 400 kHz, the noise level rises and at 100 kHz it's almost 20 over
9 on the S
The 4 encoders to the left of the main tuning knob all have a notchy feel
to them whereas the RIT encoder feels smooth. Is this normal? Are the
newest encoders notchy or smooth? Is the displayed frequency supposed
to change when the RIT knob is turned even when RIT is off?
73, Roger
I think it's for Field Day or contests where someone else may be operating the
rig. It keeps
some of the more critical items a bit better hidden.
73, Roger
On 3/7/2015 5:36 PM, Ken G Kopp wrote:
I've wondered why there's an OFF mode for TECH MODE. Mine's never
been off since I first turned
There are two problems with the PowerPoles:
1. The contact pulls out of the housing due to improper assembly.
2. The completed plug assembly (contacts and housings) pulls out of the
matching assembly on back of the K3.
Most people having a problem don't specify which problem they're
It's normal, Dave. I've been trying to get Elecraft to change this for years.
That and the adjustable
bandwidth for the APF always seem to fall through the cracks. I finally bought a
Autek QF-1A
which helps immensely.
73, Roger
On 2/12/2015 12:38 AM, dyarnes wrote:
Hi All,
I probably
I think very few hams could afford the KWM-2. I'll give Collins the credit for
the innovation
but I think the Heath SB series had a much bigger influence on the average ham.
73, Roger (former owner of the SB-101)
On 2/7/2015 10:09 PM, Fred Jensen wrote:
I'm working on my 62nd year as a ham
I meant to say same filter on 30 and 20m.
On 1/20/2015 3:49 PM, Roger D Johnson wrote:
My K3 has always had low output on 30m (ca 90 watts). I checked the TXG
(transmit gain)
figures and 40m is 64, 30m is 103 and 20m is 30. The K3 uses the same lowpass
filter on
30 and 40m. Is it possible mine
My K3 has always had low output on 30m (ca 90 watts). I checked the TXG
(transmit gain)
figures and 40m is 64, 30m is 103 and 20m is 30. The K3 uses the same lowpass
filter on
30 and 40m. Is it possible mine rolls off too quickly at the low end?
73, Roger N1RJ
It IS possible to send the K3 off to never-never land by removing the 12 volt
input before
shutting the radio off with the power switch. I've had it happen whilst mucking
around
behind my desk and accidentally pulling out the Anderson power-pole connector.
If you've saved the settings using
I went to call VY2ZM on 75m SSB thia AM and nothing! I've gone thru all the
checking proceedures
I can think of including reloading software. I'm stumped. Any suggestions?
73, Roger
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Only if you have the attenuator terminated properly!
On 6/6/2014 2:57 PM, Harlan wrote:
It must be my old age setting in but I can't get my head on right.
I have an AT1 attenuator I just finished assembling. My understanding of dB
attenuation must be off.
If I use an input of 1 volt,
I have only one small complaint about the ergonomics. I think the POWER button
should
be on the top left of the panel. My last two radios had it there and I was used
to it. I've
learned to use it at it's present location so it's a very minor gripe.
73 Roger
Careful, Bill. You're about to be flamed by the Power Pole Police! You know,
those
that insist that insist that it takes 2700 lbs of force to disconnect PPs or
that you, in
your stupidity, have assembled the connectors improperly!
I've had them come apart several times when futzing around the
I do not dislike Power Poles and use them for many cords around my station. The
problem is that
my K3 is fed from the power supply using large (stiff) diameter conductors.
Brushing up against
these can cause them to disconnect from the K3. If the K3 is powered up, this
can result in the K3
cable to my K3 with a
four inch or so piece of the supplied cable with the PP's in line
crimped to it using vehicle cabling crimps. Provides flexibility at the
K3 without adding any significant extra IR loss.
Regards,
Mike VP8NO
On 13/03/2014 11:21, Roger D Johnson wrote:
I do not dislike Power
Page 63 of the manual. if you have anything on the ACC connector it must be
removed for this to work.
On 3/13/2014 11:15 AM, bwru...@gmail.com wrote:
Can you tell me where to find the procedure just in case?
73 De Brian W3BW
Brian F. Wruble, C.F.A.
Leap and the net will appear.
On Mar 13,
Ok...Let me ask YOU. Do you own a K3 and have you done this?
73, Roger
On 3/13/2014 2:22 PM, Art Bross wrote:
Careful, Bill. You're about to be flamed by the Power Pole Police! You
know, those
that insist that insist that it takes 2700 lbs of force to disconnect PPs
or that you, in
your
Or at least kill your idiotic comments!
On 3/13/2014 2:53 PM, GRANT YOUNGMAN wrote:
I kind of hope that Eric comes in and kills this thread.
I have NEVER had the power poles “fall out” of the back of my K3. That said, I
don’t pick up my radio and try to throw it across the room, I don’t have
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