Re: [Elecraft] K3 Powers Off On Its Own

[David Hachadorian]

On one of my K3's the Powerpole receptacle got flaky. Turn the radio on, 
and then wiggle the plug  to see if it drops out.  I resoldered where 
the receptacle pins mate with the circuit board inside, but I still had 
to use a tie-wrap to hold the plug in a certain position.  I'll fix it 
the right way one of these years.


Good luck!

Dave Hachadorian, K6LL
Yuma, AZ

On 9/15/2023 3:50 PM, Jed Petrovich wrote:

Hello all:

Earlier this week my K3 shut itself off while it was in receive mode. It
had been running for about 20 total minutes at the time it turned off. I
had just finished a 15 minute QSO. The Tx power was 10 watts.

When I tried to turn it on again, the display briefly flashed for a few
seconds and I could hear a slight buzzing sound from within the chassis and
it went off. I waited for a short time and tried again. The K3 display
flashed for a few seconds along with the buzzing, but would not stay
powered. I tried this one more time, but the display flashed very briefly,
buzzed and then off again.

This morning I could power on the K3, but I didn't let it run very long
before I powered it off. It would seem this is some sort of heat-related
issue.

It's serial number 2826, but it's had several mods over the years including
the upgrade on the receiver.

Any ideas would be appreciated.

73,

Jed
AD7KG
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Re: [Elecraft] CM-500 Question

[David Hachadorian]

I just bought another SB-45 last week on Amazon.  Mic Sensitivity is 
fine, same as it used to be.


Dave Hachadorian, K6LL
Big Bear Lake, CA

On 8/8/2023 7:07 AM, David Herring wrote:

Comfort. My ears tend to be on the large side.  Most “over the ear” headphones 
are really “on ear” headphones for me.  After an hour or two of that, my ears 
really begin to hurt. The CM500s have large enough cups to encompass my entire 
ear (albeit barely), thus permitting me to wear them for extended periods of 
time.

In reality, that was my only basis for selecting them over others.  The fact 
that, until my latest pairs, they worked great was of course important but I 
know there are plenty of other options out there that work at least as well.  
But what good are they if I can’t wear them?

Having received two consecutive pairs of real lemons, I’ll be looking for something other 
than the CM500s in the not too distant future.  So if anyone knows of alternates that 
will fit ol’ big ears here, I’m, well, "all ears" as they say. ;-)

I know the Koss offerings are essentially the same thing, but if the CM500s 
stink in the mic sensitivity department, would the Koss suffer the same fate?  
Anyone know?

Might I be better off going for a dynamic mic rather than an electret?

73,
Dave - N5DCH

PS so as to keep this even remotely related to Elecraft, I love my K4, my KX3 
and my K2 and would be using said headphones for all three at some point or 
another.  ;-)



On Aug 8, 2023, at 7:43 AM, Joe Subich, W4TV  wrote:



On 8/8/2023 12:16 AM, Jack Brindle via Elecraft wrote:

As contesters who wear headphones as much as 48 hours straight on weekends, we 
find comfort to be one of the most important assets of any headphone.

Here is the key!  K8JHR calls the CM500 earpads "flat and lack luster"
but they are larger than the majority of "on the ear" computer and
gaming headsets.  For many of us, the important attribute of a headset
is earphones completely surround the ear without placing excess pressure
on the side of the head, particularly on the temple pieces of glasses
while simultaneously providing modest isolation from room noises and
are not "heavy" on the top of the head and neck.

I know there are $300-$500 broadcast headsets (Beyer, Audio Technica,
Senheiser, etc.) but I for one certainly am not going to try multiple
professional headsets until I find one that is comfortable for even
six hours at a time.

73,

   ... Joe, W4TV


On 8/8/2023 12:16 AM, Jack Brindle via Elecraft wrote:

As contesters who wear headphones as much as 48 hours straight on weekends, we 
find comfort to be one of the most important assets of any headphone.
There are LOTS of headphones that sound great, have outstanding performance 
both in their speakers and microphone. But, they make you feel like your
head is in a vice after just a few hours of wear. If the headphone is 
uncomfortable, then no matter what its other characteristics are, they will be 
thrown in the trash.
The CM-500 happens to be one of the most comfortable headset for long-term wear 
(many of us feel that way). Many others (some mentioned in this discussion)
don’t come close. I also have a pair of the KOSS version of this headset. It is 
back in its box - wearing it is very uncomfortable for me. Like others, I have 
tried many
different headphones put out by many companies. This past weekend, for NAQP CW, 
the CM-500s were on my head for 10 hours. With the CM-500s out of production,
I’m not sure what I will turn to when these wear out. I do know that none of 
the computer gaming headsets I have tried fit the bill. And I had the privilege 
of trying out
many of the headsets from a major gaming device company I worked for as a 
design engineer.
Now, before you put down others, find out what their requirements really are.  
It might not be the same thing as yours.
73,
Jack, W6FB

On Aug 7, 2023, at 9:44 PM, JHR  wrote:

Ahem.   CM-500 headset.   Meh.   Uninspiring old school.

I was a long time microphone and headset product test and review writer for the speech 
recognition trade - including both vendors and manufacturers, such as IBM, Microsoft, Nuance, 
Scansoft, Lernhout & Hauspie, Dragon Systems, Kurzeweil AI, and many hardware resellers.  
 I suppose that made me an "influencer" long before that became a popular pastime 
for teenagers broadcasting from their bedrooms on YouTube.

I tested A LOT of microphones and headsets of all kinds, including the CM-500 
which appears to be a rebranded $29 KOSS SB-40  with an very low cost electret 
capsule instead of the original more costly dynamic cartridge.  I have repaired 
multiple CM-500s which broke down during service at a multi-multi contest 
station and at friends' home stations.  The microphone is nothing more than a 
thirty cent condenser capsule - exactly what umpty-thousand other headsets 
have.  The stock ear pads are flat and lack luster.  The earphone receivers 
(speakers) are mediocre at best.  The product has been in p

Re: [Elecraft] A Good Headset For A K3

[David Hachadorian]

I like the Koss SB-45 (3.5mm plug version, not USB).  It sounds great, 
has a nice padded headband, and is $30 on Amazon.


Dave Hachadorian, K6LL
Big Bear Lake, CA



On 8/6/2023 12:16 PM, Jim Brown wrote:

On 8/6/2023 11:43 AM, Eric Garner wrote:

2nding the radiosport headsets. They are not cheap, but they are
comfortable for extended wear, sound great, and block nearly all 
background

noise.


Comfort depends strongly on the head of the wearer. I tried on a set 
twice, first at a club meeting, then a few years later after 
seeing/hearing posts like this. On both occasions I found them to be 
an instrument of torture.


By contrast, the Yamaha CM500 headset is VERY comfortable -- I've worn 
mine for long contest weekends with no fatigue, and both phones and 
mic sound great. With the right TXEQ, audio is super competitive, is 
easy to listen to and cuts through noise and QRM. The headset plugs 
straight into the rear panel of both a K3 and a K4, (turn on bias, 
because mic is an electret). Most of us program PF2 to toggle the 
speaker on and off (go to the menu for that function and push PF2). 
With the right cable adapter, it also works great with a KX3.


The only shortcoming of the Yamaha headset is it's somewhat light 
construction -- I'm super clumsy, am always knocking the headset on 
the floor, which has broken the cable. But at $60 or so compared 4-6 
times that cost for ham specialty headsets that are no better, it's 
cheap.


73, Jim K9YC

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Re: [Elecraft] WTB/trade for K3(S) CW filters

[David Hachadorian]

Maybe you can work a deal with K6RO, who has a sideline business dealing 
in used Elecraft radios and accessories.


Dave Hachadorian, K6LL
Big Bear Lake, CA

On 8/1/2023 10:09 PM, AB2E Darrell wrote:

Hi all,
Just picked up a K3 w/upgraded S synths, but the op was mostly SSB.
I want to pick up some CW filters, preferably matched pairs for main & sub.
500/400/200.
Here is the current lineup.

Main receiver roofing filters 13 kHz, 6 kHz, 2.70 kHz matched pair, 1.8 kHz, 
1.50 kHz
Subreceiver roofing filter ,,2.70 kHz matched pair
This K3 has the 2m xvtr, so the 13Khz filter was needed for FM. I will likely 
remove the 13Khz, and the 6Khz, along with the 2m xvtr.
If any of you are SSB ops and happened to have acquired a K3 or K3S with all CW 
filters, I would be glad to swap.

Email me offlist with what you have, or what you want to trade.

Also looking for a pair of P3 side panels to replace the scratched ones on the 
P3 that came w/ the package.
73 Darrell AB2E

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Re: [Elecraft] WTB K3-K3S 200hz Or 250hz Filter.

[David Hachadorian]

Try K6RO.  He deals in used Elecraft radios and has many filters available.

Dave Hachadorian, K6LL
Yuma, AZ

On 4/23/2023 4:05 AM, Ramon Batista wrote:

Looking For 200hz Or 250hz Filter For K3-K3S.

Ray WD4X
239-227-9414
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Re: [Elecraft] K3, using AM Mode RX with 250 Hz filter

[David Hachadorian]

Hi Keith,

Thanks for the reply.  I tried a bunch of different width/mode 
assignments just now, but got a strange rumbling noise with those 
configurations.  Thanks for suggesting taking a picture of the original 
config, because my experimental settings got pretty wild!


73

Dave Hachadorian, K6LL
Yuma, AZ

On 4/14/2023 1:06 PM, Keith Trinity WE6R wrote:
Try using the K3 Utility to re-label the .250 to a different value, 
like 6K, make sure it has a checkmark for AM.
Or try disabling the other slots by maybe just unchecking any that 
have AM checkboxes.
Experiment with that, you should be able to have it stay on the .250 
and still be able to use WIDTH.

(Take a picture of your original setup first for restoration)
Keith WE6R Elecraft K3/K4 Tech

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[Elecraft] K3, using AM Mode RX with 250 Hz filter

[David Hachadorian]

For an upcoming Frequency Measurement Test, I'm trying to use a K3  in 
AM Mode RX-only with a 250 Hz CW Filter. My plan for the FMT is to use a 
GPS Disciplined Oscillator as a BFO, and by measuring the frequency of 
the beat tone, I will be able to accurately determine the mystery 
transmit frequency, without worrying about the dial calibration or drift 
of the K3 itself.


It works fairly well with the standard 2.7 KHz filter, but, the WIDTH 
control only reduces the DSP bandwidth down to 1.35 KHz. 1.35 KHz is 
pretty wide if there is QRM near the mystery signal. I tried using the 
XFIL button to manually switch in the 250 Hz filter, but signals don't 
seem to pass through when I do that, and then when I touch SHIFT or 
WIDTH, the roofing filter switches back to 2.7 KHz.


Is there a way to accomplish what I'm trying to do?  My alternative is 
to set up a narrow digital filter in the tone recording software, but it 
is still disconcerting to hear a bunch of QRM around the mystery signal 
in real time.


Thanks in advance.

Dave Hachadorian, K6LL
Yuma, AZ
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Re: [Elecraft] K-3 Saga Continued

[David Hachadorian]

Maybe something here will help:
https://marc.info/?l=elecraft&m=145323127930319&w=2

Dave Hachadorian, K6LL
Yuma, AZ

On 3/14/2023 7:34 PM, Pete Smith N4ZR wrote:
So, after many hours of fiddling around, I had to give up on the KIO3B 
for the time being.  I made repeated efforts, being exquisitely 
careful to make sure all the board-edge connectors were properly 
meshed, and every time I came up with ERRIO3.  So at that point I 
pulled the KIO3B parts, replaced them with the original KIO3A parts, 
and the radio started up without any errors. I think I may have gotten 
a dead-on-arrival KIO3BUPKT, and have written to Elecraft. Transmit 
side seems to be fine - tested on a number of bands - as does the 
interface with my KPA1500.


One remaining crazy problem - the receivers, both the main and the 
sub-RX, are VERY dead.  Band noise doesn't move the S-meter on any 
band, and *almost* nothing can be heard.  It sounds to me as if what 
I'm hearing on either RX is probably the result of incidental 
coupling, and that it's likely that some shared RX signal connections 
is open.  Can anyone who is intimately familiar with the K-3 suggest 
which ones I might scrutinize?  I have the schematics but have not 
been able to relate them to the physical reality.


Thanks in advance


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Re: [Elecraft] Looking for two 250 hz filters for K3

[David Hachadorian]

Try K6RO.

Dave Hachadorian, K6LL
Yuma, AZ

On 3/14/2023 7:26 AM, Erik Wheeler wrote:

Hi all,

I'm looking for two 250 hz filters for my K3.

If anyone has some for sale, or can point me in the right direction to find
some, I'd appreciate it.

73,
Erik
N1CFO
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Re: [Elecraft] No stations being heard on K3

[David Hachadorian]

Maybe something here will be helpful: 
https://marc.info/?l=elecraft&m=145323127930319&w=2


Dave Hachadorian, K6LL
Yuma, AZ

On 2/6/2023 9:19 AM, Gary K9GS wrote:

I checked several things this morning. 1. RX antenna is NOT selected.2.  RF 
gain is not turned down.3.  I swapped to antenna 2 port on the radio and 
switched to antenna 2. Same behavior as before.4.  I connected my antenna 
analyzer to the coax coming out of the back of the radio. All readings look 
normal.I inspected all of the connectors.  All look good.  The coax is RG8X 
from DX Engineering with crimped and soldered DX Engineering connectors.   No 
physical damage to the cable that I could see.  I inspected the whole length.5. 
 I answered a FT8 CQ. Received an immediate reply with +11 report. Several RBN 
spots of my signal.6.  I am hearing some signals on 14074 but they are weak and 
not showing much of a signal on the P3.7.  When I switch to the unused antenna 
2 port I hear nothing...just like I should.8.  The receiver sounds exactly like 
and performs like the attenuator is turned on;  it is NOT, however. 9.  
Listened on other bands which should be filled with signals this time of 
daysame as on 20m.I'm stumped and suspect something opened up.  I don't 
recall making any configuration changes to the radio.  Maybe something loose 
inside like a TMP connection??Any ideas what additional to check?73,Gary K9GS
 Original message From: Jim Brown  Date: 2/6/23  3:41 AM  (GMT-05:00) To:elecraft@mailman.qth.net  Subject: Re: [Elecraft] No stations being heard on K3 On 2/5/2023 10:19 PM, Gary K9GS wrote:> I have a K3, not K3S.  A couple days ago I noticed a lack of signals heard.  I'm hearing static/ band noise just no signals.  I've listened on several bands.. same regardless of band.I went up in the digital portion of the band where there are always signals...I was able to decode a few but the band should have been filled with signals.Hi Gary,Thinking of things that have happened to me where there's nothing wrong with the radio -- is it possible that you accidentally hit the button for the RX antenna? RF gain turned down? Something in the antenna system?Old hands on email reflectors say that the antenna system is the first thing to check, and that includes every cable, every connection. Are there any no-name connectors or adapters anywhere in your system? When I got back on the air in 2003 I bought a lot of no-name adapters that turned out to be junk, and that caused me no end of failures that were hard to trace. REAL connectors and adapters say Amphenol on them (and aren't cheap), or have a MIL spec part number stamped into them (they're what I look for at hamfest flea markets, where they ARE cheap, because they aren't new and shiny).How about the antenna(s) themselves? Do you have (or can you borrow) an antenna analyzer? Try disconnecting the coax connector from the radio connecting it to the analyzer, and making measurements. If you're borrowing the analzyer, you probably also want the guy who loaned to you to make the measurements -- the user interface most analyzers nowadays can be varying degrees of user-unfriendly if you haven't studied the user manual.What happens if you transmit? What's the indicated SWR?  Do you have a watt-meter in line? I'd try with something like 5 W or 20W -- with 20W, it's very low power from the 100W stage.73, Jim K9YC__Elecraft mailing listHome:http://mailman.qth.net/mailman/listinfo/elecraftHelp:http://mailman.qth.net/mmfaq.htmPost:mailto:elecr...@mailman.qth.netThis  list hosted by:http://www.qsl.netPlease  help support this email list:http://www.qsl.net/donate.htmlMessage  delivered tok...@gjschwartz.com  
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Re: [Elecraft] semi qsk (vox) with the K4 need advice

[David Hachadorian]

My AL-1500 has pretty slow relays.  I would guess that the AL82 is 
similar.  In my K3, I have config/TX DLY set to 14 ms.


Dave Hachadorian, K6LL
Yuma, AZ

On 1/20/2023 1:33 PM, Gerry via Elecraft wrote:

I usually use a foot switch with my K4 and AL82.

I was wondering what would be the best settings for semi qsk  (vox)  with the
K4 and AL82 to avoid hot switching.  I want to be conservative.

What I've read so far online has been of little help.

Tks

73

Gerry
K1NY
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[Elecraft] Elecraft excellent service

[David Hachadorian]

One of my K3's failed during the RTTY Roundup - no RX, no TX.  I sent an 
email to Elecraft support, and Doug replied the next day, starting a 
series of e-mail exchanges.  Doug concluded that the Synthesizer Board 
was likely the source of the problem.  I had an old KSYN3 Synthesizer 
Board lying around, and used it to replace the KSYN3A in the radio.  The 
problem was solved.   Doug says turnaround time to repair the KSYN3A 
shouldn't be too bad.


To me, this company demonstrates the knowledge, ability, and motivation 
required to get stuff done effectively.


Dave Hachadorian, K6LL
Yuma, AZ


.
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Re: [Elecraft] [K3] Odd transmit power output behavior on TX DATA

[David Hachadorian]

It could be a momentary high SWR when starting a transmission because of 
some slow switching somewhere in line. In K3 Config, try increasing the 
value of Tx Dly.  I have to set mine at 14 because of a slow amp.


Dave Hachadorian, K6LL
Yuma, AZ


On 12/30/2022 8:34 AM, Bill Coleman via Elecraft wrote:

I own two K3/100 radios. One is SN70xx, another SN87xx. On one of them, I 
observe an odd behavior with transmit power output.

Even though I have an antenna matched to nearly 1:1 VSWR using the internal 
tuner, any time I change bands, or adjust the power level, SN70XX does not put 
out full power right away. Instead, it starts about 40-50 watts, and then 
slowly creeps up to 100 watts. This takes about 4-6 15 second FT8 transmissions.

It doesn’t appear to behave this way on CW or SSB. Only on TX DATA modes.

My other radio doesn’t exhibit this behavior.

The two radios have different internal options, but many of the configuration 
parameters are the same.

Any suggestions?

Bill Coleman, AA4LR, PP-ASELMail:aa...@mac.com
Quote: "We invented personal computing."
   -- Bill Gates @ TechNet / MSDN 2003


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Re: [Elecraft] K3 RX does not always work at power up

[David Hachadorian]

Does your K3 have gold pins on the front panel connector?  The old 
tinned pins were apt to cause a lot of weird/intermittent problems.


Glad you were able to fix the D25 issue.

Dave Hachadorian, K6LL
Yuma, AZ

On 11/2/2022 9:54 AM, George Fremin III wrote:


The K3 that went deaf and I replaced D25 in - has had another issue
that I have not understood - and it is only annoying when it happens.

Sometimes I will turn it on and it all seems fine but it hears zero
signals - it is not that it is deaf it is more like it is not
working. It does have receiver hiss that makes you think it is fine
and it seems to transmit (although I have not tried to listen to it to
confirm) but it just does not work at a receiver.

I should try the TX next time.

Power cycling the radio once or twice usually makes it work right away
and it is fine.  It does not fail like this at every power on.

This radio is being used as a remote radio - and I leave it on almost
all the time - that is one reason this is not been more of an issue
and often I forget it does this - until I power it on.  Like last
night after replacing D25 - and the radio seemed deaf - but even more
deaf than before as it coudl not even fainly here the signal
generator.  Then I remembered the power on issue and I turned it off
and back on and it came to life.

It is an older K3 that has been mostly upgraded to a K3S.
Single receiver.
2m module.
Newer pre amp.
USB interface.
RX ant ports.

Anyone recall seeing this symptom before?

Thanks


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Re: [Elecraft] K3 that has gone deaf

[David Hachadorian]

Hi George,

Maybe the second paragraph from Elecraft here will help:
https://marc.info/?l=elecraft&m=145323127930319&w=2

73

Dave Hachadorian, K6LL
Yuma, AZ

On 10/12/2022 9:54 AM, George Fremin III wrote:

I have a K3 that has gone deaf.  It can bearly hear my XG1 at 50 uV
plugged into either the RX or ANT-1 ports.

It does not have an antenna tuner.

I have removed KXV3 option and put jummpers in W1 and W2.

It remains deaf.

>From doing some reading I see that D25 could be the issue. 


Is there a way for me to prove that or do I just need to replace D25
to find out?

I do notice that if I touch some areas on the bottom board the signal
does increase.

Thanks


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Re: [Elecraft] warranty

[David Hachadorian]

If you have to pay for shipping, and want to save some money, I 
recommend Pirate Ship. https://www.pirateship.com/rates


Dave Hachadorian, K6LL
Big Bear Lake, CA

On 8/1/2022 12:50 PM, rpu...@live.com wrote:

  I have a two month old KPA 500 that needs warranty service and I was 
wondering if anyone else has been expected to pay shipping to get their 
equipment repaired under warranty? I am a 78 year old on SS and don't believe I 
should have to pay to have a defective unit for repair. I would appreciate any 
comments. Rich KB9RP
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Re: [Elecraft] DX Clusters reccomendation

[David Hachadorian]

The real value in using DX Clusters is the ability to apply detailed 
filtering, such as

Band
Band Segment
Mode
State and country of spotted stations
State and country of spotters

For CW and Digital modes, it is essential that the cluster provides 
spots from the Reverse Beacon Network, a worldwide network of automatic 
decoding machines for those modes.


From a quick perusal of the LOG4OM manual, it looks like the only 
filtering is for Band and Mode.


Below is my method for connecting to Telnet Nodes. I recently posted it 
on the N1MM Logger Reflector.  If you don't want to use this method, at 
least you can use the included list of recommended CC-Cluster nodes.


--

There are many ways to hook up to Telnet.  I recommend the following 
method.  It has worked great for me for years.


1. Go to http://www.bcdxc.org/ve7cc/ and download the CC-User program.  
The download link is about 2/3 of the way down the page.


2. Open CC-User, and get it set up.  I can help you with this if you 
need help.


3. For maximum compatibility with CC-User, connect to a Telnet Node that 
runs CC-Cluster software, and also carries spots from the Reverse Beacon 
Network (RBN).  I recommend the following:

ve7cc-1,  ve7cc.net, port 23
ae5e-2, dxspots.com, port 23
n4zkf-1, dxc.n4zkf.com, port 7373
w0mu-1, w0mu.net, port 7373
w8wts-3, dxc.w8wts.net, port 7373

4. Before each contest, set up the filter parameters on the Telnet Node 
by using the slick graphical CC-User interface.  No knowledge of arcane 
filter commands is needed.  After the Node is all set up, you can 
minimize CC-User so it doesn't take up screen space.  CC-User Feeds the 
filtered spots to N1MM logger via an internal telnet connection on a 
node called localport, 127.0.0.1, port 7300.  You may have to edit that 
node into the N1MM Node List.


5. Another advantage of connecting to a CC-Cluster is the built-in error 
filtering of those nodes.  It is very rare to see a busted call from a 
CC-Cluster Node.


Dave Hachadorian, K6LL
Yuma, AZ
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Re: [Elecraft] K3 Frequency Calibration

[David Hachadorian]

That Keuwlsoft Audio Frequency Counter is pretty cool!  Thanks for 
pointing it out.


I found the easiest way to use it is to put the K3 in reverse CW, tune 
to 10.00 MHz, and set REF CAL to a setting that "eyeball averages" 
best to your PITCH setting.  Even with the eyeball averaging, it is 
pretty obvious which REF CAL setting is best. Use reverse CW, because if 
you rotate REF CAL to the right, the pitch will increase, so it is more 
intuitive than normal CW.


I will use this as my go-to cal procedure.

Dave Hachadorian, K6LL
Yuma, AZ


On 12/19/2021 5:18 AM, Nate Bargmann wrote:

* On 2021 18 Dec 23:09 -0600, David Hachadorian wrote:

After exchanging emails with N4ZR, who started this thread, we think this is
the easiest procedure:

Tune the rig to 10.000 MHz in CW mode.  Listen to the tone of the WWV
carrier, which should be close to your CW PITCH setting.
Switch back and forth between reverse cw and normal cw, adjusting REF CAL
until the tones are equal in pitch on normal and reverse.

This procedure should get you calibrated well within 1 Hz, much better than
required for any amateur radio application that I can think of.

In addition, I installed the "Keuwlsoft Audio Frequency Counter" app on
my Android phone and set it next to the speaker.  Its display in Hertz
makes dialing in the reference calibration value quick and easy.  On my
K3 it shows about .5 Hz difference between Norm and Rev.  I certainly
cannot hear that!

73, Nate, N0NB


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Re: [Elecraft] K3 Frequency Calibration

[David Hachadorian]

After exchanging emails with N4ZR, who started this thread, we think 
this is the easiest procedure:


Tune the rig to 10.000 MHz in CW mode.  Listen to the tone of the WWV 
carrier, which should be close to your CW PITCH setting.
Switch back and forth between reverse cw and normal cw, adjusting REF 
CAL until the tones are equal in pitch on normal and reverse.


This procedure should get you calibrated well within 1 Hz, much better 
than required for any amateur radio application that I can think of.


Dave Hachadorian, K6LL
Yuma, AZ


On 12/18/2021 2:39 PM, Bob McGraw wrote:
The method I use seems to work great and be easy enough to do. No zero 
beating required and no external measurements required.


Put the radio in CW mode, tune to a WWV frequency and press and 
release SPOT.  The radio will automatically zero to the carrier with a 
tone that matches your preferred CW note.  Then via the CONFIG MENU go 
to REF CAL and adjust up or down with the VFO A knob,  the number of 
Hz error the previous SPOT routine disclosed.   A 10 Hz change on the 
REF CAL will equate to about 2 Hz at 10 MHz.    I find that checking 
several different WWV frequencies is even better using this method.   
To make sure it is optimum, tune to 5 or 10 Hz above and below each of 
the WWV frequencies.  Press SPOT from both above and below and see how 
it resolves.   Usually I can get within 2 Hz or better on all of 
them.  You may need to do this several times.  Be sure the radio has 
been on for at least 1/2 hour to allow things to stabilize.


73

Bob, K4TAX



Message: 4
Date: Thu, 16 Dec 2021 18:46:59 -0500
From: Don Wilhelm
To: Pete Smith N4ZR, Elecraft List

Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<81d4d693-6cd1-f11b-30b7-d4523ce74...@w3fpr.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

Pete,

When using WWV to set the K3 reference, make certain you are listening
to the carrier.? WWV is an AM signal that is modulated by a 500 or 600
Hz tone on alternate minutes (440 Hz 2 minutes after the hour).? That
produces tones that are both above and below the carrier.
So be certain you are hearing the carrier and not one of the modulating
tones.

73,
Don W3FPR

On 12/16/2021 4:34 PM, Pete Smith N4ZR wrote:

I've been wondering for some time if my 10-year-old K3's frequency
calibration was off, because it seemed like most spots of me were well
off when I clicked on them, usually in one direction.? Not having a
frequency counter, I went to the alternative method outlined in page
49 of the manual.? I thought I did it all "by the book", but found
that when I was done 15-MHz WWV's carrier frequency (determined by
zero-beating the carrier) was almost 400 Hz low. Since I wasn't
looking for FMT-level accuracy, I went back to WWV and adjusted the
REF CAL setting by ear until 15.000 on my RX dial was as close to
zero-beat with WWV as I could tell. We'll see how it worked out, but I
wonder if I simply have some fundamental misunderstanding of what's
involved.? Wouldn't be the first time...



--

Message: 5
Date: Thu, 16 Dec 2021 17:01:50 -0700
From: David Hachadorian
To: Pete Smith N4ZR, Reflector Elecraft

Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<6453871f-7e7d-fa93-8a79-7b1efd5e4...@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

You had it fixed, but then you broke it again. After doing the
alternative method on page 49, when you tune in to 10. MHz in CW
mode, you should hear a CW note at the same frequency as your PITCH
selection.? I presume that is 400 Hz.

I got an extremely good score on last year's Frequency Measuring Test
using only that alternative calibration method.

73

Dave Hachadorian, K6LL
Yuma, AZ



--

Message: 6
Date: Thu, 16 Dec 2021 23:04:36 -0800
From: Ray
To: Wes, "elecraft@mailman.qth.net"

Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<61bc3686.1c69fb81.f8fd0.8...@mx.google.com>
Content-Type: text/plain; charset="utf-8"

Gents
Go to a WWV signal, (5.00)  on a Good Strong Frequency.
Place the Mode To Upper SSB, Listen to the Beat note Tone Freq,
Now Move the Mode to Lower SSB. Adjust the  Ref. Cal. Osc. until the 
Beat Note is the Exact Same Freq

On Lower SSB and Upper SSB.   Done
Ray WA6VAB  K3





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This li

Re: [Elecraft] K3 Frequency Calibration

[David Hachadorian]

You had it fixed, but then you broke it again. After doing the 
alternative method on page 49, when you tune in to 10. MHz in CW 
mode, you should hear a CW note at the same frequency as your PITCH 
selection.  I presume that is 400 Hz.


I got an extremely good score on last year's Frequency Measuring Test 
using only that alternative calibration method.


73

Dave Hachadorian, K6LL
Yuma, AZ

On 12/16/2021 2:34 PM, Pete Smith N4ZR wrote:
I've been wondering for some time if my 10-year-old K3's frequency 
calibration was off, because it seemed like most spots of me were well 
off when I clicked on them, usually in one direction.  Not having a 
frequency counter, I went to the alternative method outlined in page 
49 of the manual.  I thought I did it all "by the book", but found 
that when I was done 15-MHz WWV's carrier frequency (determined by 
zero-beating the carrier) was almost 400 Hz low. Since I wasn't 
looking for FMT-level accuracy, I went back to WWV and adjusted the 
REF CAL setting by ear until 15.000 on my RX dial was as close to 
zero-beat with WWV as I could tell. We'll see how it worked out, but I 
wonder if I simply have some fundamental misunderstanding of what's 
involved.  Wouldn't be the first time...



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Re: [Elecraft] K3 Noise Reduction

[David Hachadorian]

For 12 years I've tried to get any enhancement of s/n from the K3 IF/RF 
NB and NR.  I haven't seen one case where there is any improvement under 
contest conditions.  When the s/n just starts to improve, the desired 
signal is modulated and degraded by nearby signals to the point where 
reception is better with NB/NR turned off.  As far as I can see, both of 
these features are useless on the K3 under contest conditions.


Dave Hachadorian, K6LL
Yuma, AZ


On 12/15/2021 7:36 AM, Pete Smith N4ZR wrote:
Last weekend during the 10 meter contest I was experiencing very loud 
line-noise-like interference when my antenna was pointing south. I 
tried both my K3's Noise Reduction and Noise Blanker functions, and 
was unable to find any setting that gave useful relief.  With the 
noise blanker, in particular, I noticed that when it was on, not only 
was the buzz still very strong, but it seemed as if all CW signals on 
the band were being hum-modulated.  As soon as I turned off the noise 
blanker, the CW signals cleaned up.  Is there something wrong with my 
radio, or an adjustment issue, or is this interference simply too 
strong?  Obviously, I'll be trying to track it down, but it's not 
there all the time, so that could be tough.



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Re: [Elecraft] KPA-1500 tuner power ramp up

[David Hachadorian]

I don't know anything about the KPA-1500, but I have seen similar power 
ramping if I have K3/config/TX DLY set too short for my AL-1500 amps.  
With that amp, I have to set TX DLY to 14 msec.  What happens is that 
the K3 sees a momentary high swr before the amp relay closes, and 
throttles back power.  Sometimes you can even see "high swr" flash on 
the K3 display.  The power then slowly ramps up as the K3 recovers.


Dave Hachadorian, K6LL
Yuma, AZ

On 12/11/2021 5:49 AM, k4mwb wrote:

When using the tuner only (amp on standby), ATU tune works fine, but
observing the PWR it ramps up slowly from 0 watts. For example K3 set
to 100 watts, amp on standby, press ATU tune and it takes about 15
seconds for the amp PWR indicator to reach 100 watts. Is this normal?
There is no noise from the tuner during this time.
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Re: [Elecraft] Rx-In/Out used for exteranl SDR Device?

[David Hachadorian]

Are you hooking up the splitter correctly?  RX ANT OUT from the radio 
goes to the common terminal of the splitter, and one of the two 
independent splitter outputs goes to RX ANT IN on the radio.  The other 
independent splitter output goes to the SDR.  Sorry to bring up such a 
simple possibility, but sometimes it's the simple stuff that trips us up.


Dave Hachadorian, K6LL
Yuma, AZ


On 12/5/2021 12:52 PM, Pete Smith N4ZR wrote:
I don't know why I didn't think of that.  Just tried it, and there is 
no difference in S-meter reading , so it may/must be a splitter 
problem.  I tried it with another spltter, with and and without the 
SDR, and, again, large drop. WTF???


73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at.
For spots, please use your favorite
"retail" DX cluster.

On 12/5/2021 12:35 PM, Dave wrote:

I see about a 3 S-unit drop in signal
level when routing through the splitter

Pete (N4ZR), what do you see with a straight cable linking in/out?

I have no idea about Minicircuits splitters, but my home made one had a
measured 3.1 dB loss at 29.7 MHz.

73 Dave G4AON

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Re: [Elecraft] K3 issue

[David Hachadorian]

Does it have gold pins on the front panel connectors?  If not, all kinds 
of strange problems can arise.


Dave Hachadorian, K6LL
Yuma, AZ

On 11/19/2021 5:52 PM, Dick Frey wrote:

My k3 keeps losing its mind. One day it won't transmit SSB - I can whistle
up 100W but speech gives 5W of avg and ~15W peak.
On another day it says "KAT500 not turned ON". I have a KPA500 but no
KAT500.
My fix for both these has been to do a factory reset and reload my last
saved configuration -- not something you want to do in the middle of a
contest.
Any ideas on what might be causing its lapse into insanity?

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Re: [Elecraft] Elecraft W2: Calibration question

[David Hachadorian]

Actually, it's not the W2 Utility.  It's the Elecraft W2 Interface 
Program. http://w4smt.com/sight.net/W2/W2_WIN.zip


Dave Hachadorian, K6LL
Yuma, AZ

On 10/23/2021 12:37 PM, Dave wrote:
Thank you for your suggestion!!  I must be looking at the wrong 
software, I have the W2 utility, and it has nothing like that in it.  
In fact it looks like all it does is update firmware, and test 
macros... I see no settings of any kind for the W2...


73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 10/23/21 9:36 AM, David Hachadorian wrote:
I don't own one of these, but I think calibration is done with the W2 
Utility, using the special USB cable that comes with the W2.


Dave Hachadorian, K6LL
Yuma, AZ

On 10/23/2021 8:53 AM, Dave wrote:

Hello,
Looking over the manual for the W2 I see no way to calibrate it. Did 
I miss something, or is there a way to perform a calibration on the 
wattmeter?



.

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Re: [Elecraft] Elecraft W2: Calibration question

[David Hachadorian]

I don't own one of these, but I think calibration is done with the W2 
Utility, using the special USB cable that comes with the W2.


Dave Hachadorian, K6LL
Yuma, AZ

On 10/23/2021 8:53 AM, Dave wrote:

Hello,
Looking over the manual for the W2 I see no way to calibrate it. Did I 
miss something, or is there a way to perform a calibration on the 
wattmeter?

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Re: [Elecraft] Band pass filters

[David Hachadorian]

You need a filter on the TX radio to prevent its phase noise from being 
heard on other bands.  Just pressing PTT on the TX radio, even without 
putting out any measurable power, will raise the noise floor on multiple 
bands. With suitable band decoders driving filter selection, 
fast-switching between bands is possible.


Dave Hachadorian, K6LL
Yuma, AZ


On 7/27/2021 9:09 AM, CUTTER DAVID via Elecraft wrote:

Given the improved performance of modern transceivers, is there still a call 
for high specification W3NQN band pass filters in a 2-transmitter station?  For 
example on a Multi-2 contest environment.  For instance K3S + KPA + KAT. The 
filter fitted between radio and amplifier.

I have the *feeling* that a receive-only filter (with tx bypass) might be all 
that is needed.  This is much easier to implement than a full transmitter-rated 
set making fast switching between bands (eg for a quick look around) very quick 
and easy from the keyboard, etc.

David G3UNA
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--
Dave Hachadorian, K6LL
Big Bear Lake, AZ

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Re: [Elecraft] Tecsun portables

[David Hachadorian]

I use a Tecsun PL-660 for RFI tracking.  It is very sensitive, and has 
two steps of attenuation.  It has a jack for an external antenna, which 
disables the built-in whip. Frequency coverage is good.  It has a BFO, 
which is helpful in listening to certain types of noise.  It has a 
headphone jack which is good for a noisy outdoor environment.  I use 
alkaline batteries, and battery life is very good.  In the AM band, the 
built-in ferrite antenna is very directional.  I've never wished for a 
feature that it did not have.


Dave Hachadorian,
Yuma, AZ


On 7/27/2021 8:17 AM, Mike Harris via Elecraft wrote:

Hi,

Looking to replace my dead SW portable often used for RFI tracking.

Tecsun seem to be popular. Any suggestions which model?

Regards,

Mike VP8NO
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Dave Hachadorian, K6LL
Big Bear Lake, AZ

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Re: [Elecraft] Front end RF overload

[David Hachadorian]

Dale Farnsworth (call sign unknown) posted on Monday that the Mouser 
part number for the more robust version is 771-BAP64-04-T/R .  Maybe you 
missed it.  Mouser has over 4000 in stock at a price of $0.38, or 10 for 
$3.10.


Glad you found the problem.  It's a relatively easy fix.

Dave Hachadorian
Big Bear Lake, CA


On 7/20/2021 9:51 PM, Connie Marshall wrote:


Dave... thanks so much. The sensitivity returned when I did the J66 
jumper test. So looks like PIN diode D5 needs to be replaced. Looks 
like I can order from Mouser. Will do some digging and see if I can 
find the "more robust version".


73, Connie / K5CM

On 7/19/2021 12:08 AM, David Hachadorian wrote:

Try this:
https://marc.info/?l=elecraft&m=145323127930319&w=2

Unfortunately, the link near the bottom for the more robust 
replacement part doesn't work anymore, but maybe someone can come up 
with the part number.  I've got a bunch of them at home, but I'm on 
vacation.  The robust replacement is slightly larger in size, but it 
will still fit on the solder pads if you are careful.


Dave Hachadorian, K6LL
Big Bear Lake, CA



On 7/18/2021 9:34 PM, Connie Marshall wrote:
While operating SO2R the 'HIGH RF" warning flashed on the K3 
display. Before I could react and stop the transmission on the other 
radio the front end got zapped. The radio is down about 50 db on RX. 
I checked Ant 2 and RX antenna and the same problem so probably not 
the surge protectors on each of these inputs. Any ideas on what part 
goes out when this happens. The TX radio was on 20 meters and the RX 
radio was on 15 meters.


Connie / K5CM

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Yuma, AZ


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Dave Hachadorian, K6LL
Yuma, AZ

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Re: [Elecraft] Front end RF overload

[David Hachadorian]

Try this:
https://marc.info/?l=elecraft&m=145323127930319&w=2

Unfortunately, the link near the bottom for the more robust replacement 
part doesn't work anymore, but maybe someone can come up with the part 
number.  I've got a bunch of them at home, but I'm on vacation.  The 
robust replacement is slightly larger in size, but it will still fit on 
the solder pads if you are careful.


Dave Hachadorian, K6LL
Big Bear Lake, CA



On 7/18/2021 9:34 PM, Connie Marshall wrote:
While operating SO2R the 'HIGH RF" warning flashed on the K3 display. 
Before I could react and stop the transmission on the other radio the 
front end got zapped. The radio is down about 50 db on RX. I checked 
Ant 2 and RX antenna and the same problem so probably not the surge 
protectors on each of these inputs. Any ideas on what part goes out 
when this happens. The TX radio was on 20 meters and the RX radio was 
on 15 meters.


Connie / K5CM

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Dave Hachadorian, K6LL
Yuma, AZ

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