Date   

Re: [Elecraft_K3] TCXO Calibration methods

Mel Farrer <farrerfolks@...>
 

Wes, 
Interesting method, thanks.

Mel, K6KBE



From: "Wes wes@... [Elecraft_K3]"
To: Elecraft_K3@...
Sent: Thursday, January 11, 2018 8:23 AM
Subject: Re: [Elecraft_K3] TCXO Calibration methods

 
I described a fourth method some years ago.

http://elecraft..365791.n2.nabble.com/Ref-Osc-Cal-Method-4-tc2595451.html

These days I have a GPSDO in the shack so propagation is no longer an issue.

Wes  N7WS

On 1/10/2018 12:02 PM, farrerfolks@... [Elecraft_K3] wrote:
 
Hello All,

I have found that the frequency display and my transmitted signal is off by ~80-100 Hz.  Which of the three methods is the best?    

Mel, K6KBE




Re: [Elecraft_K3] TCXO Calibration methods

Bob McGraw - K4TAX
 

I use WSJT-X and the Freq Cal mode.  The setup is the same as used for WSJT-X.    I manually via the software select 2.5, 5.0, 10.0 and 15.0 MHz signals.  Typically the software returns a DF of less than 1 Hz.  If it is more than 1 Hz in error, I will by the K3S menu adjust the reference oscillator a few Hz.    My results have proven very successful and accurate with normalized errors of +/- <0.5Hz for frequencies measured. 

73

Bob, K4TAX



On 1/11/2018 4:00 AM, 'David G3YYD' g3yyd2@... [Elecraft_K3] wrote:
 

Mel

 

I use a very simple method.

 

CW mode on K3 tune in an on air standard frequency transmission. The higher the frequency the better but you need a reliable consistent signal. I normally use either 10000KHz or 9996KHz (Russian TX ideal for UK). K3 for minimum bandwidth and display to Hz rather than 10 of Hz. Switch on auto CW tune and press spot button to auto tune the signal. The display will then show the offset from the standard. Adjust the K3 reference frequency value, auto tune again. Repeat as necessary.

 

Due to different modulation schemes can only do this when there is a carrier or CW keying. It is best to avoid doing this with a disturbed geomagnetic field or dawn/dusk on the path as the ionosphere height and propagation mode can be  unstable causing some Doppler shift of the signal.

 

73 David G3YYD

 

From: Elecraft_K3@... [mailto:Elecraft_K3@...]
Sent: 10 January 2018 19:03
To: Elecraft_K3@...
Subject: [Elecraft_K3] TCXO Calibration methods

 




Hello All,

 

I have found that the frequency display and my transmitted signal is off by ~80-100 Hz.  Which of the three methods is the best?    

 

Mel, K6KBE






Re: [Elecraft_K3] TCXO Calibration methods

Wes
 

I described a fourth method some years ago.

http://elecraft.365791.n2.nabble.com/Ref-Osc-Cal-Method-4-tc2595451.html

These days I have a GPSDO in the shack so propagation is no longer an issue.

Wes  N7WS

On 1/10/2018 12:02 PM, farrerfolks@... [Elecraft_K3] wrote:
 

Hello All,


I have found that the frequency display and my transmitted signal is off by ~80-100 Hz.  Which of the three methods is the best?    


Mel, K6KBE



Re: K3 will Tune into an antenna but no Power on SSB or CW

Richard Jones
 

Ok further info..

It actually doesn't find a tune... I'm not sure if something has changed or if I just didn't notice earlier and presumed that it had tuned... but now it shows 5W on the display when tuning into a resonant antenna.. I hear the usually whirring and clicking from the tuner... when that stops it does display the "--"

I was a little reluctant to start really pulling the radio apart as it isn't mine... I'll have to confer with the club radio officer before proceeding but will pass on your suggested next step.

Thanks... I'll post as we move forward..

Richard // N2GBR


Re: [Elecraft_K3] TCXO Calibration methods

Mel Farrer <farrerfolks@...>
 

Thanks,

Mel, K6KBE



From: "'David G3YYD' g3yyd2@... [Elecraft_K3]" <Elecraft_K3@...>
To: Elecraft_K3@...
Sent: Thursday, January 11, 2018 2:00 AM
Subject: RE: [Elecraft_K3] TCXO Calibration methods

 
Mel
 
I use a very simple method.
 
CW mode on K3 tune in an on air standard frequency transmission. The higher the frequency the better but you need a reliable consistent signal.. I normally use either 10000KHz or 9996KHz (Russian TX ideal for UK). K3 for minimum bandwidth and display to Hz rather than 10 of Hz. Switch on auto CW tune and press spot button to auto tune the signal. The display will then show the offset from the standard. Adjust the K3 reference frequency value, auto tune again. Repeat as necessary.
 
Due to different modulation schemes can only do this when there is a carrier or CW keying. It is best to avoid doing this with a disturbed geomagnetic field or dawn/dusk on the path as the ionosphere height and propagation mode can be  unstable causing some Doppler shift of the signal.
 
73 David G3YYD
 
From: Elecraft_K3@... [mailto:Elecraft_K3@...]
Sent: 10 January 2018 19:03
To: Elecraft_K3@...
Subject: [Elecraft_K3] TCXO Calibration methods
 



Hello All,
 
I have found that the frequency display and my transmitted signal is off by ~80-100 Hz.  Which of the three methods is the best?    
 
Mel, K6KBE






Re: [Elecraft_K3] TCXO Calibration methods

Richard Smith
 

Wow! Great cal method. Thanks. KU4NZ. 

RAS



On Jan 11, 2018, at 4:00 AM, 'David G3YYD' g3yyd2@... [Elecraft_K3] <Elecraft_K3@...> wrote:

 

Mel

 

I use a very simple method.

 

CW mode on K3 tune in an on air standard frequency transmission. The higher the frequency the better but you need a reliable consistent signal. I normally use either 10000KHz or 9996KHz (Russian TX ideal for UK). K3 for minimum bandwidth and display to Hz rather than 10 of Hz. Switch on auto CW tune and press spot button to auto tune the signal. The display will then show the offset from the standard. Adjust the K3 reference frequency value, auto tune again. Repeat as necessary.

 

Due to different modulation schemes can only do this when there is a carrier or CW keying. It is best to avoid doing this with a disturbed geomagnetic field or dawn/dusk on the path as the ionosphere height and propagation mode can be  unstable causing some Doppler shift of the signal.

 

73 David G3YYD

 

From: Elecraft_K3@... [mailto:Elecraft_K3@...]
Sent: 10 January 2018 19:03
To: Elecraft_K3@...
Subject: [Elecraft_K3] TCXO Calibration methods

 




Hello All,

 

I have found that the frequency display and my transmitted signal is off by ~80-100 Hz.  Which of the three methods is the best?    

 

Mel, K6KBE





Re: K3 will Tune into an antenna but no Power on SSB or CW

AB1DD
 

Richard,
Will the display show dashes when the tune button is pushed? With a dummy load connected, can you increase power when in tune (transmitting a tone) then drop down to "0" by itself? If so, try re seating the ATU board.?


Re: [Elecraft_K3] TCXO Calibration methods

David G3YYD
 

Mel

 

I use a very simple method.

 

CW mode on K3 tune in an on air standard frequency transmission. The higher the frequency the better but you need a reliable consistent signal. I normally use either 10000KHz or 9996KHz (Russian TX ideal for UK). K3 for minimum bandwidth and display to Hz rather than 10 of Hz. Switch on auto CW tune and press spot button to auto tune the signal. The display will then show the offset from the standard. Adjust the K3 reference frequency value, auto tune again. Repeat as necessary.

 

Due to different modulation schemes can only do this when there is a carrier or CW keying. It is best to avoid doing this with a disturbed geomagnetic field or dawn/dusk on the path as the ionosphere height and propagation mode can be  unstable causing some Doppler shift of the signal.

 

73 David G3YYD

 

From: Elecraft_K3@... [mailto:Elecraft_K3@...]
Sent: 10 January 2018 19:03
To: Elecraft_K3@...
Subject: [Elecraft_K3] TCXO Calibration methods

 




Hello All,

 

I have found that the frequency display and my transmitted signal is off by ~80-100 Hz.  Which of the three methods is the best?    

 

Mel, K6KBE





Re: [Elecraft_K3] K3S and RTTY (FSK D)

Rich <rwnewbould@...>
 

Did you check long press on "DATA MD" that you are set to FSK and not PSK?

Rich


On 1/8/2018 19:19 PM, marsh308 marsh308@... [Elecraft_K3] wrote:
My K3S and running MMTTY, or WriteLog, RttyRite, and mtty.ocx, will no longer transmit RTTY (FSK D).

CW, SSB, and FT8 (DATA A) all still work okay. MMTTY, and WriteLog, RttyRite, and mtty.ocx worked okay before I tried to operate in the ARRL RTTY Roundup this weekend. What has changed from previously when it all worked is: Windows 10 updates, and the installation of NTP and WSJT-X.
I have reinstalled WriteLog (latest version), MMTTY 1.70, and the drivers for my hardware COM ports. Then I set up MMTTY again page by page from AA5AU 's website. Still no joy.

For ASK D I'm using the interface shown on page 99 of Fred Cady's K3S book - real COM port to K3S ACC for PTT and FSK in. It worked fine before, but not now.

Any suggestions sure would be appreciated.

73,
Marsh, KA5M







Sent from my Galaxy Tab A


Re: [Elecraft_K3] K3 output power erratic

Charles Garner
 

Thanks for that but I mentioned I'd already done that. Multiple times. I just drove to Elecraft and dropped off the rig. One convenience living in the Bay Area is having the Elecraft expertise just over the hill from me. Cheaper and faster to drive it over in the Honda than to mail it!  I will advise the group regarding what they find. A couple weeks to play with the HT-37 and Viking Ranger, a roughly 60 year step back in technology. Fun simple tube stuff. 
72 N6AF Chuck

On Jan 10, 2018, at 8:07 AM, Bob McGraw K4TAX RMcGraw@... [Elecraft_K3] <Elecraft_K3@...> wrote:

 

Since you have a good dummy load and a clean test setup, I'd suggest you run the Calibrate Transmitter Gain as found with the Elecraft Utility.    

73

Bob, K4TAX


On 1/10/2018 8:35 AM, Charles Garner skyviewcharles@... [Elecraft_K3] wrote:
 

About a year ago I sent my K3 to Elecraft due to the output power behaving erratically on AM operation. Now it started acting up once again. This time on bands higher than 14 MHz the output power can take several seconds to ramp up to 100 Watts output. I'm referring to already having the output power control set for 100 Watts and then pressing the XMT button or setting to FM mode and keying the mic; in other words simply commanding the K3 to put out a 100 Watt carrier. Sometimes on 29 MHz it's particularly bad and will sit at about 50 Watts for 15 seconds and then slowly creep up to 100. Sometimes it initially continues past 100 and stops around 115 Watts and then settles back to 100.
Thor original repair replaced the driver and final FETs within the LPA and also changed to new gold faceplate connector pins.
So I opened it up and found that Q3 on the LPA was blown "open". Q3 is the bias control switch, an SMT bipolar transistor. I honed my SMT skills and I replaced Q3. I also replaced the LPA's driver and final FETs; in other words the 3 primary FETs in the LPA. I tried FW versions 5.60 and 5.50. I reseated the faceplate connections. I ran the transmit gain alignment and it fails usually on the 29 MHz cycle. The error message states "power cannot settle". One hint is I checked the transmitter gains and all look reasonable except 29 MHz which shows a gain of 115 for the HPA. Another hint on 29 MHz is the HI CURRENT warning shows occasionally.
Since the HPA does output 100 W I conclude it's not the issue. I also conclude that the LPA is OK especially since I just changed all of its FETs. So what else is there to cause a slow ramp up in power? Keep in mind this problem is only seen at frequency bands higher than 14 MHz albeit perhaps it's just slightly doing it on 14 MHz. The rig operates apparently perfectly from 10 MHz on down to 1.8 MHz.

Has anyone seen this erratic power behavior and if so what was the root cause? Thanks in advance.

Problem in low pass filter sections? Spurious output? Bad connection from output board to antenna connector on back panel?

All the testing is being done into a known good 50 Ohm dummy load. The test setup is clean.

73 N6AF Frustrated Chuck



Re: [Elecraft_K3] K3 output power erratic

Wes
 

He said he ran it. 


On Jan 10, 2018, at 9:07 AM, Bob McGraw K4TAX RMcGraw@... [Elecraft_K3] <Elecraft_K3@...> wrote:

 

Since you have a good dummy load and a clean test setup, I'd suggest you run the Calibrate Transmitter Gain as found with the Elecraft Utility.    

73

Bob, K4TAX


On 1/10/2018 8:35 AM, Charles Garner skyviewcharles@... [Elecraft_K3] wrote:
 

About a year ago I sent my K3 to Elecraft due to the output power behaving erratically on AM operation. Now it started acting up once again. This time on bands higher than 14 MHz the output power can take several seconds to ramp up to 100 Watts output. I'm referring to already having the output power control set for 100 Watts and then pressing the XMT button or setting to FM mode and keying the mic; in other words simply commanding the K3 to put out a 100 Watt carrier. Sometimes on 29 MHz it's particularly bad and will sit at about 50 Watts for 15 seconds and then slowly creep up to 100. Sometimes it initially continues past 100 and stops around 115 Watts and then settles back to 100.
Thor original repair replaced the driver and final FETs within the LPA and also changed to new gold faceplate connector pins.
So I opened it up and found that Q3 on the LPA was blown "open". Q3 is the bias control switch, an SMT bipolar transistor. I honed my SMT skills and I replaced Q3. I also replaced the LPA's driver and final FETs; in other words the 3 primary FETs in the LPA. I tried FW versions 5.60 and 5.50. I reseated the faceplate connections. I ran the transmit gain alignment and it fails usually on the 29 MHz cycle. The error message states "power cannot settle". One hint is I checked the transmitter gains and all look reasonable except 29 MHz which shows a gain of 115 for the HPA. Another hint on 29 MHz is the HI CURRENT warning shows occasionally.
Since the HPA does output 100 W I conclude it's not the issue. I also conclude that the LPA is OK especially since I just changed all of its FETs. So what else is there to cause a slow ramp up in power? Keep in mind this problem is only seen at frequency bands higher than 14 MHz albeit perhaps it's just slightly doing it on 14 MHz. The rig operates apparently perfectly from 10 MHz on down to 1.8 MHz.

Has anyone seen this erratic power behavior and if so what was the root cause? Thanks in advance.

Problem in low pass filter sections? Spurious output? Bad connection from output board to antenna connector on back panel?

All the testing is being done into a known good 50 Ohm dummy load. The test setup is clean.

73 N6AF Frustrated Chuck



K3 REF TCXO calibration

farrerfolks@...
 

Which of the three methods in the manual is preferred?


Mel, K6KBE


TCXO Calibration methods

farrerfolks@...
 

Hello All,


I have found that the frequency display and my transmitted signal is off by ~80-100 Hz.  Which of the three methods is the best?    


Mel, K6KBE


K3 will Tune into an antenna but no Power on SSB or CW

Richard Jones
 

I have been trying to help get a SK's K3 radio operational where it was found that there is no O/P power showing on the display in SSB or CW modes on any band.

My initial review I noted that the Filters were installed in the wrong order so I switched them around and updated the Configs for each...Still no power on Key down or SSB.... however that did allow the radio to show 5W on the display when I hit the ATU Tune button.... but the tuner doesn't resolve a tuning solution even into a resonate dipole

Next I noticed that there was no relay click when adjusting the POWER knob through the 10W threshold..

In a bold step I decided to match the CONFIG menu choices to my own radio..  made some section changes and now the radio offers that click as you move through the 10W threas-hold.

Still no power showing in either SSB or CW modes. Note that the Radio does illuminate the TX LED and still tunes with 5W showing on the display... but no tuning solution.

Has anyone experienced this previously or have any test-function ideas for me to try?

The Radio is a 4000ish serial number, built at the factory, did operate a one time or another with five 8-pole filters and 100W PA, DVR and ATU installed.. no second receiver.

Thanks for any help..

Richard // N2GBR



Re: [Elecraft_K3] K3 output power erratic

Dave (NK7Z)
 

My K3 creeps up in power as well, and sometimes on 28 it cuts out... I
will be most interested in this thread...


73s and thanks,
Dave
NK7Z
http://www.nk7z.net


On 01/10/2018 06:35 AM, Charles Garner skyviewcharles@...
[Elecraft_K3] wrote:
About a year ago I sent my K3 to Elecraft due to the output power
behaving erratically on AM operation. Now it started acting up once
again. This time on bands higher than 14 MHz the output power can take
several seconds to ramp up to 100 Watts output. I'm referring to already
having the output power control set for 100 Watts and then pressing the
XMT button or setting to FM mode and keying the mic; in other words
simply commanding the K3 to put out a 100 Watt carrier. Sometimes on 29
MHz it's particularly bad and will sit at about 50 Watts for 15 seconds
and then slowly creep up to 100. Sometimes it initially continues past
100 and stops around 115 Watts and then settles back to 100.
Thor original repair replaced the driver and final FETs within the LPA
and also changed to new gold faceplate connector pins.
So I opened it up and found that Q3 on the LPA was blown "open". Q3 is
the bias control switch, an SMT bipolar transistor. I honed my SMT
skills and I replaced Q3. I also replaced the LPA's driver and final
FETs; in other words the 3 primary FETs in the LPA. I tried FW versions
5.60 and 5.50. I reseated the faceplate connections. I ran the transmit
gain alignment and it fails usually on the 29 MHz cycle. The error
message states "power cannot settle". One hint is I checked the
transmitter gains and all look reasonable except 29 MHz which shows a
gain of 115 for the HPA. Another hint on 29 MHz is the HI CURRENT
warning shows occasionally.
Since the HPA does output 100 W I conclude it's not the issue. I also
conclude that the LPA is OK especially since I just changed all of its
FETs. So what else is there to cause a slow ramp up in power? Keep in
mind this problem is only seen at frequency bands higher than 14 MHz
albeit perhaps it's just slightly doing it on 14 MHz. The rig operates
apparently perfectly from 10 MHz on down to 1.8 MHz.

Has anyone seen this erratic power behavior and if so what was the root
cause? Thanks in advance.

Problem in low pass filter sections? Spurious output? Bad connection
from output board to antenna connector on back panel?

All the testing is being done into a known good 50 Ohm dummy load. The
test setup is clean.

73 N6AF Frustrated Chuck


Re: [Elecraft_K3] K3 output power erratic

Bob McGraw - K4TAX
 

Since you have a good dummy load and a clean test setup, I'd suggest you run the Calibrate Transmitter Gain as found with the Elecraft Utility.    

73

Bob, K4TAX


On 1/10/2018 8:35 AM, Charles Garner skyviewcharles@... [Elecraft_K3] wrote:
 

About a year ago I sent my K3 to Elecraft due to the output power behaving erratically on AM operation. Now it started acting up once again. This time on bands higher than 14 MHz the output power can take several seconds to ramp up to 100 Watts output. I'm referring to already having the output power control set for 100 Watts and then pressing the XMT button or setting to FM mode and keying the mic; in other words simply commanding the K3 to put out a 100 Watt carrier. Sometimes on 29 MHz it's particularly bad and will sit at about 50 Watts for 15 seconds and then slowly creep up to 100. Sometimes it initially continues past 100 and stops around 115 Watts and then settles back to 100.
Thor original repair replaced the driver and final FETs within the LPA and also changed to new gold faceplate connector pins.
So I opened it up and found that Q3 on the LPA was blown "open". Q3 is the bias control switch, an SMT bipolar transistor. I honed my SMT skills and I replaced Q3. I also replaced the LPA's driver and final FETs; in other words the 3 primary FETs in the LPA. I tried FW versions 5.60 and 5.50. I reseated the faceplate connections. I ran the transmit gain alignment and it fails usually on the 29 MHz cycle. The error message states "power cannot settle". One hint is I checked the transmitter gains and all look reasonable except 29 MHz which shows a gain of 115 for the HPA. Another hint on 29 MHz is the HI CURRENT warning shows occasionally.
Since the HPA does output 100 W I conclude it's not the issue. I also conclude that the LPA is OK especially since I just changed all of its FETs. So what else is there to cause a slow ramp up in power? Keep in mind this problem is only seen at frequency bands higher than 14 MHz albeit perhaps it's just slightly doing it on 14 MHz. The rig operates apparently perfectly from 10 MHz on down to 1.8 MHz.

Has anyone seen this erratic power behavior and if so what was the root cause? Thanks in advance.

Problem in low pass filter sections? Spurious output? Bad connection from output board to antenna connector on back panel?

All the testing is being done into a known good 50 Ohm dummy load. The test setup is clean.

73 N6AF Frustrated Chuck



K3 output power erratic

Charles Garner
 

About a year ago I sent my K3 to Elecraft due to the output power behaving erratically on AM operation. Now it started acting up once again. This time on bands higher than 14 MHz the output power can take several seconds to ramp up to 100 Watts output. I'm referring to already having the output power control set for 100 Watts and then pressing the XMT button or setting to FM mode and keying the mic; in other words simply commanding the K3 to put out a 100 Watt carrier. Sometimes on 29 MHz it's particularly bad and will sit at about 50 Watts for 15 seconds and then slowly creep up to 100. Sometimes it initially continues past 100 and stops around 115 Watts and then settles back to 100.
Thor original repair replaced the driver and final FETs within the LPA and also changed to new gold faceplate connector pins.
So I opened it up and found that Q3 on the LPA was blown "open". Q3 is the bias control switch, an SMT bipolar transistor. I honed my SMT skills and I replaced Q3. I also replaced the LPA's driver and final FETs; in other words the 3 primary FETs in the LPA. I tried FW versions 5.60 and 5.50. I reseated the faceplate connections. I ran the transmit gain alignment and it fails usually on the 29 MHz cycle. The error message states "power cannot settle". One hint is I checked the transmitter gains and all look reasonable except 29 MHz which shows a gain of 115 for the HPA. Another hint on 29 MHz is the HI CURRENT warning shows occasionally.
Since the HPA does output 100 W I conclude it's not the issue. I also conclude that the LPA is OK especially since I just changed all of its FETs. So what else is there to cause a slow ramp up in power? Keep in mind this problem is only seen at frequency bands higher than 14 MHz albeit perhaps it's just slightly doing it on 14 MHz. The rig operates apparently perfectly from 10 MHz on down to 1.8 MHz.

Has anyone seen this erratic power behavior and if so what was the root cause? Thanks in advance.

Problem in low pass filter sections? Spurious output? Bad connection from output board to antenna connector on back panel?

All the testing is being done into a known good 50 Ohm dummy load. The test setup is clean.

73 N6AF Frustrated Chuck


K3S and RTTY (FSK D)

marsh308 <marsh308@...>
 

My K3S and running MMTTY, or WriteLog, RttyRite, and mtty.ocx, will no longer transmit RTTY (FSK D).

CW, SSB, and FT8 (DATA A) all still work okay. MMTTY, and WriteLog, RttyRite, and mtty.ocx worked okay before I tried to operate in the ARRL RTTY Roundup this weekend. What has changed from previously when it all worked is: Windows 10 updates, and the installation of NTP and WSJT-X.
I have reinstalled WriteLog (latest version), MMTTY 1.70, and the drivers for my hardware COM ports. Then I set up MMTTY again page by page from AA5AU 's website. Still no joy.

For ASK D I'm using the interface shown on page 99 of Fred Cady's K3S book - real COM port to K3S ACC for PTT and FSK in. It worked fine before, but not now.

Any suggestions sure would be appreciated.

73,
Marsh, KA5M







Sent from my Galaxy Tab A


Re: Elecraft K3 relay contact sound

yo7mgg@...
 

Tnx for help. I try that, i made the calibration again and this symptoms are only when the temperature i low than 20 degree C...I already made the calibration for PA temp and FP temp...

73, Stefan YO7SR


Re: Elecraft K3 relay contact sound

Richard Hubbard
 

 Try to re-seat the PA unit then reload your configuration file, then rerun the PA gain settings (5 and 50w). If you still have problems, I would advise contacting Elecraft customer support. 

Best regards,

Richard Hubbard
Tel: +44 (0)1380 723853
Mob +44 (0)7500019709
Email: richhubbard_uk@...



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