Date   

Re: KPA 1500 ATU Issue

K9MA
 

The first thing that occurs to me is that something is going wrong with the antennas or feedlines at high power. Does the SWR go high in the OPER position at 100 W, or only at higher power?  Does he have another amplifier he can try with those antennas?

Another possibility is that the ATU is actually failing, but that seem unlikely if the SWR goes back down at low power. I've been running my KPA1500 into antennas with over a 2:1 SWR for a couple years with no problems.


73,
Scott K9MA

On 7/2/2020 14:23, Jeff Clarke wrote:
A friend of mine has a KPA1500 that's having strange issues with the ATU. The SWR on his Hygain TH6 tri-bander is kind of high in the CW band because it's tuned for SSB. When he goes down to CW on 20 meters it's maybe a 2.4 :1 SWR. When you switch in the ATU with the amp in the standby position it gets the SWR down to an acceptable level. When you put the amp into the OPER position the SWR jumps up and causes the amp to fault. It also does this also for his 80 meter and 40 meter dipoles when you get away from the resonate frequency on those bands. Same issue with the TH6 on both 15 and 10 meters where it's not near the resonant frequency. This makes the amp pretty much unusable on frequencies where the SWR is around the 2:0 range or a little above that without putting an external antenna tuner is line after the output. He doesn't want to use it this way and risk blowing the final transistors again.

According to the KPA1500 manual  "At lower amplifier outputs up to about 800 W, or when using your driving transceiver “barefoot” at 100 W, the ATU will match loads up to an SWR of 10:1 on 80 through 10 meters and 5:1 on 160 and 6 meters. At 1500 W the tuner will match an SWR of about 3:1" The SWR on his antennas are well below these SWR readings but the ATU doesn't seem to be working as designed?. My friend is pretty frustrated right now because he just got his amp back from Elecraft (after having no amp for 4 months) to repair two final transistors that blew. He's only owned it for about 10 months. He was really looking forward to being HP again since he's not a LP guy. Lucky for him it was still under warranty and was fixed for free. I wasn't so lucky with my KPA500 and it cost me $600 to ship and have it repaired by Elecraft for blown final transistors.  Now he's not sure he wants to own a solid state amplifier that's so picky about SWR (and having to use an external antenna tuner) that he's just thinking about just selling it and going back to a tube amplifier.

Has anyone else had a similar issue with the ATU? I remember when he first bought the amp a little less than a year ago and we hooked it up it didn't act this way.

Jeff KU8E


-- 
Scott  K9MA

k9ma@...


KPA 1500 ATU Issue

Jeff Clarke
 

A friend of mine has a KPA1500 that's having strange issues with the ATU. The SWR on his Hygain TH6 tri-bander is kind of high in the CW band because it's tuned for SSB. When he goes down to CW on 20 meters it's maybe a 2.4 :1 SWR. When you switch in the ATU with the amp in the standby position it gets the SWR down to an acceptable level. When you put the amp into the OPER position the SWR jumps up and causes the amp to fault. It also does this also for his 80 meter and 40 meter dipoles when you get away from the resonate frequency on those bands. Same issue with the TH6 on both 15 and 10 meters where it's not near the resonant frequency. This makes the amp pretty much unusable on frequencies where the SWR is around the 2:0 range or a little above that without putting an external antenna tuner is line after the output. He doesn't want to use it this way and risk blowing the final transistors again.

According to the KPA1500 manual  "At lower amplifier outputs up to about 800 W, or when using your driving transceiver “barefoot” at 100 W, the ATU will match loads up to an SWR of 10:1 on 80 through 10 meters and 5:1 on 160 and 6 meters. At 1500 W the tuner will match an SWR of about 3:1" The SWR on his antennas are well below these SWR readings but the ATU doesn't seem to be working as designed?. My friend is pretty frustrated right now because he just got his amp back from Elecraft (after having no amp for 4 months) to repair two final transistors that blew. He's only owned it for about 10 months. He was really looking forward to being HP again since he's not a LP guy. Lucky for him it was still under warranty and was fixed for free. I wasn't so lucky with my KPA500 and it cost me $600 to ship and have it repaired by Elecraft for blown final transistors.  Now he's not sure he wants to own a solid state amplifier that's so picky about SWR (and having to use an external antenna tuner) that he's just thinking about just selling it and going back to a tube amplifier.

Has anyone else had a similar issue with the ATU? I remember when he first bought the amp a little less than a year ago and we hooked it up it didn't act this way.

Jeff KU8E


Re: REMOTE ON / OFF for K3

Robert W5AJ
 

Excellent
Thanks

The remote on/off of power at 120vac level is next.

73 W5AJ

On Tue, Jun 30, 2020, 2:56 PM David Robinson <g4fre@...> wrote:
I had a similar issue when wishing to power up the K3 at the remote station every time the 12V power supply was switched on. My solution was an 8 pin PIC, see http://g4fre.com/K3_poweron.htm.

Dave
WW2R
 


Re: Nothing on my monitor from the P3.

radio@ebillsharp.com
 

Thank you Klaas. 

Sherm
w8hi



On Jun 30, 2020, at 4:12 PM, . . via groups.io <pa3ggy@...> wrote:

Hi Guys.

Not had these issue with my line up, however had issues with flashing software. (K3 Bricked)
As Engineer having updated software "all my life" and having experience over here with the K3 - P3
I suggest to disconnect all cables *except for power), put serial cable in K3 only...flash required firmware.
once done take cable put in P3 only  ( make certain it is powered though) flash  required firmware.
Make certain K3 seems to operating normally.... if Ok then hook up P3. nothing else, check for improvement.
In case all ok, add additional monitors and whatever you fancy.
In case nothing hels, there is always Elecraft Tech support., they usually give a rapid response.

Just my 2 cents.

Good luck.

....73.....Klaas..........PA3GGY...........


Re: Using M1-M4 buttons DVR and N1MM, SSB, won't repeat...

Neil G
 

That was exactly the fix, Mike...per N1MM support...logger
doesn't know "length" of message...so add 5 sec to recorded
length of message...works fine now...
73,
Neil
AE1P


Re: REMOTE ON / OFF for K3

David Robinson
 

I had a similar issue when wishing to power up the K3 at the remote station every time the 12V power supply was switched on. My solution was an 8 pin PIC, see http://g4fre.com/K3_poweron.htm.

Dave
WW2R
 


Re: Nothing on my monitor from the P3.

. .
 

Hi Guys.

Not had these issue with my line up, however had issues with flashing software. (K3 Bricked)
As Engineer having updated software "all my life" and having experience over here with the K3 - P3
I suggest to disconnect all cables *except for power), put serial cable in K3 only...flash required firmware.
once done take cable put in P3 only  ( make certain it is powered though) flash  required firmware.
Make certain K3 seems to operating normally.... if Ok then hook up P3. nothing else, check for improvement.
In case all ok, add additional monitors and whatever you fancy.
In case nothing hels, there is always Elecraft Tech support., they usually give a rapid response.

Just my 2 cents.

Good luck.

....73.....Klaas..........PA3GGY...........


Re: P3 display flashing on/off.

Nolan - KI5IO
 

Friend of mine in Eastern Oregon Mountains was experiencing what seemed similar.  Tried all sorts of normal trouble-shooting steps with no resolution.

He was running WSJTx and monitoring WSPR.  When that APP was running the flashing was constant.

He finally did a clean removal of WSJTx and downloaded the current version, did the install ... turned on to where he was again monitoring WSPR and "no flashing".

May be a different type of flashing, but thought I would toss it into the mix of this conversation.

---
73 - Nolan K.
KI5IO


Re: P3 display flashing on/off.

W9BIK
 

Thanks Joe.

The thought that the PTT response is a red herring had occurred to me. That's one reason why I am not 100% sure whether its the K3s or the P3. You are correct that I do not have the TXMON option installed. However, when I disconnect the serial cable the flashing stops, or at least it did the few times I tried that. I try running it for a longer period with the serial cable disconnect tonight and see what happens.

Chuck


Re: P3 display flashing on/off.

Gerard <scanneg@...>
 

Mine is different, flashing in cold weather, nothing on K3 changes it.  So thinking electolytics P3


On Tue 30 Jun 2020, 19:22 W9BIK, <w9bik@...> wrote:
Hi Alan,

No, I have not tried that.  Maybe this evening after work I'll give that a try. Thanks for the suggestion.

I'm pretty sure the issue is in the K3s, probably on the KIO3B, but I am not quite ready to put money on that yet.  There is still a possibility it could be the P3, and I do need to somehow positively isolate the issue to either the K3s or P3. I am looking for a way to do that.

Keying up the K3s prevents the flashing, as does removing the RS232 cable. I don't see much in the P3 that would affect the entire display flashing by keying the TX or removing the cable other than changing display modes or loss of serial data. Maybe I'm missing something though, so at this point I am willing to try anything I have not yet tried.

Chuck


Re: P3 display flashing on/off.

Joe Subich, W4TV
 

I then discovered the flashing stops on the P3 while the K3s was
keyed up (PTT button on the front panel mike) and resumes when
un-keyed.
PTT is a red herring ... The display update is suspended in transmit
unless you have the TXMON option installed (which does not appear to
be the case).

73,

... Joe, W4TV


On 2020-06-30 12:39 PM, W9BIK wrote:
Hello fellow K3'ers...
Last night my P3 display started intermittently flashing on/off rapidly.  The entire display would rapidly flash on/off, including the border lines, function key menu, waterfall, etc.  Sometimes this will happen once, then again anywhere from several seconds to several minutes later. Other times it would start flashing and continue to flash rapidly for several seconds, then stop, then repeat a few seconds later. Every now and then it would start flashing continuously and I needed to cycle power on the K3s and P3. Very intermittent to say the least.
During my preliminary troubleshooting I noticed the flashing would stop when I disconnect the serial cable between the K3s and the P3. I re-seated the serial cable on both ends multiple times in an attempt to clean the contacts to no avail. I also re-seated the ribbon cable inside the P3 to no avail. I also tried re-seating the IF cable connecting the K3s and P3 multiple times, although the flashing would continue regardless if the IF cable was connected or not.  Thinking the serial cable may be intermittent, I tried moving the cables around, during both flashing on the display and when not flashing, and that had no effect. I also tried running a separate ground wire between the K3s and P3 - no difference. Note that this setup worked fine for a few years and just started happening.
I then discovered the flashing stops on the P3 while the K3s was keyed up (PTT button on the front panel mike) and resumes when un-keyed. This happened both in the K3s TX mode (RF out) and in the Test mode (no RF out). This, together with the flashing stopping when the serial cable is disconnected, led me to believe the K3s is at fault and not the P3.
So, before going any deeper into the troubleshooting, has anyone else experienced this issue or possibly have any insight as to its root cause?
Thanks,
Chuck
W9BIK


Re: Nothing on my monitor from the P3.

KE1F Lou
 

In my case bothe the P3 & external monitor flicker until it settles down and works properly.
Lou KE1F 



Sent from my Galaxy Tab® A

-------- Original message --------
From: radio@...
Date: 6/30/20 12:54 PM (GMT-05:00)
To: Elecraft-K3@groups.io
Subject: [Elecraft-K3] Nothing on my monitor from the P3.

I’m not able to get anything on my monitor from the P3.

When I plug in either the Elcraft or replacement 15 pin cable, between the ACC on the K3 and the RS232 port on the P3, The K3 freezes while the P3 works just fine

I’m trying to put the signal on a monitor again, as it was. 

I’ve tried rebooting and 

started from scratch using

EE INIT but 

get a NORM readout before it reverts to the frequency. 

Not was supposed to happen. 

Is this a simillar situation ?

Tnx, 

Sherm
w8hi




On Jun 30, 2020, at 12:42 PM, Gerard <scanneg@...> wrote:

Yeah, have this happening the last few years....especially in winter.  Think it might be capacitors.

Gerard EI5KF

On Tue 30 Jun 2020, 17:39 W9BIK, <w9bik@...> wrote:
Hello fellow K3'ers...

Last night my P3 display started intermittently flashing on/off rapidly.  The entire display would rapidly flash on/off, including the border lines, function key menu, waterfall, etc.  Sometimes this will happen once, then again anywhere from several seconds to several minutes later. Other times it would start flashing and continue to flash rapidly for several seconds, then stop, then repeat a few seconds later. Every now and then it would start flashing continuously and I needed to cycle power on the K3s and P3. Very intermittent to say the least.

During my preliminary troubleshooting I noticed the flashing would stop when I disconnect the serial cable between the K3s and the P3. I re-seated the serial cable on both ends multiple times in an attempt to clean the contacts to no avail. I also re-seated the ribbon cable inside the P3 to no avail. I also tried re-seating the IF cable connecting the K3s and P3 multiple times, although the flashing would continue regardless if the IF cable was connected or not.  Thinking the serial cable may be intermittent, I tried moving the cables around, during both flashing on the display and when not flashing, and that had no effect. I also tried running a separate ground wire between the K3s and P3 - no difference. Note that this setup worked fine for a few years and just started happening.

I then discovered the flashing stops on the P3 while the K3s was keyed up (PTT button on the front panel mike) and resumes when un-keyed. This happened both in the K3s TX mode (RF out) and in the Test mode (no RF out). This, together with the flashing stopping when the serial cable is disconnected, led me to believe the K3s is at fault and not the P3.

So, before going any deeper into the troubleshooting, has anyone else experienced this issue or possibly have any insight as to its root cause?

Thanks,

Chuck
W9BIK




Re: P3 display flashing on/off.

W9BIK
 

Hi Alan,

No, I have not tried that.  Maybe this evening after work I'll give that a try. Thanks for the suggestion.

I'm pretty sure the issue is in the K3s, probably on the KIO3B, but I am not quite ready to put money on that yet.  There is still a possibility it could be the P3, and I do need to somehow positively isolate the issue to either the K3s or P3. I am looking for a way to do that.

Keying up the K3s prevents the flashing, as does removing the RS232 cable. I don't see much in the P3 that would affect the entire display flashing by keying the TX or removing the cable other than changing display modes or loss of serial data. Maybe I'm missing something though, so at this point I am willing to try anything I have not yet tried.

Chuck


Re: P3 display flashing on/off.

Al N1AL
 

Hi Chuck,


Have you tried doing a Parameter Initialization?  (Described in the Troubleshooting section of the P3 manual.)


Alan N1AL


 


On 2020-06-30 10:39, W9BIK wrote:

Hello fellow K3'ers...

Last night my P3 display started intermittently flashing on/off rapidly.  The entire display would rapidly flash on/off, including the border lines, function key menu, waterfall, etc.  Sometimes this will happen once, then again anywhere from several seconds to several minutes later. Other times it would start flashing and continue to flash rapidly for several seconds, then stop, then repeat a few seconds later. Every now and then it would start flashing continuously and I needed to cycle power on the K3s and P3. Very intermittent to say the least.

During my preliminary troubleshooting I noticed the flashing would stop when I disconnect the serial cable between the K3s and the P3. I re-seated the serial cable on both ends multiple times in an attempt to clean the contacts to no avail. I also re-seated the ribbon cable inside the P3 to no avail. I also tried re-seating the IF cable connecting the K3s and P3 multiple times, although the flashing would continue regardless if the IF cable was connected or not.  Thinking the serial cable may be intermittent, I tried moving the cables around, during both flashing on the display and when not flashing, and that had no effect. I also tried running a separate ground wire between the K3s and P3 - no difference. Note that this setup worked fine for a few years and just started happening.

I then discovered the flashing stops on the P3 while the K3s was keyed up (PTT button on the front panel mike) and resumes when un-keyed. This happened both in the K3s TX mode (RF out) and in the Test mode (no RF out). This, together with the flashing stopping when the serial cable is disconnected, led me to believe the K3s is at fault and not the P3.

So, before going any deeper into the troubleshooting, has anyone else experienced this issue or possibly have any insight as to its root cause?

Thanks,

Chuck
W9BIK


Re: P3 display flashing on/off.

W9BIK
 

Here is a link to a video I shot showing the issue. Hopefully it is accessible from here.

https://photos.app.goo.gl/32VjRyny1gJmfx1Y8

Chuck
Wpbik
 


Re: P3 display flashing on/off.

W9BIK
 

Hi Gerard,

Maybe try swapping the two P3's and see if the symptoms stay with the old setup? If so, it would confirm the issue lies within the K3s.

Chuck
W9BIK


Nothing on my monitor from the P3.

radio@ebillsharp.com
 

I’m not able to get anything on my monitor from the P3.

When I plug in either the Elcraft or replacement 15 pin cable, between the ACC on the K3 and the RS232 port on the P3, The K3 freezes while the P3 works just fine

I’m trying to put the signal on a monitor again, as it was. 

I’ve tried rebooting and 

started from scratch using

EE INIT but 

get a NORM readout before it reverts to the frequency. 

Not was supposed to happen. 

Is this a simillar situation ?

Tnx, 

Sherm
w8hi




On Jun 30, 2020, at 12:42 PM, Gerard <scanneg@...> wrote:

Yeah, have this happening the last few years....especially in winter.  Think it might be capacitors.

Gerard EI5KF

On Tue 30 Jun 2020, 17:39 W9BIK, <w9bik@...> wrote:
Hello fellow K3'ers...

Last night my P3 display started intermittently flashing on/off rapidly.  The entire display would rapidly flash on/off, including the border lines, function key menu, waterfall, etc.  Sometimes this will happen once, then again anywhere from several seconds to several minutes later. Other times it would start flashing and continue to flash rapidly for several seconds, then stop, then repeat a few seconds later. Every now and then it would start flashing continuously and I needed to cycle power on the K3s and P3. Very intermittent to say the least.

During my preliminary troubleshooting I noticed the flashing would stop when I disconnect the serial cable between the K3s and the P3. I re-seated the serial cable on both ends multiple times in an attempt to clean the contacts to no avail. I also re-seated the ribbon cable inside the P3 to no avail. I also tried re-seating the IF cable connecting the K3s and P3 multiple times, although the flashing would continue regardless if the IF cable was connected or not.  Thinking the serial cable may be intermittent, I tried moving the cables around, during both flashing on the display and when not flashing, and that had no effect. I also tried running a separate ground wire between the K3s and P3 - no difference. Note that this setup worked fine for a few years and just started happening.

I then discovered the flashing stops on the P3 while the K3s was keyed up (PTT button on the front panel mike) and resumes when un-keyed. This happened both in the K3s TX mode (RF out) and in the Test mode (no RF out). This, together with the flashing stopping when the serial cable is disconnected, led me to believe the K3s is at fault and not the P3.

So, before going any deeper into the troubleshooting, has anyone else experienced this issue or possibly have any insight as to its root cause?

Thanks,

Chuck
W9BIK




Re: P3 display flashing on/off.

Gerard <scanneg@...>
 

It does not effect the external display.  And now I got a second newer K3S and other P3 for SO2R.  It has not happened yet on that setup.  Electolytics I'd say......some only have 1500hrs life.  I've not bothered to investigate yet....other priorities.....maybe this winter if I'm around, might investigate.

Gerard EI5KF

On Tue 30 Jun 2020, 17:45 KE1F Lou, <lmecseri@...> wrote:
I am having exactly the same issue.
Lou KE1F 



Sent from my Galaxy Tab® A

-------- Original message --------
From: W9BIK <w9bik@...>
Date: 6/30/20 12:39 PM (GMT-05:00)
Subject: [Elecraft-K3] P3 display flashing on/off.

Hello fellow K3'ers...

Last night my P3 display started intermittently flashing on/off rapidly.  The entire display would rapidly flash on/off, including the border lines, function key menu, waterfall, etc.  Sometimes this will happen once, then again anywhere from several seconds to several minutes later. Other times it would start flashing and continue to flash rapidly for several seconds, then stop, then repeat a few seconds later. Every now and then it would start flashing continuously and I needed to cycle power on the K3s and P3. Very intermittent to say the least.

During my preliminary troubleshooting I noticed the flashing would stop when I disconnect the serial cable between the K3s and the P3. I re-seated the serial cable on both ends multiple times in an attempt to clean the contacts to no avail. I also re-seated the ribbon cable inside the P3 to no avail. I also tried re-seating the IF cable connecting the K3s and P3 multiple times, although the flashing would continue regardless if the IF cable was connected or not.  Thinking the serial cable may be intermittent, I tried moving the cables around, during both flashing on the display and when not flashing, and that had no effect. I also tried running a separate ground wire between the K3s and P3 - no difference. Note that this setup worked fine for a few years and just started happening.

I then discovered the flashing stops on the P3 while the K3s was keyed up (PTT button on the front panel mike) and resumes when un-keyed. This happened both in the K3s TX mode (RF out) and in the Test mode (no RF out). This, together with the flashing stopping when the serial cable is disconnected, led me to believe the K3s is at fault and not the P3.

So, before going any deeper into the troubleshooting, has anyone else experienced this issue or possibly have any insight as to its root cause?

Thanks,

Chuck
W9BIK


Re: P3 display flashing on/off.

KE1F Lou
 

I am having exactly the same issue.
Lou KE1F 



Sent from my Galaxy Tab® A

-------- Original message --------
From: W9BIK <w9bik@...>
Date: 6/30/20 12:39 PM (GMT-05:00)
To: Elecraft-K3@groups.io
Subject: [Elecraft-K3] P3 display flashing on/off.

Hello fellow K3'ers...

Last night my P3 display started intermittently flashing on/off rapidly.  The entire display would rapidly flash on/off, including the border lines, function key menu, waterfall, etc.  Sometimes this will happen once, then again anywhere from several seconds to several minutes later. Other times it would start flashing and continue to flash rapidly for several seconds, then stop, then repeat a few seconds later. Every now and then it would start flashing continuously and I needed to cycle power on the K3s and P3. Very intermittent to say the least.

During my preliminary troubleshooting I noticed the flashing would stop when I disconnect the serial cable between the K3s and the P3. I re-seated the serial cable on both ends multiple times in an attempt to clean the contacts to no avail. I also re-seated the ribbon cable inside the P3 to no avail. I also tried re-seating the IF cable connecting the K3s and P3 multiple times, although the flashing would continue regardless if the IF cable was connected or not.  Thinking the serial cable may be intermittent, I tried moving the cables around, during both flashing on the display and when not flashing, and that had no effect. I also tried running a separate ground wire between the K3s and P3 - no difference. Note that this setup worked fine for a few years and just started happening.

I then discovered the flashing stops on the P3 while the K3s was keyed up (PTT button on the front panel mike) and resumes when un-keyed. This happened both in the K3s TX mode (RF out) and in the Test mode (no RF out). This, together with the flashing stopping when the serial cable is disconnected, led me to believe the K3s is at fault and not the P3.

So, before going any deeper into the troubleshooting, has anyone else experienced this issue or possibly have any insight as to its root cause?

Thanks,

Chuck
W9BIK


Re: P3 display flashing on/off.

Gerard <scanneg@...>
 

Yeah, have this happening the last few years....especially in winter.  Think it might be capacitors.

Gerard EI5KF

On Tue 30 Jun 2020, 17:39 W9BIK, <w9bik@...> wrote:
Hello fellow K3'ers...

Last night my P3 display started intermittently flashing on/off rapidly.  The entire display would rapidly flash on/off, including the border lines, function key menu, waterfall, etc.  Sometimes this will happen once, then again anywhere from several seconds to several minutes later. Other times it would start flashing and continue to flash rapidly for several seconds, then stop, then repeat a few seconds later. Every now and then it would start flashing continuously and I needed to cycle power on the K3s and P3. Very intermittent to say the least.

During my preliminary troubleshooting I noticed the flashing would stop when I disconnect the serial cable between the K3s and the P3. I re-seated the serial cable on both ends multiple times in an attempt to clean the contacts to no avail. I also re-seated the ribbon cable inside the P3 to no avail. I also tried re-seating the IF cable connecting the K3s and P3 multiple times, although the flashing would continue regardless if the IF cable was connected or not.  Thinking the serial cable may be intermittent, I tried moving the cables around, during both flashing on the display and when not flashing, and that had no effect. I also tried running a separate ground wire between the K3s and P3 - no difference. Note that this setup worked fine for a few years and just started happening.

I then discovered the flashing stops on the P3 while the K3s was keyed up (PTT button on the front panel mike) and resumes when un-keyed. This happened both in the K3s TX mode (RF out) and in the Test mode (no RF out). This, together with the flashing stopping when the serial cable is disconnected, led me to believe the K3s is at fault and not the P3.

So, before going any deeper into the troubleshooting, has anyone else experienced this issue or possibly have any insight as to its root cause?

Thanks,

Chuck
W9BIK

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