Date   

Re: [Elecraft_K3] Popping Noise

ab2tc
 

Hi,

Yes, there is a pop when turning power on and another when turning off. Truth is that all solid state audio amplifiers with an output that is coupled with a capacitor (almost always the case with smaller amplifiers) exhibit this. I do not think you have to worry about speaker damage.

AB2TC - Knut


---In Elecraft_K3@..., <dj2001x@...> wrote :

I have not had this happen with my K3s or my older K3.

Dale, K9VUJ


On 20, Aug 2016, at 14:22, Mike Morrow w3qt@... [Elecraft_K3] <Elecraft_K3@...> wrote:



Mike,

I'm a little concerned about possible cone damage. That's why I am wondering if others are hearing the same thing.

73,

Mike, W3QT


On 8/20/2016 2:43 PM, mikerodgerske5gbc@... [Elecraft_K3] wrote:
> I think my k3 does that. Didn't know it was a problem.
>
> 73
> Mike R
>
> Find me on "Zello", a walkie talkie or handi talkie type app. I'm listed as KE5GBC. I'm mostly on late at night.
>
> On Aug 20, 2016, at 12:05 PM, "w3qt@... [Elecraft_K3]" <Elecraft_K3@...> wrote:
>
>>
>> I'm running a K3s and have a popping noise through the external speaker when turning on the rig and to a lesser extent when turning it off. I recently changed speakers, thinking maybe a change would help, but the issue is still there. I'm currently using a TenTec 307B speaker. I've checked the cabling and terminals and tried a few different shunt capacitors across the speaker termnals. Does anyone else have a similar issue? Any ideas what to try next? Thanks.
>>
>> 73,
>> Mike, W3QT
>>
>>
>>


Re: [Elecraft_K3] change the processor board?

harry latterman <harrylatterman@...>
 

Chas

What is the S/N of your radio... As mentioned you might have a older one without the gold contacts. I have two K3's and one is like that. I had TX die on me and once I pulled the AMP out and clean the contacts it has been working fine ever since... In you case I suspect it is the front panel board. Easy...well not really easy.. fix will be to pull the front panel off and clean contracts and plug it back in.. The reason I said not really easy is there are a lot of pins connecting the front panel and DSP board to the main board.  I was give and dead K3 and had fun bringing life into it. In my case I had to send the front panel+DSP board in since I had 5 push buttons that did not work. Less then 2 weeks later I got boards back and completed the repair, which lead me to the pins on the AMP module...which are tinned and not gold..

2 cents  back under my rock...Good luck and hope this suggestion helps

73 Harry K7ZOV



From: "skyviewcharles@... [Elecraft_K3]"
To: Elecraft_K3@...
Sent: Sunday, August 21, 2016 9:50 AM
Subject: [Elecraft_K3] change the processor board?

 
My K3 now has two distinct bugs.  One bug that's been present for several months occurs during the first few minutes of warm-up (until the indicated FacePlate FP temperature is above about 27C), when I turn the VFO control the relays click and the freq jumps to an arbitrary and non-standard value such as 246.200 MHz.  Yes, I wrote two hundred and forty six point two Megahertz.  The second bug is more recent and highly frustrating.  Only on 75/80 meter band does this occur.  After about one minute of transmission the output power will drop back from 100 W down to about 35 W (CW output for example or simply pressing XMIT to send a constant carrier) .  The only way to clear this condition is by turning off the rig and turning it back on.  This is when running into a known good 50 Ohm dummy load.  It's not heat related, it's not the SWR foldback function kicking in.  Nothing like that.  It appears to be a "control related bug'.  When it is limited to about 35 W out (Bird Wattmeter), adjusting the power out control indicates "100 W" but it's outputting about 35 Watts.  All other bands do not do this while the rig is confirmed in this trouble condition on 75/80 meters.  In other words when the power is limited to about 35 W out on 75/80 meters I confirmed a proper 100 W out on all other bands.  Very strange to be limited to the one band.

My question to the K3 owners out there - have any of you had similar apparent processor related bugs and simply shot gunned the repair by changing out the main board that contains the uP?  That may be less expensive than pursuing the formal evaluation/repair approach.

Thanks for any suggestions.  I know I can send it to the K3 hospital but it's not covered by Obamacare (yet anyway) so I'm looking at other possible approaches.  Anybody been down this buggy road?

73 N6AF Chas



Re: [Elecraft_K3] change the processor board?

dalej <dj2001x@...>
 

Never had the trouble on either of my 2 K3’s.

Have you had the covers off and checked all the plugs and readily accessible connections?

Yes, calling Elecraft support is a good idea. They might have some good ideas for you to try.

73
Dale, K9VUJ


My question to the K3 owners out there - have any of you had similar apparent processor related bugs

73 N6AF Chas


K3 Key Out - Let the Metal out of an IRFI630G MOSFET

Max NG7M
 

NG7M Max here... raising my hand with no shame! I pulled off frying the beefy Power MOSFET used on the K3 Key Out.  On the Schematic / PCB, it's Q3.  It's clear I ran 5+ amps through it.  This post might help someone else, because I didn't find any other posts in my short search where someone else was 'dumber than a bag of hammers' like me... maybe they were smarter and didn't fess up to it! :) (Jim W7CT, you can't post.  I'm not in the mood to take any crap from you! LOL!)


Here is a nice picture of what it looks like on an IRFI630 when you do this: (nice crack and molten metal ooz)


So my real question is... is there anything else to worry about?  I can't see anything else on the PCB around Q3 that appears to be funky.  I just ordered up 2 more 630's from mouser so I'll be able to fry another if so desired.  My K3 is working it appears, minus the keying.  It's not fun when you smell the smoke and it's coming from inside of your K3 case.  Needless to say, I dropped a few choice words.


For reference, which the next poor slob find helpful , here is the replacement on Mouser:


http://www.mouser.com/Search/ProductDetail.aspx?R=IRFI630GPBFvirtualkey61370000virtualkey844-IRFI630GPBF


So if you are still reading, what I was working on at my QTH where I run the NC7J DX Cluster and NC7J Skimmer Server was a keying interface so when I key my K3 it would cut the power to a couple of preamps I'm running on the antenna setup with the QS1R receiver.  I obviously have some issues with my hack design.


Please be gentle if you respond. ;)


Max NG7M




Re: [Elecraft_K3] change the processor board?

Geoffrey Downs
 

If your K3 is an older one that doesn’t have gold pins for the front panel, it might be oxidation on some of the pins. It might not be, of course, but it may be worth checking by removing the front panel, cleaning the pins and putting it back, maybe even with a little Deoxit or Contralube on them. I’ve not had exactly the same faults with my senior K3 (#266) but twice over its 8+ yr life have had esoteric happenings relating to frequency, power or error messages that were cured by doing this.
 
GL es 73
 
Geoff
G3UCK
 

Sent: 21 August, 2016 5:50 PM
Subject: [Elecraft_K3] change the processor board?
 
 

My K3 now has two distinct bugs.  One bug that's been present for several months occurs during the first few minutes of warm-up (until the indicated FacePlate FP temperature is above about 27C), when I turn the VFO control the relays click and the freq jumps to an arbitrary and non-standard value such as 246.200 MHz.  Yes, I wrote two hundred and forty six point two Megahertz.  The second bug is more recent and highly frustrating.  Only on 75/80 meter band does this occur.  After about one minute of transmission the output power will drop back from 100 W down to about 35 W (CW output for example or simply pressing XMIT to send a constant carrier) .  The only way to clear this condition is by turning off the rig and turning it back on.  This is when running into a known good 50 Ohm dummy load.  It's not heat related, it's not the SWR foldback function kicking in.  Nothing like that.  It appears to be a "control related bug'.  When it is limited to about 35 W out (Bird Wattmeter), adjusting the power out control indicates "100 W" but it's outputting about 35 Watts.  All other bands do not do this while the rig is confirmed in this trouble condition on 75/80 meters.  In other words when the power is limited to about 35 W out on 75/80 meters I confirmed a proper 100 W out on all other bands.  Very strange to be limited to the one band.

My question to the K3 owners out there - have any of you had similar apparent processor related bugs and simply shot gunned the repair by changing out the main board that contains the uP?  That may be less expensive than pursuing the formal evaluation/repair approach.

Thanks for any suggestions.  I know I can send it to the K3 hospital but it's not covered by Obamacare (yet anyway) so I'm looking at other possible approaches.  Anybody been down this buggy road?

73 N6AF Chas




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change the processor board?

ab
 

My K3 now has two distinct bugs.  One bug that's been present for several months occurs during the first few minutes of warm-up (until the indicated FacePlate FP temperature is above about 27C), when I turn the VFO control the relays click and the freq jumps to an arbitrary and non-standard value such as 246.200 MHz.  Yes, I wrote two hundred and forty six point two Megahertz.  The second bug is more recent and highly frustrating.  Only on 75/80 meter band does this occur.  After about one minute of transmission the output power will drop back from 100 W down to about 35 W (CW output for example or simply pressing XMIT to send a constant carrier) .  The only way to clear this condition is by turning off the rig and turning it back on.  This is when running into a known good 50 Ohm dummy load.  It's not heat related, it's not the SWR foldback function kicking in.  Nothing like that.  It appears to be a "control related bug'.  When it is limited to about 35 W out (Bird Wattmeter), adjusting the power out control indicates "100 W" but it's outputting about 35 Watts.  All other bands do not do this while the rig is confirmed in this trouble condition on 75/80 meters.  In other words when the power is limited to about 35 W out on 75/80 meters I confirmed a proper 100 W out on all other bands.  Very strange to be limited to the one band.

My question to the K3 owners out there - have any of you had similar apparent processor related bugs and simply shot gunned the repair by changing out the main board that contains the uP?  That may be less expensive than pursuing the formal evaluation/repair approach.

Thanks for any suggestions.  I know I can send it to the K3 hospital but it's not covered by Obamacare (yet anyway) so I'm looking at other possible approaches.  Anybody been down this buggy road?

73 N6AF Chas


Re: [Elecraft_K3] Popping Noise

dalej <dj2001x@...>
 

I have not had this happen with my K3s or my older K3.

Dale, K9VUJ

On 20, Aug 2016, at 14:22, Mike Morrow w3qt@comcast.net [Elecraft_K3] <Elecraft_K3@yahoogroups.com> wrote:



Mike,

I'm a little concerned about possible cone damage. That's why I am wondering if others are hearing the same thing.

73,

Mike, W3QT


On 8/20/2016 2:43 PM, mikerodgerske5gbc@yahoo.com [Elecraft_K3] wrote:
I think my k3 does that. Didn't know it was a problem.

73
Mike R

Find me on "Zello", a walkie talkie or handi talkie type app. I'm listed as KE5GBC. I'm mostly on late at night.

On Aug 20, 2016, at 12:05 PM, "w3qt@comcast.net [Elecraft_K3]" <Elecraft_K3@yahoogroups.com> wrote:


I'm running a K3s and have a popping noise through the external speaker when turning on the rig and to a lesser extent when turning it off. I recently changed speakers, thinking maybe a change would help, but the issue is still there. I'm currently using a TenTec 307B speaker. I've checked the cabling and terminals and tried a few different shunt capacitors across the speaker termnals. Does anyone else have a similar issue? Any ideas what to try next? Thanks.

73,
Mike, W3QT



Re: [Elecraft_K3] Popping Noise

w3qt_mike
 

Mike,

I'm a little concerned about possible cone damage.  That's why I am wondering if others are hearing the same thing.

73,

Mike, W3QT


On 8/20/2016 2:43 PM, mikerodgerske5gbc@... [Elecraft_K3] wrote:
 
I think my k3 does that. Didn't know it was a problem. 

73
Mike R

Find me on "Zello", a walkie talkie or handi talkie type app. I'm listed as KE5GBC. I'm mostly on late at night. 

On Aug 20, 2016, at 12:05 PM, "w3qt@... [Elecraft_K3]" <Elecraft_K3@...> wrote:

 

I'm running a K3s and have a popping noise through the external speaker when turning on the rig and to a lesser extent when turning it off.  I recently changed speakers, thinking maybe a change would help, but the issue is still there.  I'm currently using a TenTec 307B speaker.  I've checked the cabling and terminals and tried a few different shunt capacitors across the speaker termnals.  Does anyone else have a similar issue?  Any ideas what to try next?  Thanks.

73,
Mike, W3QT




Re: [Elecraft_K3] Popping Noise

mikerodgerske5gbc
 

I think my k3 does that. Didn't know it was a problem. 

73
Mike R

Find me on "Zello", a walkie talkie or handi talkie type app. I'm listed as KE5GBC. I'm mostly on late at night. 

On Aug 20, 2016, at 12:05 PM, "w3qt@... [Elecraft_K3]" <Elecraft_K3@...> wrote:

 

I'm running a K3s and have a popping noise through the external speaker when turning on the rig and to a lesser extent when turning it off.  I recently changed speakers, thinking maybe a change would help, but the issue is still there.  I'm currently using a TenTec 307B speaker.  I've checked the cabling and terminals and tried a few different shunt capacitors across the speaker termnals.  Does anyone else have a similar issue?  Any ideas what to try next?  Thanks.

73,
Mike, W3QT



Popping Noise

w3qt_mike
 

I'm running a K3s and have a popping noise through the external speaker when turning on the rig and to a lesser extent when turning it off.  I recently changed speakers, thinking maybe a change would help, but the issue is still there.  I'm currently using a TenTec 307B speaker.  I've checked the cabling and terminals and tried a few different shunt capacitors across the speaker termnals.  Does anyone else have a similar issue?  Any ideas what to try next?  Thanks.

73,
Mike, W3QT



Re: Displaying second receiver RTTY text during split operation

K2MK@...
 

Hi Jim,

It's a good question. The P3 text is merely a repeat of the K3 decoded text. I don't think the K3 has provision for reading text from VFO-B. But there are alternatives if you are also using a PC. You could continue having the P3 display VFO-A text and use your PC RTTY program to display VFO B text merely by directing the right audio channel to the PC.

Also PC RTTY programs like MMTTY have dual display capability. MMTTY calls it a clone window. Once both windows are up you choose which audio channel goes to which window. If you use MMTTY as an add-in to a contest program some capabilities might not be available. It depends on how the contest program handles the plug-in. I know it worked in WriteLog but I haven't yet figured out how to do it using N1MM.

73,
Mike K2MK


---In Elecraft_K3@..., <aa8oy@...> wrote :

I recently purchased a keyboard to plug into my P3 and used it for RTTY, displaying text on the second monitor. When the station I was copying went to split operation, I wonder if it is possible to display text from both receivers simultaneously.  Has anyone done this and if so how.


Jim, AA8OY


Re: [Elecraft_K3] k3dspupgrd

David Kowalewski <djkowalewski@...>
 

Thanks George for the reply, I also ride and the hearing is'nt what it use to be either! I like the K3 a lot, I just am after the biggest bang for my buck when it comes to mods, I only work CW and am more a casual operator. Thanks again George
73’s
WA2OXZ 
Dave 

On Aug 16, 2016, at 10:24 AM, 'Gmail - George' gdanner12@... [Elecraft_K3] <Elecraft_K3@...> wrote:


I did the upgrade by swapping out boards.
 
My recall = The major change was the addition of a low pass filter to eliminate a “leak through” of the D to A clock.
At the time, there were complaints by several users that there was a high frequency noise in the K3 that was tiring when using the K3 for long periods.
Also improved the low freq response of the audio – don’t remember the complaint.
 
As a pilot & motorcyclist of more than 40 years, my hearing at high frequencies is limited; so I did not see a significant difference between the 2 DSP boards. If I had been in my 20s or 30s, I probably would have noticed the change.
When I went to work at that age, I would hear the TV monitors 15 kHz singing until a bit into my shift when I became accustomed to the sound.
 
I would recommend contacting Elecraft service to determine if the upgrade is worth the cost.
 
73 George AI4VZ
 
 

I think the enhancements were audio related. If you have no complaints, it may not be worth it.
 
From what I remember, comments have been a mixed bag.
 
73
Mike R

I have an older K3, s/n 1312 (10/2008), and I'm thinking about purchasing the K3DSPUPGD, trying to find out if it's worth it or not. wondering if I will notice a change in the receiver performance or audio. Having a hard time finding reviews on that enhancement. Your input is appreciated.




Displaying second receiver RTTY text during split operation

Jim Pyle
 

I recently purchased a keyboard to plug into my P3 and used it for RTTY, displaying text on the second monitor. When the station I was copying went to split operation, I wonder if it is possible to display text from both receivers simultaneously.  Has anyone done this and if so how.


Jim, AA8OY


Re: [Elecraft_K3] Re: k3dspupgrd

David Kowalewski <djkowalewski@...>
 

Hi Bruce,
 Thanks for the reply, I seen one review of this mod from the Nabble site, they said the audio quality was deeper and warmer sounding, wonder if you experienced the same, noise levels here are on the low side, I operate CW, no contesting, I do like a good sounding audio, I heard a Drake receiver one time and that was like music to your ears! I just hate to spend the $ on something if it really doesn’t have much benefit. So I guess I’m still on the fence.

 73’s
WA2OXZ
Dave

 

On Aug 16, 2016, at 1:43 PM, brucemacb@... [Elecraft_K3] wrote:

Good afternoon Harley


I have both an older K3 (serial number 670) and a new K3S so I've had the chance to compare both in an Urban environment and a Countryside one. The only mods I've done on the K3 is upgrade of the main DSP board.

In my Urban environment, I honestly did not notice any difference between the RX performance of either radio. I have high electrical noise levels and on 80M that runs at about S8. 

In my Countryside environment then I did notice a significant difference.
The 80M noise level is S2 (as a comparison) and the K3S was significantly better at resolving weak signals (I'm a QRP operator so this is important to me) The K3S also sounded 'cleaner' when listening on headphones.

In both cases I operated CW, SSB and DATA contests.

I know that's a bit of a rough and ready comparison, but my one line summary would be: 
  • Low background noise environment -- upgrade. 
  • High background noise environment, save your money.
73 Bruce G4ABX



RX observation

barry NF1O
 

During the WAE contest this past weekend (Which I was not participating in) I got an opportunity to really hear how good the K3 is (with new synths)
I happened upon a Big gun from nearby that was about 30 over 9 and another station about 350 Hz away that was about S7. I was able to copy either perfectly with only some key clicks from the big gun.
Just to see, I swapped the antenna to my backup radio, a Yaesu FT847 and could copy Big gun ok but the station 350 Hz away was completely wiped.
This is why I am an Elecraft fan.
I have a 400Hz roofer and was at about 150 with the DSP.
73
Barry
NF1O


Re: k3dspupgrd

g4abx
 

Good afternoon Harley

I have both an older K3 (serial number 670) and a new K3S so I've had the chance to compare both in an Urban environment and a Countryside one. The only mods I've done on the K3 is upgrade of the main DSP board.

In my Urban environment, I honestly did not notice any difference between the RX performance of either radio. I have high electrical noise levels and on 80M that runs at about S8. 

In my Countryside environment then I did notice a significant difference.
The 80M noise level is S2 (as a comparison) and the K3S was significantly better at resolving weak signals (I'm a QRP operator so this is important to me) The K3S also sounded 'cleaner' when listening on headphones.

In both cases I operated CW, SSB and DATA contests.

I know that's a bit of a rough and ready comparison, but my one line summary would be: 
  • Low background noise environment -- upgrade. 
  • High background noise environment, save your money.
73 Bruce G4ABX


Re: [Elecraft_K3] k3dspupgrd

George Danner
 

I did the upgrade by swapping out boards.
 
My recall = The major change was the addition of a low pass filter to eliminate a “leak through” of the D to A clock.
At the time, there were complaints by several users that there was a high frequency noise in the K3 that was tiring when using the K3 for long periods.
Also improved the low freq response of the audio – don’t remember the complaint.
 
As a pilot & motorcyclist of more than 40 years, my hearing at high frequencies is limited; so I did not see a significant difference between the 2 DSP boards. If I had been in my 20s or 30s, I probably would have noticed the change.
When I went to work at that age, I would hear the TV monitors 15 kHz singing until a bit into my shift when I became accustomed to the sound.
 
I would recommend contacting Elecraft service to determine if the upgrade is worth the cost.
 
73 George AI4VZ
 
 

I think the enhancements were audio related. If you have no complaints, it may not be worth it.
 
From what I remember, comments have been a mixed bag.
 
73
Mike R

I have an older K3, s/n 1312 (10/2008), and I'm thinking about purchasing the K3DSPUPGD, trying to find out if it's worth it or not. wondering if I will notice a change in the receiver performance or audio. Having a hard time finding reviews on that enhancement. Your input is appreciated.


Re: [Elecraft_K3] k3dspupgrd

mikerodgerske5gbc
 

I think the enhancements were audio related. If you have no complaints, it may not be worth it. 

From what I remember, comments have been a mixed bag. 

73
Mike R

Find me on "Zello", a walkie talkie or handi talkie type app. I'm listed as KE5GBC. I'm mostly on late at night. 

On Aug 15, 2016, at 6:24 PM, "djkowalewski@... [Elecraft_K3]" <Elecraft_K3@...> wrote:

 

I have an older K3, s/n 1312 (10/2008), and I'm thinking about purchasing the K3DSPUPGD, trying to find out if it's worth it or not. wondering if I will notice a change in the receiver performance or audio. Having a hard time finding reviews on that enhancement. Your input is appreciated.


k3dspupgrd

djkowalewski@...
 

I have an older K3, s/n 1312 (10/2008), and I'm thinking about purchasing the K3DSPUPGD, trying to find out if it's worth it or not. wondering if I will notice a change in the receiver performance or audio. Having a hard time finding reviews on that enhancement. Your input is appreciated.


k3dspupgrd

djkowalewski@...
 

I have an older K3, s/n 1312 (10/2008), and I'm thinking about purchasing the K3DSPUPGD, trying to find out if it's worth it or not. wondering if I will notice a change in the receiver performance or audio. Having a hard time finding reviews on that enhancement. Your input is appreciated.

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