K2: st L How loud?

[McMillan, Terry]

Good Morning everyone,
 
When doing the "Audio Amplifier and Tone Generator Test" how loud should
the side tone be.  Use a pair of Sony portable headphones I can't hear
anything until I'm well into 150+, even at max volume of 200+ it is very
quiet.
 
Do I have a problem somewhere?
 

Terry McMillan
VA6MAC

s/n 5567



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[Ron D'Eau Claire-2]

It's subjective, of course, but something isn't right. I can hear the tone
in the phones (and speaker) at St L 001. I have mine set at 024. It's
downright uncomfortable at much over 100.

Do you have any other phones you can try before assuming the rig has a
problem?

Ron AC7AC

-----Original Message-----

Good Morning everyone,
 
When doing the "Audio Amplifier and Tone Generator Test" how loud should the
side tone be.  Use a pair of Sony portable headphones I can't hear anything
until I'm well into 150+, even at max volume of 200+ it is very quiet.
 
Do I have a problem somewhere?
 

Terry McMillan
VA6MAC

s/n 5567


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[McMillan, Terry]

Thanks for the reply Ron,

I also tried a set of iPod earbuds with the same results.

Terry VA6MAC

-----Original Message-----
From: Ron D'Eau Claire [mailto:[hidden email]]
Sent: Wednesday, March 14, 2007 10:09 AM
To: McMillan, Terry; [hidden email]
Subject: RE: [Elecraft] K2: st L How loud?

It's subjective, of course, but something isn't right. I can hear the
tone in the phones (and speaker) at St L 001. I have mine set at 024.
It's downright uncomfortable at much over 100.

Do you have any other phones you can try before assuming the rig has a
problem?

Ron AC7AC

-----Original Message-----

Good Morning everyone,
 
When doing the "Audio Amplifier and Tone Generator Test" how loud should
the side tone be.  Use a pair of Sony portable headphones I can't hear
anything until I'm well into 150+, even at max volume of 200+ it is very
quiet.
 
Do I have a problem somewhere?
 

Terry McMillan
VA6MAC

s/n 5567



************************************************************************
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may contain confidential or privileged information. If you are not the
person named or have not been authorized by them to access their mail,
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[Ron D'Eau Claire-2]

Since you can change the frequency and can hear something, the places to
look are the AF Amp, U9 and sidetone source Q5/U10B.

I'd start at the AF amplifier and make sure +12 is present at pin 7.

If so, next I'd take a close look at the soldering. Did you miss a pin? Is
there a short? A common place for a short seems to be around the headphone
jack pins on the board.

Next, are electrolytic capacitors C32 and C33 oriented correctly?  If
reversed they could ground the input of U9 or the output of U10B for d-c
through L1.

Do you have 8 VDC at pin 4 of U10? That's required for the sidetone "driver"
to provide the correct levels.

Ron AC7AC


-----Original Message-----


Thanks for the reply Ron,

I also tried a set of iPod earbuds with the same results.

Terry VA6MAC

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[McMillan, Terry]

Thanks Ron, problem solved.


I checked U9 Pin 7 and found 13.35 vdc.

Found no shorts around the headphone jack.

Checked orientation of C32 and C33, OK.

Checked U10 pin 4 and fournd 7.94 vdc.

I reheated all solder joints on chips and jacks.

I think the problem might have been a solder joint on one of the jacks.

Now I can blow my ears off before I get to st L 100.

Thanks again.

Terry VA6Mac
-----Original Message-----
From: Ron D'Eau Claire [mailto:[hidden email]]
Sent: Wednesday, March 14, 2007 2:43 PM
To: McMillan, Terry; [hidden email]
Subject: RE: [Elecraft] K2: st L How loud?

Since you can change the frequency and can hear something, the places to
look are the AF Amp, U9 and sidetone source Q5/U10B.

I'd start at the AF amplifier and make sure +12 is present at pin 7.

If so, next I'd take a close look at the soldering. Did you miss a pin?
Is there a short? A common place for a short seems to be around the
headphone jack pins on the board.

Next, are electrolytic capacitors C32 and C33 oriented correctly?  If
reversed they could ground the input of U9 or the output of U10B for d-c
through L1.

Do you have 8 VDC at pin 4 of U10? That's required for the sidetone
"driver"
to provide the correct levels.

Ron AC7AC


-----Original Message-----


Thanks for the reply Ron,

I also tried a set of iPod earbuds with the same results.

Terry VA6MAC


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[Ron D'Eau Claire-2]

Glad to hear it Terry!

The in-process tests are great. They catch errors while it's still
relatively easy to find them!

Resoldering has fixed a lot of funny issues for many builders. While you
don't want large blobs of solder on the pads, a decent amount that has
obviously flowed onto the lead is FB.

Once you get on the air, maybe we'll hook up on short skip between Calgary
and N.W. Oregon!

73,

Ron AC7AC

-----Original Message-----
From: McMillan, Terry [mailto:[hidden email]]
Sent: Wednesday, March 14, 2007 8:12 PM
To: Ron D'Eau Claire; [hidden email]
Subject: RE: [Elecraft] K2: st L How loud?



Thanks Ron, problem solved.


I checked U9 Pin 7 and found 13.35 vdc.

Found no shorts around the headphone jack.

Checked orientation of C32 and C33, OK.

Checked U10 pin 4 and fournd 7.94 vdc.

I reheated all solder joints on chips and jacks.

I think the problem might have been a solder joint on one of the jacks.

Now I can blow my ears off before I get to st L 100.

Thanks again.

Terry VA6Mac

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