KPA100 and Audio Issue

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KPA100 and Audio Issue

Rich-4
I am having an issue with distorted audio once the KPA100 kicks in at
about 10-12v.

The KPA100 is putting out 100 watts

I have re-calibrated the radio with no change.

I am testing with the hand mic and a dummy load.   Which should
eliminate any external devices causing it

Any suggestions as to what can be causing this issue?

Thanks

Rich

K3RWN

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Re: KPA100 and Audio Issue

Don Wilhelm
Rich,

Connect an external wattmeter and a dummy load.
Then set the K2 power to 50 watts and do a TUNE.
What is the actual power output?  If it is much greater than 100 watts
(as I suspect), then you do not have power control and that says that
the wattmeter in the KPA100 has been damaged - likely from static coming
in on the feedline.
Replace D16 and D17 in the KPA100 and the problem should go away.

73,
Don W3FPR

On 4/6/2020 11:36 AM, Rich wrote:

> I am having an issue with distorted audio once the KPA100 kicks in at
> about 10-12v.
>
> The KPA100 is putting out 100 watts
>
> I have re-calibrated the radio with no change.
>
> I am testing with the hand mic and a dummy load.   Which should
> eliminate any external devices causing it
>
> Any suggestions as to what can be causing this issue?
>
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Re: KPA100 and Audio Issue

Rich-4
Just to make sure that was a typo you said K2??

I did your test on my K3S and I am getting about 55 watts on the meter

Any other ideas?

Thank you so much

Rich

On 4/6/2020 13:01 PM, Don Wilhelm wrote:

> Rich,
>
> Connect an external wattmeter and a dummy load.
> Then set the K2 power to 50 watts and do a TUNE.
> What is the actual power output?  If it is much greater than 100 watts
> (as I suspect), then you do not have power control and that says that
> the wattmeter in the KPA100 has been damaged - likely from static
> coming in on the feedline.
> Replace D16 and D17 in the KPA100 and the problem should go away.
>
> 73,
> Don W3FPR
>
> On 4/6/2020 11:36 AM, Rich wrote:
>> I am having an issue with distorted audio once the KPA100 kicks in at
>> about 10-12v.
>>
>> The KPA100 is putting out 100 watts
>>
>> I have re-calibrated the radio with no change.
>>
>> I am testing with the hand mic and a dummy load.   Which should
>> eliminate any external devices causing it
>>
>> Any suggestions as to what can be causing this issue?
>>
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Re: KPA100 and Audio Issue

Bob McGraw - K4TAX
In reply to this post by Rich-4
I’d say that 10 - 12 volts is too low. The supply should be 13.8 to 14.8.  

Bob, K4TAX


Sent from my iPhone

> On Apr 6, 2020, at 10:52 AM, Rich <[hidden email]> wrote:
>
> I am having an issue with distorted audio once the KPA100 kicks in at about 10-12v.
>
> The KPA100 is putting out 100 watts
>
> I have re-calibrated the radio with no change.
>
> I am testing with the hand mic and a dummy load.   Which should eliminate any external devices causing it
>
> Any suggestions as to what can be causing this issue?
>
> Thanks
>
> Rich
>
> K3RWN
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]


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Re: KPA100 and Audio Issue

Don Wilhelm
In reply to this post by Rich-4
Rich,

Well, since the KPA100 is an option for the K2 (and not for any other
transceiver), I did not make a typo.
Since you have the K3S, the 100 watt amplifier is the KPA3.
That is why one has to be careful when specifying designations of options.

As I recall, that distorted audio on the K3S is a symptom of a failure
in the LPA on the RF Board.  Contact [hidden email] to get some
points to check.

73,
Don W3FPR

On 4/6/2020 1:43 PM, Rich wrote:
> Just to make sure that was a typo you said K2??
>
> I did your test on my K3S and I am getting about 55 watts on the meter
>
> Any other ideas?
>
> Thank you so much
>


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Re: KPA100 and Audio Issue

Rich-4
Thanks for your help as always.   Well frankly I have been calling it
the wrong thing forever.

Rich

On 4/6/2020 14:09 PM, Don Wilhelm wrote:

> Rich,
>
> Well, since the KPA100 is an option for the K2 (and not for any other
> transceiver), I did not make a typo.
> Since you have the K3S, the 100 watt amplifier is the KPA3.
> That is why one has to be careful when specifying designations of
> options.
>
> As I recall, that distorted audio on the K3S is a symptom of a failure
> in the LPA on the RF Board.  Contact [hidden email] to get some
> points to check.
>
> 73,
> Don W3FPR
>
> On 4/6/2020 1:43 PM, Rich wrote:
>> Just to make sure that was a typo you said K2??
>>
>> I did your test on my K3S and I am getting about 55 watts on the meter
>>
>> Any other ideas?
>>
>> Thank you so much
>>
>
>
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Re: KPA100 and Audio Issue

Bob McGraw - K4TAX
In reply to this post by Don Wilhelm
From my experience Don is correct that a failure of the KPA3A will cause distortion.  Mine failed twice and was replaced by Elecraft.

The best description of the failure is “fuzzy audio”.   I don’t recall the output was showing less than 100 watts.


Bob, K4TAX


Sent from my iPhone

> On Apr 6, 2020, at 1:25 PM, Don Wilhelm <[hidden email]> wrote:
>
> Rich,
>
> Well, since the KPA100 is an option for the K2 (and not for any other transceiver), I did not make a typo.
> Since you have the K3S, the 100 watt amplifier is the KPA3.
> That is why one has to be careful when specifying designations of options.
>
> As I recall, that distorted audio on the K3S is a symptom of a failure in the LPA on the RF Board.  Contact [hidden email] to get some points to check.
>
> 73,
> Don W3FPR
>
>> On 4/6/2020 1:43 PM, Rich wrote:
>> Just to make sure that was a typo you said K2??
>>
>> I did your test on my K3S and I am getting about 55 watts on the meter
>>
>> Any other ideas?
>>
>> Thank you so much
>>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]


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Re: KPA100 and Audio Issue

Ed Pflueger
In reply to this post by Don Wilhelm
That's where the problem was in my 2 K3S's.

Ed.. AB4IQ

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Don Wilhelm
Sent: Monday, April 6, 2020 1:09 PM
To: Rich <[hidden email]>; Elecraft <[hidden email]>
Subject: Re: [Elecraft] KPA100 and Audio Issue

Rich,

Well, since the KPA100 is an option for the K2 (and not for any other transceiver), I did not make a typo.
Since you have the K3S, the 100 watt amplifier is the KPA3.
That is why one has to be careful when specifying designations of options.

As I recall, that distorted audio on the K3S is a symptom of a failure in the LPA on the RF Board.  Contact [hidden email] to get some points to check.

73,
Don W3FPR

On 4/6/2020 1:43 PM, Rich wrote:
> Just to make sure that was a typo you said K2??
>
> I did your test on my K3S and I am getting about 55 watts on the meter
>
> Any other ideas?
>
> Thank you so much
>


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Re: KPA100 and Audio Issue

Adrian-3
In reply to this post by Bob McGraw - K4TAX
I always use 15.6v and with double heavy cable to minimise VD,


On 7/4/20 4:08 am, Bob McGraw K4TAX wrote:

> I’d say that 10 - 12 volts is too low. The supply should be 13.8 to 14.8.
>
> Bob, K4TAX
>
>
> Sent from my iPhone
>
>> On Apr 6, 2020, at 10:52 AM, Rich <[hidden email]> wrote:
>>
>> I am having an issue with distorted audio once the KPA100 kicks in at about 10-12v.
>>
>> The KPA100 is putting out 100 watts
>>
>> I have re-calibrated the radio with no change.
>>
>> I am testing with the hand mic and a dummy load.   Which should eliminate any external devices causing it
>>
>> Any suggestions as to what can be causing this issue?
>>
>> Thanks
>>
>> Rich
>>
>> K3RWN
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
>
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Re: KPA100 and Audio Issue

Bill Steffey NY9H
Rich really meant WATTs.....

On 4/6/2020 5:54 PM, Adrian wrote:

> I always use 15.6v and with double heavy cable to minimise VD,
>
>
> On 7/4/20 4:08 am, Bob McGraw K4TAX wrote:
>> I’d say that 10 - 12 volts is too low. The supply should be 13.8 to
>> 14.8.
>>
>> Bob, K4TAX
>>
>>
>> Sent from my iPhone
>>
>>> On Apr 6, 2020, at 10:52 AM, Rich <[hidden email]> wrote:
>>>
>>> I am having an issue with distorted audio once the KPA100 kicks in
>>> at about 10-12v.
>>>
>>> The KPA100 is putting out 100 watts
>>>
>>> I have re-calibrated the radio with no change.
>>>
>>> I am testing with the hand mic and a dummy load.   Which should
>>> eliminate any external devices causing it
>>>
>>> Any suggestions as to what can be causing this issue?
>>>
>>> Thanks
>>>
>>> Rich
>>>
>>> K3RWN
>>>
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to [hidden email]
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>> Post: mailto:[hidden email]
>>
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>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
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