[Kenwood] TS-940S Not Receiving on CW

[Dennis Younker NE6I]

Thanks Paul. I'm curious about that experience. In my case, CW receive is 
not functioning in neither wide or narrow mode. The service manual says wide 
mode uses the 6 kHz wide ceramic filter (AM mode) and the SSB filter (mine 
is the stock 2.7 kHz wide filter). Since my RX is functioning in both SSB 
and AM, it would seem that a solder bridge is not my problem. At least 
that's my reasoning. Thoughts?

CW receive was functional for several years and only stopped working 
recently.

And Bill, having read the service manual again and learning the CW path 
through the filters, it seems to rule out a cold solder joint, at least in 
wide mode. For good measure, I removed the narrow CW filter and reconnected 
the bypass jumper. No joy though.

----- Original Message ----- 
From: "Paul Erickson" <va7nt at telus.net>
To: <kenwood at mailman.qth.net>
Sent: Tuesday, October 25, 2011 5:56 PM
Subject: Re: [Kenwood] TS-940S Not Receiving on CW


> Dennis,
>
> One other possibility is a solder bridge shorting out the filter
> connections. I encountered this
> on one of my 940's a few years ago. Since the 940's are usually not
> shipped with CW filters
> this could be missed in the original testing.
>
> cheers, Paul - VA7NT
>
> On 10/25/2011 05:38 PM, Dennis Younker NE6I wrote:
>> Hi Bill,
>>
>> Actually Ed is helping me out a little. It's me with the TS-940S problem.
>> I'm going to check on the filter more closely in a day or two. Thanks for
>> the suggestion on the cold solder joint. I did wiggle it around earlier 
>> but
>> maybe it's worse than even that would reveal. I'll check it out more
>> closely.
>>
>> --Dennis NE6I
>>
>> ----- Original Message -----
>> From: "Bill Cromwell"<wrcromwell at gmail.com>
>> To:<kenwood at mailman.qth.net>
>> Sent: Tuesday, October 25, 2011 11:31 AM
>> Subject: Re: [Kenwood] TS-940S Not Receiving on CW
>>
>>
>>>> Message: 1
>>>> Date: Mon, 24 Oct 2011 18:07:11 -0700
>>>> From: "Dennis Younker NE6I"<ne6i at cox.net>
>>>> Subject: Re: [Kenwood] TS-940S Not Receiving on CW
>>>> To:<ma.locksmith at juno.com>
>>>> Cc: kenwood at mailman.qth.net
>>>> Message-ID:<F4A2FF2BC01340DEB9FFF3D05EAEE8D3 at dennishome>
>>>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>>>> reply-type=original
>>>>
>>>> Works fine in AM mode. I can copy AM stations fine, and tuning into a 
>>>> CW
>>>> signal, I can hear a carrier coming and going (without the BFO of
>>>> course).
>>>> In CW mode however, the receiver goes quiet (no audio) but the S-meter
>>>> indicates that the unit is receiving the signal.
>>>>
>>>> ----- Original Message -----
>>>> From:<ma.locksmith at juno.com>
>>>> To:<ne6i at cox.net>
>>>> Sent: Monday, October 24, 2011 11:33 AM
>>>> Subject: Re: [Kenwood] TS-940S Not Receiving on CW
>>>>
>>>>
>>>>> What do you get if you listen on AM mode to a CW signal?
>>>>>
>>>>> Ed
>>>>> K1ZOK
>>>>>
>>> Hi Ed,
>>>
>>> I have a different Kenwood model than yours. When I had a similar
>>> problem I tracked it down to a cold solder joint on one of the crystal
>>> filter pins (CW just as yours). On mine I am able to select the filters
>>> completely independent of the mode selected and it was a sure bet on the
>>> filter (and it's connections). I am not familiar with the block diagram
>>> of your radio to know if it is possible for that to affect yours in a
>>> similar way. If your rig were mine that is the first place I would look.
>>> Costs nothing but a little bit of time.
>>>
>>> 73,
>>>
>>> Bill  KU8H
>>>
>>>
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>
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