SB 300 / 401 request for help from w0fn

[Dave Edwards]

Bill.....just for yucks, with the power off, use a multimeter to verify that 
the carrier null control
is doing its' thing (changing resistance).. It is a high failure item, and 
might be bad.
.....Dave


----- Original Message ----- 
From: "Paul K. Dean" <heathmod at NTELOS.NET>
To: <HEATH at LISTS.TEMPE.GOV>
Sent: Monday, May 10, 2010 9:44 PM
Subject: SB 300 / 401 request for help from w0fn


> All -
>
> Below is a request for assistance from Bill, w0fn.  He has had some
> difficulty posting his message to the list.  If you can be of assistance
> to Bill with his SB 300 / 401, he can be reached at w0fn at kc.rr.com.
>
> Thanks.
>
>
>> Yes, Paul I am sure it was.  The net control said it was forwarding to
>> you, and I thanked them and they said Your Welcome, but I guess if it was
>> an attatchment, it never got to you.  I tried several times sending it to
>> the net but I am not very computer literate and I guess it never made it.
>> Briefly my problem is an unwanted carrier of about 5 watts with an
>> SB-300/SB-401 combo(tuned to about 90 warrs output) in the locked
>> position, when the ptt is engaged. In the unlocked position the operation
>> is normal and the carrier only a hairline trace on the monitor scope, 
>> with
>> the ptt engaged.  The carrier null and balance controls have no effect on
>> this unwanted carrier, nor does reducing the drive and mike gain control
>> to zero.  Tune up in either the locked or unlocked position on the SB-401
>> is normal. I tried tapping on all of the tubes(except the finals) with a
>> small rubber mallet while holding the ptt engaged (which sometimes has
>> some unusual an unintended consequences, but no reduction in the unwanted
>> carrier.  Paul, if you could put this reply on the net it may contain
>> enough information to be helpful.  Any help would be greatly appreciated.
>> Bill, w0fn
>> ---- "Paul K. Dean" <heathmod at ntelos.net> wrote:
>> Bill -
>>
>> Threre was a message from you a while back that had no content and thus
>> did not distribute.  Might that have been the one?
>>
>>
>>> Paul, Did my request for help on the unwanted carrier problem on the
>>> above
>>> combo ever get listed?  I did not receive a single reply which seems
>>> unusual.  Bill, w0fn
>>>
>>
>>
>>
>>
>>
>
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