[TenTec] Two Century 21 problems

[Tom NØJMY]

I'm sorry, Mike.  I did a lousy job of explaining this problem.  It 
would have been easier if I had just said "the threaded holes in the 
knobs are stripped".  This is where the problem lies.

The screws turn in as they should, but then continue to turn after they 
make contact with the shaft.

I am going to try Mike's suggestion of running a thin wire inside the 
hole in a few minutes.

Thanks for the reply, though.

73,
Tom

Mike Hyder -N4NT- wrote:
> If the screws are going in so far that they fall out the inside of the 
> knob, it sounds like a sleeve is missing or something like that.  
> Compare the diameter of the rod onto which they mount with the diameter 
> of the hole in the knob.
> 
> Specifically, the set-screws in the main tuning knob are indeed tiny in 
> diameter.  I don't know their length.
> 
> Mike N4NT
> 
> ----- Original Message ----- From: "Tom NØJMY" <n0jmy at hayseedhamfest.com>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Friday, June 12, 2009 12:32 PM
> Subject: [TenTec] Two Century 21 problems
> 
> 
>> I'm going back together with the first of four Century 21's here.  First
>> off, is it me, or are the set screws in the main tuning knobs really
>> tiny?  Such that the threads in the knob are excruciatingly fragile?  I
>> haven't got one out of the four that will tighten enough to stay secured
>> to the PTO shaft.  A couple of the screws can be pushed right through.
>> Any thoughts on a simple fix for my simple mind?
>>
>> Second, and more serious.  I had one up and running yesterday on 20
>> meters.  Seemed to have good sensitivity, maybe even above average.  So
>> I plugged in the matching calibrator which put in a deafening
>> signal...for awhile.  As I tuned to zero-beat the audio quit completely.
>>
>> After monkeying around with it for about twenty minutes without plan, I
>> switched the selectivity control from narrow to the middle position and
>> pop, the audio came back.  On all three bandwidths.
>>
>> So I turned the RF and AF controls way down, turned the calibrator back
>> on and started increasing the gain.  Like an idiot, I can't remember
>> which one, maybe both - arrgh!  The calibrator had plenty of signal all
>> the way to the top of ten meters.
>>
>> But as I continued to increase gain, poof.  No audio again.  It wasn't
>> near maximum gain either.  And this time it hasn't come back.
>>
>> What would cause this behavior?  And any ideas where I should start my
>> trouble-shooting?  Being primarily a boat-anchor man, I can use all the
>> help I can get.
>>
>> Thanks,
>> Tom
>>
>> _______________________________________________
>> TenTec mailing list
>> TenTec at contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec 
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