[TenTec] TT 238C will not tune

[Richards]

Well, this is where I get corn-fused.

The user manual states it is a REVERSIBLE L-NETWORK, whereby the fixed 
capacitors are either placed at the front of the circuit or at the end 
of the circuit using the BYPASS switch.   I presume the current always 
flows in the same direction through the circuit, including the inductor. 
  (Heck, I am still learning to read schematic diagrams.)

 From some of the previous comments, it sounds as if there is some 
uncertainly as to the ZERO (0) inductor setting means the most or the 
least inductance.

Is this not revealed in the schematic?  Or do we have to open the lid 
and look to determine the matter?  And, would it not be the same from 
unit to unit?   Some comments seem to suggest the Zero (0) setting could 
be different on some units.

Sorry if I missed a point along the way.  It is still a mystery to me.

------------------- K8JHR  -----------------------



On 7/28/2013 2:18 PM, Robert Mcgraw wrote:
> If 0 is maximum inductance.....good.  If 0 is minimum inductance.....not
> so good.  Some value of C is correct for determining the HiZ or LoZ
> switch setting initially.
>
> 73
> Bob, K4TAX
>
>
>>
>>
>> On 7/27/2013 7:15 PM, Bob McGraw - K4TAX wrote:
>>     Now if the inductance is maximum value then
>>> it is very apparent where Z should be located, either on the input of L
>>> or the output of L.  I believe it general practice to start with
>>> maximum
>>> inductance for adjustment of any L network.
>>
>> _____________________________________________
>>
>>
>> 	Hmmm...  so it appears the instruction manual
>> 	does not describe the best approach?  I understood
>> 	the user manual to say I should start with zero
>> 	on the Inductor, and the Capacitor at around 2.
>>
>> 	In contrast, based on your description, it appears
>> 	I would be better off starting with the inductor in
>> 	the middle - away from either end - and that starting
>> 	there will make it more obvious what initial capacitor
>> 	setting to select on the BYPASS	switch.  I know that
>> 	is not "maximum" - but it would assure that I started
>> 	working against a substantial inductance, rather
>> 	than zero.
>>
>> Or... have I misunderstood?
>>
>> ---------- Thanks - K8JHR  -----------------------
>>
>>
>>
>>
>>
>> --.
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>
>