Re: [TenTec] 242 VFO Problem...

[Ken Brown <ken.d.brown@hawaiiantel.net>]

Hi Lou,

I don't have the information you need. Seems strange that you have "the 
instructions" and do not have the transistor part numbers.
I have had a similar situation with my Hercules II amplifier. The bias 
regulation transistors are shown on the bias control board schematic, 
however they are not mounted on that board. They are mounted on the 
chassis. Since they are not soldered to or mounted on the PCB, they are 
not included in the parts list for that schematic page. That is fair 
enough, except they are also not included in any parts list for the 
chassis either.
I only found replacements by cross referencing the numbers on the 
transistors.
Good luck!

73 DE N6KB

Louis Ciotti wrote:
> All,
>
> So I took the cover off and was probing around checking connections.  
>
> I took the following data on voltages on the controller board at each
> transistor per the instructions.  Mode 3 in the VFO position.
>
> Transistor     |   Collector   |     Base      |     Emitter   |
>                |   T   |   R   |   T   |   R   |   T   |   R   |
> ===============+=======+=======+=======+=======+=======+=======+
> Q1             |  0.37 | 13.78 |  0.8  |   0   |   0   |   0   |
> Q2             | 13.70 | 0.044 | 0.037 |  0.74 |   0   |   0   |
> Q3             | 13.70 | 13.80 |  13.7 |  13.8 |  .221 |   0   |
> Q4             | 13.71 | 13.80 | 0.037 |  11.7 | 11.08 |   0   |
> Q5             |   0   | 11.09 |   0   |  5.06 |   0   |  4.33 |
> Q6             |   0   | 0.021 |   0   | -.035 |   0   |  3.72 |
> ---------------------------------------------------------------+
>
> It appears as if Some of the Transistors are bad on the Control board.
>
> Anyone have any part numbers for replacements??
>
> Thanks
>
> Lou
> KC2RVD
>
>
> -----Original Message-----
> From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
> On Behalf Of MICHAEL SOUHRADA
> Sent: Wednesday, March 26, 2008 1:40 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] 242 VFO Problem...
>
> Hi Carl and the group.
> I'm the guy that sold the VFO to Lu.
> My brain was not in gear and I thought he was setting up a 544
> and not a 244 digital readout. I was very disappointed to see his
> post yesterday.  
> I had a document sheet from TT "Service Note SN-1-540" that
> I should have sent along; I did last night and hopefully that will
> resolve the problem. There are some jumper modifications on the
> 244 plug needed. It also covers the 240,241 in addition to the 242,
> 244 hook up.
>
> If anyone needs this three page document It's available from me
> in .pdf form. Not the best quality but understandable. Ask and you
> shall receive. 
> Also wonder if there is a corresponding sheet for the 244? I don't
> need it but would like to add to my manual file just in case.
>
> Mike
> Iowa
>   ----- Original Message ----- 
>   From: Sferic@aol.com<mailto:Sferic@aol.com> 
>   To: KC2RVD@arrl.net<mailto:KC2RVD@arrl.net> ;
> tentec@contesting.com<mailto:tentec@contesting.com> 
>   Sent: Wednesday, March 26, 2008 6:49 AM
>   Subject: Re: [TenTec] 242 VFO Problem...
>
>
>   I recall the early Triton IV's needed an internal mod to work with the
> remote 
>   VFO. Ten-Tec should have that information. If not, I could probably dig it
> up 
>   for you.
>    
>   Carl, K4SEV.
>
>
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