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Re: [TenTec] Titan 425 Initial Tune-Up settings - high VSWR

To: tentec@contesting.com
Subject: Re: [TenTec] Titan 425 Initial Tune-Up settings - high VSWR
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Reply-to: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 26 Nov 2010 12:18:06 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
That's the way I see it. Taking out C 18, 300 pf fixed requires adding 
that back with the variable loading capacitor. The cap labels are to the 
left of the part. And with the variable having only 500 pf, adding in 
300pf requires turning it about .6 x 180 or 108 degrees. If the input 
SWR changes it hints at a bad switch contact or a PC board problem on 
the input filter board that connects the two switch contacts.

73, Jerry, K0CQ

On 11/26/2010 12:03 PM, CSM(r) Gary Huber wrote:
> I'm probably missing something but it appears to me the only difference
> between the 75 and the 80 meter switched components is at bandswitch S1B
> where C19 (150 mF ) is switched out in the 75m position.  Due to the jumpers
> between 80 and 75 positions in S1A and S1C (Figure 5-1)  values of
> capacitance and inductance would not be changed in those sections between 80
> and 75 nor would those of the low pass filter board. Or am I not reading the
> band switch correctly? If not please explain my error in logic.
>
>
> 73 es DX,
>
> Gary - AB9M
>
>
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