right C 18 not C 19..... using the 75 m switch position the LOAD control is
always at 10 or full mesh (not enough total capacitance)... using the 80 m
switch position the Load control is at 2.5 or so.
73 es DX,
Gary - AB9M
-----Original Message-----
From: Dr. Gerald N. Johnson
Sent: Friday, November 26, 2010 12:18 PM
To: tentec@contesting.com
Subject: Re: [TenTec] Titan 425 Initial Tune-Up settings - high VSWR
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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