Alignment question

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Alignment question

Post by frank1956 on Thu Oct 16, 2014 7:05 pm

One of these days I will figure out this radio lingo. My question is on the alignment procedure for a Silvertone 3004,

The first step is to have the position of the varlabie (I guess I spelled it right hard to make out on the schematic.tuning dial I assume)

http://www.nostalgiaair.org/PagesByModel/941/M0016941.pdf

(1) Open 455kc
(2) Open (Fully) 1640kc

What is the different between open and fully open confused
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Re: Alignment question

Post by 75X11 on Thu Oct 16, 2014 8:00 pm

Open is when your tuning capacitor's plates are fully unmeshed, like two halves of a deck of cards ready to shuffle. Closed is when they are fully meshed like the intact deck.
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Re: Alignment question

Post by frank1956 on Thu Oct 16, 2014 8:21 pm

75,
I understand that. So open and fully open are one in the same, just different frequency??? That has me a little confused.

Frank
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Re: Alignment question

Post by 75X11 on Thu Oct 16, 2014 8:44 pm

The 455 kc is your internally generated interstage frequency.  I would just have the cap open as that alignment portion as it shouldn't have an effect on that portion. The capacitor position is more critical on the next portions as they each involve adjustment of the trimmers on your variable cap. fully open in that case just means the highest end of your tuning band. Each adjustment is to balance out the response across your tuning range.
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Re: Alignment question

Post by Wildcat445 on Thu Oct 16, 2014 9:27 pm

You are doing fine, Frank. If it was easy, everybody could do it. 75 has you going the right direction. Good luck.

WC

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Re: Alignment question

Post by 75X11 on Thu Oct 16, 2014 9:37 pm

Thankya, thankya verymuch.
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