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 Post subject: Alignment instructions
PostPosted: Dec Mon 25, 2017 7:34 pm 
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Joined: Sep Sat 06, 2008 6:17 pm
Posts: 1027
Location: Central Pa, 17044
Hi guy's, I am now restoring an Echophone model 12 Radio.
http://www.nostalgiaair.org/pagesbymode ... 004394.pdf
The write up has no Alignment information at all.
This is a three gang variable capacitor, C1, C2, C3.
I would like to pull the mica out to clean. I noticed two of the
screws are turned almost all the way leaving the mica very loose.
I know enough not to go around and tighten up all the loose screws
that is on the tuning capacitor, and IF and RF cans.
The IF frequency is 175KC. Where should the variable capacitor be
when starting the alignment procedure? Fully meshed of fully open?
Any help would be appreciated
Gary


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 Post subject: Re: Alignment instructions
PostPosted: Dec Mon 25, 2017 8:26 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 12873
Location: San Jose, CA USA
For aligning the IF transformers at 175 kHz, the setting of the main tuning cap is not too important (other than being sure that you are not tuned to a strong). If you feed in the 175 kHz via the antenna terminal, a little more signal will get through with plates fully meshed.

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 Post subject: Re: Alignment instructions
PostPosted: Dec Mon 25, 2017 8:58 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 34393
Location: Maryland 20709, USA
Hi Gary,

I strongly suggest that you leave the mica trimmers alone unless obviously damaged.
That mica is very thin and fragile, easily damaged.

Trimmers C1 and C2 are tuned to the station carrier frequency.
These would normally be tuned using a station at the high-freq end of the dial.

C3 is the oscillator trimmer. It sets the dial frequency.
It is likewise set at the high-frequency end of the dial.
It's very easy to set the oscillator on the wrong side of the station in low IF radios.

C4 and C5 are trimmers on the 1st IF transformer, adjusted at 175kc.

- Leigh

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