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Alignment Issues for Philco 70
#4

Here's where the rubber meets the road. You already know your connection points.
1 Tune the IF cans for maximum sound via the speaker with a off the air signal.
2 Tune the Front end Ant RF adjustment around 1600 for maximun sound at the speaker with an off the air signal.
3 Go back and put a meter on the speaker, if you wish, and tune your signal generator to 260 kc and using the minimum acceptable signal, touch up the IF cans. At this point your not concerned about what frequency the dial shows on the generator, You know the radio's right. The IF cans dont change the radios recieve frequency. When we adjust their "resonance" we are just allowing them to pass through the desired passband at the maximum amplitude possible to the next stage.
4 Tune for max on the Ant RF adjustment as well.
5 Use the Signal generator to set the oscilator tuning and osc trimmer at the radio (1600 and 600 kc). Use the generator to find what the radio is set for, not the other way around. When finished use off the air station signals to correctly calibrate the osc adjustment and trimmer.
6 Touch up the Ant RF again at the high end of the dial.
7 Do this for each additional band for the radio, but leave the IF's alone after this first run through.

Remember to always use the minimum acceptable signal from the generator (not the radio's volume control) as too much will overload the front end of the radio and make finding that sweet spot a lot harder to discern during your alignment.

Now, sit back and enjoy your radio.

Dave Casazza
Keep em glowin and goin...


Messages In This Thread
Alignment Issues for Philco 70 - by Guest - 12-06-2008, 09:34 PM
Re: Alignment Issues for Philco 70 - by etech - 12-06-2008, 10:23 PM
Re: Alignment Issues for Philco 70 - by DCASAZZA - 12-07-2008, 06:14 AM



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