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37-9
Mondial
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Posts: 1,114
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City: Irvington, NY
#2

04-08-2022, 11:29 PM
How accurately are you setting the function generator to exactly 470 kHz to align the IF? Do you have a frequency counter to accurately check the frequency? If the generator is slightly low in freq, the trimmer may not have enough adjustment range.

Without a frequency counter you can confirm frequency accuracy by listening for the second harmonic of your generator ( 940 kHz ) or third harmonic ( 1410 kHz) on an accurate digital AM radio. Setting the function generator to triangle will produce higher harmonic content for a stronger received signal.
(This post was last modified: 04-09-2022, 12:02 AM by Mondial.)
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Messages In This Thread
37-9 - by tomg - 04-08-2022, 06:56 PM
RE: 37-9 - by Mondial - 04-08-2022, 11:29 PM
RE: 37-9 - by tomg - 04-09-2022, 02:05 PM
RE: 37-9 - by mikethedruid - 04-09-2022, 03:43 PM
RE: 37-9 - by Mondial - 04-09-2022, 05:59 PM
RE: 37-9 - by tomg - 04-09-2022, 10:38 PM



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  1. The PHILCO Phorum
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  3. Philco Electronic Restoration