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Post by hottip on Jul 16, 2023 15:11:07 GMT 12
I have a radio that was originally TRF that someone has modified to superhet. It has 'Q' IF's aluminium about 6 cm tall 2cm square. Top and bottom slugs and has '262' on the side.
Question is, is that the IF frequency, or just a type number?
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Post by Richard on Jul 17, 2023 8:42:06 GMT 12
Most likely is 262 Khz, apparently that IF freq was used as in car radios?
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Steve
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vintageradio.co.nz
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Post by Steve on Jul 17, 2023 10:28:36 GMT 12
Thats a great question - do you have a sig gen and scope to see where they are set and where they peak? Inductance Specialists did make 262kc/s IF's - for automotive use I think. The more confusing part is 262 does follow the part numbering that they used for their IF's as well (any coil code ending in a 2 is an IF) - so it could be either. I don't have a listing for a coil coded '262', but I do have some codes (222 and 232) for automotive use IF's at 262kc/s. Here is some info I've assembled on Inductance Specialists 'Q' branded gear: Inductance Specialists generally seems to use a numbering system that helps narrow things down: Numbers ending in: 0 should be aerial coils of some sort 1 are oscillator coils 2 are IF coils 3 are chokes (RF/HF?) 4 are coil assemblies and built-up tuning units 5 are RF coils 6  7 are chassis' Letters at the start: D are dial movements SC are the dial scales P are miscellaneous mechanical electrical components B are basic kitsets Cheers, Steve |
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Post by hottip on Jul 18, 2023 11:17:39 GMT 12
Thanks for the 'Q' info Steve. I don't have a 'scope', but wound the IF slugs right out, then with the sig gen at 262 KHZ into the previous valve, wound them in a bit at a time on the 2nd IF 'til got a peak at 262,and some instability/squealing. Did the same on the first IF. More instability.
Then continued winding them in with sig gen at 455 KHZ 'til peaked again. Peak at 455 was much narrower and stronger and radio was working more or less normally.
So I guess, '262' is Type number only.
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Post by Peter Walsham on Jul 20, 2023 12:46:55 GMT 12
I am able to confirm that the '262' coil is a 455kHz IF transformer. The '262' is the 'Q Inductances' part number (Reference: The TEE VEE RADIO Ltd 1962/1963 parts catalogue)
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Steve
Society Members
vintageradio.co.nz
Posts: 732
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Post by Steve on Jul 20, 2023 15:56:14 GMT 12
Good to hear it's confirmed and sorted  |
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