Westinghouse 475KHZ IF?
 

Here is a Westinghouse h-126 that obviously was running quite hot! On both IF can's someone wrote 475.

I haven't hooked up my signal generator yet to see if it really is 475 or 455KHZ....

Why would have someone change the IF frequency(if that's really whats going on here....)

Thanks!
Matt Davala

Changing the IF frequency will change the radio's bandspread relative to the dial markings (on the Broadcast band). That is, depending on which way you move the IF, the spread will be either too wide or too narrow to match the markings. Maybe this is why somebody changed the IF.

Sometimes the 455 kHz IF is shifted to prevent interference when the radio is tuned to 910 kHz (second harmonic).

jr

455 wasn't a rule so much as a convention....262KHz was common in car Radios and some other AM sets. I can see a maker running a different IF frequency if they could extract some design advantage or parts ecconomy from it.

Some of the early '30s sets used 175 kc. Image rejection wasn't the best. :rolleyes:

According to the service information in the Riders for this radio the IF Frequency for this radio is supposed to be 455 kHz, so 475 kHz is a little high for this radio, which means it might not operate as intended tuning wise.

It might be good to try and tune the IF back to the original 455 KHz that it was intended to run at for best tuning results.