01-10-2026, 12:33 PM
Hi Dan,
Is Compensating cap # 12 in your radio? I am not completely sure of the purpose of either 12 or 11 as adding capacity would lower the resonant frequency, and in SW Mode, 11 and 12 are essentially parallel. However, when the center section of the oscillator is shorted out, that would raise the resonant frequency as expected. The way that the schematic is drawn, we have to assume that all switches are open in Broadcast Band and closed in Shortwave (Police) band. We certainly can't call Philco Tech support or ask the designing engineer as both are deceased (pausing and saying the Requiem Aeternum for the designer), but you may want to ohm the switch to determine if shorted or open in SW. Has the cap been changed? Do you receive stations at the correct dial settings? If the Police band starts at 1.5 MHz you should receive several AM stations from 1600KHz to 1700KHz in the "Police" band.
Is Compensating cap # 12 in your radio? I am not completely sure of the purpose of either 12 or 11 as adding capacity would lower the resonant frequency, and in SW Mode, 11 and 12 are essentially parallel. However, when the center section of the oscillator is shorted out, that would raise the resonant frequency as expected. The way that the schematic is drawn, we have to assume that all switches are open in Broadcast Band and closed in Shortwave (Police) band. We certainly can't call Philco Tech support or ask the designing engineer as both are deceased (pausing and saying the Requiem Aeternum for the designer), but you may want to ohm the switch to determine if shorted or open in SW. Has the cap been changed? Do you receive stations at the correct dial settings? If the Police band starts at 1.5 MHz you should receive several AM stations from 1600KHz to 1700KHz in the "Police" band.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
"Let us begin to do good"- St. Francis
Best Regards,
MrFixr55
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