[AMRadio] HRO-5 and HRO-7 Coil Compatability

[ne1s at securespeed.us]

> Does anyone know if the HF Osc section of an HRO-5 coil (specifically coil
> C) could be mounted in a C coil set for an HRO-7?  I have a C coil for my
> HRO-7, however the HF Osc coil form has melted and deformed to the point
> it's useless.  Don't ask how it got melted ;)  I'm not having any luck
> finding a C coil set for the 7, so I'm wondering if I could open up more
> possibilities by getting a C coil for the HRO-5.....  I can't find any
> circuit data on the HRO-5 coils to compare to that of the 7.
>

Hi Brian,

The coils are electrically, and I'm 99% sure physically, identical for the
HRO-5 and HRO-7. Re-alignment will be required due to differences in the
oscillator circuits between the -5 and -7.

I've plugged in coil racks from my -7 into a 1935 HRO Sr. and they work
(but to work well they need realignment).

73,
-Larry/NE1S