[ARC5] BC-946B Question

[Kenneth G. Gordon]

On 17 Nov 2015 at 13:54, Radioroslyn via ARC5 wrote:

> Over the last few years I've picked up a few BC-946B (BC band command set rx)
> but am missing a 1st IF transformer for one of them. A member here sent me a few
> spares but they are the interstage (2nd IF) transformer. I under stand that the
> third IF transformers secondary is designed to match a diode load not the grid
> of an IF amp tube. So the $64 dollar question is will the second IF transformer
> make an OK replacement for the first other than the mounting bracket?? Tnx Terry
> N3GTE 

Terry:

If you look carefully at the schematics in the Navy's ARC-5 manual, you will 
see that although there may be a difference between the 1st and 2nd IF 
transformers, there really isn't enough to make any real difference for our 
uses. As I remember it, the difference is in that one uses a center-tap on the 
IF transformer, while the other doesn't. I believe the connections are there, 
so moving a connection to the correct tap is trivial.

The 3rd IF is, however, different due to the diode load.

Ken W7EKB