[AMRadio] BTA Mods

Jim Wilhite w5jo at brightok.net
Mon May 29 10:47:11 EDT 2006

That is interesting about the relays Rick.  Are you sure they are DC coils? 
I have a P&B LK 17A relay here that NIB.  It is the same setup but has 115 V 
coils.  They are marked AC but I wonder if the BTA ran them off of DC?

73  Jim

> Steve,
> That could very well be true.  When I receive the schematic I'll know more 
> about exactly what the work is all about.  There are very few differences 
> between the BTA models circuit wise, but it seems the oscillator is one of 
> them.  The BTA-1R1 uses 4PDT  AC relays to switch the crystal frequency 
> and the R2 I have uses DPDT reversing latch relays with DC coils.  I'm not 
> sure exactly what else is different, but I have found some of the edge 
> connections to be different.
> Thanks for the insight.
> 73,
> Rick/K5IZ

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