From: Garey Barrell 
Subject: Re: [drakelist] B-Line vs. C-Line Transceive Operation


Jim -

The late A and all B line receivers relied on color coded 
crystals in the transmitter and receiver to keep them "on 
frequency" in transceive operation over temperature.  This is the 
letter at the end of the serial number on the A and B units. 
Red, Blue or Green, and sometimes Yellow!

In the C line the two oscillators were patched together with the 
BFO cable, enabling a sort of phase lock between them.

Used with a B receiver, the only advantage of the C transmitter 
is the dual dials rather than the single dial and knob skirt of 
the B.  Everything else is the same.  There are a couple of minor 
circuitry differences, but nothing significant.

If you want to transceive in SSB, you want a B transmitter with 
the same color coded crystal as your receiver.  Not easy to do 
these days!  Also, check the actual paint stripe on the crystal, 
since some were changed back when Drake still offered a  crystal 
exchange.  The alternative is to modify a small Xcelite 
screwdriver to allow you to make the Transceive Align procedure 
adjustment in the R-4B without pulling the top cover!!

73, Garey - K4OAH
Atlanta

Jim DiMauro wrote:

> Hi All:
> 
> I used to own a C-Line that I foolishly sold about four years ago, and I've
> regretted the sale ever since.  I vowed to replace it, and I got my first
> replacement piece at Dayton last Saturday: an R-4B.  Not being intimately
> familiar with the B-Line, I've learned that the B-Line has only the INJ line
> to slave the xmtr and rcvr together for transceive, unlike the C-Line that
> had a BFO line as well.  What are the operational and/or practical
> implications of transceiving without using the BFO line?  What did the BFO
> line bring to the party for everyday operation?
> 
> Also, what are the major differences between the B-Line and C-Line xmtrs,
> other than the BFO line and meter switch?  Is there any reason I would
> choose a C-Line transmitter over a B?
> 
> Thanx & 73,
> Jim
> WA2MER
> 
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