[R-390] Baker and Williams

[Roy Morgan]

At 07:44 AM 11/22/2004, Charles B wrote:
>Hi all,
>
>Someone told me that they obtained a SSB outboard unit for the R390A from 
>Baker And Williams.  I went to B&W's web page and couldn't find anything 
>there concerning this?  The fella who mentioned the unit has a problem 
>answering email, so I was wondering if anyone out there on this reflector 
>has any information about this unit?

Chuck,

The B&W unit is the "Model 370 Single Sideband Receiving Adapter:"  It 
operates on the frequency conversion principle, with its low IF frequency 
at 17 to 20 Kc.  Upper or lower sideband is selected by changing the mixing 
frequency.  A filter at 17 Kc selects the desired band of 
frequencies.  There is a 17 Kc injection oscillator to re-inject the BFO 
signal for SSB, CW, or enhanced am operation.  The thing contains an audio 
amplifier (6V6) and speaker.

These units seem quite hard to find. I have one, one other fellow I know of 
has one also.  I also have an original manual, and will be happy to provide 
copies of it to anyone who needs one (it is not on the BAMA site - When I 
get the time, I'll scan it and send it in for all to have.)

Other sideband adapters that can be used with the R-390A or other radios 
with 455 kc IF frequencies include:

Hammarlund HC-10: quite rare and expensive
Hammarlund SPC-110 rack mount equivalent: even more rare and expensive
Military CV-591 (aka MSR-4) made by TMC sideband adapter
Any modern rice box that will receive SSB and tune to 455 Kc.

Roy


- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Cell 301-928-7794
Work: Voice: 301-975-3254,  Fax: 301-948-6213
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