[ARC5] ARC-5 "Linear".....

[Robert Nickels]

On 6/19/2017 5:38 PM, Mark K3MSB wrote:
> Shot these at the Fathers Day fester in Upperco MD......

Very cool!   The transmitter looks to be a homebrew clone of a Central 
Electronic phasing exciter, or maybe a W2EWL rig with some enhancements 
- the  B&W 2Q4 audio phasing network can be seen in the lower-left 
corner, behind the chopped-down command set VFO chassis.   The amp looks 
like a pair of 811As with 816 rectifiers and screen regulation so they 
could run class AB1 with low level drive from the exciter.    A classic 
setup for vintage SSB homebrew, too bad they were stored in such nasty 
conditions, but they'd clean up and put a good signal on the air even 
today. The radio club where I got my license had a homebrew 75 meter 
transceiver that I think was a unique design by the chief engineer from 
a TV station, but what I remember for sure about it was that it had a 
command set tuning capacitor and dial.

Several commercial SSB transmitters including the Lakeshore Phasemasters 
and Gonset GSB-100 used command set components as they were available 
cheaply and provided excellent performance. And of course the BC-458 
conversion was the most common VFO in use back in that era, either in 
it's native trim or inside one of the dress cabinets sold by Central 
Electronics.

73, Bob W9RAN