[ARC5] Differences between RU-16 Through RU-19

[WA5CAB at cs.com]

Which of course raises the question of why in the Command Set versions the 
bias resistor was in the dynamotor in the first place.  But we are probably 
some 20 years beyond having anyone to ask the question of.  It might be 
instructive to know whether the 233 or the 133 plug was quoted at a lower price.

In a message dated 4/14/2011 7:02:49 PM Central Daylight Time, 
kk5f at earthlink.net writes: 
> The AGC bias resistor is located in the receiver, instead of the 
> dynamotor
> unit, for the liaison receiver version of the RU is because in liaison
> receiver service up to two receivers may be operated simultaneously from 
> the
> common dynamotor unit and junction box.  If a common bias resistor had 
> been
> used in the dynamotor negative HV lead in the dynamotor unit, as it is in
> the one-receiver-only RU/GF command set models, the current draw of two
> receivers through it compared to just one would greatly affect the bias 
> voltage
> generated.  Putting the bias resistor in each receiver assures that each 
> has
> only its HV current flow through it.  This maintains the AGC bias voltage
> being generated the same regardless of one or two receivers being powered
> from their common dynamotor unit.

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480