[BC] "live" feeds

[DHultsman5 at aol.com]

In a message dated 5/2/2008 12:52:52 PM Central Daylight Time,  
dpuopolo at usa.net writes:

With two  pairs you can do some pretty sexy things. You can send stereo from
the  remote. You can simplex a mono feedback/intercom audio channel by using
the  center taps of the four windings connecting to the lines (and using  two
more transformers). Finally, you can simplex an order wire between the  mono
line and ground. THEN you can diode steer the relays. Five things, all  on two
pairs!

-D



*************************************
 
For many years in the early days of "remote control"  Continental  
Electronics manufactured several models of transmitter remote control units.  Many of 
the first 50 kW. transmitter sites that were remote controlled used the  
Continental remote controls.
 
All of the units were based on using two d.c. pairs, + & - polarities  and 
differential d.c. voltage levels.  It was amazing how many control  combinations 
they were able to come up with using voltage differentals and now  using 
steppers as other companies did to change channels.
 
However many companies used the same procedured during that time period to  
get as many functions out of a couple of pairs as possible.
 
Probably many of you younger guys don't realize that non-d remote control  
for AM or FM wasn't authorized until about 1954.  If you had a 250 Watt AM  
station there was a first class licensee at the transmitter whenever it was on  
the air.  Also same applied to FM.
 
 
Dave Hultsman
Continental Electronics



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