[Boatanchors] BC-375 Xmtr. questions

[Al Klase]

StephenTetorka at cs.com wrote:

>Hi all:
>
>Would appreciate your kind help on these questions:
>
>1.  What antenna load (range) did it like?
>  
>
This transmitter should be able to load anything, including the 
proverbial wet noodle.  (This is all based on my read of the BC-191 
manual.  That's the 12-volt version of the 375.)  There were basically 
two antennas in a typical aircraft installation:  a short wire running 
back to the tail and a trailing wire that was used while airborne.  The 
key to all this is the "Antenna Circuit Switch"  labeled "N".  In 
position "2" it will be happy with a quarter-wave wire, and should 
handle a normal coax feed just fine.

>2.  I understand that a single wire 'transmission line' was used...correct?
>2a..if "yes"...was there a "ground"..and if so...how/where?
>  
>
The "transmission line" is more of a  short jumper to get through the 
antenna relay and outside the plane.  For your purposes the ground 
connection is labeled "CPSE" i.e., counterpoise.  From the schematic, it 
looks like it floats.  I'd jumper "CPSE" and "GND" , and connect my coax 
between."ANT" and "GND."

>3.  That single wire "transmission line" had to radiate?...what precautions 
>were necessary when routing the wire to the antenna?
>  
>
Probably too short to do much radiating (less than lambda/100), but 
you'd want to watch out for RF burns, especially when using a short antenna.

Regards,
Al

Al Klase - N3FRQ
Flemington, NJ
http://www.skywaves.ar88.net/