[MRCA] BC-659 Terminal Box use.

[mkdorney at aol.com]

Here's a tidbit of news about the terminal boxes used on the BC-659 radio to allow for coaxial cable use.  The terminal boxes don't provide for an antenna match for the whip antenna.  You have to use about 10 feet RG8 coax ( about a half wave length) to allow the Terminal Box TM-218 to be used.  You need this length to get the antenna feed line impedance close enough to 50 Ohms to allow the radio to be tuned.  Using a 50 ohm dummy load also won't work, because their is no matching transformer on the radio itself, only a changeover strap.  Antenna tuning, therefore has to be done after final installation on any vehicle if using a TM-218 terminal box with the BC-659.


Mark
WW2RDO
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