[AMRadio] shunt

Rick Brashear rickbras at airmail.net
Fri May 5 16:01:13 EDT 2006

Maybe it is a little over kill. The transmitter is a BTA-1R2 and is 
capable of only 1100 watts max according to the literature.   Of course, 
that much power could only be used in a dummy load.  You're right, I'm 
sure the supply line breaker would trip before it reached 25 amps, but 
if the meter is only 5 amps it is possible to trash it before the power 
disconnects.  If I'm not mistaken the BC-939 antenna coupler used with 
the BC-610 transmitter uses a 15 amp meter in the antenna output 
circuitry and the BC-610 is capable of only 400 watts carrier.  So, it's 
not too far fetched to think that in the event of a catastropic event or 
a bad mismatch the current would quickly soar to extreme levels.

Most likely I'll use the 5 amp meter since it's what I have and hope 
nothing breaks or comes untiedin the dummy load when I'm testing it.


Mike Dorworth, K4XM wrote:

>I squared R is 31,250 watts.  (25 amp). You are going to get the house
>breaker before the ammeter pegs.  A nice 8 amp would handle 3200 watts and a
>ten is handy for 5000 watts.

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