Center the antenna on the vehicle, then check the SWR on channel 1 and channel 40.
with the switch in CAL position, key radio and use the swr/cal knob to
set the meter so the needle is just touching the end of the red area on
the right-hand side of the meter.
Once calibrated, unkey and switch
the switch to SWR and key up again. The lower the reading, the better. If the SWR is Higher on 40,
the antenna needs to be shorter.. if its higher on 1, then the antenna
needs to be longer.
if it dont transmit period on AM, then there's an internal glitch :)
148 gtls have a very touchy receive they are naturally a quiet radio on am. It could be noone in the area is that close to hear.
I'm not sure what kind of antenna you have, but a 36" magnet mount is not much. I would suggest using a better quality antenna like a Wilson 1000 or something like that. cheap 36" antennas are not a very good investment.
Thanks,
Dodgem250.com
Magnet mounts do not have a true ground.....try grounding chasis of radio to circuit board ground
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