[AReU] Kenwood TH-25AT

[Ken MacNeill]

Bob,

I can bring a Communications Service Monitor to AReU next Tuesday if you 
would like.  It checks power out, frequency, and CTCSS frequency and 
level, so that should tell us for sure whether you have a tone board and 
if it on frequency and the level is adequate.

In the mean time there is an easy check you can make.  If you have a 
pair of pretty good Hi-Fi Stereo headphones (not the junk that comes 
with most CD players, personal radios, etc. ... although every now and 
then you get a decent pair), you can plug them into the '2AT (this is 
assuming Icom uses a one eighth of an inch phone jack for external 
speaker.  I think Kenwood was the only odd-ball on their earlier HTs.). 
  You can't use headphone designed for Amateur Radio use because they 
roll off the low frequencies which are just the ones you want to hear in 
this case.  You will only get audio in the left ear piece but that 
should be good enough for a test.  Set the '2AT to 147.765 and transmit 
on the Kenwood.  Do this in a quiet room so will be sure to hear the 
136.5 tone if it is there.  If you hear a low frequency tone when you 
key the '25AT, it may be off frequency or at the wrong level and the 
decoder in the repeater receiver doesn't recognize it.  That's where the 
service monitor can tell us what's wrong.

You can't hear the 136.5 Hz tone on the tiny '2AT speaker because it 
won't reproduce frequencies that low.  Because it is so small, the laws 
of physics just won't let it go that low.  Besides, for most ham 
activity, you don't want to hear those sounds anyway!

Let us know what you find if you're able to do the test.  See you and 
everyone else on the 3rd.

73,

Ken
WA4HTZ