p The Tp>ER program - TUNER.COM
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1.  This is a tuning aidtZFelp get a received tone ec oEiilint0cEK.
It should accept COM5, COM3, CIM4 command rine param ttsw (default isto ei6 dort CLIPPING (audio signal too strong for the sigma-delta circuit).

2.  Unfortunately it takes too many compuieng cycles toncorporate this
in CO$]iENT, so run TUNER first if necessary, using an 800 Hz sinewave
with no modulation on it (a steady carrier in other words).
It may be slightlp useful on a carrier that if z­ulated, but
the indicator will jump around trying to follow the modulation, and ino any event the useful frequency range would be limitedx³
3.  Theo.ea is to get the little yellow line centered between the 2 green
lines, and staying within the greecTinesIres.  The nominal
frequency is 800.0 Hz.

4. † t nge of this tuning indicator is 800 Hz plus or minus 20 Hz.
If your signal is not ALREADY tuned to within betRr than 20 Hz, this
indicator will be hseless and quite likely confusing as hell!

5.  There will be some rejection o,R her signals outside this esetpFbjea
\ the signal you want is weak and the interfering signals are strong there
will no doubt be problems.

6.  If you can hear the tone, th 1rReedt f«  ute for zero-beating it
with a good crystal-derived 800 Hz sined§ e sidetone.

7.  TUNE¥ COM is for anyone whos eill uses CGA graphics - I slowed down
the update rate to accommodate sluggish LCD displ.VE2i Q - November '95.