Tuning / Testing Guide

by Jay Banks


  1. General Setup and IFR Information.

  2. IFR Modes

  3. Checking A Radio
         Checking The Receive Side

  4. Program a Tone Sequence


  1. General Setup and IFR Information. for an IFR FM/AM–1200S

Picture of IFR FM/AM–1200S 


A. "2nd Function" button lets you use blue functions over keypads
B. "2nd Function" + "meter" button will turn on the digital meter

a. M.D. stands for maximum deviation
b. F.E. stands for Frequency Error.

C. "Meter" knob shares function between modulation and power

D. "Frequency Error" knob, when set to 1k, means there is one k
     between the left of scale and the 0 (center) of the scale, and
     1k between the 0 (center) and the right side of scale.

2.   IFR Modes

A. If you are going to check the radio's receive or transmit:

B. Modulation

C. General Operation

3. Checking a radio.

1. Check radio's Power Out

2. Check the "frequency error"

3. Check Modulation

4. Check the P.L.

You want to get a stable circle on the monitor.


Checking a Radio's Receive Side

There are two type of P.L. Tones:

  • CTCSS (e.g. 179.9)

  • DCS or Digital coded squelch, which is normally a three digit number.

Note: to check a DCS P.L. tone, go to 2nd Function "DCS" button and use the +/- button to change between a "normal" or "inverted" P.L. tone.

Note: make sure the P.L. is turned on.




Program A Tone Sequence

Button Sequence:

"Program" button, "Tone" button, and press "0" (where "0" = tone 0)
"Program" button, "Tone" button, and press "1" (where "1" = tone 1)

To Execute the Tone Sequence:

"Execute", "2nd Function" button, and "Tone Sequence" button


"Program", "2nd Function" button, and "Tone Sequence" button brings up on display:

T0    1.000    0.000
T1    3.000    0.000

T = Tone number / time in seconds / Gap time
(e.g. T0 will be 1 second long with no gap between
it and the next tone).

Also, Leave tone on "Sine"



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