^rHelp for Tune Radio^r

The [+] and [-] keys are used to  increment or decrement  the value of
the parameter being  adjusted.  The "Select key"  F2 is used to toggle
the TX power range in a low power radio. 

^rOSCILLATOR WARP TUNING:^r

The  oscillator warp adjustment sets the reference oscillator so that
the transmit and receive frequencies are set correctly for the radio.
Since the  MX1000  series  radios  are  synthesized  radios, this one
adjustment will set all  the receive and transmit  frequencies in the
radio  correctly  once  you set it up correctly on  one frequency. To
perform this adjustment, use the procedure given below.
          

*   Key up the radio by pressing the push-to-talk (PTT)  button on the
radio or by using the PTT switch on the test set. Ensure that you have
the RF  connected terminated  in  a 50  ohm load  and  connected  to a
frequency  counter so  that  you can measure  the  transmit frequency.
Determine the frequency error between  the  desired  channel frequency
and the frequency measured.

*  De-key the radio.

*   Calculate the number  of  steps required  to  bring  the  radio on
frequency using the following formulae:

 - For UHF radios :     number of steps = (freq. error in Hz) / 160
 - For VHF radios :     number of steps = (freq. error in Hz) / 80
 - For Midband radios : number of steps = (freq. error in Hz) / 80

Note:  A  negative frequency  error indicates that  the frequency will
have to  be  increased by  stepping  up  with the [+]  key. A positive
frequency error indicates that the frequency will have to be decreased
by stepping down with the [-] key.

*   Select the "Oscillator Warp" item on the screen by using the UP or
DOWN  arrow key.  The selected  item  will  be  highlighted in inverse
video.

*   Use the [+] or [-] keys to increase  or decrease the value  of the
number shown by the number  of  steps calculated above.  Note that the
number shown is a  hexadecimal number and  the numbers will  go from 0
through F.  As an example, if the original value shown is 44, pressing
the  [+] key will  cause the number  to  scroll  through the following
sequence - 45,46,47,48,49,4A,4B,4C,4D,4E,4F,50,51,52 etc.

If you had calculated  that 13  positive steps were  required, you can
press and release the [+] key 13  times.  Or you can hold the  [+] key
down and the numbers will scroll up in value and once you have reached
the desired value, release the key.

*  Key the radio and check  the  frequency.  Repeat  the  procedure if
necessary.  Ensure that the measured frequency is within the specified
frequency window for that radio model.
                                      







^rRF POWER OUTPUT TUNING:^r

Four different power levels can be adjusted in the MX1000 series radio
-  the low,  medium, high and special power level. Each channel in the
radio can have  one of  the four  power  levels  and  the  power level
assignments are made on the  option screen in  the Channel Information
Assignment Table. Note that the standard low power setting is 1.0 Watt
for UHF and 2.0  Watt for VHF while the standard high power setting is
5.0  Watt for UHF and 6.0  Watt for VHF.  Even  though  these  are the
standard settings, you can set the power levels to any value up to the
maximum setting allowed. 
Note  that  on  H3__________  radio  models  (TX low power module) the
adjustable  power  range  can  be toggled between 0.1  ...  1 Watt and
1 ... 2/2.5 Watt using the "Select Key" F2.
Note  also  that you  can set the different power levels  to  the same
value if you wish to do that.  Use the UP or DOWN arrow  to select the
power setting you wish to adjust - Low, Medium, High or Special Power.
Once you have  selected  the  power  level  you  want  to  adjust (the
selected  power level setting will  be highlighted  in inverse video),
follow the procedure given below.

* Choose a channel with a frequency as close to the center of the band
as possible. Set the radio to that channel.

* Connect the RF BNC connector to an RF power meter.
* Key the radio and measure the RF power.

* De-key the radio and use the [+] or [-] keys to adjust  the power to
the desired power setting.  The [+] key will increase  the power level
setting value if  the measured power  is lower than the  desired value
while the [-] key will decrease the power level value  if the measured
power is higher than the desired value.
* Re-key the radio and measure the output power.

* Repeat the  procedure until the power level is at the desired level.

* Check power output  at  the band  edges  (by  going  to  the channel
closest  to  the  band  edges)  to  ensure  that  you  meet  the power
requirements at those frequencies.  If required,  return to the center
frequency  and adjust  the power so  that  you  meet  the requirements
across the band.

Once you  have completed one  of the power  level setting adjustments,
select the other required  power level setting  and  repeat  the above
procedure to obtain the desired power level on that setting.



Once you have completed the radio level tuning  adjustments, press the
"EXIT"  F10  key to  return  to  the Radio Alignment and  Service Aids
screen or press the ESC key to return you to the Main Menu.

                 * * *  END  OF  HELP  TEXT  * * *
