Radio Repairs
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Repair Form

Important note:  The following information allows the user to program receive and transmit frequencies into the radio.  The user of this information assumes all legal consequences of transmitting on frequencies not allocated to them for their use, even if by accident.  Some radios may need proper realignment in order to perform on the programmed frequencies or in order to operate at best performance. A qualified technician using proper test equipment should perform any required realignment.

Frequency Information:

The frequency information to be programmed into the radio must be obtained by the user.  The frequencies given in the examples listed in the Programming instructions are not allocated frequencies.  

Programming Preparations:

1. Programming Preparations:

   Items required:

   1. One T-9 or Torx 9 head screwdriver.
   2. One clip lead.
   3. A power cord connected to a 12vdc source.

   Getting the radio into the programming mode:

   1. Disconnected the radio from its DC supply until the disassembly is complete.  Turn the radio on to drain any remaining charged voltage.
   2. Using the T-9 or Torx 9 head screwdriver remove all six screws securing the bottom case to the chassis of the radio.
   3. Carefully remove the bottom case and set it aside.
   4. Locate the row of 20 pins directly in front of the microprocessor (the largest chip or Integrate Circuit, IC in the front left corner of the radio).  With the front of the radio facing you, count from left to right to pin 11 and bend it out away from the other pins. 
   5. Connect the clip lead from chassis ground to pin 11.  When programming is complete the jumper wire as to be removed, as it will prevent the 16 channel radios from transmitting when the pin is connected to ground in the user mode.
   6. Connect the radio to a properly fused (7 amp max) 12vdc supply.
   7. Turn the radio on. 
   8. Momentarily select the Pro. Pri. (Program Priority) key (the display should start flashing), then momentarily select the 0 or 10 key and the display should go blank.  The radio will not be in the programming mode until the display goes blank.  After the display is blank you can remove the short to pin 11.

You will need to make a list of frequencies has been written in the sequence as listed below:

The tone chart below is a list of available tones that the radio is capable of receiving and transmitting.  Use the two digit tone code to indicate the tone frequency that is needed for the channel:   Ex. – Desired tone frequency = 127.3Hz, use tone code 19.

When your list is complete you will have the information in proper sequence so that program entry errors will be minimized.

Programming steps:

Example 1:  The receive and transmit frequency are the same with no CTCSS tone.

1. When the display is blank enter the following digits, pressing each key momentarily:

154600  00 00

2. Momentarily press the ENT key.
3. Momentarily enter the channel number that you want the frequency data to be saved to. Channels 1 through 10 are a single keystroke. Channels 11 though 16 require a two digit entry – when one is selected it goes to the left display LED waiting approximately 3 to 4 seconds for a second digit. If no other digits are entered the data will go into channel 1. 

To review the channel for proper frequency and tone data select the MAN or manual key and then the channel number you want to check.

What do the digits mean?

The first six are the receive frequency.

The next two tells the microprocessor that the transmit frequency is the same as the receiver.

The last two tells the microprocessor that no tone is required for receive or transmit.

Example 2: The transmit frequency is different from the receiver and a tone of 100Hz is required for receive and transmit.

1. When the display is blank enter the following digits, pressing each key momentarily:

154600  80 12 12  151625

2. Momentarily press the ENT key.
3. Momentarily enter the channel number that you want the frequency data to be saved to. Channels 1 through 10 are a single keystroke. Channels 11 though 16 require a two digit entry – when one is selected it goes to the left display LED waiting approximately 3 to 4 seconds for a second digit. If no other digits are entered the data will go into channel 1. 

To review the channel for proper frequency and tone data select the MAN or manual key and then the channel number you want to check.

What do the digits mean?

The first six are the receive frequency.

The next two (7^th and 8^th digits) tells the microprocessor that the transmit frequency is going to be different than the receiver frequency.

The next two (9^th and 10^th digits) tells the microprocessor that a CTCSS tone is required for receive at a frequency of 100.0Hz (Tone Code 12).

The next two (11^th and 12^th digits) tells the microprocessor that a CTCSS tone is required for transmit at a frequency of 100.0Hz (Tone Code 12).

Important note: Any tone code combination can be used in the receive and transmit tone code.

The last six are the transmit frequency.

Example 3:  Receive only  - the transmit frequency is disabled to prevent accidental keying of the microphone on a frequency not allocated to the user. 

1. When the display is blank enter the following digits, pressing each key momentarily:

154600  04 00

2. Momentarily press the ENT key.
3. Momentarily enter the channel number that you want the frequency data to be saved to. Channels 1 through 10 are a single keystroke. Channels 11 though 16 require a two digit entry – when one is selected it goes to the left display LED waiting approximately 3 to 4 seconds for a second digit. If no other digits are entered the data will go into channel 1. 

To review the channel for proper frequency and tone data select the MAN or manual key and then the channel number you want to check.

What do the digits mean?

The first six are the receive frequency.

The next two tells the microprocessor that the transmitter is disabled.

The last two tells the microprocessor that no tone is required for the receiver.

Example 4:  Transmit tone is different than the receiver

1. When the “P” is in the display enter the following digits, pressing each key momentarily:

154600 80 19 12 151625 

2. Momentarily press the ENT key.
3. Momentarily enter the channel number that you want the frequency data to be saved to. Channels 1 through 10 are a single keystroke. Channels 11 though 16 require a two digit entry – when one is selected it goes to the left display LED waiting approximately 3 to 4 seconds for a second digit. If no other digits are entered the data will go into channel 1. 

If the proper number of digits has been entered into the channel memory, the LED display will go back to being blank.

To review the channel for proper frequency and tone data select the MAN or manual key and then the channel number you want to check.

Deleting a channel from memory:

Important note:  It is necessary to have all unused channels deleted from memory so that the radio operates at maximum performance.

While the display is blank:

1. Momentarily select the DEL or Delete key.
2. Momentarily select the ENT or Enter key.

3.      Enter the channel number to be deleted.

Features Programming

The features listed below affect all of the programmed channels.

Scan Delay

The amount of time the radio will stay on a received channel, after the signal goes away, before resuming scan.

Select one number from the chart.

Transmit Time-Out-Timer 

The period of time that the radio will continue to transmit from the time that the PTT switch on the microphone is depressed.  If the Push-To-Talk switch is still depressed after the programmed time, the radio will stop transmitting and a busy signal or tone will be heard through the speaker.  Select one number (code) from the chart below.

Decode delay

A Zero should always be used for this option, to enable the internal tone functions.

Programming the Radio Set up Data:

1. While in the Program mode enter the three digits that you have selected, one for each table (Scan delay, Transmit time out, a zero for the Decode Delay.
2. Press the “ENT” or Enter key. 
3. Press the “Scan” key.  A small u should appear in the display. 

Factory programming is: 000

Even if the configuration is not being changed it is recommended to verify the three digits are correct.  A wrong digit in the third position, other than 0, will cause no tone in transmit and the speaker will sputter when the radio receives a signal. 

Reviewing programming information:

When in the programming mode (blank display):

1.  Momentarily select the MAN or Manual key of the keypad and then momentarily select a number of the channel you wish to review.  Channels 1 through 10 are a single keystroke. Channels 11 though 16 require a two digit entry – when one is selected it goes to the left display LED waiting approximately 3 to 4 seconds for a second digit. If nothing is programmed into channels 11 through 16 then radio will review the programming of channel one after momentarily selecting a one.  You will need paper and pen in order to write down the programmed frequency information.  This information could be incorrect if the radio suddenly stopped working.
2. To review the next channel momentarily select the MAN key and then the channel number of the next channel to be reviewed. 

User Mode

1. Turn the radio off when you have completed all of the programming.

2.      Reinstall the top cover of the radio making sure that the speaker wires did not break loose during the programming process.

3.      Install the bottom cover.

4.      Insert the five bottom screws and tighten.

User Programming

The programming jumper must be disconnected to allow for transmit to occur.

Scanning Channels

1. Turn the radio on.
2. Select the MAN or manual key to step through the channels that are currently listed as a scan channel.
3. Select the number of the channel to be added to scan. 
4. Select the ENT or Enter key.  

Deleting a Nuisance Channel From the Scan Mode

1. Select the number of the channel to be deleted from the scan mode.
2. Momentarily select the DEL or Delete key.

Selecting a Priority Channel

A priority channel must be selected in order for the scan mode to work properly. 

1. Select the channel you desire to use as the priority channel.
2. Select the Pro Pri or Program Priority key.

3.      Select the ENT or Enter key.

Safe Radio Operation:

1. Do not transmit on any antenna that is not designed for the specific frequencies and power rating of the radio.  Damage will occur and can be extensive to the point of the radio not being repairable.
2. The antenna should be tested at least once every 3 to 4 months for proper ground and SWR readings by a qualified technician.
3. Never transmit when someone on the outside of the vehicle is within 5 feet of the antenna.
4. Use 14 gauge wire or for both the positive and the negative lead and be sure that the line is fused.  For the lower power radios the fuse should not be rated lower than 5amps or higher than 7.5 amps.  Use 12 gauge wire on the 60 watt mobiles with an inline fuse rated at 20 amps.

Definition of terms:

Simplex – The channel will Receive and Transmit on the same frequency.

Half duplex – The channel will receive on one frequency and transmit on another. 

Tone – Also known as CG or channel Guard, PL or Private Line, CTCSS or Continuous Tone Coded Squelch System.  The radio requires the tone to be converted to a two digit number for programming purposes.   It is used when more than one company or agency share a transmit and receive frequency.  It is also used to allow a specific tone to gain access to a repeater when the channel is programmed for half duplex.

Radio Specifications