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.  

Reviewing programming information:

The programming information of this model of radio can be reviewed without opening the radio by performing the following steps:

1. Supply 12vdc to the proper pins of the power plug of the radio.  If it is installed in a vehicle you may need to start the vehicle or at least turn the key until the radio has power.
2. Hold down the MAN or Manual key of the keypad and turn the radio on using the On/Off switch.  A “P” should be displayed in the LED readout.
3. Release the Manual key and 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.
4. To review the next channel momentarily select the MAN key and then the channel number of the next channel to be reviewed. 

RH256N Programming Information

Programming Preparations:

Items required:

1. One large tip Philips head screwdriver.
2. One pair of needle nose pliers or a pair of tweezers.
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.
2. Using the Philips head screwdriver remove all five screws located on the bottom case of the radio.
3. Carefully remove the bottom case and set it aside.
4. Carefully remove the top case pulling up from the rear of the radio.  There is a short two-wire lead that connects the speaker, mounted to the top case, to the inside of the radio. It might be necessary to unplug the lead from the main board of the radio to allow access to the programming plug.
5. Locate the programming plug in the middle of the radio, to the left and slightly to the rear of the black flex cable that goes from the front panel to the main board.
6. The plug should be white and slides on cover two of three pins. 
7. Using the tweezers or needle nose pliers slide the plug up and relocate it so that it covers the center pin and the rear pin or the PROG position.
8. Connect the radio to a properly fused (7 amp max) 12vdc supply.
9. Turn the radio on.  A “P” should be in the LED display, which means you are ready to program the radio.

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

1 5 4 600  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. 

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

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.

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

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

1 5 4 6 0 0  80 12 12  1 5 1 6 2 5

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 “P.”

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).

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. 

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

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

1 5 4 600  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. 

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