a) Initial Powering Up and Radio
To select one of the available radios, power the M/P and press the A and then B. When prompted with FUN?, enter 1, 2, 3. The LCD will display the first radio selection. With the # key, step through the available radios. The selection goes to the end and repeats. Once identified, press the 1 key and the LCD will show PLEASE WAIT - (flash memory is being reprogrammed).
Note: This selection is done once
for the radio being used and is stored in flash, remaining there until
Also Note: For a 6 Meter radio, additional repeater offset prompts will be displayed.
The initial display (for a 2 meter radio): The receiver frequency is set to 140.000 Mhz, Simplex Mode. Transmitting is NOT allowed.
RCV 140000 NOT
For an odd offset, press A and then 4, and ODD? will be displayed. Enter the desired frequency. If within the allowable receive range , the LCD will indicate ODD. If out of range, the M/P reverts to the simplex mode. This offset will remain for as many subsequent transmissions as needed.
This odd split may be programmed into one of the 20 available channels. However, if the user steps the frequency up or down, or starts a memory scan when an odd split is being used, the system reverts to the simplex mode.
Reverse swaps the transmit and receive frequencies (POSitive or NEGative offset modes only). To activate, press A twice, and the M/P will swap the frequencies, letting the user hear the repeater input and transmit on its output. This frequency combination may be loaded into a scannable channel. To restore, push the A key again. The reverse mode is also deactivated (reverts to simplex) in a directed or memory scan.
The M/P Controller design supports 100 scannable channels contained in 5 banks of 20 channels (00 - 19) each . Only one channel group (20 channels) can be active at a given time.
To select a channel group, depress the B key followed by the 1 key. The M/P will then display:
SELECT CHAN GRP
GRP = 1, 2, 3, 4, 5 ?
Press 1, 2, 3, 4 or 5 to select the group and the M/P will respond:
SCAN CH GRP IS (1, 2, 3, 4, 5)
The Channel Group selection is retained in flash memory and will remain there until it is changed by reprogramming.
g) Programming a Channel
To program a frequency into a channel slot, first set these parameters (in the following order):
To load this data, press the B key receive a PGM? prompt.
Then enter a C, after which CHAN-? will be displayed. The channel number (between 0 and 19), is then entered, and the M/P will store the above.h) Assigning Alpha Tags to Channels
j) Inspecting Channels
To inspect the channel assignments, push the C key, followed by *. The M/P will then show the status of Channel 00, either EMPTY, or otherwise, viz:. frequency, any alpha tag assigned and CTCSS (if assigned). When inspecting an assigned channel, the M/P will activate it, as well as any assigned CTCSS tone, but transmitting will be blocked.
For the next channel, press #. The channels will run from 00 - 19, and then restart. To return to Channel 00, press *.
Important Note: Depressing the D Key to unblock transmitting on the inspected channel may result in transmission on the incorrect offset for the first transmission, but subsequent transmissions will be correct. This feature will not work for 'odd' offsets.
The code has been modified in the new Integrated M/P to select the proper offset after the D key is depressed in the inspection mode. A similar update is available in the legacy processor (Version 1.3). If you are using the legacy processor and would like this feature, email me.
Use this feature to select and to transmit on a scannable channel, especially one with 'odd' offsets.
k) The C Key - Used For All Scanning Functions and CTCSS Selection / Tone Search
The M/P can scan the:
The controller scans about 12 channels per second and will pause after having stopped on an active channel for more than 50 seconds. When paused, RCS will be displayed before the frequency. To resume scanning, push C.
To momentarily interrupt scanning, depress C while scanning is in progress, and the system will stop, displaying the current frequency. The user may transmit. To restart scanning (provided the pause time does not exceed 50 seconds), push the C key again.
To scan the 20 programmable channels, press the C, and then 0. If none of the channels are programmed, UNAV will display.
To retrieve a programmable channel, press the C, and then 2. Then, enter the 2 digit channel number, If the channel is unassigned, EMPTY will display. Once loaded, both reception and transmission will be allowed.
To store the temporary channel (always 00), depress the B and then A, storing the active parameters including the CTCSS tone into channel 00. The alpha tag will be set to TEMPY CH. This is a quick way to return to that elusive channel while driving cross country. To avoid the possibility of 'losing' it, the flash memory is programmed whenever a temporary channel is selected.
To lockout one of the 20 programmable channels while the scanning is underway, push the A key while the carrier is present. Once done, the M/P will advance to the next scannable channel. As many of the 20 channels can be locked out, as desired. Some conversations can be quite boring. The channels will remain locked out until the:
To activate the pre programmed (directed) scan functions, the following keys are used - 5 for the VHF Weather Scan (on 2 meter radios) and 6 for the GMRS / FRS scan (all 440 Mhz radios). Transmitting is not allowed on these frequencies.
The M/P has been programmed with Scan Delay capability that is operational in all 3 scan modes.
After power up, the system will start in the Scan Delay mode which means that the M/P will 'wait' for about 3.5 seconds before going on to scan the next channel after the carrier has dropped. This provides time to listen for a possible subsequent transmission on this channel without having to abort the scan.
The system can also be programmed to advance to the next scannable channel almost immediately after the carrier drops by pushing the C key and then the 4 key. To revert back to the default Scan Delay, depress C and then 3. In either case, the response will be OK.
l) CTCSS Functions
The C Key is also used to activate the (optional) CTCSS, 'personalized' for the MX-COM MX-465P chip. The CTCSS Tone selection is changed by pressing C twice after which the following will be displayed:
In response, directly enter the CTCSS value e.g. 250.3, (the decimal point automatically appears). If the data entered is a valid tone, the system will respond with an OK and the tone will be activated. If an incorrect, the system will respond WRNG and recycle. This function will 'time out' if pauses between the keystrokes are longer than 15 seconds.
The current CTCSS frequency can be stored into one of the 20 programmable channels, and will displayed in the upper right LCD corner (and activated) when 'inspecting' channels or when a scanned channel is activated.
m) Tone Scan
To find the CTCSS frequency, press C and then 9. Transmitting is not allowed during the Tone Scan which will run to completion until either the received tone (or no tone) is found. This can help determine the CTCSS frequency without manually stepping through all of the tones on a dark nite in your car.
- M/P Board e/w MX-465P Chip - Legacy Design
If using the board with the MX-465P chip, the M/P will scan all tone frequencies - 4 each second - updating the LCD. The CTCSS Detect LED will light if the tone is detected. A complete Tone Scan with carrier always present will take about 30 seconds.
- M/P Board with Integrated Tone Encoder / Decoder - New Design
If using the new M/P board, the encoding and decoding of the CTCSS tones is done within the chip itself. It's a less expensive, more elegant solution. When decoding the CTCSS frequency, the M/P will take about 4 seconds to identify the tone, providing carrier is present. Since there is no Tone Detected LED (as there is no external CTCSS chip to drive it), the detected tone will be displayed in the LCD.
If the M/P is unable to decode the tone, one of two possible displays will appear.
When initiated, the M/P will continue to scan the channel (when the carrier is present), and wait until the carrier returns. To abort the Tone Scan, briefly depress and release the mike PTT.
Note: Tone Scan may be activated with no carrier present. In effect, the M/P will stay 'camped' on the frequency until either:
- carrier activity and a CTCSS tone are detected, until
- until the D key is pressed, or until
- the PTT button is flicked.
To turn off the CTCSS tone, press the C and then 7. The M/P will respond CTCSS TONE OFF!
To reactivate the same
CTCSS tone, press the C and
M/P will respond CTCSS
TONE IS ON
Pressing the D key will reset the system to its previous state. For example, if an error occurs while entering a frequency, push D and start over. The D key is also used to abort any of the SCAN modes. The D Key can be used to manually reset the LCD display, if needed.
DISCLAIMER - - If you follow the steps outlined herein, you do so at your own risk. I cannot, nor will not, be responsible for any possible damage to radio equipment, personal property, to yourself or to others caused by modifications that you may make to the radio as a result of your reading this.
Copyright 2010 - K3JLS