Question about Motorola MU21CV (1 Channel) 2-Way Radio

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Help I just my radio frequencies changed yesterday. Now the three buttons on the side are not working. The blue one and the two black ones

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Programming issue, take it back to where you had it programmed and have them correct the issue.

Posted on Jun 24, 2008

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  • Contributor
  • 47 Answers

Can you put the radio on the computer and using the correct CPS can you read the radio?

Posted on May 26, 2008

  • proff 128
    proff 128 May 26, 2008

    I have been repairing 2 ways for the last 28 yrs

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1 Answer

My memory function is not working when i press the v/m button. can i reset the settings?


Your question is lacking much information to get the help you want. You failed to mention what radio you have, make and model will help. As for your question as it relates to most two way radios, the V/M button does not save frequencies to your memories. It only shifts your radio from one mode to the other. If you did not save frequencies to memory's , you will not get any when you enter the M, for Memory mode, also V is for VFO, or Variable Frequency Oscillator. in VFO mode, that is where you type a frequency in on the keyboard, and the radio will tune to it, but only if the frequency is within the range of frequencies that the radio is made to use. For help in saving memories, you need to mention the make and model of the radio. But to educate you past this point, so you may help yourself, go to Google and type the make and model of your radio into the search, one of the links that should come up if you spell it all cirrectly is the web site for the maker of the radio, and all the help you would need shluld be there. In fact, that is just what I would do to answer your question, but since you left all that information out of your question, I could not.

Nov 23, 2014 | Two-Way Radios

3 Answers

I have 4 motorola walkie talkies the channel numbers on one do not match the other three when they are on the same frequency how do i reset the one that is wrong


If they're not exactly the same model they may have different channel indexes. If the "oddball" is a combination FRS/GMRS or if the other 3 are, they'll have different numbering. As long as you can talk between all of them, just make note of the "right" numbers when they're working.

Jun 01, 2014 | Motorola Walkie Talkies 2-Way Radio

1 Answer

Motorola mt series not connecting to each other


Activate the "channel monitor" button on one radio while talking on the other and see if you can hear the voice. Then reverse the procedure: talk on the first one while holding the monitor button on the other one. If both radios work with the monitor button held down but will not work without then the CTCSS or CDCSS squelch codes aren't set to the same tone or digital frequency or code. Consult the manual for more information.

Dec 26, 2013 | Motorola Walkie Talkie 2-Way Radio

1 Answer

Trying to program sp21 to a sp10


If your SP21 and SP10 are both either VHF or UHF, it is possible to program them to match one another.

The SP10 is limited to 16 available channels, programmable by 4 dip switches behind the battery compartment of the radio. Great care must be used in removing the entire battery tray to get to the dip switches. Many times we see radios which have damaged mylar battery leads when someone attempts to get to the dip switches by removing the thin plastic/copper liner behind the battery. DO NOT remove this piece. It will come out with the battery tray. The tray is somewhat of a picture frame which holds the battery in place. In the SP10 radio it is removeable by slipping a small screwdriver or thin car key in the slot at the bottom of the radio and gently prying up. This will begin to dislodge the tray and you can pick it up and pull it out of the radio. (The upper battery contacts near the center of the radio will remain with the radio. The bottom battery contacts, if any, will come out with the tray.) At this point you should be able to see the 4 dip switches. The four most common VHF settings are:

ALL ON = GREEN DOT
ALL OFF = BLUE DOT
2 ON 2 OFF = RED DOT
2 OFF 2 ON = PURPLE DOT

Your preference on these should be limited to green and blue dot, as they are license-free, and are the only wideband frequencies still okay to use after Jan. 1, 2013, when the narrowband change takes place.

If your SP10 is UHF, or has 8 additional dip switches in the lower left below the main component board, you have PL. It would be best if you call someone who can help you with programming, as it is too lengthy to type more about this here.

The SP21 is PTT programmable. You hold in the PTT button while turning the radio on, and it will announce its frequency, press the monitor button once, and it will both lock in your frequency setting and announce the PL code setting. Either of these is changeable by pressing the PTT, followed by pressing the monitor button to lock in the new setting.

The primary VHF settings for the SP21 are as follows:
Freq 1 = Red dot
Freq 2 = Purple dot
Freq 3 = Blue dot
Freq 5 = Green dot

Once again, your preference, if you are VHF, should be toward Blue and Green dot frequencies.

Best regards.

Sep 28, 2012 | Motorola Walkie Talkie 2-Way Radio

1 Answer

I have a motorola mv11c and it works fine and I just purchased a pair of motorola mv21cv. They must be on a different frequency my question is how do I change the frequence on my mv21cv radios to be...


Hold in the PTT button while you turn on the radio. It will announce the frequency number. You can use the PTT button to change the number. Then press the Monitor (small possibly red) button to lock in your setting. The next number your radio announces will be the Code. Use the same method to change the code if needed. Then press the Monitor button to lock in your setting. Once you have set both your freq and code you can turn the radio off, then turn back on normally and use the radios.

Best regards.

Jul 22, 2011 | Motorola MU21CV (1 Channel) 2-Way Radio

1 Answer

How do i change the frequency on the radio


To enter 'Programming Mode', press and hold

both the PTT button and the monitor button

simultaneously for three seconds, while turning

ON the radio. A unique tone will sound,

indicating that the radio has entered
'Programming Mode'

You can then use the Menu and the plus or minus buttons to program several of the features of the radio. Depending on whether you have a single channel or multi channel model radio, the order of the menu will differ.

Here is a link to the user guide where you will find more detailed instructions and a frequency and PL code chart: http://www.giantintl.com/RadioPDFs/Outdated%20Manuals/XTN_Series_User_Manual_E.pdf

Best regards.

Apr 05, 2011 | Motorola XU1100 (1 Channel) 2-Way Radio

1 Answer

How to change channel


Spirit GT: Programming a Frequency to a
Selected Channel:
1. Press and hold down the Push-To-Talk
button while turning the radio on, wait for
approximately 5 seconds then release the
Push-To-Talk button.
2. Use Scroll button to select one of the 8
frequencies.
3. On a Spirit GT+, press the Monitor button.
4. The current channel will flash, press scroll
button to change channel.
5. After the second channel is selected, press Monitor button again, current
frequency for second channel will flash. Figure 16.
6. Use Scroll button to select new frequency.
Exit Programming Mode - 3 Ways
1. Press Push-To-Talk to exit completely.
2. Allow the Menu time to expire (10 seconds).
3. Press Menu button to go to code programming.

Here is a link to the user manual: http://www.motorola.com/mdirect/manuals/Spirit_GT_User_Manual_E.pdf

Jul 17, 2009 | Motorola Spirit GT Pro (2 Channels) 2-Way...

1 Answer

How do i change the channel?


Programming a Frequency to a
Selected Channel:
1. Press and hold down the Push-To-Talk
button while turning the radio on, wait for
approximately 5 seconds then release the
Push-To-Talk button.
2. Use Scroll button to select one of the 8
frequencies. Figure 16.
3. On a Spirit GT+, press the Monitor button.
4. The current channel will flash, press scroll
button to change channel.
5. After the second channel is selected, press Monitor button again, current
frequency for second channel will flash. Figure 16.
6. Use Scroll button to select new frequency.
Exit Programming Mode - 3 Ways
1. Press Push-To-Talk to exit completely.
2. Allow the Menu time to expire (10 seconds).
3. Press Menu button to go to code programming.

Here is a link to the user manual: http://www.motorola.com/mdirect/manuals/Spirit_GT_User_Manual_E.pdf

Jun 25, 2009 | Motorola Spirit GT Pro (2 Channels) 2-Way...

1 Answer

Can't Switch Frequencies


Your radio needs to be programmed to match the radios at work. Currently your channel 3 frequency is the same as work, but your code on channel 3 is not. Here is a step by step explanation:

1) Turn on the WORK radio, watch the upper right corner of the screen. It will flash the frequency number, followed by the code number. Note these numbers.

2) Put your radio in programming mode by turning on the radio while holding down the PTT and MON buttons. Continue to hold these buttons until the 'noise' stops.

3) Press the MENU button once. Now, using the + or - buttons choose the frequency number.

4) Press the MENU button to lock in your frequency. This will take you to your CODE. Press the + or - button to choose your CODE.

5) Press your MENU button to lock in your CODE.

6) At this point you can walk through the rest of programming features or simply shut the radio off and begin using it. Note: You will know when you are at the end of the programmable features because it will chirp a different beep than you have been hearing when you've pressed the MENU button to lock in your new setting.

If you need more assistance, give eradiostore a call.

Mar 12, 2009 | Two-Way Radios

1 Answer

It appears that my mike on one unit does not work.


Check your programming by holding in the PTT button while turning on the radio. The first announced number is your frequency. Press the MONITOR button, and then it will announce your code. Press the MONITOR button again finish. Then shut the radio off and back on for normal operations.

If the numbers on your radios do not match, you can use your PTT button to change the number it has announced. Press the MONITOR button to lock in your new setting after setting the frequency and/or code.

Final thought, check your mic hole on the face of the radio to be certain is does not have debris or tape over it.

Mar 02, 2009 | Motorola MU21CV (1 Channel) 2-Way Radio

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