I started in electronics 33 years ago and my first job was in LMR;s (land mobile radios). I know they have changed a lot since then but the basic transmitting structure will always be the same. It sounds like something that I have never seen but one or two go bad but on these occasions the Crystal has changed frequency. This is your Local Oscillator and will cause your superheterodyne to run at a different frequency. It would be a constant frequency and explain the one channel. I know if the wrong crystal is put in one and is close enough to even run it can be several channels off. Check this out it is a little far fetched because as I said earlier these things seldom go bad but you never know. If it is a crystal then when you reset it it would reset to the same frequency that it has changed to. It is still working but just off frequency. Let me know how it turns out.
Later-
SOURCE: AXU4100 Manual or help
Hi,
On a Motorola AXU Series (including the 4100):
1. To unlock, press the “D” button for about a second or until the circle is gone. The circle with the line thru is the keyboard lock indicator;
2. To change channel, you need to press either the arrow left or right in Normal Mode;
3. To change PL (assigned to a channel), don’t think this can be done by the user
4. To change Ch. 1 from 464.500 MHz (PL-67.0) to 463.525 (PL-136.5), don’t think this can also be done by the user.
Even the built-in Programming Mode Parameters do not have this option to change assigned frequencies and PLs. An external programming software using a PC may or may not allow this.
These radios came pre-loaded with its channels assigned with specific frequencies/PLs. As used in a Motorola AXU411, they are:
Channel Frequency PL
1 464.500 67.0
2 464.500 77.0
3 464.500 88.5
4 464.500 179.9
5 464.500 None
6 464.550 67.0
7 464.550 82.5
8 464.550 94.8
9 464.550 179.9
10 464.550 None
Hope this be of help/idea. Pls post back how things turned out or should you need additional information.
Good luck and kind regards.
SOURCE: CLS 1110 Programming
Not certain what order you are doing it, so I will type a brief explanation:
With the radio turned OFF, hold in the PTT and the MON, while turning the radio on. Continue to hold the PTT and MON until the radio stops making noise. You are then in programming mode and can use the menu button to walk through the stages of programming.
SOURCE: how to set interference eliminator code on motorola two way radio
The FV300 does not have the interference eliminator code feature. (Sorry)
SOURCE: comunicating between different models, can it be done?
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SOURCE: Can't change channel of a Motorola Visar
The Visar has a channel lock feature. If you hold down the two channel buttons at the same time, it will do one of two things depending on the settings. Either the channel will lock, or the channel numbers in the LCD will flip.
If you press the channel button and the "popples" "pop" (for lack of a better word) then the channel selection buttons re most likely OK. To fix it you just press both channel buttons at the same time for about 5 seconds. It will beep and you should be able to change the channels. If not, then it needs to be repaired.
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