Question about Uniden GMR638-2CK (22 Channels) 2-Way Radio

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Two way radio cross model compatbility

Can i use a uniden model to communicate with motorola model handset or with another uniden model?

I have a pair of 6 Mile range uniden and i am plannig to buy another pair of 10 mile uniden. can i have a one to many using the four handsets. what should i do for that

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Re: Two way radio cross model compatbility


Normally yes just as long as the frequency assignment to each channels are the same and no security/locking (such as (CTSS) is in place.

You have to check if the frequency settings of the Motorola matches those of the uniden.

Good luck and kind regards.

Posted on Oct 23, 2007

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Who knows where can i buy a 50 to 100 mile two way radio

You would need a repeater (maybe two repeaters) to carry a signal that far. For such long range communication, I would suggest using a cell phone with PTT (Push to Talk) feature. These phones can transmit nationwide on the cellular network. AT&T carries these phones as well as Nextel and Boost Mobile. These phones are now standard issue for the United States Secret Service.

These phones can act just like a standard two-way radio as well as a cell phone. Several Motorola model phones can be used on these networks and also have MotoTalk.

MotoTalk is a feature of PTT handsets that allows communication between two or more units even when they're out of range of the cellular network. (Maximum range is stated as being up to 8 miles - but realistically it's closer to about 4 miles depending on terrain).

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Problem transmitting

Hello jayhawkrx,

Check the Continuous Tone Coded Squelch (CTCSS) settings on all the radios. (Note that some manufacturers refer to this feature as a Privacy Code or Quiet Code. The actual name of the feature may vary.) This feature encodes a low-frequency signal on your radio transmission. This signal is below the range of human hearing but can be detected by other radios. When the CTCSS feature is active your radio will ignore any signal that it receives that does not have the proper tone encoded on it.

In order for these radios to communicate, all of the radios need to be on the same channel and have the same CTCSS code programmed or the CTCSS feature must be disabled.

I suspect that CTCSS is activated on one of your radios but not on the other. This would result in the situation you describe.

Also take note that when using different brands / models of radios to communicate with one another that the CTCSS code numbering scheme may not necessarily be the same from radio to radio. For instance, CTCSS code 4 on the Motorola TalkAbout series actually corresponds to code A on the Motorola Sport models.

Best Regards,

Agent Ken
Go Ahead. Use Us.

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Are you sure both radios has the same Squelch Code and QT?

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