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mt2000 vhf/uhf narrowband

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wa1emt

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i have researched and read alot on the internet but am still confused.
I have a vhf and uhf mt2000. I am using dos rss and i belive its version 6.
Id like to get the radios to accept narrowband but the software wont allow me to highlight and change that field. It stays at 25. I heard that using labtools would cure this and i also heard it has to be flashed and some says it does not.
Could someone let me know what the truth is...
 

radioman2001

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Won't work, if the radio doesn't have it in the options screen 25/12.5 the radio is not capable. That option is in the firmware of the radio not software. The radio probably has an "A" in the model number. "B,C,D" should work. Also depending on the model number the radio can or cannot do 7.5 kc spacings on VHF
 

wa1emt

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Oh its capable however, when i do the test it says R02.04...does this help anyone.
 

mmckenna

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Is R02.04 the version of RSS? Because that won't make a difference. It's got to be the build model of the radio. What would help is if you posted the full model number of your radio, or decode it yourself over on the Batlabs site.

MT1000's are pretty old, and it wouldn't surprise me at all to find one that wasn't narrow bandwidth capable. Might be time to upgrade.
 

wa1emt

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the UHF one is a bn narrowband model
the VHF one is a R2.01 which is the version of the firmware in the radio.
It is also an AN on the model number
 

MTS2000des

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all MT2000's can do 12.5KHz per channel, only ones made after April 1998 with F/W version 2.11 or higher can do splinter channels. If any of your conventional channels are splinters channels (e.g. 154.8225), you will get the error message "ERROR: UPGRADE TARGET RADIO FIRMWARE BEFORE CONTINUING" which of course, is not possible as the MT2000 is not a Flashport radio and firmware is hard coded in ROM.
 

Duster

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Try this...I was confused by the same thing until I realized how /\/\ software worked:

You are correct; you cannot directly change the "Channel Spacing" value...what you need to change is the value above it ("Tx Deviation"). when you change the Tx Deviation, the Channel Spacing value changes with it. Change Tx Deviation to 2.5, and the channel spacing changes to 12.5.

Let us know if that works.

Duster
 

wa1emt

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Thanks duster...
It worked, however...it wont take some of the narrowband frequencies. That confuses me.
It wont take 155.7525 but it will take 151.1375
Any ideas...
 

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The radio will do 12.5k steps but will not do 7.5k steps
 

wa1emt

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Oh ok I get it now....Thanks so much...
I guess there is only so much this mt2000 can do
 

SteveC0625

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The radio will do 12.5k steps but will not do 7.5k steps
This problem is going to surface a lot in the months and years ahead with many different radios.

Agencies that already have enough legacy channels will probably never even notice the issue, but others will as splinter channel licenses are issued.

FWIW, some older radios will do NB, but only the 12.5 steps. Newer ones may do 12.5 and 7.5, but not the ultimate 2.5 steps.

As the OP found out in this thread, this is something to pay careful attention to when purchasing a used radio for Part 90 applications.

Every time I learn about another radio's limitations, etc., I write it down on a note card. The same questions about the same radios keep popping up over and over these days.
 
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