GP300 narrowband programming

[SCPD]

So, as many know already, there was a link posted a few weeks back to a Moto document listing the GP300 models that can do 12.5 khz. Of the radios I have checked so far, about 2/3 of my GP300's are narrowband.

So I tried my hand at seeing about trying to program a GP300 to narrowband. And although it didn't work, it got a little interesting.
The only software I've ever used for the GP300 is HVN9852. Software version R05.00.00 dated 15-JUL-93.
The radio I tried programming is model P94YPC00C3AA. I never seen any screens that let me choose 25 or 12.5. There is a screen to adjust deviation, but it's a radio-wide setting, and I'm pretty sure that's not it.

So since it didn't work, I got on the 'net to find the latest version. Here's where it got interesting. From what I read, the software to program a GP300 is HVN9128, and the latest version is R08.02.00 11/96.
According to what I read, HVN9852 is for programming P110's. Like I said, I've programmed a hundred GP300's using HVN9852.

Anyways, has anyone been able to program narrowband into a GP300? If so, what software package are you using, and what is the version? I can save a whole lot of money if I can keep using some of my GP300's when narrowband is mandatory.

Thank you.

 

[Batwings21]

GP\GM300's were either wide band or narrow band. They are not wide/narrow switchable, they have different rf boards in them, so if the model # comes back narrow that's what it is unless someone converted it by changing filters on the rf board and adjusting deviation.

 

[davidgcet]

as Batwings21 said, your NB capable GPs are already in NB mode. i'm surprised you never noticed the difference in audio when talking from a WB to a NB model.

EDIT:

also the GP300 used the P110 software to program. the 9128 was for GP350s, though it may have also worked for GP300's. i have always used the 9110/GP300 software for programming/alignment and never had any issues.

 

[SCPD]

Thanks for the help

as Batwings21 said, your NB capable GPs are already in NB mode. i'm surprised you never noticed the difference in audio when talking from a WB to a NB model.

Thanks for the help. I've always noticed differences in audio, but just figured it was the way someone was talking into, or distance from the mike. Until I seen that Moto document, I never knew that the GP300's could be two different deviations. I've always programmed newer radios to 12.5 khz.

 

[RodStrong]

How about a GP88, the GP300's cousin? Anyone know if it will do NB?