Motorola CDM750 6 Meter Deviation

The General forum is where users can discuss any topic regarding Motorola communications equipment - hardware, software, etc. There are also several focused forums on this board, so please take the time to ensure that your questions doesn't fall into one of those categories before posting here!

Moderator: Queue Moderator

Post Reply
skyler440
New User
Posts: 5
Joined: Tue May 16, 2017 6:36 pm

Motorola CDM750 6 Meter Deviation

Post by skyler440 »

I have a Motorola CDM750 I am attempting to get in the 6-meter ham band. The VCO locks to around 53.5MHz which is good enough for me to use for my main purpose at 52.525 simplex.

I am trying to get the deviation set right. The max deviation past 51MHz decreases from 5KHz at 50MHz to about 1.5-2KHz at 52.525. I have changed all of the tuning piers with the W9CR waris chirp script, so I can get the TX power stable across the band, but I am unable to find any setting in the tuner software for deviation.

Anybody have any experience with the CDM750 for ham bands, in particular 6-meter? Is it possible to modify in only software, or is a hardware modification required as well?


Thank you,
Skyler KD0WHB
KitN1MCC
Posts: 1890
Joined: Wed Jan 16, 2002 4:00 pm
What radios do you own?: ht1550 XLS,6 MT-1000,

Re: Motorola CDM750 6 Meter Deviation

Post by KitN1MCC »

The CDM on lowband are known to burn out
skyler440
New User
Posts: 5
Joined: Tue May 16, 2017 6:36 pm

Re: Motorola CDM750 6 Meter Deviation

Post by skyler440 »

KitN1MCC wrote:The CDM on lowband are known to burn out
What does that have to do with deviation though?
AD0JA
Posts: 66
Joined: Mon Jun 01, 2015 6:14 pm
What radios do you own?: APX6000, APX7000, Quantar, XPR

Re: Motorola CDM750 6 Meter Deviation

Post by AD0JA »

I had this issue with a 6m lowband 1250 as well. Never could figure out how to fix it, I read the BSM and re-aligned everything in the tuner but no luck. Gave it back to its owner so too late now.

The GE MLS1 lowband works much better. I made an Excel spreadsheet to calculate hex values for it.
KitN1MCC
Posts: 1890
Joined: Wed Jan 16, 2002 4:00 pm
What radios do you own?: ht1550 XLS,6 MT-1000,

Re: Motorola CDM750 6 Meter Deviation

Post by KitN1MCC »

Just giving info.
Post Reply

Return to “General Motorola Solutions & Legacy Radio Discussion”