Issues with Motorola CDM750 programming in ham band using chrip and CPS

Issues with Motorola CDM750 programming in ham band. Using chrip I can read and write files, but using CPS R06.12.02 or R06.12.09 it fails to read or write to the radio.
If you have any input please let me know.
Thank you 73
KK4EQF

[@geezershire227]

I wonder if you go in chirp disable the trunking portion since that's a 750 model

[@ipodbuff]

Can you please make a video on how to program these radios and what we need in order to program?

[@Subgunman]

Chirp probably corrupts the check sum creating the error. Back in the days of hacking Maxtrac radios, one had to be careful to correct the checksum after doing mods to the .MDF FILE. I would like to think that the big /\/\ has continued with this habit. There are various versions within the same model type that might affect things as well as to what version of CPS was used to program each radio before you hit it with Chirp. Are you using the most recent version Chirp Next? One might have to blank out the radio completely with Lab Software and reprogram it to its original configuration. Another item to consider, The Serial Number. It must remain the same as the original serial number. Unless you use Lab to change the SN you could be causing issues with the radio.
These are possible suggestions to take into account from using the older series of the 1225 series of radios. I was told to use a Hex Editor program and modify the .MDF file for all occurrences of the lower frequency.I was also warned to make memo of original check sum value. It must be restored to the original by modifying bits in the page describing the version of the program. Not sure how. I still have not tried it. One other issue, that tone might be a sign that the VCO is unlocked thus "locking up" the radio.
There is a forum I believe called Bat Boards where you might search for more info. Fair warning, don’t ask for any Moto software on this site. 73 and good luck! I need to get my 1225 down to ham bands as well.

[@luish19779]

Chirp read the CDM Radios?

[@n3lee]

no RF channel in the radio to start...

[@scottcarrier1121]

I'm having the same issue....Mine are buiilt in a Motorola Case and the repeater is a Model # CDR 700 repeater. Not sure what the heck is going on....

[@Subgunman]

Motorola has a nasty habit if modifying the software that is loaded onto the repeater versions of these radios. I use a Desktrac repeater and I have to use two software packages to program these repeaters, one for channel data and another that sets various bits in the radios allowing them to work as a repeater, they mostly control the settings on the 16 pin connectors on the back of the radios. Motorola found it easier just to offer one software package dedicated to programming this repeater pair knowing how they operate. Good luck finding the software.

[@daltonkatiehall1888]

Almost sounds like in a loop possibly

[@WPGinterceptor460Interceptor]

That tone is a blank channel. You have to assign the channel after entering the freq/tone information. get the proper cable from radio to computer! sounds like the cable you made is incorrect.. spend the 20$ for the correct cable bud