I got to looking in the schematics, and was going to try injecting the tone at U0221, pin 40, which is supposed to be the MOD IN, as it's labeled, but it's really the audio output (after all filtering, etc) that goes to the RF stage.
Instead of doing that, I found in the software that if you program pin 8 to "TX PL / DPL Inhibit (input)" you can actually control the CDM's PL tone encocoder. I checked on another repeater we use, the Motorola R1225, and it has the same option, I think it was on pin 6, though. On Mon, Oct 13, 2008 at 7:01 PM, Radio Guy <[EMAIL PROTECTED]> wrote: > If you find out how to do that, let me know!!!!! > I gave up and switched to Tait TM8110 it allows ctcss injection. > > > > We are using a pair of Motorola CDM-1250 UHF mobiles, 403-470 split, for > our > > UHF repeater along with an Arcom RC-210 controller. > > > > We want to strip the PL tone when CW and / or Voice ID's are sent. The > > arcom controller has the capability of sending logic out to the radio or > an > > external tone board to turn the encode on or off. > > > > Does anyone have any knowledge of how one might be able to inject the > CTCSS > > logic into the 16-pin accessory port, or otherwise connect to the CDM > radio > > and control whether the CDM will encode our PL tone or not? > > > > Another option is the CommSpec SS-64, which I have on hand. However, we > > cannot simply parallel the tone output into the pre-emphasized audio > input > > of the radio. I know that the radio could probably be programmed for no > > pre-emphasis, but I don't want to bypass limiting. > > > > Ideas or suggestions? Maybe someone knows a good location to inject the > > tone directly into the radio's modulator? > > > > Thank you, > > > > James Adkins, KB0NHX > > [EMAIL PROTECTED] <adkins.james%40gmail.com> > > > > > > > > > > > > -- > > James Adkins, KB0NHX > > > > District 1 Technical Field Engineer > > Troop A--Lee's Summit; Troop H--St. Joseph > > Missouri State Highway Patrol > > 504 SE Blue Parkway Lee's Summit, MO 64063 > > 816-622-0707 ext. 235 > > 417-840-5261 (Cell) > > > > "I'm James Adkins and I approve this message" > > > > ------------------------------------------- > Ken > > > -- James Adkins, KB0NHX District 1 Technical Field Engineer Troop A--Lee's Summit; Troop H--St. Joseph Missouri State Highway Patrol 504 SE Blue Parkway Lee's Summit, MO 64063 816-622-0707 ext. 235 417-840-5261 (Cell) "I'm James Adkins and I approve this message"
