CDM to alert like a Minitor

cfdeng3 · Post by **cfdeng3** » Sat Feb 02, 2002 12:48 pm

I have a CDM 1550. I am trying to get the radio to beep with an alert when my FD sends out their tones similar to a minitor pager. They are plectron codes and I have all the info.

Can anyone help??

Thanks

Chris · Post by **Chris** » Sat Feb 02, 2002 1:25 pm

Not a problem, set up a quick call signalling system and set the rx squelch on a channel to the quick call system you set up. You do mention that you are using plectron codes which may be an issue since the HT/CDM series do not reliably decode above 2000 Hz.

jim · Post by **jim** » Sat Feb 02, 2002 2:36 pm

I program many HT1250s and have never had any luck getting them to decode the Plectron "chord" tones. Good luck!

cfdeng3 · Post by **cfdeng3** » Sat Feb 02, 2002 3:02 pm

Well I set up the quick call with 643 and 1036 and the tone went off and I got no alert tone?? Oh well...any other suggestions.

Chris · Post by **Chris** » Sat Feb 02, 2002 3:31 pm

Chord tones will usually work, IF you open a wav of the tone alert and find the frequency at which the tones that make up the chord mix. I use cool edit to create a waveform of the tone, and then analyze the tone using the frequency analysis feature of the program. Are you guys still use the old style LAFD chord tones. Do yourselves a favor and upgrade, the minitor III's don't do too well with these either.

Chris

gafd6913 · Post by **gafd6913** » Sat Feb 02, 2002 5:09 pm

If you need to generate tones, use a program called NCH Swift Sound. You can download it on http://www.download.com Just generate your tones, save them, then splice them together.

Will · Post by **Will** » Sat Feb 02, 2002 7:48 pm

I used to work on Plectron vs Moto QCII.
The Plectron timming can be a problem because it is faster than standard QCII timing.
The alert tone is generated by droping the paging transmitter for a split second and the receiver then generates the alert tone. Then the dispatcher s voice message.

jim · Post by **jim** » Sat Feb 02, 2002 9:18 pm

Well, I just programmed my HT1250 to a local department that gets called out all day long and I still can't get it to recognize them chord tones. I did use Cool Edit and get an average, but this didn't work either. Maybe this should be one of the features to add to "the radio we'd design."
I agree about updating to QCII, although this can get to be expensive. It may get to a point where you have to do it, as most modern radios won't properly decode chords.

Many of our local departments are using Plectron along with QCII tones. The Plectron chords are used for old equipment and the QCII activates any newer radios- and it's just a simple matter or reprogramming the console to do two sets of tones. The only drawback (if you could even call it that) is that it takes two sets of tones to dispatch you. It works great, however.