Modat Timing

Dale Earnhardt · Post by **Dale Earnhardt** » Thu Aug 22, 2002 3:49 pm

Hey everybody

Does anybody know the Timing and the freq of Modat Signalling, me and couple of friends trying somethign with some other radios to decode the Modat, because its a 5 tone, we are trying to find some info so we can program it in the radio, and see if it can decode modat, would be nice wouldnt it? lol, there will be acutally use for modat now!!!!

1 Adam 12 · Post by **1 Adam 12** » Fri Aug 23, 2002 10:08 am

Its been a long time... But from the MX days, I believe it was seven 40-millisecond outputs and the time basing was 246.65KHZ. I can dig up the old manuals if you need more. This was off the fly and its been 6-7 years since I've seen an MX with Modat.

abbylind · Post by **abbylind** » Fri Aug 23, 2002 11:22 am

If I remember right it was a change in a resisitor value which changes the delay on the MODAT board. Ive got a Systems 90 MODAT with duress but I cant find the dang manual

Fowler

Dale Earnhardt · Post by **Dale Earnhardt** » Fri Aug 23, 2002 12:26 pm

Hey 1 adam 12,

That would help alot if you could get the manula, we are all tryin to figure this thing out lol, its to complicated

We are tying to put these timing and freq on these new Icom mobile that has a 5 tone board for decode and encodeing

Dale Earnhardt · Post by **Dale Earnhardt** » Fri Aug 23, 2002 12:32 pm

Well this is the thing am looking for, or what the RSS on this icom ask for

Right now we are on a standard EIA signalling, so we are gonna change some things around or, just go to User tone,

And what it ask are
Encode, Decode Low, and Decode High

Some of the example they give us was
Encode Decode Low Decode High
1981.0 1921.6 2040.4

YOu guys make out any of these thing am putting, cause I sure dont to much lol

1 Adam 12 · Post by **1 Adam 12** » Sat Aug 24, 2002 7:04 am

I am looking for one of the actual Modat manuals this afternoon, but I did find in the dusty MX manual that the First 4 tones are system tones and the last 3 actually represent the unit ID. Will get back to you as I am cleaning out storage area. I know I have something that was about 20 pages on MODAT...

Dale Earnhardt · Post by **Dale Earnhardt** » Sun Aug 25, 2002 12:47 am

Humm, intresting, I thought so, cause I was like if its a 7 tone modat, and when you put in your ID of only 3 ID, it sure dosent sound like it lol