maxtrac 300 uhf DPL very loud

FF/EMT/KC2NFB · Post by **FF/EMT/KC2NFB** » Mon Jul 31, 2006 5:39 pm

im using DPL 754 on a maxtrac 300 uhf and its very noticable in the background. how do you turn it down?

thanks

kcbooboo · Post by **kcbooboo** » Mon Jul 31, 2006 10:48 pm

Usually you shouldn't hear DPL at all. What are you using for a receiver? Give us a few more details.

The radio's deviation can be adjusted using the appropriate software package, but you should have a deviation monitor available as well as some other common two-way radio test equipment to properly set it up.

Bob M.

FF/EMT/KC2NFB · Post by **FF/EMT/KC2NFB** » Tue Aug 01, 2006 5:23 am

im just using a maxtrac simplex. when i key up the maxtrac and listen with a portable its there. i dont want to say is VERY loud but you can hear it on a dead key.

kcbooboo · Post by **kcbooboo** » Tue Aug 01, 2006 7:03 am

If the portable is setup for PL/DPL receive, it should filter out all the PL/DPL. If not, you might hear it, but even so it should barely be audible. DPL runs at a very low data rate, and the resulting audio tone would be below 130 Hz or so. You might be hearing harmonics or distortion coming through on your portable, especially if you turn it all the way up.

On 5 kHz deviation systems, the PL usually comes out around 800 Hz deviation. DPL would be about the same. The valid range is 600 to 1000 Hz deviation on tone-coded squelch systems. You can't adjust the PL/DPL level independent of the main deviation on a MaxTrac, so if the PL/DPL is over-deviating, so is the main audio.

It takes only a few minutes to accurately test and setup the deviation on a MaxTrac if you have the proper test gear and program.

Bob M.