Batboard

Thanks to all the Batlab'ers for the help. I got my repeater up and running . Now to find a mountain to put it on. I don't have receive audio yet, but, like always I found the info here. One last question. What is it with the m100 series radios that you can't use it as a receiver? And for those of you have/are using them as receivers, how'd you do it? I have learned alot and want to thank all of you out there for the info. Can't wait for the next project.

Hello Bill,

Here's what you should be looking for in the M100 Receiver. Open your schematic, locate the receiver's Discriminator Output circuitry and solder in a small diameter coaxial audio cable bringing it out of the radio and connecting it to the controller or RICK that feeds the Exciter's Audio Input of the XMTR.

The receiver's Discriminator Audio Output is Flat response which you are looking for to feed the Audio Input of the Exciter. The XMTR Exciter Pre-Emphasizes the Tx audio meeting the FCC Rules and a typical two-way radio receiver De-emphasis the recovered audio and it sounds relatively flat response between 300 Hz and 3000 Hz.

If you were to sample or take the De-emphsized recovered audio from the speaker and feed it into the XMTR's Pre-Emphasized Exciter, the Tx audio would come out flat over the air and then be De-Emphasized in the Mobiles and Portable sounding like garbage audio.

I looked all over my house for the M100 service manual but could not find it, I'll stumble over it in 6 months and wonder why I needed it.

Dan

Using the Maxtrac/RadiusM100 mobile as a repeater receiver:

One problem is the antenna switch diodes in the PA, they need to be by-passed. Or, like we do, the Pa is removed from the radio and the antenna cable is run directly to the Duplexer filters.

And when running the RICK, the RX audio gets distorted by the circuits in the RICK.