6 Meter Radio Project BINGO!
fgentges at mindspring.com
Thu Nov 29 19:34:57 CST 2007
My second call to Midland ended up with one of the techs who found a
second manual to go with the first one. This one was ordered and
arrived today. I now have a pretty complete set of manuals for the
Midland Syntech-II 70-0520A/B/C radios.
We have not gotten the manuals for the other radios that Mike has gotten
This manual has the key information we need to add on a data link
feature. It is modulated with a VCO for the FM so direct FSK should be
quite feasible. Likewise, the FM is detected with a Motorola MC3357
Narrowband FM IF chip. The discriminator looks to be DC coupled to the
audio output. This looks very promising.
I will have my copy at Tacos on Saturday so anyone can look them over.
We need to start looking at how we will modify and test some radios now.
More information about the Tacos