In a message dated 4/25/2007 2:21:27 PM Central Daylight Time, [EMAIL PROTECTED] writes:
Took a couple of antique GE Phoenix SX mobile radios. Programmed for > 442.0/ 447.0. With TOT. Carrier Squelch - Took Receiver Un Squelched > lead to PTT thru a one transistor keying transistor. > > Took VOL / SQ Hi and ran it thru a single common emitter stage - > bipolar amp and applied the collector output to the high side of the > TX deviation control and set for +/- 1 Khz TXD. Did have to bypass > the emitter leg of the single stage amp and wallah - DSTAR Repeater - > sort of. Maybe P25 repeater too? Simple - really do need to > regenerate the data signal and key on detected data with a CCD chip to > give the preamble tone time to get thru. Excellent work Mr. Bosshard. This is one of the things that I've wanted to explore with D-Star but haven't had the time. This approach also works for most other modes based on FM (9600 BPS packet, Motorola DES, etc.). Truly, to support multiple modes or technologies, we need only look at the world of linear transponders for a clue -- there's really not much of a point in having too much of a radio there when you're just repeating in the input RF. -- Kris Kirby <[EMAIL PROTECTED] (mailto:[EMAIL PROTECTED]) > This is commonly known as a transparent repeater and the well known Maxtrac version works well with any of the common digital voice protocols except 12KB securenet (DES,DVP) which is definitely not legal on the ham bands anyway. However you loose the benifit of data regeneration and error correction. Chris N9LLO ************************************** See what's free at http://www.aol.com.
