Joe, If you want to play with your EMS repeater, you'll need two Motorola manuals: 6881015E70, which covers the basic UHF Micor mobile radio, and 6881029E45, which is the EMS repeater supplement. Both of these manuals are still available from Motorola Parts, for about $92 and $30, respectively.
The duplexer is an oddball design using four helical resonators in the TX side and three helical resonators in the RX side. Although it is designed for a 5 MHz split, it probably will not tune down into the 70 cm band. The specs for the QFE1024A duplexer state that both sides should attenuate the opposite frequency by at least 65 dB, and should have an insertion loss no greater than 1.5 dB. The repeater is designed to transmit with 30 watts of power on the eight EMS channels: 468.000, 468.025, 468.050, 468.075. 468.100, 468.125, 468.150, and 468.175 MHz. The eight receive channels are exactly 5 MHz lower. An optional auxiliary receiver allows reception of 458.025, 458.075, 458.125, and 458.175 MHz. (Those frequencies don't look right, but that's what is printed in the EMS manual.) The are a number of extra cards for processing medical telemetry and controlling the repeater functions. 73, Eric Lemmon WB6FLY ----- Original Message ----- From: "Joe" <k1ike_m...@snet.net <mailto:k1ike_mail%40snet.net> > To: <Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> > Sent: Saturday, October 17, 2009 6:49 PM Subject: [Repeater-Builder] Emergency Medical Systems Duplex / Repeater UHF Mobile Radio Model Q2203A <snip> > > I just found an orphan EMS model Q2033A mobile at my door. No cables or > head, just the transceiver and receiver boxes. These were used on the > local ambulance and were full duplex, plus repeater function. Is there > any use for these on the ham bands? The duplexer looks to be too wide > banded for ham use. I remember playing with one of these duplexers > years ago. > > Looks like I just have Micor spare parts? > > 73, Joe, K1ike
