Physical Radio Systems of the WVRA 

last update 07/29/2007

147.135/146.865 repeater system - satellite receivers/multicast transmitters

PL 114.8 (2A)

MOSINEE HILL

The satellite receiver is linked back to the main site at FOX 55 (Hewitt) using a UHF Motorola Maxtrac 100 transmit radio that has VHF GE/Ericsson MDX radio connected to it receiving on 147.735.  The VHF receive radio is connected to a TX/RX 2 port power divider and then runs through a Motorola Micor receive preamp.  The preamp is connected to a Wacom duplexer and that is connected to the 7/8" hardline.  The hardline runs up the tower to a Celwave PD220 omni antenna at 150'.  The second port of the TX/RX power splitter is connected to the receiver for the 147.060 repeater.  The UHF transmitter is run through a Motorola pass/reject duplexer and the output of the duplexer is connected to Belden 9914 coax.  The coax runs up the tower to 50' and connects to a 3 element UHF yagi pointing toward the Hewitt tower.  

The multicast transmitter starts with receiving the UHF signal from the voter at the Hewitt tower by using the same UHF yagi and line as the satellite receiver uses.  The signal splits at the Motorola duplexer and goes to the UHF Motorola Radius M10 receiver.  This radio is connected to a VHF Motorola Radius M216 through an interface circuit which controls the hang time and ID on the 2M transmitter.  The 2M transmitter has the power turned down to approximately 1 watt and is feed into a 6db attenuator and then to the input of a GE Mastr II power amp.  The output of the PA is run first through run a TX/RX isolator/circulator and second harmonic filter and then through 2 TX/RX band pass cavities and then to the 7/8" hardline.  The hardline runs up the tower and connects to a Celwave PD340 omni antenna located at 90' on the north side of the tower.  After all the filtering, we get approximately 65 watts out to the antenna.

Other amateur repeaters at this site include the 147.060, 443.750, and 144.390 APRS.  There are also GMRS repeaters on 462.550 and 462.675.

There is a generator at this site to provide emergency power.