The repeater is uses a modified DB Products DB-420 vertically polarized omni directional antenna. The antenna is fed with 150 feet of 7/8 heliax and provides 9DBd gain. The antenna is mounted at the top of the tower which is 850 feet above sea level, or about 150 above ground level. |
For filtering, the repeater uses a TX-RX Systems 28-66-02B var-notch duplexer. There is also a TX/RX Systems 11-70-02 dual cavity band pass filter, and an 8 pole DCI bandpass filter, on the receive side of the duplexer. |
The repeater uses an ARR P432VDG pre-amplifier repackaged in a Hammond die-cast box. |
The repeater uses a 100w Comark Class-A UHF amplifier. This amplifier was factory retuned for the 70cm band. It requires 28vdc and draws a constant 12 amps. |
The complete repeater |
This view shows the back of the repeater cabinet |
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Amplifier, duplexer, 28v power supply for the amplifier, DCI bandpass filter, repeater controller, 70cm repeater module |
This view shows the upper half of the back side of the repeater cabinet, including the TX/RX bandpass cavities |
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ID-RP2C repeater controller, ID-RP4000V 70cm repeater, pre-amp power supply, repeater power supply, towercam monitor and controllers, gateway server, router, UPS, video server |
This view shows the back of the lower half of the repeater cabinet |
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Comark UHF amplifier |
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Comark UHF amplifier internals |
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Comark UHF amplifier |
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Kevin and Steve installing the tower camera. Antennas from left to right are:
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WIFI link antenna |
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Tower camera internals |