The Current 435 repeater rack, top to bottom:

• Internet remote controlled AC Power switch.
• Control / link radios.
• Radio mount (unused)
• Internet stack: router, firewall, switch, VoIP interfaces.
• Samlex 1KW 120v AC power inverter for battery backup.
• Linux computer; 8-core; VoIP interfaces, audio logging, analysis, finger printing.
• Dual RF TX circulator.
• 2m repeater based on a GE Mastr (Custom).
• RLC Club Deluxe II 6-port repeater controller.
• Samlex 100A 12V power supply.
• Motorola timebase (unused).
• 2m TX Henry RF amplifier.
• 2m RX Preamp.
• 2m duplexers and band pass cavities.
• Batteries for inverter backup power.

More Detail on the Custom GE Repeater

The core repeater is a rebuilt GE with RX helical resonator front-end.  The repeater is based on a GE Mastr II RX shelf converted to uMASTR II configuration with TX based on an Mastr Exec II PA frame gutted & rebuilt with a modern FET-brick and reworked crystals. We have a custom front panel, wiring harness and connectors compatible for our controller, finger printer, etc. The new TX FET-brick is cleaner and more efficient than the original class C PA; and should last for years at 100% duty cycle.

We stayed with the GE dual-hysteresis squelch and CTCSS filter. They’re amazing! CTCSS is completely removed, but recovered audio is otherwise unchanged. Thus a fairly flat audio is realized. The transmitter exciter includes its own special audio input for flat-below-4KHz TX audio. No limiter or clipper is present, or pre-emphasis; only the factory adjacent-channel splatter filter. Within the bandwidth limits of our 2-Meter channel, this is the ideal setup for high-fidelity audio.

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