U20440 Used Alpha Delta Delta-4 Coax Switch-Surge Protector

U20440 Used Alpha Delta Delta-4 Coax Switch-Surge Protector

Overall Condition: Used, clean, and in great physical and operational condition overall! Cosmetic Details: The gray painted metal desktop console presents cleanly with normal handling consistent with normal ham shack use. There are no major cosmetic flaws, cracks, or dents. Switch Mechanism & Faceplate: The large front rotary knob turns with positive, firm detents across all four switch positions and the center ground/common position. Faceplate graphics and the front ARC-PLUG ACCESS port are clean and intact. RF Connectors & Grounding: All five SO-239 UHF connectors (Common plus Ports 1–4) feature clean, bright threads and undamaged dielectric insulators. The rear heavy-duty copper grounding bus bar with three wing-nut grounding studs is solid and oxidation-free.

The Alpha Delta Delta-4 is a commercial-grade, heavy-duty 4-position RF coaxial switch engineered for amateur radio stations, communications centers, and laboratory benches. Built inside a robust cast metal cavity housing that provides superior cross-talk isolation (greater than 60 dB down at 30 MHz and 50 dB down at 450 MHz), it handles up to 1,500 Watts PEP through 30 MHz and up to 1,000 Watts PEP on VHF/UHF.

Equipped with Alpha Delta’s replaceable internal Arc-Plug gas tube surge protector cartridge (accessible directly from the front panel), the Delta-4 automatically grounds unselected antenna ports to protect connected receivers and transceivers against static buildup and nearby lightning surges. When switched to the center COM position, all connected antenna ports are completely disconnected from the radio and shunted directly to station ground.

Condition Breakdown

• General: Pre-owned, clean functional condition showing normal station use

• Enclosure & Mounting: Powder-coated gray angled desktop stand is sturdy with four secure non-slip rubber feet

• Rotary Selector: Heavy-duty pointer knob clicks positively into positions 1, 2, COM, 3, and 4

• Front Panel: Clean faceplate text, labeled port positions, and intact Arc-Plug access screw cap

• Coaxial Ports: Five clean, nickel-plated SO-239 connectors (1 Common input, 4 switched outputs) with straight mounting plates

• Grounding Hardware: Heavy copper strap grounding bus with three stainless-steel wing-nut terminals ensures low-impedance connection to earth ground

Key Features

• 4-Position RF Switching: Effortlessly switch one radio between four antennas, or one antenna between four transceivers

• High Power Capability: Rated to handle up to 1,500W PEP on HF (below 30 MHz) and 1,000W PEP on VHF/UHF bands

• Field-Replaceable Surge Protection: Features an internal Arc-Plug gas discharge cartridge accessible through the front panel for surge dissipation

• Automatic Inactive Port Grounding: Automatically grounds unused antenna ports while directing the active line to your equipment

• Center "All Grounded" Position: Switching to COM isolates and grounds all connected antenna feedlines during severe weather or station shutdown

• Heavy-Duty Cast Cavity Design: Precision micro-strip internal cavity maintains true 50-Ohm impedance and low insertion loss

What's Included

• Alpha Delta Delta-4 4-Position Coax Switch & Surge Protector Desktop Unit

Warranty

Comes with our 90-Day Warranty!

S/N: n/a

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