Overview

Hamplus AS-81S Antenna Switches

Hamplus AS-81S Antenna Switch is a high quality outdoor remote relay unit with eight antenna inputs and one common RF output. The AS-81S rectangular outdoor unit replaces the AS-81, the previous round enclosure model. It handles 4 kW PEP RF power on antennas with SWR under 1.7:1 across the RF spectrum from 0 to 60 MHz. The aluminum cabinet is painted white, especially developed for long term outdoor use. The coaxial connectors are the UHF type (SO-239). All unselected inputs are automatically connected to ground and all inputs are connected to ground when power is off.

The Hamplus AS-81S Antenna Switch is normally operated with a Hamplus Smart Controller MBD-8F, sold separately. However, it may be controlled with any automated or manual switching system that provides grounding port selection. A 9-conductor control cable is required. This switch is supplied with a short 9 ft. cable terminated to the DB25M for testing operation with a Hamplus MBD-8E or MBD-8F Smart Controller. This cable may be extended for remote installation outside, at the tower or other antenna cable termination point.

Hamplus AS-81S Antenna Switch Specifications:
- Frequency of operation: 0 to 60MHz
- Power allowed: 4,000 watts PEP SSB with S.W.R. equal or less than 1.7:1
- Insertion loss: Equal or less than 0.1dB
- Port Selection: Sink to ground, low side switching (Hamplus MBD-8F typical)
- Port Isolation: Equal or less than -58dB to 30MHz; less than -52db to 60MHz
- Relay Delay: Equal or less than 50ms
- Power Supply: 13.8 Vdc +/ - 20%; 70mA single port selected
- Control Cable: 9 conductors, 24 AWG or larger

Documentation