Alpha Delta DELTA-4B
4-way Coaxial Switch UHF SO239 Connectors (1500 Watt CW)
The excellent quality of this device is characterized by a die-cast enclosure with a constant impedance microstrip cavity for UHF. Lossy wafer switches are not used, but a solid ball-bearing system. No uncertainty about which position has been selected. Unused positions are automatically grounded to reduce noise interaction and potential discharges. The famous Alpha Delta Arc-Plug™ Cartridge protects the active position. The antenna, whether in or out, is always protected! The Arc Plug is easily accessible from the front panel so the switch can be mounted on any surface. Both models handle full legal power.
VSWR is less than 1.2:1 up to 150 MHz, and less than 1.5:1 at 500 MHz for the DELTA series with UHF connectors.
Models with N-type connectors have a VSWR less than 1.2:1 up to 500 MHz and less than 1.5:1 at 1.2 GHz.
Switches with SO-239 (UHF) are rated for 1500 watts CW/FM up to 30 MHz and 1000 watts from 30 to 450 MHz, assuming a VSWR less than 2:1. Higher VSWR values at full power could affect the ARC-PLUG cartridge. Isolation of 60 dB up to 450 MHz, typically 70 dB below 30 MHz.
Switches with N-type connectors are rated for power up to 1500 watts CW/FM up to 150 MHz, 1000 watts from 150 to 500 MHz, and 800 watts from 500 MHz to 1.2 GHz. NOTE: 1.2 GHz, not 1.3 GHz. Isolation of 60 dB up to 500 MHz and 50 dB from 500 MHz to 1.2 GHz. Assuming a VSWR not greater than 2:1.
All models have such low losses that the interconnecting cables usually present more losses than the switches themselves.
