Alpha Delta DELTA-4B 4-way, UHF
Manual 4-way coaxial switch with UHF SO-239 connectors, 1500 W CW, unused positions grounded, Arc-Plug
The Alpha Delta DELTA-4B is a 4-way coaxial switch with UHF SO-239 connectors, rated for 1500 W CW. The die-cast body forms a constant-impedance microstrip cavity.
Product description
Instead of lossy wafer switches it uses a robust ball-bearing detent mechanism: the selected position is always clear. Unused positions are grounded automatically, reducing noise interaction and static discharges.
The Alpha Delta Arc-Plug cartridge protects the position in use, whether the antenna is on line or switched out. It is accessible from the front panel, so the switch can be mounted on any surface.
Losses are so low that the connecting cables usually lose more than the switch itself.
Key features
Full legal power.
Unused outputs are grounded.
Discharge protection, replaceable from the front.
Caution
Power ratings assume an SWR no higher than 2:1; at full power, higher SWR may trigger the Arc-Plug cartridge.
Technical specifications
| Ways | 4 |
| Connectors | UHF SO-239 |
| Impedance | 50 Ω |
| Power | 1500 W CW/FM up to 30 MHz · 1000 W 30–450 MHz |
| SWR | < 1.2:1 up to 150 MHz · < 1.5:1 at 500 MHz |
| Isolation | 60 dB up to 450 MHz, typically 70 dB below 30 MHz |
| Insertion loss | < 0.1 dB at 30 MHz · < 0.15 dB at 150 MHz · < 0.5 dB at 450 MHz |
| Protection | Arc-Plug cartridge, unused positions grounded |
HamRadioShop | Coaxial switches
