DELTA - 4B Series
LIGHTNING SURGE PROTECTED
4 POSITION RF COAX SWITCH
WITH FIELD-REPLACEABLE SURGE PROTECTOR PILL
NOTE: SAME DATA APPLIES FOR DELTA-2
TWO POSITION SWITCH
--SPECIFICATIONS--
| POWER RATING- 1500 WATTS RF |
IMPEDANCE- 50 OHMS CONNECTORS- TYPE SO-239: DELTA-4 |
| SWITCH POSTIONS |
Four, two either side of the “common” center, connector. |
| LIGHTING SURGE PROTECTION |
Alpha Delta Model D-4 internally mounted, field-replaceable ceramic
gas tube Arc-Plug Cartridge Pill. |
| SPECIAL SWITCHING FUNCTIONS |
When the knob points to the center (ground) switch position, all
antenna circuits are internally disconnected and grounded. When the
knob is in an active position, the unused antenna ports are grounded.
The active position circuit is continuously protected by the Model D-4
Arc-Plug Cartridge Pill. |
| GROUNDING REQUIREMENTS |
A separate, external ground wire must be used from one set of user
supplied mounting hardware (through either thru-hole on the base
plate) to the station ground system. (Not the equipment chassis.) The
Arc-Plug Cartridge Pill will not operate without a good ground. Note:
Paint should be removed at point of ground hardware connection to
base plate. It is also good practice to ground the coax shield at point of
entry to the building. |
| ELECTRICAL SPECIFICATIONS |
Nominal (S0-239 CONNECTORS)
| |
VSWR |
dB Loss |
dB Isolation |
| 30 MHz |
<1.1:1 |
.1dB |
>60dB |
| 150 MHz |
<1.3:1 |
.15dB |
>50dB |
| 450 MHz |
<1.4:1 |
.5dB |
50dB |
Model DELTA-4/N is rated through 1.3 GHz |
PRICES & SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
These devices are not intended to protect equipment, personnel or structures from the effects of a direct lightning strike as these events are unpredictable
in strength and vary widely in severity, possibly well above our surge handling specifications. However, these devices are designed to
provide effective equipment protection from antenna induced atmospheric surge voltages resulting from electrical static voltage discharges and
nearby lightning induced voltage discharges, within the ratings of these devices.
|
ARC-PLUG@ CARTRIDGE REPLACEMENT
Additional 0-4 Arc-Plug Cartridge Pills are available from Alpha Delta or your dealer at a nominal cost.
Replacement in the field is quite easy, and the only tool required is a screwdriver.
Should a severe lightning hit occur, the ceramic gas tube Arc-Plug Cartridge Pill will short to ground
protecting your equipment. The pill will remain shorted however (unlike its recovery to open circuit
condition after a less severe hit or transient) and must be removed or replaced in order to continue
operation. If replacement pill is not immediately available you can continue operation (without lightning
transient protection) by removing the shorted pill from the switch until you obtain its replacement.
To replace the pill, use a screwdriver to remove the front panel access screw by turning it counter clockwise.
Then, turn the switch upside down until the Arc-Plup Cartridge Pill drops out of the access hole.
Now, turn the switch right side up, drop the new Arc-Piup Cartridge Pill into the access hole. (Make sure
the Pilt is lying with its metal surface up) then, insert the set screw and tighten it in a clockwise direction
with the screwdriver until finger tight. (CAUTION-Over tightening of the set screw can damage the Arc-
Plug Pill.)
Note: The Alpha Delta Model D-4 Arc Plug© Cartridge Pill is designed to reduce the hazards of lightning induced, or other
high voltage induced surges. This device, however, will not prevent fire or damage caused by direct lightning strike to an
antenna. power lines or other structure.
Caution: Do Not change switch positians while RF is applied; or when the back cover is removed. This can cause damage
to the switch contacts and such damage will not'be covered by our warranty.
APPLICATION INFORMATION
The model Delta-4 switch can be used in several different applications, depending upon the installation
configuration.
- A. Muftiple Antenna, Single RCVR/XCVR Application - Connect the "jumper" coax from
the RCVR/XCVR to the 'common" connector on the switch. Connect antennas dummy
load to your choice of positions 1,2,3, or 4 on the switch.
- B. Multiple RCVR, Single Antenna Application- Connect the single antenna coax to the
"common position on the switch. Connect RCVR jumpers to your choice of positions
1,2,3, or 4 on the switch.
Note: Switch specifications, including co-channel isolation in dB, are guaranteed only when using properly installed 50 ohm
coaxial cable. Single wire" jurnpers" or antenna feeds do not provide proper isolation or VSWR characteristics. For transmitting,
any model must be placed at a point in the coax line where VSWR does not exceed 2:l to prevent high RF voltages
from triggering the Arc-Plug Pill.
