Filters
Unified Microsystems RAS-4 Receive Antenna Switch
2 Customer Reviews
Unified Microsystems RAS-4 Receive Antenna Switch is an outdoor capable remote relay unit that allows the operator to select up to four antennas. Receive only anten
Unified Microsystems RAS-4 Receive Antenna Switch is an outdoor capable remote relay unit that allows the operator to select up to four antennas. Receive only antennas are critical for success on the low bands. Due to the wavelengths of the low bands, these antennas cannot be rotated. Several very effective receive only antennas are mono-directional or bi-directional, including Beverage, Reversible Beverage, Beverage on the Ground (BOG), Reversible Beverage on the Ground (RBOG) and many others,. Therefore, a high quality, low noise four port receive antenna switch is required to cover all of the directions with multi
Unified Microsystems RAS-4 Receive Antenna Switch is an outdoor capable remote relay unit that allows the operator to select up to four antennas. Receive only antennas are critical for success on the low bands. Due to the wavelengths of the low bands, these antennas cannot be rotated. Several very effective receive only antennas are mono-directional or bi-directional, including Beverage, Reversible Beverage, Beverage on the Ground (BOG), Reversible Beverage on the Ground (RBOG) and many others,. Therefore, a high quality, low noise four port receive antenna switch is required to cover all of the directions with multiple antennas.
Common mode noise pick up can ruin the performance of receive antenna systems, so the RAS-4 isolates both the center conductor and shield of unselected ports. An internal bifilar ferrite choke further reduces common mode currents. This unit features female F connectors for RG6U coax with male F connectors, the standard field-serviceable coaxial cable assemblies for receive antenna systems.
A very important requirement for dual feedline Reversible Beverage and RBOG antennas is provided by the RAS-4. By default, unselected ports are terminated for 75 ohms. The user can change to 50 ohm, open circuit, or center conductor-shield short by soldering wire jumpers. The RAS-4 is housed in a NEMA rated enclosure with a gasket lid. A cable gland seals the control cable entry. The internal circuit board has a conformal coating for additional protection. The RAS-4 can be mounted outdoors, with the enclosure flanges or with the included L bracket for mounting to a pole or post.
The RAS-4 Receive Antenna Switch is a receive-only relay unit that cannot be used for transmitting antennas. The required in-shack control console switch is not included. The RAS-4 will work with a commercial or a simple home brewed, positive 12V One-of-Four switch. Choose from DX Engineering, EA4TX and others for manual or automated switching.
Unified Microsystems RAS-4 Receive Antenna Switch Specifications
Antenna Selection: 4 receive antennas to 1 main feedline
Dimensions: Approx. 4.5 x 3.5 x 3.25 in. (11.4 x 8.9 x 8.3 cm), not including the bracket.
Connector type: F (5 total)
Unselected port termination: 75 ohm default; 50 ohm; open; shorted. Wire jumper selectable
VSWR: < 1.5:1 from 100 kHz to 20 MHz
Insertion loss: < 0.4dB from 100 kHz to 20 MHz
Port to Port Isolation: > 45dB from 100 kHz to 20 MHz
Control Cable: 3 wire plus ground (4 total conductors), Not included
Switch Controller: 12 to 14 Vdc, Not included
Common mode noise pick up can ruin the performance of receive antenna systems, so the RAS-4 isolates both the center conductor and shield of unselected ports. An internal bifilar ferrite choke further reduces common mode currents. This unit features female F connectors for RG6U coax with male F connectors, the standard field-serviceable coaxial cable assemblies for receive antenna systems.
A very important requirement for dual feedline Reversible Beverage and RBOG antennas is provided by the RAS-4. By default, unselected ports are terminated for 75 ohms. The user can change to 50 ohm, open circuit, or center conductor-shield short by soldering wire jumpers. The RAS-4 is housed in a NEMA rated enclosure with a gasket lid. A cable gland seals the control cable entry. The internal circuit board has a conformal coating for additional protection. The RAS-4 can be mounted outdoors, with the enclosure flanges or with the included L bracket for mounting to a pole or post.
The RAS-4 Receive Antenna Switch is a receive-only relay unit that cannot be used for transmitting antennas. The required in-shack control console switch is not included. The RAS-4 will work with a commercial or a simple home brewed, positive 12V One-of-Four switch. Choose from DX Engineering, EA4TX and others for manual or automated switching.
Unified Microsystems RAS-4 Receive Antenna Switch Specifications
Antenna Selection: 4 receive antennas to 1 main feedline
Dimensions: Approx. 4.5 x 3.5 x 3.25 in. (11.4 x 8.9 x 8.3 cm), not including the bracket.
Connector type: F (5 total)
Unselected port termination: 75 ohm default; 50 ohm; open; shorted. Wire jumper selectable
VSWR: < 1.5:1 from 100 kHz to 20 MHz
Insertion loss: < 0.4dB from 100 kHz to 20 MHz
Port to Port Isolation: > 45dB from 100 kHz to 20 MHz
Control Cable: 3 wire plus ground (4 total conductors), Not included
Switch Controller: 12 to 14 Vdc, Not included
Receive Antenna Switch, for up to Four Antennas Using RG-6 Coax, Type F female, Req. 1 of 3 13.8VDC (DXE-CC-4), Each
Part Number: UMS-RAS-4
Estimated Ship Date: Tomorrow
Estimated Ship Date: Tomorrow