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Unified Microsystems RAS-4 Receive Antenna Switch
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
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$124.95
Unified Microsystems ML-6 Replacement LED Lamp boards
Unified Microsystems ML-6 Replacement LED Lamp boards use reliable LEDs to replace the hard-to-find incandescent lamp used to illuminate the meter in Hy-gain™ and CDE Ham-M type control boxes. Six white LEDs provide longer life, even illumination and adjustable brightness to achieve the perfect lighting level for your shack. The ML-6 is easy to install. Peel the backing paper off the Velcro™ tape and press the circuit board on the top of the meter, solder the two wires to the old lamp holder, adjust the brightness and you are done!
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$12.95
Unified Microsystems SCI-6 PC Sound Card Interface Kits
Unified Microsystems SCI-6 PC Sound Card Interface Kits are an affordable option to get you on PSK31, RTTY, WSJT, EchoLink, and other exciting digital modes by utilizing your PC's internal sound card. These SCI-6 interfaces are your ticket to cutting-edge digital communications developments. Their design incorporates transformer isolation on both transmit and receive audio. The PTT circuit interfaces to a PC serial port through an opto-isolator to generate automatic transmit/receive control. Since the computer PTT-out pulls high, these SCI-6 interfaces require no external power source. These SCI-6 kits also make a great club project! Give your members some kit-building experience, as well as an introduction to new modes. These kits contain a high-quality, double-sided circuit board with a solder mask and component legends for easy assembly. Unlike other low-cost kits, a machined case is included. For convenience, the cables to your PC's sound card are included. You supply the cables to your particular model of radio. RCA phono connectors make it easy for you to customize the remainder of the connections to your radio. Software for many of the digital modes can be downloaded from the Internet at no cost. When using a PC sound card for digital modes, you may inadvertently transmit sounds generated by your operating system. PC-based sounds can usually be eliminated by a settings change. Please see our images for an example of how to eliminate PC sounds. SCI-6 features: * TX audio: transformer isolation * RX audio: transformer isolation * PTT: optical isolation * Power requirements: None * Size: 2.5 in. wide, by 2.5 in. deep, by 1.0 in. high Note: For additional product information, please look at the files under the "Documentation" tab. Order one of these Unified Microsystems SCI-6 PC Sound Card Interface Kits from DX Engineering and get on the air NOW!
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$29.95