Filters
Unified Microsystems Band Decoders and Antenna Relay Boards
Unified Microsystems Band Decoder/Antenna Selector Modules
Unified Microsystems Band Decoder/Antenna Selector Modules are important components if you are building your own automatic antenna switching system. These modules include the switching logic and relay drivers to easily interface between your Elecraft K3, Yaesu radio or computer, and the antenna switches. Use the BCD-14 to decode band switching for up to 14 relays. The BCD-14 modules decode the band select signals from your radio or computer to automatically select the proper antenna or band pass filter for your chosen band of operation. The module's inputs are optically isolated to provide maximum isolation between your radio or computer and the antenna switching system. Module outputs are grounding-type open-collector relay drivers. If the antenna or filter switch you wish to control requires high-side drivers, add the optional HSD-9 module. One output per band will be active, depending on the input signals. However, outputs may be wired to select a single antenna for multiple bands. For example, one relay may be used to select your tri-bander. With two jumpers installed on the BCD-14, that relay will be activated whenever your radio is set to any one of that antenna's three bands. The BCD-14 covers all bands, 160-10 meters, including the WARC bands plus 6 meters, 2 meters, and 440 MHz. The BCD-14 boards have corner mounting holes, but hardware, enclosures and antenna relays are user supplied. Why risk transmitting on the wrong antenna or put yourself in the position to require manual selection at all? Use this economical Unified Microsystems Band Decoder/Antenna Selector Module from DX Engineering, to build your automated antenna selector system!
( 6 )
$23.99
Unified Microsystems High-Side Driver Modules
Unified Microsystems High-Side Driver Modules, (HSD-9), are the easy way to adapt a BCD-10, BCD-14, or other low-side band switching decoder to a high-side antenna or filter switch. They provide nine channels of high-side relay control when used with low-side drivers. Antenna switches are always either high-side or low-side switched. There are advantages to each, but it's a pain if your decoder and switch are different types. These HSD-9s are a convenient way to convert the BCD series or other decoders to high-side switching. Simply place an HSD-9 between the BCD-10 and your switch. Specifications: * Nine channels of control when used with BCD-10 selector modules * Board dimensions: 2.4 in. by 1.9 in. * Maximum voltage: 24V DC * Maximum current: 1A Note: Use of an HSD-9 REQUIRES a companion BCD-10 or BCD-14 Band Decoder/Antenna Selector Module or other low-side band-switching decoder. These high-side driver modules are an important component if you are you building your own automatic antenna switching system and employing switches requiring high-side drive. Use one of these Unified Microsystems High-Side Driver Modules, now available from DX Engineering, to convert your relay driver!
( 1 )
$14.99