DX Engineering Amplifier Keying Interfaces

DX Engineering KD9SV Keying Relay

DX Engineering KD9SV Keying Relay, DXE-SV-KR, is a high speed Solid State interface designed to protect transceiver keying circuits from potential damage by amplifier relays. Transceiver low voltage keying circuits handle only a few milliamperes (mA), but some "modern" amplifier relays require over 150 mA at 12 VDC. High voltage and high current amplifier keying relays were common in amplifiers made between 1950 and 1975. The DXE-SV-KR can safely key almost all DC amplifier relays, including older relays and keying inputs that operate at high voltage, typically -100 VDC or +110 VDC. Inspired by the original KD9SV Keying Relay, the DXE-SV-KR quickly and silently does the work of a 6-pin normally open (N.O.) Double Pole Single Throw (DPST) relay. It provides two completely isolated ground independent PTT Outputs, each capable of handling up to +/- 450VDC at up to 500mA. The DXE-SV-KR optically isolated PTT Input only requires 2mA at 13.8VDC to key, so it is safe for any transceiver's amplifier keying circuit or any other 'ground-on- transmit' PTT keying accessory. Built in a convenient enclosure with RCA phono jacks, the DXE-SV-KR is also QSK capable for keying any amplifier that supports high speed CW keying, typically a Solid State amplifier (or specially equipped tube amplifier) with a high-speed circuit for "Key In" PTT. The DXE-SV-KR may also be used to isolate a straight key or a Solid State electronic keyer connection to any CW key input. It can provide crucial protection and safety on high voltage CW key jacks and circuits common on old tube-type transmitters and transceivers. The DXE-SV-KR Keying Relay's high speed capability also provides relay debouncing, or it can be used as a remote high-voltage DC switch. The DXE-SV-KR operates on 13.8VDC to an input 2.1mm DC connector. A mating 2.1mm plug and wire are included. The DXE-SV-KR features standard RCA phono female connectors for ground-on-transmit Input and Output ports and is compatible with almost every transceiver or transmitter and amplifier combination. RCA phono patch cables are sold separately. The DX Engineering KD9SV Keying Relay is an uncomplicated way to ensure that your sensitive transceiver or electronic keying circuit is isolated and protected. CAUTION: DO NOT connect the DXE-SV-KR to AC voltage relays in antique amplifiers, typically 110VAC. See instructions. Except for AC switching, the DXE-SV-KR replaces the Ameritron ARB-704.

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