Jeff Weinberg, W8CQ

Your World-Wide Source For Amateur Radio Amplifier Parts & Upgrade Kits

Your World-Wide Source For Amateur Radio Amplifier Parts & Upgrade Kits

Multi-Key v2.4 Multi-Function Amplifier Keying Interface




The Harbach Electronics, LLC Multi-Key is a multi-function external device designed for the safe interface of modern transceivers and RF amplifiers.  For those that prefer an external interface to those that mount inside the amplifier, such as the SK-220 or SK-201 for the Heathkit SB-220 and SB-201 series of amplifiers, this kit fits the bill!  You can now interface any amateur transceiver with any amplifier safely and quickly.  The Multi-Key features 2 solid state relays capable of switching loads of 200 peak volts DC or AC at 250mA of current.  It also has 2 accessory jacks for control of other devices, such as an ON-AIR sign or a Dow-Key relay.  The possible uses for the accessory connections are endless!  The main PLA140 outputs can safely switch up to 400V and the accessory ground-isolated outputs can safely switch up to 220VDC or 250VAC at 3A of current.  NOTE:  Due to the length of the instruction manual for this kit, printed instructions are not sent with the kit.  You may download a PDF version from the DOWNLOADS section of the website complete with detailed step-by-step assembly/installation, testing and user instructions.

Additional information

Weight 0.71 lbs
Dimensions 5.5 × 5.5 × 2 in