Most amplifiers use RCA phono jacks for both keying line and ALC line. One cable (with relay) for amplifier keying, and the other (directly connected) for ALC. Cut the phono plugs off one end and wire them to the radio’s accessory jack and relay. The audio cable is the typical stereo RCA phono plug cable, 3 to 6 feet as desired. You can build an interface for $10-$30 all you need is an old stereo audio patch cable and a small relay. If that’s your goal, then by all means buy one, but if you’d rather roll your own, please continue reading. They are plug-n-play, so you don’t have to look up specs for your radio and amp or do any designing. The problem is that they cost too much! Why? Because they are built to be compatible with a wide range of radios and amplifiers, and thus have a high parts count. ![]() Other companies make amps that are much lower cost-per-watt, and just as good, but the keying circuit is generic, with interfaces provided at extra cost. Of course, radio manufacturers sell (very expensive) amps that will plug right in to their radios, but most hams opt for less expensive options. Each manufacturer uses their own voltage and current for this simple operation. The problem is that there are no standards for connecting the keying circuits of transceivers and amplifiers. You order a nice amplifier, only to discover you also need an “interface” to connect the radio and the amp. So you got your nifty HF transceiver and now it’s time to move up to the big leagues and add some power to your signal. New! 7/21 I built a full breakout box for the 7100’s accessory jack. Home » Ham Radio » 2018 Projects » Amp Interface ![]() Dough Types, Procedures, and Properties.How to Become an Amateur Radio Operator.706: Computer Control and Soundcard Interface.Amateur Radio Frequency Allocations and Band Plans.
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