This newest version of the Ampkeyer has several important improvements of the last model.

First and foremost, there is now a power switch. It's mounted on the front panel for ease of use. There is a power on LED.

You have a choice of two radios. Either one will key the Ampkeyer.

One radio could be HF, the other VHF/UHF, so you can key a HF amplifier or a VHF amplifier.

Generally the key line from your transceiver is normally high. In other words, the transceiver will pull down the transmit line to zero volts when you press the PTT or send CW.

This version of the Ampkeyer works the same way, but it also has the option of keying when the sense goes from low to high. And both radios have the option of using either one. So radio one might key high to ground, while the VHF transceiver keys low to high.

All the selections are chosen with DIP switch—there are no more jumpers to move.

The output may be either a power MOSFET or a fast switching relay. The relay of course maybe defeated if desired. There is an option that uses a solid state relay that will switch both positive or negative key lines.

A front panel switch will place the Ampkeyer in standby use, so you can keep your Heathkit amplifiers running, but not keyed if you don't need the amp.

There is a LED mounted on the pcb of the Ampkeyer to let you know if the input lines are connected correctly. You can turn this feature off.

A resettable chemical fuse protects the Ampkeyer as well as the power wiring. The Ampkeyer automatically selects the correct voltage polarity.

The Ampkeyer will work with just about any amplifier; old or new.

The Ampkeyer is $53.95 +$8 shipping.

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Inside the new Ampkeyer. All functions are set by a dipswitch.