The Elecraft P3 is the most useful accessory in the TF4M Shack. The Green bar on the display shows the Receive VFO and the Red bar shows the Transmit VFO when operating Split.
A close second is the Bandmaster III from Array Solutions, which controls my Harris RF110A Linear Power Amplifier automatically as I change bands – and it also switches the Arctic King into line when I go to 160 Meters.
