Re: Minimally modified QCX-17 has been heard on 80, 60, 40, 30, 20, 17, 15, 12, 10m this UTC day !
I use a very simple device called PIC-A Switch which was an article in RadCom in Sept 2001. It uses a PIC to measure the frequency and then switches the filter appropriate to that frequency. It can be used to switch anything you like and can be powered via the coax if you want to switch aerials.
I don't know if it is still available on the web though.
On 25/05/2019 17:47, Steve Johnston via Groups.Io wrote: