View Single Post
Old 12th Nov 2018, 10:45 am   #340
G6Tanuki
Dekatron
 
G6Tanuki's Avatar
 
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
Default Re: Users of 2 metre Amateur Band?

Quote:
Originally Posted by JohnBG8JMB View Post
"I've got a circuit somewhere for a PIC-based generator that does all the CTCSS tones as well as 1750Hz (and 1800Hz which some Continental repeaters used). The tones (and silence) are selected by a single push-to-make switch that cycles through the options - you replace your old toneburst on/off switch with a push-to-make button or a biased toggle-switch."

Fine, but how do you know what tone you have selected? You need a physical indication...
You count the number of times you press the button [it starts at CTCSS-inactive at power-up].

Then you use your memory - just as we did to select a channel using a rotary or thumbwheel-switch in the dark or when the control-box was concealed under the dashboard.

"I want R3 - that's crystalled in channel 4 - and you heard the famous Ledex-rattle from somewhere behind you.
G6Tanuki is online now