Add CTCSS PL Tones to Your Old VHF Rig - Nashua Area Radio Society
Yaesu FT-227-R CTCSS Tone Board Modification
EveryMarket
4/8 tone CTCSS encoder
Multitone CTCSS Encoder with OLED Display
A PIC controlled DDS-60 signal generator.
4/8 tone CTCSS encoder
Multitone CTCSS Encoder with OLED Display
CTCSS ENCODER KIT - CS Tech
CTCSS Encoder - SARCNET
0.5MHZ‑470MHZ Signal Generator,RF Signal Generator Audio Modulation Signal Source Conditioning Radio 800Hz,Analog Sub-Tone Digital Sub-Tone,for Aviation/Wireless Communication/Manufacturing: Amazon.com: Industrial & Scientific
PIC CTCSS/AFSK Generator
Sub-tone generator for VHF-UHF rigs
This article is prompted by a recent necessity to add tone squelch to the local repeaters to combat interference from various sources