Uploaded May 2024 | Updated September 2026, 2 weeks ago

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00:00 - Start
00:02 - Introduction
00:47 - Icom Connector standards
02:52 - Audio trouble notice
03:00 - 13.8 Volt signal
05:40 - 8 volt signal
06:52 - SEND, HSEND, VSEND Signals
14:46 - SQL-S Signal
16:34 - AF Output Signal
23:36 - MOD input signal
26:49 - BAND Signal
32:16 - ALC Signal
33:28 - FSKK or RTTYK Signal
35:36 - BDT and TKEY Signals
36:11 - Summary

This is a description of the standard accessory connector signals on Icom HF radios and what they are used for.
These descriptions apply not only to the IC-7100 and IC-7300, but to almost all Icom HF and HF-VHF-UHF radios made since 1987.

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