Mods - Icom 756 Series

Mods - Icom 756 Series
Icom 756 Series ESSB Mid-Fi Mods for Receiver and Transmitter

Disclaimer Notice:
The following modifications were obtained from an unknown source and should be done by qualified personnel at the owners risk. I am not responsible for any damage to, or illegal operations of the equipment as a result of mod errors or possible mod misinformation via this page.

Icom 756 Filter Mod
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Icom 756 Filter Mod

Connect a jumper between the outer pins on the 455 kHz acc filter slot. Then go to setup and select the FL-222 as an acc filter at 455 kHz. Now when you select USB-N or LSB-N as an operating mode, you will have a 15 kHz bandwidth for monitoring ESSB audio. This is overkill, as most TX info is less than 6 kHz due to 3.1 kHz low pass filter (some blow-by occurs, especially when higher frequencies are enhanced with EQ etc...

A better choice may be to jumper the ACC 9 MHz filter slot, allowing you to use the 9 kHz filter at 455 kHz I.F.

Notes:

Option #1) Icom 756 PRO II, PRO III, and 780 users should set their twin passband tuning controls "SFT" to a +300 carrier shift when listening in 3.6kHz to optimize single sideband fidelity on receive. This assures that when listening in 3.6kHz, that all of the receiver response is listening in a single sideband (the full 3.6kHz) as opposed to 3.3kHz on one sideband and 300Hz on the opposite sideband.
Option #2) Instead of using the "SFT" controls, you can permantly set the filter's carrier offset by performing the following procedures:
1. Navigate to menu...
2. Set

John M. Anning - NU9N
Phone: 1-815-631-5042
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