Ham Radio
Ham Radio, Electronics, Software and more...

Home » Ham Radio Mods » Icom Mods » ICOM IC-756 Spectrum Scope Adjustments (ICOM IC-756 Spectrum Scope Adjustments)
ICOM IC-756 Spectrum Scope Adjustments [message #3065] Tue, 03 March 2015 11:51
root is currently offline  root
Messages: 208
Registered: December 2004
Senior Member
Author: Adam MAURER, VK4CP - vk4cp@bigpond.com

Access to the RF Unit is required.

Remove bottom cover and then remove cover to RF Unit - see below.

To increase overall Scope gain:

Lower the value of R963 (100k as fitted).

I put a 56k 1/4w through-hole resistor across R963 - see above - making the combined resistance approx 36k. (One resistor leg was soldered to pin 2 of IC-961 and the other leg to the junction of R966 and R964)

To be neater you could remove the small 0603 SMT resistor and replace it with a 39k 0603 part.

To adjust Scope base-line:

Trimpot R966 will adjust the base-line of the Spectrum Scope.

Thanks to http://www.qsl.net/vk4cp/ for the modification.
Previous Topic: ICOM IC-756 General Coverage HF TX Mod (1.6 - 30.0MHz)
Next Topic: ICOM IC-756 ACC1 Audio Output Increase Mod
Goto Forum:

Current Time: Wed Dec 19 05:24:45 EST 2018

Total time taken to generate the page: 0.03212 seconds