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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
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Registered: December 2004
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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.
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