Here is the Frequency Expansion Mod for the Icom-91AD. I have used this on all of my older IC-91AD’s (before selling them) and know that the mod works without problem, but as always, USE AT YOUR OWN RISK. If you are not confident in making modifications to SMD’s, then please DO NOT ATTEMPT..!!
REVISED PICTURES as of 12-July-2011:
(Click to enlarge)
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#1 by A Brown on 2011/07/10 - 15:38
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Is it 3 solder joints (one on one side and two on the other that need to be de-soldered? And thanks for posting this mod.
73
Ki6FJE
#2 by mikelee on 2011/07/12 - 08:55
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I’ll post some clear-er pictures on the mod… should be on the BLOG shortly..
it’s all on ONE side of the board – upper right, as you’re facing the scalloped corner of the board to the right..
you’ll need to remove D13 and D15..
the pictures make it out clearly..
I did this mod to both of my 91AD’s in the past (they’ve since been sold) – and it works nicely..
73
Mike
#3 by Roger Kehr on 2012/01/18 - 20:54
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I have been working on printed circuit boards for 40 years and was totally amazed at the size (or lack of) the diodes. Where would I find a person or shop in the Salt Lake City area who can do this small of a project (size)?
73
Roger