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Icom V-8000 tx audio

AudioShockwav

Extraterrestrial
Staff member
Apr 6, 2005
7,369
4,977
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Sierras Near Yosemite National Park
Here is a easy-to-do mod to improve tx audio dramatically!
In addition to my mod from 17-12-2002 here-??s the ultimate way to improve tx audio
Problem: tx audio sounds muffled and is not loud enough. Reason is too less mic amplification and therefore too less average fm deviation and too much low pass effect in the mic amp stages.
Background: The mic signal is amplified, then af-clipped and sent through a low-pass filter (all in op-amp IC3 on logic board). The af-clipped signal is then applied to the D/A converter (IC 5 on main board), where the deviation is set depending on wide or narrow operation. There is no way of alignment provided by Icom.
Modification:
  1. Locate IC 3 and nearby C79, C50 and R103 on the pictures of the logic board and the board layout.
  2. Replace C79 (220p) with 68p and C50 (220p) with 150p
  3. Replace R 103 (150k) with 330k
  4. That-??s all!
  5. Effect is much more average deviation without changing max. deviation and a better frequency range.
v8000micamp.gif
v8000layout.jpg
 
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  • @ AudioShockwav:
    Sorry to hear you troubles, he is famous around here for his scams.
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  • @ kb9ghn:
    My first thought was the i.r.s. may be interested in a long term money making scam without proper taxes being paid..probably more than electronics involved.
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    My first thought was why hasn't someone paid him a visit. I mean, his address is posted above.
  • @ beakster1715:
    Good news! I opened an appeal case after eBay sided with superhawkwss6. I also opened an IC3 case & sent that information to eBay. Within an hour they responded, reversed their decision and returned all of my money. Unfortunately, superhawkwss6 stole my CB radio and eBay will likely not suspend or close his account, but rather allow him to continue his criminal activity. I think I'll still file a report with our sheriff's dept (the sheriff is a friend of mine) though I know this type of crime isn't worth their time. This guy needs to be stopped and I'm certainly going to do my best to make that happen.