[Icom] IC-756

[Tony Hwang]

Hi,
They've gone backward? Not a Hall generator? My gosh. I am becoming
antiquated. Still 'scope will come handy to deal with it.
73,
Tony, VE6CGX
P.S. If I had it, I'd redesign or modify the ckt and do whatever I want
     not to spend 130.00 for a small parts like that. Don't have a ham
     friend in JA? Ask his help.

Greg Ordy wrote:
> 
> Tony, VE6CGX wrote:
> 
> >>>> That IR opto chopper has to be in alignment because it uses two pulses.
> 
> Sadly, the encoder in the 756, the PRO, the PRO 2, and I
> suspect many other recent vintage ICOM radios uses a
> magnetic disk as opposed to an optical chopper. If it were
> an optical chopper, fixing and cleaning might be much
> easier (and cheaper). The magnetic disk contains approximately 250 individual
> magnets that pass by a coil which senses the movement.
> The encoder case contains the disk, the coil, and a PC
> board with several ICs and trimmers.
> 
> I once got involved with trying to find a cheaper source for the
> ICOM encoder, which was $130 in the US. For some reason,
> it is much cheaper in Europe. Go figure.
> 
> The whole thing blew up in my face, and was one of my
> bigger and better follies. You can read about it on the following
> web page:
> 
> http://www.seed-solutions.com/gregordy/Amateur%20Radio/Experimentation/IC756%20Encoder.htm
> 
>     Greg Ordy, W8WWV
> 
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