[Yaesu] FT-ONE - memory board. Anyone got one, made one, or want one?

[Dr. Gerald N. Johnson]

On 6/3/2011 5:37 AM, David Kirkby wrote:
> I find the fact the FT-ONE will lose memories if powered off and
> disconnected from the mains unless the optional memory unit is
> installed is a bit annoying. I would have thought on a $3000 rig,
> Yaesu should have added the memory (only 1024 bits of SRAM), and not
> sold it as and option. But the fact is they did.

When the rig was new, those chips probably cost $10 each, and the option 
near $100. The half GB modules for PCs that cost $20 aren't really SRAM, 
they are DRAM with built in refresh. Which makes them easier to make in 
large capacities.

73, Jerry, K0CQ
>
> Does anyone have one they could photograph and send a high quality
> picture? I can see the layout from the service manual.
>
> I was thinking of making one. Getting the original SRAM ICs wold be
> next to impossible as they are only 512 bits - modern chips would be a
> lot larger. The problem with modern chips is they have more pins, so
> the board would need to be bigger, or surface mount devices used.
>
> It might be possible to replace the two SRAM devices (512 bits each)
> with one single modern device, though I don't know for sure.
>
> If I did design and make one, would others be interested in buying
> them? I guess I'd sell them around $50 to cover cost of parts, labor
> and development time.
>
> My own FT-ONE has the battery box (takes 3 x AA cells), but no memory board.
>
> If anyone has a board they want to sell, then that would be an easy option.
>
> As a matter of interest, the keyer which was an option for the FT-ONE
> looks remarkably easy to build, assuming the keyer chip is still
> available.
>
> Dave
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