[Hammarlund] Just come back again to this maling list

[Katsuhiko Hirai]

Dear list member,

I am a revived person into this list since around 1998.
Will you please let me join together again?

Recently I got a second RF unit of SP-600 in the auction.
The unit has however the tuning shaft without large size knobs.
I am looking for a tuning knob for it.
Will you let me know if you have a spare one?

Now I am planning to construct the motor driven spead dial mechanics
that synchronize to the rotation of the tuning shaft, through 
monitoring the output frequency from the local oscillator of SP-600.

Several years ago, I heard that SP-600 designers had made their idea 
that the spread dial digit had to originally indicate the fixed 
same cycle digit under any frequecy band like collins receivers. 
However, the actual receiver did not have been implemented 
their originals as you know.
My dream is to implement their idea by the micro processing technology 
that monitors the rotation of a knob, calculates the frequency deviation 
and generates the pulse signal for the stepping motor to drive 
a tuning shaft of the SP-600 receiver.
In order to this controling, the spead dial shaft has to be 
disconnected from the tuning shaft mechanics of SP-600.

Will you please advise me if you have already the similar experience to 
make accurate digit spreading on the receiver?

Best regards,
Katsuhiko Hirai
Yokohama, Japan
exN8EYH, JA3ECA, now JO1GEG
-- 
<mxc04040 at nifty.ne.jp>