[RTTY] FT-1000D

[Jay WS7I]

Was building up an interface RS-232 for Lamar WA7LT where I do some 
contesting.  Ran into a problem that took me quite a while to figure out 
so I thought I would document it for the group(s).  Using the Max-232 
device which is about as easy as almost anything I discovered that some 
FT-1000's and 990's as well use an emitter follower on their serial out 
line.

I noticed this but never thought about it when building transistor FSK 
interfaces as I just used a substitution box until things keyed or 
diddled.  You won't notice this on Opto circuits of course.

But since the Max 232 is a TTL gate it doesn't have enough load. I added 
a 1.5K resistor to gnd in the interface box (one could fix it in the 
radio which Yaesu did in later runs but easier in my little box) did the 
trick.  You can measure the CAT coming from the radio Pin 1 to Pin 2 
(ttl out) and if its less than 5K add a resistor.

Total price for the Max232 Yaesu box was $6 plus a little box which I 
had.  (Actually $3 less as I got the Max 232 chips as samples from Maxium).


Jay WS7I