[RTTY] Yaesu FT-920 setup - HELP!!

[Kok Chen]

On Jul 13, 2004, at 12:36 PM, John Fleming wrote:

> Kyle, if you're using a BUXCOMM interface that utilizes a 4N25 or 
> similar
> optoisolator, I'm not a bit surprised it won't key as expected.  Do 
> youself
> a favor - Make a plug for your rig's FSK ACC connector with a wire 
> coming
> out for ground and FSK SHIFT.  With the rig in RTTY mode, put it in 
> transmit
> manually and then short the wires together intermittently and see if 
> you get
> the expected tone shifts.  If so, and I believe you will, then it 
> proves the
> 4N25 interface will not key the Yaesu.  It may appear to short using a 
> VOM,
> but it's actually not low enough to key the stubborn Yaesus.  If it 
> doesn't
> key manually, then there's some other problem with the rig itself.  
> Let us
> know what happens.  This has been documented somewhat by more than one 
> of us
> previously.  Maybe W7AY would care to comment?

Hah, you'd read my mind, John.  I had just 10 minutes ago sent Kyle a 
private email suggesting that he monitor the rig while grounding and 
ungrounding the SHIFT key in the 4-pin DIN connector (I assume the 
connector is the same one used on my FT-990 and FT-1000MP) to first 
make sure his rig is set up correctly. (Yeah, I did mention a dummy 
load, HI.)

I then mentioned to Kyle that a Darlington transistor would not be able 
to drive a Yaesu.  I have no idea what a Buxcomm is, though.   Does it 
use a optoisolator with a Darlington output?  A normal optoisolator 
should work if you hit the LED with a large enough current, but 
probably not from the wimpy RS-232c signals.

73
Chen, W7AY