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

[wa4pgm at kinex.net]

I've been using the Buxcomm with my FT1000 Field for about a year now
without trouble. Maybe the 920 is a bit more stubborn, Ed (VP9GE) and I
did short the pins together from the rig and the tones do change so I
guess it's my interface after all. Wish I would have spent more time in
preparation for my trip but I didn't realize the Yaesus were so stubborn.
I've learned a lot from this trip and I appreciate everyone's williness to
help. You guys and gals are GREAT! I'm not sure if I can come up with
enough parts to build a interface or not. I saw a Radio Shack in Hamilton
the other day so maybe there's still a chance.
THANKS!
Kyle


>
> ----- Original Message -----
> From: "Kok Chen" <chen at mac.com>
> To: "John Fleming" <john at wa9als.com>
> Cc: <rtty at contesting.com>
> Sent: Tuesday, July 13, 2004 2:54 PM
> Subject: Re: [RTTY] Yaesu FT-920 setup - HELP!!
>
>
>>
>> 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
>
> I don't know exactly what he has, but I'm sure it's based on a 4N25 opto.
> See
> http://www.k4abt.com/psk31parts.htm
> for examples.  - John
>
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