[DogParkList] Yaesu FT-847 Question

[Chuck Gould]

Hi Randel,

If it's the one that has the Apple Serial ports (the round ones), I  
know for sure it doesn't recognize the input levels coming from the  
radio [interface]. Not sure about other Keyspan models.

I made my own interface for my ICOM Pro-III, and had the same  
problems with the Keyspan that I had experienced with a Yaesu HT  
adapter. According to my testing, it seems to be for the same  
reasons. These are both interfaces that get power from DTR, but don't  
actually provide a negative voltage for the input data signal. The  
Keyspan needs that. The majority of PC serial ports will recognize  
TTL levels for input, so it's easy to make an inexpensive interface  
that only provide positive going data levels. On the input line, a  
TTL "zero" level will be recognized on most interfaces, but the  
Keyspan requires it to go negative (see RS-232 specs). Technically  
(if I remember correctly) the spec for a valid data level allows for  
positive levels (at least to a TTL zero max).

Anyway, I purchased an IOGear serial adapter and it works fine (has  
OS-X driver included). It's pretty cheap, too ($19.95, I believe).  
Although I haven't tried with the Yaesu HT interface, I assume it  
will work fine with that also.

Hope this helps.

73,
Chuck, WB6KDH

On Nov 28, 2005, at 1356 , Fr Randel Livingood wrote:

> Hello Mac Hams!
>
> I have a FT-847 and an eMac.  I am attempting to run the  
> MacLoggerDX and am running into a bit of bother.  I have the eMac  
> connected to the 847 via a Keyspan USB/serial adapter, but for some  
> reason the computer and radio are not recognizing each other.  I  
> get the "not connected" and "no data" warnings on the program.  Is  
> there anyone out there who has a similar setup who would be able to  
> point me in the correct direction?
>
> 73,
>
> Randel KG6IIP
>
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