In fact, most radios except Icom assume that Mark is "FSK Input
Open" (or FSK Input High) which is consistent with the logic
state "1."
However, since most terminal units and FSK interfaces use a
transistor or opto isolator fed from the hardware UART (serial
port) - the high at the output of the UART on Mark is inverted
by the interface! In order to accommodate the inversion by
the output device in the Terminal Unit/Interface, all Yaesu
and Kenwood radios need the appropriate menu item (or DIP switch
in older radios) set to "reverse" in order to transmit "right
side up."
73,
... Joe Subich, W4TV
microHAM America
http://www.microHAM-USA.com
http://groups.yahoo.com/group/microHAM
support@microham.com
> -----Original Message-----
> From: rtty-bounces@contesting.com
> [mailto:rtty-bounces@contesting.com] On Behalf Of Inbody, Donald S
> Sent: Sunday, February 11, 2007 8:16 PM
> To: RTTY Reflector
> Subject: Re: [RTTY] need some help
>
>
> In the case of the TS-2000, the "normal" setting is actually
> inverse, and the "inverse" setting is normal. For some
> reason the Japanese think FSK is normally in the USB side of
> the carrier freq.
>
> 73, Don ADØK
>
> -----Original Message-----
> From: rtty-bounces@contesting.com
> [mailto:rtty-bounces@contesting.com] On Behalf Of Jim Rhodes
> Sent: Sunday, February 11, 2007 18:22
> To: john; 'RTTY Reflector'
> Cc: *TOM@ADELPHIA; * MOUSE *CITYNET
> Subject: Re: [RTTY] need some help
>
> Welcome to Kenworld! I use a 570, so the menu item may be different.
> On my 570 the menu item is names "key-down polarity for fsk mode" and
> it needs to be "on" or I will transmit upside down. The menu item may
> have a different title. But it seems like all the Kenwoods have this
> setup issue.
>
> At 05:35 PM 2/11/2007, john wrote:
> >I am running a ts850sat, into a alpha pa amp, using
> writelog, and mtty
> >runing fsk..
> >the problem is that I copy ok, but transmit upside down...
> >in mtty the lsb is really fsk is checked...
> >going reverse, means I do not copy but my transmit signal is ok
> >I am at loss as to what happened, the night previous on 40, things
> >started locking up in transmit--If I went barefoot , no
> lockup.. I did
> >do a reset on the 850-if this is related,, I just do not know--
> >can anyone give me some insight on this..
> >\thanks john w8wej
> >
> >
> > >
> > >
> > >
> > >
> >_______________________________________________
> >RTTY mailing list
> >RTTY@contesting.com
> >http://lists.contesting.com/mailman/listinfo/rtty
>
> Jim Rhodes K0XU
> jim@rhodesend.net
>
> Experience is the thing you have left when everything else is gone.
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>
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