Re: [TenTec] Omni VI Mod 3 and RTTY

["Bob McGraw - K4TAX" <RMcGraw@Blomand.net>]

In my opinion {there's a dangerous word} FSK is for the die hard purist.

AFSK is much easier, specially with today's radios, computers, software and 
interface boxes.
73
Bob, K4TAX

----- Original Message ----- 
From: "Tim Randa" <tranda@cox.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Monday, January 26, 2009 9:20 PM
Subject: Re: [TenTec] Omni VI Mod 3 and RTTY


A quick question on the subject. Why bother with the FSK when AFSK gets
the job done with much less hassle. Is there an advantage to FSK that I
as a extremely casual RTTY user haven't a clue about?

de Tim KØFL

Bob McGraw - K4TAX wrote:
> I too used my Omni VI Plus on FSK.  The 250 Hz filter worked will with the
> PBT properly adjusted.  The manual covers the alignment of the PBT 
> circuit.
> One extremely important point in using FSK is that the BFO oscillators 
> need
> to be very precisely aligned.  Follow the steps in the manual in their 
> exact
> order.  You probably will find it necessary to do this 2 or 3 times as 
> there
> is some interaction with the adjustments.  Also, a frequency counter that
> can read something in the order of 9 MHz to a resolution of 0.1 Hz is of
> great help and almost a necessity.  For better results, be sure the radio 
> is
> operating at room temperature for at least 1/2 hr with the covers in place
> before making these adjustments.
>
> After doing all of this, I too found AFSK was much easier to use.  Took 
> the
> audio IN and OUT from the connectors on the back panel and I let the VOX
> handle the RX/TX switching.
>
> 73
> Bob, K4TAX
>
>
> ----- Original Message ----- 
> From: "Ed" <w3nr@comcast.net>
> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> Sent: Monday, January 26, 2009 3:15 PM
> Subject: Re: [TenTec] Omni VI Mod 3 and RTTY
>
>
>
> > Jerry Pyle wrote:
> >
> > > I am in the process of setting up my station to run RTTY, preferably 
> > > FSK.
> > > My Omni VI Mod3 has all of the filter slots filled and upon inspection I
> > > found that there is not a 217 filter amongst the bunch.
> > >
> > > I have been on the searchable archives looking for a possible Inrad
> > > filter
> > > that will work in place of the 217 (which we all know TenTec no longer
> > > makes) or another workable solution using my existing 500hz filters.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Jerry - WB7S
> > >
> > > Basin, WY
> > >
> > >
> > >
> > > http://wb7s.home.bresnan.net
> > >
> > >
> > >
> > > 73
> > I use my Omni6 on RTTY without a problem. Had a 217 and sold it, too
> > narrow. Use LSB and your 500hz filter(s) and you won't have a problem.
> >
> > FSK is fine as long as the 2 xtals are 170Hz apart, any more/less you
> > will not be happy. I use AFSK and as long as it is set right you won't
> > have any problems.
> >
> > If you do use FSK, the PBT needs to be set at 3 o'clock.
> >
> > All that is needed for the FSK keying cicuit is a 1K resistor in series
> > with the TXD line.
> >
> > Ed W3NR
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
>
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