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
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