Re: [TenTec] OmniV and PSK31

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

With the Paragon II, the Omni VI Plus and now the Omni VII, I connect the 
line in and line out on the back of the radio direct to the sound card. 
There are no pads, no transformers, and no interface box.  The sound card in 
the computer provides for line in and line out signals.  All adjustments are 
handled by the Windows XP mixer via the MixW2 software.  T/R switching is 
handled by the VOX set to max gain and min delay.  I am very pleased with 
the IMD reports of -25 dB or better with the PSK-31 mode.
Transmitter is always adjusted  for max or rated output thus RF Level is 
always 100%.  The level from the sound card along with the respective input 
control on the radio is then adjusted to produce 30 to 35 watts of output 
with PSK-31 data.  For RTTY I use AFSK mode and adjust the soundcard or 
respective input control on the radio for 50 watts output.  No additional 
cooling is used under these conditions.  Speech processing is always OFF and 
the levels are such that the ALC LED does not illuminate.
Now if you find it necessary to feed signals into a MIC input either on the 
sound card or the radio, then some 20 to 30 dB of resistive attenuation is 
most likely needed.  This can be a simple L network consisting of a 10K ohm 
series resistor with a 1K ohm resistor to ground.  These can be mounted with 
care inside the respective connectors.  For these, 1/4 watt resistors are 
very adequate.  The 10K ohm resistor is always in series with the source 
signal and the 1K ohm resistor is across the input.
73
Bob, K4TAX


----- Original Message ----- 
From: <wo8l@aol.com>
To: <tentec@contesting.com>
Sent: Monday, March 17, 2008 8:00 PM
Subject: Re: [TenTec] OmniV and PSK31


> Do you run an interface or any form of impedance matching?
>
>
>
> --Rick
>
> ??WO8L
>
>
> -----Original Message-----
> From: Bob McGraw - K4TAX <RMcGraw@Blomand.net>
> To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
> Sent: Mon, 17 Mar 2008 8:45 pm
> Subject: Re: [TenTec] OmniV and PSK31
>
>
>
>
> Absolute correct.  Run the RF output always at 100% and reduce the audio
> level from the sound card and or the mike gain to produce 30 to 35 watts 
> of
> output.  Now then, this says tune up to maximum output or rated output in
> the TUNE or CW mode.  Leave the RF level or Drive or how ever your radio 
> is
> defined to operate at maximum or rated output.  Should be about 100 watts 
> or
> so.  Then with signal from the computer soundcard, adjust the soundcard
> level in combination to the MIC or Line level so that the output is abut 
> 30
> to 35 watts.  If you are feeding the MIC input then the level control 
> should
> be about the same as you use for SSB.
>
> Key point, do not use any form of speech processing and do not adjust any
> level such that the ALC indicator is active.  This applies to any radio
> regardless of make, model or what ever.  If you feel that you need more
> watts, then you need to add an external amp.  And here again, tune to max 
> or
> rated output and leave things this way.  Do not re-tune for lower power
> level.  Then reduce audio from the sound card such that power output is 30
> to 35 % of rated output.
>
> PSK set-up and operation is a piece of cake.  Most hams make it too
> complicated.
>
> 73
> Bob, K4TAX
>
>
> ----- Original Message ----- 
> From: "Larry Rockne" <wa7hdz@clearwire.net>
> To: <tentec@contesting.com>
> Sent: Monday, March 17, 2008 6:26 PM
> Subject: Re: [TenTec] OmniV and PSK31
>
>
> > I don't have an OMNI mine is a Jupiter, and hve been told by several hams
> > and TT to run my 'RF output'
> > at 100% out and use the soundcard and interface to adjust the meter
> > reading to ~30 watts.
> > However, I'd much rather adjust the R.F. out to say 30 watts and leave it
> > set.
> > A note to K4TAX: I am not familiar with the OMNI, but with the jupiter
> > they trll me to set the mic level the same as I would SSB. Your post says
> > to set the mic level to 30 watts. What about your R.F. out setting?
> > The more I read about PSK and the TT the confusder I gets. Hi
> >                                   Larry WA7HDZ
> > _______________________________________________
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>
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