Benton,
Thanks for the tip. K4ABT suggested a 600 Ohm resistor across the soundcard
input, which I tried and it has dropped the signal level nicely.
Since it is designed as a mic level output, would it work better going into
the soundcard mic in?
73,
Mark
----- Original Message -----
From: "JBA" <ballen@na800.net>
To: "Mark Erbaugh" <mark@microenh.com>; <tentec@contesting.com>
Sent: Saturday, December 29, 2001 16:10 PM
Subject: Re: [TenTec] Pegasus line output
> Hi Mark,
> The Pegasus "Line out" is a true line out ;i.e. peak to peak >1 volt at
abt
> 600 ohms. This is what computer sound cards, mixing boards, and most
studio
> equipment is designed to use.
> The Pegasus Accessory plug "Audio in", and "Audio out" is at mic level.
For
> example, you could fed your mic audio into the radio through the "audio
in",
> and it'll work just like the regular mic input. I have run into this while
> working with wide band audio. To use the accessory jack in the manner that
> you are trying, you need to insert a 40dB pad.
> Hope this helps,
> Cheers,
> de Benton wb5twc
>
>
> ----- Original Message -----
> From: "Mark Erbaugh" <mark@microenh.com>
> To: <tentec@contesting.com>
> Sent: Saturday, December 29, 2001 12:41 PM
> Subject: [TenTec] Pegasus line output
>
>
> > I noticed a peculiarity with the line output on my Pegasus. I noticed
> that
> > when I had a straight through stereo cable (like the one that comes with
> the
> > Pegasus) running from the LINE OUT jack to my computer sound card LINE
IN
> > jack, that I was able to obtain proper signal levels with the soundcard
> > input control about half way. This is with the Pegasus line level set to
> > max. However, if I connect the output from the ACCY jack to my computer
> > soundcard, I have to turn the sound card input control all the way down
> and
> > the input still overloads on audio peaks. I'm actually using a K4ABT
> Rascal
> > interface for the proper cabling. The interface has a 1:1 isolation
> > transformer inline, but that's it.
> >
> > I then fired up the mV test mode on a Timewave DSP599zx. I used the CW
> > spot tone to generate a constant tone. I measured the output and got
282
> mV
> > RMS from the line out jack and 436 mV RMS from the ACCY jack. The input
> > impedance of the Timewave is 20 k ohms.
> > With an input impedance of 25 ohms, I got 8 mV RMS from the line out and
> 38
> > mV RMS from the ACCY.
> >
> > I had always thought that the Line Out jack and the line out on the ACCY
> > jack were in parallel. Obviously, there is some difference.
> >
> > It looks like if I'm going to use the Rascal interface, I'm going to
have
> to
> > pad the input unless there is a way to adjust it on the Pegasus. I don't
> > want to reduce the LINE OUT setting as that will reduce the speaker
> output.
> >
> > 73,
> > Mark, N8ME
> >
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> >
>
>
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