Mark, I don't know about the Pegasus, but many receivers provide a
constant-level audio output on the rear connector, and frequently that
output is at a pretty high amplitude level compared to other outputs, such
as the Line Output on your rig.
72/73, George W5YR - the Yellow Rose of Texas QRP-L 1373 NETXQRP 6
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe SOC 262 COG 8
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
Icom IC-756PRO #02121 Kachina #91900556 IC-765 #02437
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Mark Erbaugh wrote:
>
> 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
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