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Subject: HamDigitalDigest 99/321A
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Ham-Digital Digest Sun, 19 Dec 99 Volume 99 : Issue 321
Today's Topics:
cancel <kriss-D2D788.19572117121999@[192.107.149.20:119]>
Connecting sound card to Computer (5 msgs)
Explain freq. settings
ground loops and audio isolation transformers (2 msgs)
Kenwood Control program that runs on Liunx AND Windows!!!!!
WinAPRS vs UI View??
Send Replies or notes for publication to: <Ham-Digital@UCSD.Edu>
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We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
Loop-Detect: Ham-Digital:99/321
----------------------------------------------------------------------
Date: Sat, 18 Dec 1999 11:40:04 -0600
From: Richard Kriss <kriss@spec.com>
Subject: cancel <kriss-D2D788.19572117121999@[192.107.149.20:119]>
Article <kriss-D2D788.19572117121999@[192.107.149.20:119]> cancelled by
kriss@spec.com
>.
------------------------------
Date: Sat, 18 Dec 1999 20:48:43 +0000
From: "D. Stussy" <kd6lvw@bde-arc.ampr.org>
Subject: Connecting sound card to Computer
On Sat, 18 Dec 1999, Rob wrote:
> I heard that it is NOT a good idea to connect both channels (Left and Right)
> of the sound card's line output to the Rig's mic input. It might cause
> distortion. (On the other hand, I heard it doesn't matter whether the rig's
> speaker output is connected to both channels of the sound card's line input
> or mic input).
>
> Is this true? Will there be distortion?
>
> I also heard if you just used a mono plug for the sound card's line output
> (or speaker output), it will short out one of the channels and may cause
> distortion. It is best to use a stereo plug and only use one of the
> channels. Is this good advice?
....If someone were smart, the soundcard driver software could be re-written
so
each audio channel were a different "port" thus creating a dual-port virtual
TNC. Of course, there would have to be two PTT circuits, two DSP engines for
RX, etc. Then the above situation would be moot.
>.
------------------------------
Date: Sat, 18 Dec 1999 23:07:20 +0000
From: "D. Stussy" <kd6lvw@bde-arc.ampr.org>
Subject: Connecting sound card to Computer
Depends on the soundcard. Most soundcards now have stereo inputs.
On Sat, 18 Dec 1999, Clifford Buttschardt wrote:
> Good comments these, but I am still confused. Is the line and microphone
> inputs USUALLY stereo plugs? I think the mic input is always stereo but
> does it use the "ring" in any way? I would guess the line input would be
> mono in most cases. Is this true most of the time? Cliff K7RR
>
> On Sat, 18 Dec 1999, D. Stussy wrote:
>
> > On Sat, 18 Dec 1999, Rob wrote:
> > > I heard that it is NOT a good idea to connect both channels (Left and
Right)
> > > of the sound card's line output to the Rig's mic input. It might cause
> > > distortion. (On the other hand, I heard it doesn't matter whether the
rig's
> > > speaker output is connected to both channels of the sound card's line
input
> > > or mic input).
> > >
> > > Is this true? Will there be distortion?
> > >
> > > I also heard if you just used a mono plug for the sound card's line
output
> > > (or speaker output), it will short out one of the channels and may cause
> > > distortion. It is best to use a stereo plug and only use one of the
> > > channels. Is this good advice?
> >
> > ...If someone were smart, the soundcard driver software could be re-
written so
> > each audio channel were a different "port" thus creating a dual-port
virtual
> > TNC. Of course, there would have to be two PTT circuits, two DSP engines
for
> > RX, etc. Then the above situation would be moot.
>.
------------------------------
Date: Sat, 18 Dec 1999 20:29:33 -0500
From: "Bob Lewis" <aa4pb@erols.com>
Subject: Connecting sound card to Computer
> I heard that it is NOT a good idea to connect both channels (Left
and Right)
> of the sound card's line output to the Rig's mic input. It might
cause
> distortion.
It is NOT a good idea. When you connect the two outputs together you
are shorting the outputs. Whether this causes any distortion depends
on the sound card output circuit design and how well balanced the two
outputs are. If, for example, you had the mixer balance all the way
to one side, the dead side would attempt to short the output of the
other. The output impedance *may* be high enough to prevent
distortion or damage but you never know how it was designed. It's
best not to do it and there's no advantage to it that I can think of.
In pro audio a resistor is often inserted into each channel in order
to provide a "resistive combiner" circuit to feed a stereo channel
into a mono channel. With PSK31 both channels have the same signal so
there's no reason to do it.
> (On the other hand, I heard it doesn't matter whether the rig's
> speaker output is connected to both channels of the sound card's
line input
> or mic input).
It doesn't matter because because you are shorting two inputs. The
load impedance drops to one-half but it's still plenty high enough
not to overload the receiver's output.
> I also heard if you just used a mono plug for the sound card's line
output
> (or speaker output), it will short out one of the channels and may
cause
> distortion. It is best to use a stereo plug and only use one of
the
> channels. Is this good advice?
Good advice! A mono plug will short one output. It may not cause
distortion in the other channel, but it's never good practice to
short an output unless you know for sure that the circuit design can
handle it.
>.
------------------------------
Date: Sat, 18 Dec 1999 19:53:23 -0800
From: Clifford Buttschardt <cbuttsch@slonet.org>
Subject: Connecting sound card to Computer
Which input, mic or line? I can not make any sence out of these
statements that do not define what is being said! Cliff K7RR
Sat, 18 Dec 1999, D. Stussy wrote:
> Depends on the soundcard. Most soundcards now have stereo inputs.
>
> On Sat, 18 Dec 1999, Clifford Buttschardt wrote:
> > Good comments these, but I am still confused. Is the line and microphone
> > inputs USUALLY stereo plugs? I think the mic input is always stereo but
> > does it use the "ring" in any way? I would guess the line input would be
To be continued in digest: hd_99_321B
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