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Subject: HamDigitalDigest 99/322A
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Ham-Digital Digest Mon, 20 Dec 99 Volume 99 : Issue 322
Today's Topics:
Connecting sound card to Computer (2 msgs)
ground loops and audio isolation transformers (3 msgs)
Is there a way to get WWW access over packet? (2 msgs)
jnos - what versions for linux?
Kenwood Control program that runs on Liunx AND Windows!!!!! (7 msgs)
Making money by helping eachother, you scratch my back I'll scratch yours
WinAPRS vs UI View??
WTB firmware tiny2
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Loop-Detect: Ham-Digital:99/322
----------------------------------------------------------------------
Date: Sun, 19 Dec 1999 21:12:07 +0000
From: "D. Stussy" <kd6lvw@bde-arc.ampr.org>
Subject: Connecting sound card to Computer
Both.
On Sat, 18 Dec 1999, Clifford Buttschardt wrote:
> 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
> > > 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 13:24:28 -0800
From: Clifford Buttschardt <cbuttsch@slonet.org>
Subject: Connecting sound card to Computer
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: Fri, 17 Dec 1999 18:10:52 -0500
From: "Rob" <NoEmail@NoWay.com>
Subject: ground loops and audio isolation transformers
I have some ground loop problems between my rig and sound card. I currently
use two resistor networks to reduce the audio levels. (one for the line from
the sound card speaker out to the rig mic input and one for the line from
the rig aux audio out and the sound card mic input)
I would like to use some audio isolation transformers on both audio lines
(I,e. the line from the sound card speaker out to the rig mic input and the
line from the rig aux audio out and the sound card mic input)
Does it matter where I place the audio isolation transformers on these two
lines? e.g Can I place it on the side closer to the sound card with the
resistor network on the other side of the transformer closest the rig?? Or
should it be vice versa?
73's
Rob
>.
------------------------------
Date: Sun, 19 Dec 1999 13:36:15 -0500
From: "Bob Lewis" <aa4pb@erols.com>
Subject: ground loops and audio isolation transformers
Just curious. When you have the ground loop problem are the radio and
computer plugged into the same power outlet? How long is the cable
run between the rig and the sound card? I've not had any ground loop
problems but the IC761 and computer are about a foot apart with only
about 2 feet of cable.
Rob <NoEmail@NoWay.com> wrote in message
news:VM674.199071$5r2.503727@tor-nn1.netcom.ca...
> Jim,
>
> Yes, those audio isolation transformers do a great job when they
are used
> right!
>
> Unfortunately, many people connect one lead of the secondary and
one lead of
> the primary BOTH to ground usually INDIRECTLY via a chassis. If
you dos
> this, the audio isolation transformer is useless (as you know).
>
> I have also found that sometimes it is necessary TO COMPLETELY
isolate the
> ground of the computer from the ground of the rig. To do this, you
MUST
> also isolate the ground used by the PTT. Instead of using a simple
> transistor to key the rig's PTT line from the serial port. It is
necessary
> to use an opto isolator circuit.. It is really not that much more
To be continued in digest: hd_99_322B
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