On Tue, 2020-07-07 at 17:15 -0500, Richard Shaw wrote:
I didn't want to get specific as it's not a use case for many
others
outside of ham radio. Digital communications with ham radio is done
with a sound card and the audio is sent to the radio and transmitted
over the air where it is then captured and interpreted by the
receiving station. I want to simulate this in a meeting environment
with two laptops without radios.
The jack on my new laptop seems to support the 4 conductor jack
(stereo audio and mono mic) but I don't have the proper cable to
split it out. Regardless it's always suggested to use a dedicated
sound card for this purpose so general system sounds do not get
transmitted over the air, so an additional USB->Audio adapter is the
correct long term plan.
I assume that you're also doing some DC blocking and signal
attenuation, because simply connecting a sound card line out to a
microphone input is just not compatible. Of course a decent USB
outboard audio interface can have a line in and line out.
Going all analogue, and pointing a microphone at a laptop's speaker,
one in each laptop directions, could be a nice visual demonstration of
wireless transmission. And demonstrate interference handling, too.
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