[Space] Audio

Albert Alexander albert.alexander at gmail.com
Thu Mar 18 23:47:17 PDT 2010


Sounds right to me, but I'll defer to Nils. I know they do not transmit
simultaneously.

On Thu, Mar 18, 2010 at 8:44 PM, Christie Dudley <longobord at gmail.com>wrote:

> I think the idea we had was that they were each sending at the same
> interval.  If they maintain even reasonably good clocks and aren't aligned,
> they shouldn't ever overlap.  I think their duty cycle is low enough that
> this wouldn't be a problem.
>
> (I'm assuming that you mean amateur radio, not an actual walkie-talkie,
> here?)
>
> Christie
> _______
> "We also briefly discussed having officers replaced by very small shell
> scripts." -- Noisebridge meeting notes 2008-06-17
>
> The outer bounds is only the beginning.
> http://www.flickr.com/photos/genriel/sets/72157623376093724/
>
>
> On Thu, Mar 18, 2010 at 6:24 PM, Albert Alexander <
> albert.alexander at gmail.com> wrote:
>
>> Nope, they transmit at separate times. We could use a fet to switch
>> sources but that's more parts and wires.
>>
>>
>> On Thu, Mar 18, 2010 at 6:10 PM, Greg Stramback <grog at piratelabs.com>wrote:
>>
>>> I'm making the assumption that we're expecting a certain percentage of
>>> garbled / unreadable packets due to two audio sources being combined?
>>>
>>> -g-
>>>
>>> On Thu, Mar 18, 2010 at 5:56 PM, Albert Alexander <
>>> albert.alexander at gmail.com> wrote:
>>>
>>>> The walkie-talkie is getting audio from two sources. I suggested using a
>>>> splitter to combine the sources, but this will load down the output
>>>> transistors unless we add two resistors in series before the splitter. 10k
>>>> is fine. This will attenuate the current of each signal. We could use a
>>>> summing amp if we want to avoid the attenuation, or we could just turn up
>>>> the volume.
>>>>
>>>> Will test G1 audio out AC coupling tonight after 5moF
>>>>
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>>>
>>
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