[aprssig] APRN news from Dayton!

Andrew Rich vk4tec at tech-software.net
Wed May 25 10:47:59 EDT 2011

Does anyone have example images ? 

Sent from my iPhone
Andrew Rich

On 26/05/2011, at 0:35, "Bob Bruninga" <bruninga at usna.edu> wrote:

> Traffic Cams:
> One use of these SSTV cameras might be on telephone poles along one's
> commute at the critical traffic points.  A driver can key up a PL tone and
> the next camera in range will send its view on some UHF channel to be
> displayed on a laptop running any SSTV soundcard software.
> The entire control system and RF hardware would cost only about $15 if it
> were not for the prohibition against tones (longer than 10 seconds) on the
> FRS channels.  I love the little COBRA CXT90's that have both CTCSS and DCS
> and can not only scan the channels but also the CTCSS and DCS to find who is
> on what tones.  They also have VOX and cost less than $15 each in pairs.
> The one problem is that I have not found a reliable DC point somewhere
> inside the radio that changes TTL level when it decodes a tone.  Actually,
> it is easy to find many such points, but as soon as the radio goes into
> power-saver mode and starts pulsing the receiver, every point in the radio
> starts pulsing too.  So the easiest thing to do would be to simply use an
> external VOX circuit on the speaker output to key the SSTV camera, and then
> it's noise would key the radio's VOX for the transmission.
> A press of the obnoxious CALL button in the mobile would start the process.
> Too bad the FCC prohibits tones (the SSTV) longer than 10 seconds on FRS...
> Bob, WB4APR
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