[amsat-bb] Re: Fw: Digital Slow Scan in space and free food...

[Robert Bruninga]

Argent Data makes a small SSTV camera about 1.5" cube for under $100.  For
all practical purposes it is a modern replacement for the original Kenwood
VC-H1 SSTV handheld.  He makes them for balloons etc.

We have one on a model satellite hanging out in our lobby and anyone can
trigger it with any FRS radio with the right channel and tone, and then
they can also receive and display the picture on any laptop with SSTV
software on it by just letting the laptop's mic hear the FRS radio
speaker.

The intent of this "spysat" in the lobby was so we could see when someone
was having a reception out there and there might be free food.

Bob, WB4APR

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Graham Shirville
Sent: Friday, September 07, 2012 4:39 PM
To: Simon HB9DRV; 'AMSAT BB'
Subject: [amsat-bb] Re: Fw: Digital Slow Scan in space

Hi Simon,

Good question - "medium" was a deliberately vague term as it will also
depend on the camera and available data rates etc.

I was hoping we might be able to move on from analogue SSTV now.. we
should
be able to achieve much better quality images,,,as you suggest the
challenge
would be to do the digital encoding on board the spacecraft without using
lots of power but, as mentioned, - if they can do it on a tiny payload
hanging beneath a small helium balloon then it should be possible to do
something similar on a spacecraft even a 1U cubesat!

73

Graham
G3VZV




-----Original Message-----
From: Simon HB9DRV
Sent: Friday, September 07, 2012 2:13 PM
To: 'Graham Shirville' ; 'AMSAT BB'
Subject: [amsat-bb] Re: Fw: Digital Slow Scan in space

Graham,

What's 'medium resolution' ? Standard SSTV is not digital, it's analogous
with the (now no longer used) analogue TV. There is true digital SSTV used
on 80m and 40m and (I guess) other bands, from memory this is EasyPal; to
implement this in a satellite would be a long and tedious task.

Implementing one of the analogue SSTV modes would be easier - much easier
-
but quality is nowhere as good.

Simon Brown, HB9DRV
http://sdr-radio.com

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Graham Shirville

We are looking for a practical system to use on a 1U, or perhaps 2U,
cubesat
to take medium definition images and transmit them to the ground on VHF
for
educational outreach purposes.

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