[AR] Re: Narrow Band TV
- From: "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Fri, 07 Feb 2014 16:48:44 -0700
Not true? Is so true! Ken this is not NBTV that is a fast scan video.
ATV is FSTV or SSTV this is a NBTV broadcast.
http://www.qsl.net/zl1wtt/images/ZL1BPU_outside.mp4
The quality and resolution are quite low but the requited bandwith is
on the order of 2khz rather than several 4-7 Mhz for standard FSTV.
This example is indicative of the process. It can now be done in
software in real time. In the old days when NASA did it they had a
camera pointing onto a special screen that had long lasting phosphor.
The NASA footage of the moon landing was 320 lines of resolution at 10
FPS this modern method of NBTV is mor3 like 48 lines of resolution.
There was a mechanical type of television in the beginning of TV and it
was 32 lines of resolution but this is a mechanical process.
http://www.youtube.com/watch?v=92dN2G5-D4c
Too sum up here is my friend fsphil transmitting and receiving live
NBTV using a Raspberry Pi and a SDR Radio.
https://www.youtube.com/watch?v=TGgmCiJ9iEM
The quality of NBTV is much lower as you can see but still useful and
can be transmitted much farther. The resolution may not be sufficient
for you. If you need narrow bandwith this is what you can use.
Monroe
> -------- Original Message --------
> Subject: [AR] Re: Narrow Band TV
> From: KEN BIBA <kenbiba@xxxxxx>
> Date: Fri, February 07, 2014 12:24 pm
> To: arocket@xxxxxxxxxxxxx
>
>
> Not true.
>
> Here is a 70cm SSTV off an amateur rocket.
>
> http://www.youtube.com/watch?v=jd-BMFeC_IQ
>
> Off the shelf equipment.
>
> K
>
> On Feb 7, 2014, at 3:17 AM, Monroe L. King Jr. <monroe@xxxxxxxxxxxxxxxxxx>
> wrote:
>
> > NBTV is not quite SSTV and not quite fast scan TV it has a framerate of
> > about 6-15 fps and SSTV takes much longer per frame on the order of half
> > a minute.
> >
> > Monroe
> >
> >> -------- Original Message --------
> >> Subject: [AR] Re: Narrow Band TV
> >> From: Aplin Alexander T <ATAPLIN@xxxxxxxxxxxxxxxx>
> >> Date: Fri, February 07, 2014 3:34 am
> >> To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
> >>
> >>
> >> Classification: Unclassified
> >>
> >>
> >>
> >> Note the A11 video we've all seen is much poorer than it would be today,
> >> due to the technique used for A to D conversion back then (pointing a
> >> camera at a monitor). Unfortunately the original digital tapes are
> >> missing, presumed wiped:
> >>
> >> http://en.wikipedia.org/wiki/Apollo_11_missing_tapes
> >>
> >>
> >>
> >> A bit more technical detail here (radio hams still use SSTV):
> >>
> >> http://en.wikipedia.org/wiki/Slow_scan_TV
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> Alex Aplin
> >>
> >>
> >>
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> >>
> >>
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