Re: [digitalradio] Digital high frame rate video via amateur radio

2007-12-15 Thread John B. Stephensen 
You should be able to use Ethernet video cameras and Wifi on the 13 and 5 cm 
bands.

73,

John
KD6OZH

  - Original Message - 
  From: Andrew O'Brien 
  To: DIGITALRADIO 
  Sent: Saturday, December 15, 2007 18:45 UTC
  Subject: [digitalradio] Digital high frame rate video via amateur radio


  I know that digital voice is really just getting going on ham radio
  when it comes to narrow bandwidth and good codecs. How far off are we
  from a day when we can do digital video and voice, video with perhaps
  a 5 frames a second rate ? Decades ?

  -- 
  Andy K3UK
  www.obriensweb.com
  (QSL via N2RJ)

Re: [digitalradio] Digital high frame rate video via amateur radio

2007-12-15 Thread Rick 
About a year and a half ago, we did some short range testing of medium 
resolution video from an IP camera using 2.4 GHz WiFi. I think it was 
240 lines but I am not for sure on that. It worked in near real time 
with a good signal sent to a laptop from a WAP that was connected to a 
vertically polarized omni directional gain antenna up about 15 feet at 
the base.

The laptop only had the built in antenna so when you got out hundreds of 
feet, the refresh was often quite lengthy and if you went behind a steel 
building there was no throughput at all.

This might have some potential for moderate range video transmissions, 
with serious gain antennas on each end, but since video does require 
quite a lot of speed to get much data through,  it seems that this will 
be limited to special applications.

73,

Rick, KV9U

John B. Stephensen wrote:
 You should be able to use Ethernet video cameras and Wifi on the 13 
 and 5 cm bands.
  
 73,
  
 John
 KD6OZH