RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > Service Specific Monitoring > SATCOM - Space and Satellite Monitoring Forum


SATCOM - Space and Satellite Monitoring Forum - Forum for the discussion of the Space Shuttle, Satellites, Military Satcom, and Amateur Radio Satcom communications.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 02-22-2018, 8:03 PM
VK3RX's Avatar
Member
  Shack Photos
Shack photos
Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Feb 2013
Location: Australia
Posts: 113
Default Operation Deep Freeze 2017/2018?

Anyone heard any of the NZ<>Antarctica flights on SATCOM this season?
__________________
Damien VK3RX
Reply With Quote
Sponsored links
  #2 (permalink)  
Old 02-23-2018, 11:13 PM
VK3RX's Avatar
Member
  Shack Photos
Shack photos
Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Feb 2013
Location: Australia
Posts: 113
Default

Update. Heard comms today on 261.925MHz, around 0330UTC.

Aircraft callsign missed, but heard voice "calling in the blind, looking for 0330 Christchurch weather".

Followed a short time later by a data transmission lasting about 20 seconds. These occurred every half hour, so I assume they were Christchurch weather reports in text.

Finally heard part of aircraft voice comms, but response not heard, which suggests Base Ops may have been operating direct and not via SATCOM?.

Aircraft may be using HF or CPDLC to talk to MAC CENTER.

At 0630UTC heard same type of data transmission on 263.725MHz, the frequency they have used in previous years for voice comms.

Anyone recognise the data mode and/or suggest a program that might be able to decode?
Attached Files
File Type: zip 261925_180224.zip (108.1 KB, 41 views)
__________________
Damien VK3RX

Last edited by VK3RX; 02-24-2018 at 12:34 AM..
Reply With Quote
  #3 (permalink)  
Old 03-03-2018, 3:34 AM
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Apr 2011
Posts: 12
Default

Will keep an eye on it, I haven't heard that particular data sound before. Good catch for this season.
Reply With Quote
  #4 (permalink)  
Old 03-03-2018, 6:09 PM
VK3RX's Avatar
Member
  Shack Photos
Shack photos
Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Feb 2013
Location: Australia
Posts: 113
Default

It sounds like some form of fax or SSTV-type mode, because it sounds like it has a line sync pulse.

I downloaded and registered Multipsk but can't get it going with my Dell desktop's sound card(s). I wanted to use it to analyse a wave file but I can't get the program to do that with its supplied BPSK31 file Messed around for hours trying all sorts of input/output combinations, a loop between the two etc. but gave up in the end. Something to revisit on a rainy day. Fldigi works fine on the PC, but is limited in the modes it can decode.
__________________
Damien VK3RX
Reply With Quote
  #5 (permalink)  
Old 03-03-2018, 9:34 PM
SDRPlayer's Avatar
Member
   
Join Date: Jul 2016
Location: Victoria, Australia
Posts: 91
Default

Damien, i converted those files to .wav and ran them though Multipsk. Those pips are at the 2k mark on the spectrum and the only mode i can get it to trip on is sstv PD290, though this may mean nothing as the signal is pretty noisy. I have also run it though RX-SSTV PD290 with no image. Could try Audacity for a better idea.
Attached Images
 
Reply With Quote
Sponsored links
  #6 (permalink)  
Old 03-04-2018, 12:21 AM
VK3RX's Avatar
Member
  Shack Photos
Shack photos
Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Feb 2013
Location: Australia
Posts: 113
Default

Well done - thanks for that.

As received here the signal wasn't noisy it was S9, so I guess the image is just undecoded data.

It was worth a try
__________________
Damien VK3RX
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 9:31 PM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
All information here is Copyright 2012 by RadioReference.com LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2015 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions