RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > HF / MW / LW Monitoring > Shortwave Data Decoding


Shortwave Data Decoding - Discussions regarding decoding digital signals on the HF bands, including HFDL, ALE, RTTY, CW, and others.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 06-28-2017, 7:04 PM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2017
Location: Parkside, PA
Posts: 6
Exclamation sync problems hf wefax

For quite a while now I have had problems with the NOAA hf wefaxs jumping sync. I thought it was my setup,
but calibration with wwv (using JVCom32 here) kept a straight line for an hour. I finally checked the fax
reception using another computer and rx simultaneously. The sync discontinuities exactly matched on both units. Finally sent an e-mail to noaa. They admitted to "technical difficulties". Some of the faxes were so garbled they were unusable. Wonder how fishing boats and such at sea aren't really p.o.ed.?

Eric WA3UYI
Reply With Quote
Sponsored links
  #2 (permalink)  
Old 09-12-2017, 9:05 AM
Member
   
Join Date: Sep 2017
Location: Kilgore, Ohio
Posts: 11
Default

I'm having the same problem with the Boston & New Orleans stations, glad someone found out the problem. I thought I had a problem with my computer.

Allen
Reply With Quote
  #3 (permalink)  
Old 09-15-2017, 5:52 PM
me1900's Avatar
Member
   
Join Date: Jan 2017
Posts: 107
Default

Oh wow I thought it was FLDigi screwing up. I too see the mess.
Reply With Quote
  #4 (permalink)  
Old 09-18-2017, 2:41 PM
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Aug 2015
Location: Charlottesville, VA, USA
Posts: 9
Default

Is this what you all are seeing? This is Fldigi 4.0.1 on OS X 10.12, RXing from 9108.100 (nominally 9110)
Attached Images
 
Reply With Quote
  #5 (permalink)  
Old 09-19-2017, 8:49 AM
Member
   
Join Date: Sep 2017
Location: Charles Town, WV
Posts: 10
Default

Can someone tell me how often this issue is happening? I am the person who works directly on this for NWS and joined this forum to get a better understanding of the frequency of this issue every day from the user community.

Thanks
Reply With Quote
Sponsored links
  #6 (permalink)  
Old 09-19-2017, 9:38 AM
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Aug 2015
Location: Charlottesville, VA, USA
Posts: 9
Default

For me this happened all day yesterday. Haven't seen a transmission out of Boston yet this AM. OS2 Martinez from USCG CAMSLANT had good signal, but could replicate the issue yesterday per her email reply to me.

NOLA this morning on 8502.00 actual (8503.9 nominal) is doing this as of 0943 hrs EDT (1343 UTC)

Also, to help with debugging:
* Have tried this with FLDigi 4.0.1, FLDigi 3.23.13, and MultimodeCocoa 6.8.0. All jump at the same point, which tells me something before the computer is the issue.
* Receiving on a Yaesu FT-897D with SignaLinkUSB

Last edited by kk4jfj; 09-19-2017 at 11:36 AM..
Reply With Quote
  #7 (permalink)  
Old 09-19-2017, 10:18 AM
Member
   
Join Date: Sep 2017
Location: Charles Town, WV
Posts: 10
Default

Ok she just replied to me at 9:38AM ET and told me there were no issues from when she talked to me yesterday about 4:15PM ET and the time she sent me the email.

We are trying to isolate where the problem resides as we have ability to get them the charts on multiple paths for the dissemination over the radio bands.
Reply With Quote
  #8 (permalink)  
Old 09-19-2017, 12:42 PM
Member
   
Join Date: Sep 2017
Location: Charles Town, WV
Posts: 10
Default

Not sure why the messages I am sending are not showing up even after multiple hours but...

We are trying to isolate where the issue is but the USCG folks have said there are no issues with the images on their end since last night about 4:15 Eastern.
Reply With Quote
  #9 (permalink)  
Old 09-19-2017, 1:32 PM
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Aug 2015
Location: Charlottesville, VA, USA
Posts: 9
Default

Thanks, I appreciate it. More testing fwiw:

Trying this with a different radio and sound card with similar results

Drake R8A => MacPro 2008 line In on 6340 nominal (Boston) and 12750 nominal (Boston) have a strong signal, but getting the stepping occurring still. Tuning to 1.9kHz below the named band per the instructions (http://www.nws.noaa.gov/os/marine/rfax.pdf)
Reply With Quote
  #10 (permalink)  
Old 09-19-2017, 3:40 PM
DJ11DLN's Avatar
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Mar 2013
Location: Mudhole, IN
Posts: 1,296
Default

Quote:
Originally Posted by jhildreth View Post
Not sure why the messages I am sending are not showing up even after multiple hours but...

We are trying to isolate where the issue is but the USCG folks have said there are no issues with the images on their end since last night about 4:15 Eastern.
New users posts are subject to moderation. After you post a few more times they will show up immediately.
__________________
If it looks stupid but it works...it ain't stupid.
Reply With Quote
  #11 (permalink)  
Old 09-19-2017, 6:38 PM
Member
   
Join Date: Sep 2017
Location: Charles Town, WV
Posts: 10
Default

Ok... so for those checking the HFFax radio broadcast can you tel me if this issue has ceased? We made a change to where the USCG receives the data at about 4pm eastern or so.
Reply With Quote
  #12 (permalink)  
Old 09-20-2017, 7:57 AM
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Aug 2015
Location: Charlottesville, VA, USA
Posts: 9
Default

10:47PM EDT copy from 9.108.1 shows the problem persisting. This was received with the Drake R8A into the sound card
Attached Images
 
Reply With Quote
  #13 (permalink)  
Old 09-20-2017, 10:49 AM
Member
   
Join Date: Sep 2017
Location: Charles Town, WV
Posts: 10
Default

Thanks...we are working with the USCG to figure out where the issue is since they did switch to receive from our second data center.
Reply With Quote
  #14 (permalink)  
Old 09-20-2017, 10:50 AM
Member
   
Join Date: Sep 2017
Location: Charles Town, WV
Posts: 10
Default

One other thing...can you tell me when this issue started? We are trying to figure that out to see if either USCG or us did something at the time this started which may have caused the problem.
Reply With Quote
  #15 (permalink)  
Old 09-20-2017, 11:42 AM
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Aug 2015
Location: Charlottesville, VA, USA
Posts: 9
Default

Was able to copy from Pt. Reyes around 11:30 EDT (1530UTC) on the Drake. It does not have this problem (only a few sections out of sync) but it was a relatively weak signal for me.

Tried to copy Kodiak per the published list at 1540UTC (1140 EDT) but couldn't get a read on anything.
Reply With Quote
  #16 (permalink)  
Old 09-20-2017, 11:46 AM
Member
   
Join Date: Sep 2017
Location: Charles Town, WV
Posts: 10
Default

Kodiak is not within our office at this point. THey disseminate out of AK where the three in the continental US are from our facilities in CO and MD.
Reply With Quote
  #17 (permalink)  
Old 09-20-2017, 12:33 PM
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Aug 2015
Location: Charlottesville, VA, USA
Posts: 9
Default

The first poster discussed having seeing this for a while in late June of this year. The other two indivduals commented within the last week or so. (12 sep, 15 Sep)

W7HD posted about WEFAX on the 16th to a linux ham group and I started playing with it at that point. I have not had an image come across correctly. When I started troubleshooting, I found this thread. This seems to be the only place anyone else has had a sync issue along these lines that I can find.

Here's the Point Reyes copy (below the clear piece at the top). there's some sync jumping, but nothing along the lines of the Boston/NOLA issue.
Attached Images
 

Last edited by kk4jfj; 09-20-2017 at 12:40 PM..
Reply With Quote
  #18 (permalink)  
Old 09-20-2017, 12:52 PM
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Aug 2015
Location: Charlottesville, VA, USA
Posts: 9
Default

Here's the discussion on LinuxHam:
https://groups.io/g/linuxham/topic/6031647#35203

The Fldigi developer and another operator are also replicating these issues with multiple decoders.
Reply With Quote
  #19 (permalink)  
Old 09-20-2017, 12:59 PM
Member
   
Join Date: Sep 2017
Location: Charles Town, WV
Posts: 10
Default

Alright I may be not here all the time posting but we are looking into the issue and if you want to post this fact in the other forum that is fine....this is now an issue being seen by management so we are trying to get to a resolution as quickly as possible.
Reply With Quote
  #20 (permalink)  
Old 09-20-2017, 1:10 PM
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Aug 2015
Location: Charlottesville, VA, USA
Posts: 9
Default

Thank you! I appreciate it. Please let me know if there's any additional testing we can provide (or if you'd like us to capture audio from the receivers etc)
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 6:31 AM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2017, 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