Weatherfax audio file for testing - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest > General Discussion (sailing related)
 Not a Member? 


Like Tree5Likes
Reply
 
LinkBack Thread Tools
  #11  
Old 03-14-2013
SVAuspicious's Avatar
Mermaid Hunter
 
Join Date: Oct 2006
Location: on the boat - Chesapeake
Posts: 3,271
Thanks: 0
Thanked 96 Times in 85 Posts
Rep Power: 8
SVAuspicious will become famous soon enough
Re: Weatherfax audio file for testing

Quote:
Originally Posted by tombesore View Post
You inspired me to do my own little test this morning. I found that I was receiving solid signals (S9+20db) from the 4Kilowatt NMG New Orleans Coast Guard transmitters during their morning run of WEFAX transmissions. The image below was received through a modern HF amateur radio transceiver and fed into the Multimode for Mac program. The frequency was 8502 kHz USB.
Hi Tom,

That's pretty fuzzy. I rarely see anything that bad. Icom 802/AT140/SCS PTC-IIpro/Airmail-GetFax I was getting near-Internet quality pictures from Boston well East of Azores. Up and down the US East Coast I get Boston and New Orleans really well.

I've had similarly good results using a Kaito 1103 and JVCOMM32 with a big hunk of copper wire hauled up as high as possible. The antenna makes a big difference.

Did you collect your signal aboard the ferry at your club? Could there be interference from being at the dock or even from internal systems? On delivery I've had a number of noisy boats that required shutting systems down to get a good fax image -- obviously a pain if you're shutting down refrigeration for a six hour wefax cycle.
__________________
sail fast and eat well, dave
S/V Auspicious
AuspiciousWorks.com
beware "cut and paste" sailors.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #12  
Old 03-14-2013
tombesore's Avatar
WindyCitySailor
 
Join Date: May 2011
Location: Chicago
Posts: 18
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 0
tombesore is on a distinguished road
Re: Weatherfax audio file for testing

As for that fuzzy signal, I am wondering if I had the greyscale option selected instead of b/w. The signal was strong and noise is minimal. The antenna is a 140' long Windom stretched between the ship's mast.

I'll give it a try again and hope for better results .... also using the tuning tweaks suggested earlier in this thread. Thanks for the suggestions.
Reply With Quote Share with Facebook
  #13  
Old 03-14-2013
smurphny's Avatar
Over Hill Sailing Club
 
Join Date: Feb 2009
Location: Adirondacks NY
Posts: 2,853
Thanks: 55
Thanked 63 Times in 61 Posts
Rep Power: 6
smurphny is on a distinguished road
Re: Weatherfax audio file for testing

Quote:
Originally Posted by tombesore View Post
You inspired me to do my own little test this morning. I found that I was receiving solid signals (S9+20db) from the 4Kilowatt NMG New Orleans Coast Guard transmitters during their morning run of WEFAX transmissions. The image below was received through a modern HF amateur radio transceiver and fed into the Multimode for Mac program. The frequency was 8502 kHz USB.

As you can see, the image is fair at best, even with a very solid S9 signal and modern reception gear. This is typical of the images I've been able to pull in. The pics are fair at best and most of the time I can barely make out the notations.

Has anyone else had better luck pulling in higher quality pictures over HF? Let's see what you got!

By the way, I also set my iPad next to the speaker with that BlackCat Wefax program running and, while the same image did appear on the iPad, it was far worse quality!

WEFAX Image
That's fairly distorted. I sometimes get similar results if I forget to turn off equipment like the converter. It looks like interference. Have you tried ferrite beads on cables? What kind of counterpoise?
__________________
Alberg 35: With a philosophical flourish Cato throws himself upon his sword; I quietly take to the ship.
Reply With Quote Share with Facebook
  #14  
Old 03-14-2013
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,840
Thanks: 9
Thanked 75 Times in 68 Posts
Rep Power: 15
RichH will become famous soon enough
Re: Weatherfax audio file for testing

Quote:
Originally Posted by tombesore View Post
As for that fuzzy signal, I am wondering if I had the greyscale option selected instead of b/w. The signal was strong and noise is minimal. The antenna is a 140' long Windom stretched between the ship's mast.

I'll give it a try again and hope for better results .... also using the tuning tweaks suggested earlier in this thread. Thanks for the suggestions.
Try aligning your antenna to straight vertical as much as possible ... horizontally polarized antennas are subject to pick up a lot of 'noise' from automotive type spark ignition engines and are highly insensitive to signal coming in at the 'ends' ... better to be 90° from the broadcast origin; vertical antennas seem at times to better dampen out such automotive induced background noise and are more omnidirectional.

Last edited by RichH; 03-14-2013 at 08:09 PM.
Reply With Quote Share with Facebook
  #15  
Old 03-15-2013
jackdale's Avatar
Senior Member
 
Join Date: Dec 2008
Location: Calgary, AB, Canada
Posts: 8,861
Thanks: 26
Thanked 37 Times in 34 Posts
Rep Power: 6
jackdale will become famous soon enough
Re: Weatherfax audio file for testing

Quote:
Originally Posted by SVAuspicious View Post

I've had similarly good results using a Kaito 1103 and JVCOMM32 with a big hunk of copper wire hauled up as high as possible. The antenna makes a big difference.
Tell me about that "big hunk of copper wire".

I am thinking about a similar setup to use on my trips around Vancouver Island. Few of the boats have SSB.

Jack
__________________
__________________
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203, 204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
Reply With Quote Share with Facebook
  #16  
Old 03-15-2013
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 8,967
Thanks: 10
Thanked 135 Times in 121 Posts
Rep Power: 6
Minnewaska will become famous soon enough Minnewaska will become famous soon enough
Re: Weatherfax audio file for testing

I don't understand why no one has made a patch cable and software that will connect an iPad directly to a Pacor modem. Getting weather over SSB is ridiculously complicated for the 21st century.
rockDAWG likes this.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Reply With Quote Share with Facebook
  #17  
Old 03-15-2013
smurphny's Avatar
Over Hill Sailing Club
 
Join Date: Feb 2009
Location: Adirondacks NY
Posts: 2,853
Thanks: 55
Thanked 63 Times in 61 Posts
Rep Power: 6
smurphny is on a distinguished road
Re: Weatherfax audio file for testing

Quote:
Originally Posted by Minnewaska View Post
I don't understand why no one has made a patch cable and software that will connect an iPad directly to a Pacor modem. Getting weather over SSB is ridiculously complicated for the 21st century.
It does seem pretty archaic but I guess the population that uses hf is not big enough to spur tech geeks to do much research and invention. With satellite communication now available (for those who can afford it), I think HF will eventually be replaced. Once more companies get more satellites up there, maybe there will be some real competition to reduce the price of satellite links. Once every-day mobile devices go to satellite signals instead of land towers it should bring the cost down and supply reliable and clear signals to boats anywhere on the planet.
__________________
Alberg 35: With a philosophical flourish Cato throws himself upon his sword; I quietly take to the ship.
Reply With Quote Share with Facebook
  #18  
Old 03-15-2013
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,840
Thanks: 9
Thanked 75 Times in 68 Posts
Rep Power: 15
RichH will become famous soon enough
Re: Weatherfax audio file for testing

..... might be something for Sirius-XM radio to consider, huh?
Reply With Quote Share with Facebook
  #19  
Old 03-15-2013
美国华人, 帆船 教授及输送
 
Join Date: Sep 2006
Location: MD
Posts: 2,451
Thanks: 22
Thanked 20 Times in 12 Posts
Rep Power: 9
rockDAWG is on a distinguished road
Re: Weatherfax audio file for testing

Quote:
Originally Posted by tombesore View Post
rockDAWG,

Here's a link to a sample audio file. It's a 24 Hour Surface Forecast WEFAX image transmitted by the US Coast Guard transmitters NMG on 8502kHz this morning around 7:30am central time. With this seemingly strong audio, my decode was readable but only marginal quality.

https://archive.org/download/WEFAXFi...20File%201.wav
Hey Tombesore,

Thanks for taking time to capture the sound file for me. I play it with iPAD just out of the computer speaker or headphone. THe weather chart is very distorted. In other words, it works. But need to obtain a better quality sound input for iPAD.
__________________

Fine Print:
I am old school. Integrity is to do the right thing even when no one is watching.
Reply With Quote Share with Facebook
  #20  
Old 03-15-2013
美国华人, 帆船 教授及输送
 
Join Date: Sep 2006
Location: MD
Posts: 2,451
Thanks: 22
Thanked 20 Times in 12 Posts
Rep Power: 9
rockDAWG is on a distinguished road
Re: Weatherfax audio file for testing

Quote:
Originally Posted by Minnewaska View Post
I don't understand why no one has made a patch cable and software that will connect an iPad directly to a Pacor modem. Getting weather over SSB is ridiculously complicated for the 21st century.
Exactly, 10x
Actually, Black Cat has address this.



iPad / iPhone / iPod Touch Microphone Adapter Wiring Diagram

The also posted another source - ready made solution. So I will look into it to see if it will work.

iPhone 1/8 inch line-level audio input adapter - 3.5mm 4 conductor TRRS Male to 3.5mm TRS Microphone Input Jack with built-in Attenuator
__________________

Fine Print:
I am old school. Integrity is to do the right thing even when no one is watching.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Weatherfax frequencies davejq Gear & Maintenance 4 02-13-2010 11:20 AM
Help with WeatherFax and SeaTTY desierto Gear & Maintenance 4 12-05-2008 01:45 PM
Whne having trouble with file formats, save the file in a RTF (RichT NewsReader Mass Bay Sailors 0 05-21-2006 10:15 AM
e-mail / weatherfax? richardrhatigan General Discussion (sailing related) 2 07-27-2005 08:25 AM
ssb/weatherfax/pc based Navigation chuck711 Cruising & Liveaboard Forum 2 01-12-2003 03:15 PM


All times are GMT -4. The time now is 08:39 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.