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  #11  
Old 03-14-2013
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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.
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  #12  
Old 03-14-2013
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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.
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  #13  
Old 03-14-2013
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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?
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  #14  
Old 03-14-2013
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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 09:09 PM.
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  #15  
Old 03-15-2013
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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.

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  #16  
Old 03-15-2013
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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.
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  #17  
Old 03-15-2013
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Re: Weatherfax audio file for testing

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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.
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  #18  
Old 03-15-2013
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Re: Weatherfax audio file for testing

..... might be something for Sirius-XM radio to consider, huh?
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  #19  
Old 03-15-2013
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Re: Weatherfax audio file for testing

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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.
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Old 03-15-2013
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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
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