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Author Topic: New member, also brand new to this area of interest  (Read 1829 times)
malwurst
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« on: January 28, 2008, 03:31:52 PM »

Greetings,
As you can see by the topic line, I'm brand new to this area of interest and really don't have a clue how to get started. I'm a very non technical sort of person (plug it in and let 'er rip) is about my level of technical expertise. However, I do have a Uniden ubc72xlt hooked up to a Discone antenna (normally used for listening to aircraft, etc) and am wondering if this would be satisfactory to get started? That's obviously the first question with more questions to come if the answer is yes. If the answer is no, then I guess that ends my involvement and I go back to listening to aircraft, police, etc Smiley
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« Reply #1 on: January 28, 2008, 09:42:51 PM »

In short, the answer is Yes.  With some caveats.

You will need to modify your radio (usually requires soldering) so that you can feed the sound into your PC's sound card.  Basically you need to grab the signal before the radio circuitry "cleans" up the signal, this is called a discriminator tap.

This site has some great info if you are interested.  I did a quick google search for you model and didn't come up with much.

If you think you could modify it, let us know and we can give you the info on where to go from there.

If you would prefer to not have to tie up your radio, you could also buy a SR-161 type AIS receiver and that will plug straight into the com port on you PC.  It's the easiest method. (But they run about $190 US)

I am also trying to work on a "build at home" type project that people could build themselves.  It's a slow project, but one I plan on finishing.   Huh

Anyway, good luck and let us know if you need anymore help,

Aric
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malwurst
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« Reply #2 on: January 28, 2008, 10:48:34 PM »

Ta muchly for your reply. The 72xlt already has a discriminator tap in the back of it. I bought it from someone on the NZScanners forum who had already modified it... although I didn't have a clue what the discriminator tap was for!
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« Reply #3 on: January 29, 2008, 05:31:06 AM »

Well, that's what it is for.   Smiley

Getting the unprocessed audio signal.  You will need to feed that signal from the radio into your mic or aux in jack on your sound card.

You can download the shipplotter software and use the audio processing feature of the software to decode any AIS data and the program will then upload the data to the server.

There is a How to on setting up the software to work with this site.

Hope all this helps you in the right direction,

Aric
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malwurst
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« Reply #4 on: January 29, 2008, 10:41:36 AM »

Does it make a difference at all as to whether either stereo or mono cable is used to hook the receiver to the pc?
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« Reply #5 on: January 29, 2008, 02:43:53 PM »

I believe that it would depend on how the radios line out jack is setup.  I would use stereo to be safe.  I "believe" that would take the signal from either connection on the internal of the jack.

Aric
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malwurst
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« Reply #6 on: January 29, 2008, 11:00:55 PM »

Ta muchly for that. Well, I guess my next step is to see if I can actually hear anything on the frequencies.
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« Reply #7 on: January 30, 2008, 08:42:55 AM »

Keep in mind, that you may not actually hear anything.  The first time I hooked a scanner up with a discriminator tap, I could only hear a faint little static break every 10-15 seconds.  If I didn't know to listen for that I would have just thought it was static interference.

Once I hooked it up to the PC, every time I heard a little break, an AIS message showed up on the screen.

Pretty neat.

Just wanted you to know what to expect.

Aric
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malwurst
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« Reply #8 on: January 30, 2008, 10:47:06 AM »

Ok, I'm getting no signal at all showing up on shipplotter. That, along with the fact that I'm also having difficulty decoding vhf acars with the scanner, tends to make me think I need a mono cable rather than a stereo one. Please correct me if you think I'm wrong?
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« Reply #9 on: January 30, 2008, 06:54:17 PM »

Can't hurt to try.   Smiley
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malwurst
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« Reply #10 on: February 02, 2008, 03:39:48 PM »

It would appear that the 72xlt doesn't handle such signals very well, at least judging by the signal output in shipplotter. Instead of nice smooth curves, as outlined in the shipplotter manual, I get sharp jagged spikes. I was afraid of this kind of result since the 72xlt is really only a very low-end scanner.
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« Reply #11 on: February 03, 2008, 10:53:34 AM »

You could always replace or add to your setup with a cheap dedicated AIS receiver.  Most use the Sr 161 by www.milltechmarine.com but I hear if you want to keep cost down the Nasa AIS engine might be a good solution.  I use the Sr 161 but will upgrade to a true dual channel SR 162 soon.

Cheers,

Chris
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malwurst
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« Reply #12 on: February 06, 2008, 11:10:52 PM »

Looks like I was wrong in thinking the 72xlt can't handle it. Since I wrote that I have had success in picking up several ships on the few occasions when I've switched to those frequencies. It does look like it will take me quite a long time to get to grips with the actual shipplotter prgm though. Reading through the pdf manual left me kinda shell-shocked. Lot of terms I've never heard of let alone know what they mean.
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« Reply #13 on: February 07, 2008, 11:18:36 AM »

Yes, it can take some time to get used to SPlotter.  I was very confused when first starting out, especially since I too was trying to use an analog signal through the mic in jack on my sound card.  I remember not knowing what to listen for, and whether or not I had all the settings correct.

If you have any questions, I am pretty good with it these days, just ask!

Aric
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malwurst
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« Reply #14 on: February 20, 2008, 12:58:43 AM »

It appears that the online map setup isn't working. I carefully followed all instructions for setting up, got a map ID 60, set up Shipplotter to upload, came back to shipplotter.com to see the map and was told that I didn't have a map set up. Also none of the links on that page - the one that told me I didn't have a map set up - work.
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malwurst
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« Reply #15 on: February 29, 2008, 02:03:29 PM »

I assume this site is dead since there has been no reply to my last post?
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« Reply #16 on: March 07, 2008, 07:30:32 AM »

I'm sorry I have been really busy on another project.  The site is very alive.  I am looking into redo part of the setup on the site.

If you are using the shipplotter software, the map number, should be the number in the about page between the curly braces i.e. {20224} or {2093b}.  If you are using our software, then you can enter what ever you like, just make sure it matches.  And you have to enter it in the website first, then in your software, since the software verifies the number.

Other than that, make sure you have sharing enabled every time you start the software.  It's the little blue icon, with arrows pointing in opposites.  I can't tell you how many times I forget that one.  So I'm not trying to sound mean.  I just forget it a lot myself.

Let me know if that helps.  If not, take a snapshot of you screen and post it here, and one of your settings.  I could look into the database then and verify you have everything setup correctly.

Sorry for the delay on replying.

Aric
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