What's the trick with the JW Fishers Pulse 12?

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #10 on: January 31, 2009, 02:06:04 am »

Hello Rip,

thanks for this posting! My original impressionwas also that all the electronics are housed inside the control box and that there's nothing inside the fish. I was just going to buy a 2nd hand unit on eBay for studying it but got outbid. The Ousle 12 is available with 150 or 300 ft I think and 500ft capability. However for the 500ft they charge an extra USD 4000.00 depth capability expense. Now if nothing is inside the towfish, I assume it is just a signal enchancer as Cornelius had suggested?

Regards,

Christian

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #11 on: January 31, 2009, 03:46:30 am »

Hi Christian,

I think you are right. They probably have some added electronics with the 500 foot option. I sent an email to the owner of the one I saw. But, unless he is working this weekend, I doubt I will find out anything before Monday.

The PI I built using the board I bought from Eric Foster, used a 1 meter square coil on skids. I used 100 feet of Belden 9913F7 cable to feed it. I did not make any changes to the circuit as a result of the cable. But, I was not using it for small objects. I also had an 18" round drop coil that I used a generic RG-8/U coax on. It was 50 feet and I used it to locate a small pocket knife and several small hand guns over the years.

HH,
Rip

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #12 on: February 03, 2009, 04:55:13 am »

Hello Rip,

thanks for teh update! I hope taht your friend can elighten us! I am really curious what's the trick behind it.

Best wishes,

Christian

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #13 on: February 03, 2009, 06:09:09 am »

RG-11 Messenger Cable might be an option . It is not expensive , it is very low signal loss , like 1 db per 1000 ft at low frequencies and the steel messenger on the cables jacket is super strong , if used for towing !! . I think the Cable definitely must be flexible and shielded ...........You do have options ......this good project idea to increase the distance , might be very rewarding for you too !! ..........I am also interested now to find out exactly what size coax is currently being used on these PI Detectors.........Thanks...........Eugene52

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #14 on: February 03, 2009, 12:38:50 pm »

Getting Closer !! If you read the 2nd page of the file I posted here , They use a "coax with a multi-pair stranded wire" encased inside a rope !! So , just three requirements 1. the coax center-conductor must be stranded , and the entire coax must be very flexible . 2. All cables and coax must be the "Flooded" type which helps prevent corrosion . 3. The connectors must be 100% waterproof .........So go out and buy the 1000 foot roll and then solder your connectors and do your testing of the camera and your P.I. metal Detector . If it passes the test at 1000 foot length , you know 500 feet will work perfect !!...................Regards..............Eugene52

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #15 on: February 04, 2009, 11:43:07 pm »

My friend got a chance to look at his towfish yesterday. He said that he does not see any wire going into the body of the towfish. He also did not find any numbers on the cable. He said it is between 1/4 and 1/2 inch but he did not have a way to measure it with him.

HH,
Rip

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #16 on: February 24, 2009, 11:52:45 am »

I've got some news on the Pulse 12: There's currently one for sale on eBay and it looks like the electronics are actually inside the Fish ?!

What do you make of these pictures?

Maybe it is just the case for the deepwater model with an extra long cable?

Regards,

Christian

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #17 on: February 24, 2009, 12:42:09 pm »

I think there is a circuit board in the plug/connector I pictured ? Does it plug into the towfish ? What is in the Yellow plug ? I thought the long tow-fish was a semi-hollow buoyancy device that is kind of Empty !! I think most of the electronics are in the big Control unit ? All of this can be built , and with a better P.I. system !!
Great

......................Eugene52

If someone owns this towfish , simply take the screws off the top panel of the control box and look inside , then post a clear digital picture , we will then know in less than 5 minutes how this system is designed !!!! Then we can solve problems here , like what types of cable and the maximum cable length distance you can use . Also maximum detection range of the Pulse Induction itself . Complete Tow-fish Photos are very welcome here !! Waveing

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #18 on: February 24, 2009, 03:08:49 pm »

You can carry very small signals over long cable lengths, but they will need more amplification. A good shielded cable will protect the wanted signal from external noise sources, but the amplifier circuit will need to be very low noise too. I know there are tricks you can do, where you feed a signal into the shield, increasing its effectiveness. One thing to be sure of, is that the cable is low capacitance as well as low resistance, fast edges of the signals will contain harmonics going into the MHz region. High frequencies will see the capacitance as a low resistance, degrading the signal.

Best idea is to try it if doesn't cost a fortune. If it doesn't work, then you may need a head amplifier in the towed section, to bost the signal. The power can be carried over the same coax as the signal (think satelite dish receivers power supplies).

Colin

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #19 on: February 24, 2009, 04:39:08 pm »

	Quote:	Posted by colin324
You can carry very small signals over long cable lengths, but they will need more amplification. A good shielded cable will protect the wanted signal from external noise sources, but the amplifier circuit will need to be very low noise too. I know there are tricks you can do, where you feed a signal into the shield, increasing its effectiveness. One thing to be sure of, is that the cable is low capacitance as well as low resistance, fast edges of the signals will contain harmonics going into the MHz region. High frequencies will see the capacitance as a low resistance, degrading the signal. Best idea is to try it if doesn't cost a fortune. If it doesn't work, then you may need a head amplifier in the towed section, to bost the signal. The power can be carried over the same coax as the signal (think satelite dish receivers power supplies). Colin

Hello colin324 and welcome to the Great Thunting.com Forum !!! You are correct . If you use the proper diameter coax cable a "TX" transmitted Vlf or Pulsed signal can travel several thousand feet !! The only problem is the RX or return signal will not make it back unless it is AMPLIFIED or Boosted !!! There are options......# 1. Having the Metal Detector unit built in the Towfish , but the search coil must be placed out of the detectors range or use a more directional Search coil then the audio signal only can be sent to the surface . The batteries can even be at the surface . OR #2 . Like you said have all electronics on the ship and just boost the RX signal back up. There are options !!.......Best Regards...............Eugene52

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