[PSUBS-MAILIST] coms

Mon Dec 16 18:10:14 EST 2019

500 feet of coax would also have horrendous feed losses @ Vhf frequency. Best would be to put the radio inside the bouy with a fiber optic cable link from the sub. That would eliminate feedline and other losses.
Keith T.K6FEE 
-------- Original message --------From: Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> Date: 12/16/19  1:48 PM  (GMT-08:00) To: Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> Subject: Re: [PSUBS-MAILIST] coms 

        I think the first thing we need to determine is whether 500 feet of cable is too long for VHF transmission.  Also, what effect coiling of the cable would have since in some situations coils of cable are used as baluns.
Jon

                    On Monday, December 16, 2019, 04:11:01 PM EST, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

        Jon, I was thinking about VHF radio with a 500 plus foot antenna cable to the antenna on the surface.  Then a matching radio on the boat.Don't think smoke will be reliable under water hahaHank

                    On Monday, December 16, 2019, 11:22:19 AM MST, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

        More info Hank.  What kind of comms?  Are you wanting to tether ultrasonic comms, some kind of radio like CB, smoke signals?  
Jon

                    On Monday, December 16, 2019, 10:31:45 AM EST, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

        Alan, good plan, but I am sure someone here has ideas.  I am only needing to go 500 feet for my project this summer, so I will start with that and then I can just add to the line as needed.Hank

                    On Monday, December 16, 2019, 7:34:13 AM MST, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

                Hank,If you don't get a response here, I would join a ROV group & post on one.They would have that stuff down to a fine art.I have searched ROV group information before.How deep are you wanting to go?Alan

On 17/12/2019, at 2:51 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi All,I am in need of guidance.  I want to install coms in E3000 with a tether cable.  I can get 4mm ROV tether at a reasonable cost.  I always tow a buoy anyways.  I need help to figure out how to do this. Hank_______________________________________________
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