[PSUBS-MAILIST] OTS and motor controller noise

[James Frankland via Personal_Submersibles]

Yes, thats the one I have.

On Mon, 28 Apr 2025 at 21:15, Jon Wallace via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi James,
>
> Very interesting.  You've got the SP-100D2 Buddy Phone, correct?
>
> Jon
>
>
>
> On Monday, April 28, 2025 at 03:51:14 PM EDT, James Frankland via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi Jon
>
> I had this exact thing with mine.  I ran it initially with main power from
> the boat.  But the noise\interference from other things (cant remember
> what) made it hopeless.  I just did away with plugging it into the main
> power and used AA batteries in the unit.
>
> I also did the transducer the same as you.
>
> Once i switched to the internal standard AA batteries, i have no problems.
>
> Kind Regards
> James
>
> On Mon, 28 Apr 2025 at 14:47, Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hey folks,
>
> My OTS STX-101 receiver is picking up some fairly significant and annoying
> electronic noise from my Roboteq PWM motor controllers.  I tried changing
> channels on the OTS hoping a different frequency might help but it didn't.
> I also tried changing the controller PWM frequency between a range of 10khz
> and 24khz but nothing between those frequencies made a significant
> improvement.  The noise is enough to override the normal squelch setting
> but at the same time a strong communication signal through the OTS
> transducer is enough to override the noise.
>
> My configuration has the transducer outside the hull and receiver inside
> the hull which required cutting the cable.  I potted the cable in a
> thru-hull and reconnected the cable inside the cabin with RG-58 SMA
> connectors (soldered, not crimped).
>
> In talking with a couple other folks it seems I am not alone in this
> experience.  Some others have found that using local batteries instead of
> tying into the same batteries used by the motors has significantly reduced
> the noise, however in my case I am already using a separate battery
> isolated from the motor batteries.  Another choice that has seemed to make
> a difference is mounting an SB-1001 outside the hull and running the
> headset wires through the hull instead.
>
> Anyone else have similar experiences with OTS?
>
> Jon
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20250429/4b820642/attachment-0001.html>