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Hi Jon </div>
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Graham Bayliss here i built Casper 2 she has been kept indoors for quite a few years now as i am to old and lost interest she is ready to go but have lost my will to carry on with her. She cost me £10.000 to build including the trailer. How would you advise
me to go about selling her . Can you help me please i would love to see her finished but i dont have the time or the inclination to see it to the end,</div>
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Regards</div>
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Graham Bayliss</div>
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Isle of man.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Personal_Submersibles <personal_submersibles-bounces@psubs.org> on behalf of Jon Wallace via Personal_Submersibles <personal_submersibles@psubs.org><br>
<b>Sent:</b> 29 April 2025 4:01 PM<br>
<b>To:</b> Personal Submersibles General Discussion <personal_submersibles@psubs.org><br>
<b>Subject:</b> Re: [PSUBS-MAILIST] OTS and motor controller noise</font>
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<div dir="ltr" data-setdir="false">Looking forward to seeing your results David. I can't find a specification for the Minn Kota controller PWM frequency but suspect it is between 10-20khz like most other controllers. I believe Cliff uses the Minn Kota controllers
also and he said he had interference with them.</div>
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<div dir="ltr" data-setdir="false">I connected all my grounds together and it made no difference whatsoever, so I've at least confirmed my battery supplies are isolated.</div>
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<div dir="ltr" data-setdir="false">Jon</div>
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<div>On Tuesday, April 29, 2025 at 12:55:18 AM EDT, David Colombo via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<p dir="ltr">Jon, youve got me thinking on this one. In the VAST, i have the diver unit inside the sub, a continuous non cut cable potted to the thru hull penetrator. The diver unit has its own 6 AA battery pack. With the pair of 36v 101's, and wearing the
headset, i have not had any issues with bleed over noise. I am planning on adding the topside unit inside as a new comms like you. My 101's are controlled by their own minnkota pwm which are on the 36v lipo4 battery pack. The hotel loads are on their own
12v lipo4 battery pack, which is where i plan on connecting the topside unit. I will run a test to see if i can find any signal interferance using the hotel load battery vs its own 2-6v battery pack, and let you know what i find.</p>
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<div dir="ltr" class="x_ydpe0b556e9yiv5404718550gmail_attr">On Mon, Apr 28, 2025, 4:24 PM Alec Smyth via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>>
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<div dir="ltr">I've had mine to 250', but it was inside the sub. That said, the effect on the audio quality was remarkable. It was perfectly clear, but if you ever talked to your friends through a long garden hose as a kid, that was exactly how it sounded.
Which was great, because it made it feel spooky and deep!</div>
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<div dir="ltr" class="x_ydpe0b556e9yiv5404718550gmail_attr">On Mon, Apr 28, 2025 at 4:35 PM Sean T. Stevenson via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>>
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<p dir="ltr">I have had a SSB-2010 a bit deeper than 130 as a diver without flooding the housing, but I don't know how deep it will go without compensation. That limit is the standard recreational diving depth limit for no-mandatory-decompression-stop diving,
and it is likely that it was both designed and rated accordingly. These units have no helium speech descramblers, so they are of limited utility for ambient pressure divers as you go deeper. The donald duck voice on top of the limited bandwidth of ultrasonic
comms at all makes intelligibility a challenge.</p>
<p dir="ltr">I had the unit to ~165 fsw, and I suspect that you could push it deeper, but you would void any warranty. I'm using PowerCom 3000D units now, and these have similar depth ratings.</p>
<p dir="ltr">Sean<br clear="none">
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On 2025-04-28 10:59, Jon Wallace via Personal_Submersibles <u></u>wrote:<br clear="none">
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<div dir="ltr">SB-2010 is rated to 130 feet by OTS. Has anyone tested one to deeper depths?</div>
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<div>On Monday, April 28, 2025 at 01:15:01 PM EDT, hank pronk via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:
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<div>Jon, put the whole unit outside the hull. I have zero issues with this. I just put fresh batteries in for each dive
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<div dir="ltr">Sent from my iPhone</div>
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<blockquote type="cite">On Apr 28, 2025, at 10:16 AM, Jon Wallace via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none">
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<div dir="ltr">Not a lot of room to work with of course inside the cabin. My controllers are mounted up near the top of the hull, the coax comes in from the bottom and is probably only about 18 inches laterally from the controllers. The coax cable thru-hull
is only 5/8 inch diameter (15.8 mm) so PL259's won't fit through it to allow me removal for maintenance which is why I opted for SMA. I suppose I could try it since I won't be removing the cable regularly but it's definitely going to be a PIA change.</div>
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<div dir="ltr">No I'm not sure whether the noise is electrical or acoustic in source but now that you've asked I can tell you that the controllers make an audible tone when the PWM is active, even with the OTS off. The tone changes of course depending upon
the PWM frequency I select, but it is always there. The same tone comes out the OTS, but amplified.</div>
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<div dir="ltr">Jon</div>
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<div>On Monday, April 28, 2025 at 11:51:58 AM EDT, Sean T. Stevenson via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:
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<p dir="ltr">Two things I would look at:</p>
<p dir="ltr">1) Relative location and shielding between the motor controller and the transducer cable. Is additional shielding (conduit?) possible?</p>
<p dir="ltr">2) I have encountered problems in the past with noise on coax due to impedance mismatch / partial signal reflection at any connectors. In my experience, this is solved by moving from RG58 up to RG8, but you don't have that option because the transducer
is a potted assembly. If you have enough cable tail available to experiment, I wonder about swapping the SMA connectors for PL259 to see if that makes a difference.</p>
<p dir="ltr">Are you certain that the noise you are hearing is being introduced electrically, and not acoustically in the ultrasonic range of the transducer?</p>
<p dir="ltr">Sean<br clear="none">
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<div dir="ltr">Hey folks,</div>
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<div dir="ltr">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.</div>
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<div dir="ltr">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).</div>
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<div dir="ltr">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.</div>
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<div dir="ltr">Anyone else have similar experiences with OTS?</div>
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<div dir="ltr">Jon</div>
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