[PSUBS-MAILIST] OTS Magncom sw-1000

[David Colombo via Personal_Submersibles]

Hi Sean, I read the same thing about the headset. I will test that. I hope
the headsets that I already have will work. The plan is that I already have
the OTS SSB2010 unit installed and is operational along with the topside
unit, which has only channels 1-4 active. The Magnacom is a backup unit
that would be used if topside is having issues with the comms, due to
distance, otherwise channel 1 is the priority. Also as a backup the topside
diver unit could be taken via a diver to the sub location in an EVENT and
have the direct link with the sub via an external port. If I had a way to
add the 25hz to my topside unit I would. I just like the ability of greater
70w power and range as backup. The LI battery pack is of real interest to
me, as I believe it has an integrated bms for the 10 cells, and if it's
what I think it is it could be adapted to the SSB2010 unit for greater talk
time. From experience, my VHF handhelds are advertised with a greater range
of power @ 5w when the batteries are the rechargeable type vs 1w for
regular batteries. Not sure if it's the battery density or the power curve
before the power drops off that is giving more watts. I will know shortly
if the transducer can be removed and an extension cable added, which will
make the use as a topside unit more functionable.
Unfortunately this is the first time I have seen these units available, and
since I can't purchase replacement parts due to the military issue, this
might be a one off project. But will be fun to play with.

Best Regards,
David Colombo

804 College Ave
Santa Rosa, CA. 95404
(707) 536-1424
www.SeaQuestor.com



On Tue, Dec 15, 2020 at 7:34 AM Sean T. Stevenson via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

> Sorry - just wanted to clarify... If you were using this unit for acoustic
> comms with your own surface support, so not broadcasting on OTS channel 1
> as per the PSubs standard, but still better than most for that 1:1
> communication because of the strength of those units (they are supposedly
> exclusively US Navy), a rescue scenario within divable depth (like a PSubs
> event with a depth limit) might entail sending a diver down on hardwire
> channel 1, with a second com rope on hardwire channel 2 to connect to the
> port just to establish direct communications with the surface while the
> rest of the rescue plan is played out.
>
> The SSB-2010 units don't have that capability, though I suppose you only
> need a bulkhead port on the sub directly connected to an internal headset
> to duplicate it.
>
> Sean
>
> -------- Original Message --------
> On Dec. 15, 2020, 08:21, Sean T. Stevenson <
> sean.t.stevenson at protonmail.com> wrote:
>
>
> David - Where did you find these?
>
> 70W is nice. It's a shame that you can't get OTS channel 1 on them. I like
> the hardwire diver to diver for secure comms. The new magnacom units coming
> out next year have a secure channel which is electronically scrambled and
> then transmitted acoustically, but you can never get more secure than
> hardwire.
>
> That said, it sounds like the external port idea might work using the
> diver to diver connector, as the manual (attached) talks about duplex
> hardwire multiple diver connection using this port, which should work with
> anything. As a diver, I see a definite advantage in the ability to
> establish a direct hardwire link between a disabled sub and the surface
> (where depths permit), versus trying to do everything acoustically where
> you are affecting intelligibility on top of already compromised
> intelligibility due to helium voice on the diver side.
>
> I was surprised to read, however, that the earphone / microphone assembly
> worn by a diver using this unit may need to be specific to it. Unless I
> misunderstand (STEP 3, Section 3.3), it sounds like the regular earphone /
> microphone assemblies that are compatible with all the other comm systems
> won't work with this unit?
>
> Sean
>
> -------- Original Message --------
> On Dec. 15, 2020, 01:08, David Colombo via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Ok guys my pair of units arrived today. This military grade unit is
> supposed to be able to transmit 70w 3000ft on channel A 25hz. The
> transducer on this these are twice the size of the sb units. Also the
> battery pack is a li battery pack of 10 batteries, 12v at 2.2Ah. I
> contacted the mfg, only to discover that they were custom built for OTS and
> can be purchased only from them if you are military.  Tomorrow I plan on
> tearing down the battery as it appears to have a BMS under the shrink wrap.
> The other interesting thing is you can connect two diver units together and
> they can talk to each other which opens some doors for an external comms
> port in the event of an emergency communication with sub and diver unit.
> Looks like I might be going to the lake to see if these things are true
> since I just bought them as parts.
> David
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