[PSUBS-MAILIST] OTS Magncom sw-1000

[Sean T. Stevenson via Personal_Submersibles]

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 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 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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