[PSUBS-MAILIST] Adding an OTS surface unit inside sub

[Sean T. Stevenson via Personal_Submersibles]

The additional channels would require some additional tuning circuitry / DSP on the board.

Power will be a function of the amplifier circuitry. Easily doubled with a bigger amplifier, but at the expense of power consumption. Is the M version still rated as having the same battery life?

The transducer is a ceramic ring with a resonant frequency close to the transmission carrier frequency, but it will be a tradeoff in efficiency as you move away from the optimal frequency. A transducer that has to cover down to 25 kHz I would expect to be somewhat larger than one that only needs to extend down to 31.25 kHz. I may be mistaken, but I think the four channel units are optimized for channels 1/2 and are less efficient at 31.25 kHz. The eight channel units I might expect to be optimized for somewhere in the middle (29?).

Sean

-------- Original Message --------
On Nov. 10, 2020, 17:49, David Colombo via Personal_Submersibles wrote:

> Sean,
> On the STX101 M version which is the same unit as the STX101, it has 10 watt capability and channels 5-8 extra. Otherwise it looks the same as the STX101 unit. Any thoughts as to how they doubled the output power with the same battery source. It looks like the transducer is shaped slightly different as well.
>
> Best Regards,
> David Colombo
>
> 804 College Ave
> Santa Rosa, CA. 95404
> (707) 536-1424
> www.SeaQuestor.com
>
> On Tue, Nov 10, 2020 at 12:12 PM Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>> Channels lists for several OTS units below. Channel 1 is the standard sport channel, and Channel 7 is the standard military channel.
>>
>> Sean
>>
>> Buddy Phone D2:
>> Ch.1 32.768 kHz USB
>> Ch.4 31.250 kHz LSB
>>
>> RX-100-D2:
>> Ch.1 32.768 kHz USB
>> Ch.4 31.250 kHz LSB
>>
>> SP-100D-2
>> Ch.1 32.768 kHz USB
>> Ch.4 31.250 kHz LSB
>>
>> SSB-2010:
>> Ch 1: 32.768 kHz USB
>> Ch 2: 32.768 kHz LSB
>> Ch 3: 31.250 kHz USB
>> Ch 4: 31.250 kHz LSB
>>
>> SSB-1001B:
>> Ch 1: 32.768 kHz USB
>> Ch 2: 32.768 kHz LSB
>> Ch 3: 31.250 kHz USB
>> Ch 4: 31.250 kHz LSB
>> Ch 5: 28.500 kHz USB
>> Ch 6: 28.500 kHz LSB
>> Ch 7: 25.000 kHz USB
>> Ch 8: 25.000 kHz LSB
>>
>> STX-101:
>> Ch 1: 32.768 kHz USB
>> Ch 2: 32.768 kHz LSB
>> Ch 3: 31.250 kHz USB
>> Ch 4: 31.250 kHz LSB
>>
>> Bell-200:
>> Ch 7: 25.000 kHz USB
>>
>> STX-101SB:
>> 8.0875 kHz USB
>> Ch 7: 25.000 kHz USB
>>
>> STX-101SBR:
>> 8.0875 kHz USB
>> 11.000 kHz LSB
>> or
>> Ch 1: 32.768 kHz USB
>> Ch 7: 25.000 kHz USB
>>
>> MAG 1003D:
>> Ch 6: 28.500 kHz LSB
>> Ch 1: 32.768 kHz USB
>>
>> STX-101M:
>> Ch 1: 32.768 kHz USB
>> Ch 2: 32.768 kHz LSB
>> Ch 3: 31.250 kHz USB
>> Ch 4: 31.250 kHz LSB
>> Ch 5: 28.500 kHz USB
>> Ch 6: 28.500 kHz LSB
>> Ch 7: 25.000 kHz USB
>> Ch 8: 25.000 kHz LSB
>>
>> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
>> On Tuesday, November 10, 2020 12:29 PM, Brian Hughes via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>> For the Psubs crowd the standard is 32.768 kHz, that's channel 1 or the "sport channel" on OTS systems. Ocean Reef uses the same frequency as did Soniwave before they went out of business. Nearly all of the Aquacom systems will have that one, except for the military versions. All of my gear is discontinued, but it works well and was way cheaper than new.
>>>
>>> Helle and Scubaphone (Orcatron) use 27 kHz, at least that's the standard for them as I understand it. I have two Scubaphone surface units gathering dust as I was going to install them, but learned PSubs uses OTS channel 1. That way all our subs can talk to each other. Cliff has the pinout designation on the PSubs site.
>>>
>>> Brian
>>>
>>> Get[Outlook for Android](https://aka.ms/ghei36)
>>
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