Smithers(-Juergensen) electronics for Meg units

RMalahowski

I've got two of the Smithers units and I've tried to take a few guesses at the code to enable the Trimix. The serial number shows up when you are trying to enable and I'm sure there was some algorithm that Wil used so that you could quote the serial number and he would know what the enabling code is.

I would never what to give up these units. They are definitely all CMOS -very power conservative. Sometime back I switched my power source from the Lithium SAFT batteries in favor of four AAA batteries and the switchover worked great. Basically never have to worry about running out of batteries wherever I happen to be.

Would have been nice though to have access to the Trimix.

Bob

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Bob M.

Mike

I saw a lot of BAD FEED and FAB B00B1e5 in the networking world...

Not sure there are that many random passwords out there - they are normally something obvious, or something obvious combined with a hash... which is also something obvious.

Mike

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webhead

To test your theory, Mike, we would need a list of a few serial numbers and the trimix codes for them. Might be a pattern some math type person can discern.

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decoweenie

This applies only to those few Meg owners with the original Smither-Juergensen electronic, I found something new and interesting for me so thought I might share - although some of you might already knew this.

As discussed above about finding a way to enable the trimix portion of the electronic, I have been diving the Meg (with JS electronic) in our local training wreck that I very familiar with. And have tested almost every new dive gear there since I could control the profile and know the deco in my head.

I could say that these End RT's for:

1. GF 10/100 table (6m/20ft last stop)
2. JS electronic set diluent to 10% O2 (90% N2 since it is Nitrox mode) (3//10ft last stop)

match almost to the minute on this dive:

• 72m/240ft
• 20min BT
• 10/50 diluent
• 1.2 SP
• normal descent/ascent rate (20/10m)

It has been repeatable, but you have to follow the GF profile since the algorithm in JS-Meg electronic is just pure ZHL. Around the 15m/50m upward, the stops almost matched - vary by a 1-2 minutes.

What this means is if you know enough about deco, it might be possible to wing it by following a GF-style profile until 6m, and stay until the JS-Meg profile clears its 3m/10ft stop.

If you have no idea what I am talking about, please disregard this...

The next tests will be on the next deeper wreck we have (92m), I will update later...

Oh! And yes, I am still interested in a spare lid with JS electronic since mine will be upgraded to Shearwater in a few weeks. Contact me if you want to sell it...



.

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decoweenie

Here is the result for the same set-up on the deeper wreck... except:

• 85m/280ft
• 17mins BT (since OC buddy called dive early, planned for 20mins)
• everything else same as previous post

The end-of-result end RT is exactly the same to the minute (i.e. 86 mins total RT).

I am quite surprised that it would match so closely...

And if I am not sending the lid to Bruce tomorrow for the Shearwater upgrade, I would be happy using the JS as a guideline for deco under the conditions stated (i.e. 75% max depth for first stop, 1-min deep and intermediate stops, etc..).

The best parts about the JS electronic are a battery set lasts forever (up to 1-year as according to previous owner) and the time-out feature so you don't have to open up the lid to turn the electronic on.

Anyway, that was my last dive on the JS electronic lid and hope that the information above might be useful to someone has the same lid. I would have kept the lid for spare if I could buy a spare lid from ISC for the Shearwater...

Same disclaimer... If you have no idea what I am writing, please disregard the information!

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decoweenie

Still interest in one if anyone is looking to upgrade...

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Muzz

Phi
I'm confused, I have the apecks 2. What do I have to do and what will it cost to end up with a smithers head?
Either with a trade in or without. I need simple english.
Steve

decoweenie

Hi Steve,

Read the history of different Meg electronic versions HERE.

In short, to answer your email and question above:

• If you have APECS-2.01 then you have the latest and current version.
• Smithers version is the original version when the Meg first introduced. Steve Stolen told me about 50 units were produced, someone told me more like 13 units.
• Smithers version comes in Nitrox mode, and the owner would have to upgrade to Trimix by entering an unlock code. Most people didn't get a chance to do it before Will died.
• There is no support for the Smithers version.
• I found some correlations to the total deco RT when entering low fiO2 into my Nitrox version (as described above).
• I tend to think that most Smithers version owners already have upgraded to the latest APECS version, and don't know how many are left from the original batch.
• I am looking to buy an entire Smithers lid if someone was to upgrade by buying a complete APECS-2.01 lid from ISC.

Let me know if that answered your question.


.

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"...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..."

- Rebreather World PM

Tom Mount

I stil use and love my Smithers- however it does ocassionaly do 400 foot dives when my actual dive is 200 ft so if you go with Smithers it is wise to accept it will do weird things off and on

mine does have He in it, and I was lucky having had first production Meg upgraded to Smithers electroncs from magent driven orginal- to the last version of Smithers and with He just before Will died

Some of my friends have Smithers and love them but put up with off and on Cal issues etc

It is still the most energy efficient electronics out there -

Tom Mount

I also have Juergenson HH for one of my Megs- and Shearwater for another one-yes 3 Megs and two with Cis canisters

My HH one quit on me just as I was starting ascent from a 200 foot (60 m) dive in Oct and Kevin has me holding off for repair awaiting some great Mods he is making - Hope to get it in soon included delran handsets- solving of the battery problem and no more sticking on one minute at 10 fsw (3 msw)

The Shear water one is the version that Bruce came out with after he quit making them for Leon, I had had the ISC version and then upgraded to this one- I still have the one with the battery issue but easy to change so works great- I like the HUD with only a Cal block rather than a second hand set -

I will up grade my Smithers when and If Leon comes out with the long awaited Apecs III - I just like having real time deco

I think it will be worth the wait
Tom