[PSUBS-MAILIST] K350 motors and housings - available

Wed Apr 3 13:03:18 EDT 2019

The Icom AH-2B antenna works with the AH-4 and is only 8.2 feet long. Supposedly that will work on 40 meters. I have an IC7100 in my truck that I use with an SG-7900 for 2m / 70cm. No HF as of yet, but it is possible on mobile installations, though performance is obviously reduced on a short antenna.

Sean

-------- Original Message --------
On Apr 3, 2019, 10:46, Brian Cox via Personal_Submersibles wrote:

> Keith,
>                  40 meters seems to be the best , usually around 7.235 MHz. in the evening.    I have a plan to put my rig on the sub, but have to get a different antenna.  The antenna I have now is the back stay of the sailboat ( about 30' long)  and I'm using the icom AH4 antenna tuner which requires the antenna to be at least 24' long and I can't get that on the sub .
>
> Brian
> kk6irc
> --- personal_submersibles at psubs.org wrote:
>
> From: k6fee via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] K350 motors and housings - available
> Date: Tue, 02 Apr 2019 19:06:59 -0700
>
> Brian,
>
> What band/frequency do you hang out on?
>
> -------- Original message --------
> From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
> Date: 4/2/19 3:34 PM (GMT-08:00)
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] K350 motors and housings - available
>
> Keith  (k6fee)   Do you have a Ham radio yet ?
>
> Brian
>
> kk6irc
>
> --- personal_submersibles at psubs.org wrote:
>
> From: k6fee via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] K350 motors and housings - available
> Date: Tue, 02 Apr 2019 15:00:50 -0700
>
> INMHO the only safe way to use a HFC cooler is to have the unit in a sealed box under vacuum, chilling water that is pumped to fan coils. If there is a leak, an alarm ( pressure & HFC detector activated) informs the operator so they can surface, while the sealed unit contains the refrigerant protecting the occupants.
>
> Keith T.
> The problem with refrigerants in confined spaces, and this is true both of HFC-134a and the environmentally friendly(er) alternatives, such as HFO-1234yf, is that they release extremely toxic decomposition products in the event of fire. Of course, any fire is going to compromise your atmosphere, so this may be a moot point, but it's something to consider. HFC-134a has low acute toxicity, but is not strictly a simple inert asphyxiant. A 1 hour EEGL exposure limit recommendation that I managed to find for HFC-134a is 4,000 ppm.
>
> In a 72 cu. ft. volume, assuming a starting FO2 of 20.9%, you could add a full 7 cu. ft. of simple asphyxiant gas before the cabin FO2 dropped to 19%. Death likely wouldn't occur due to hypoxia above 16% FO2, but you won't be accomplishing much with oxygen that low. 19.0% to 19.5% are typical occupational limits for oxygen deficient atmospheres.
>
> That said, hypoxia is not the only risk as I pointed out. I would consider the health effects from inhalation exposure and keep to recommended exposure limits. For maximum safety, I might be inclined to separate refrigerants from occupied spaces by means of a water / propylene glycol heat exchanger circuit, but of course this will affect your energy budgets.
>
> Sean
>
> -------- Original Message --------
> On Apr 2, 2019, 11:49, Cliff Redus via Personal_Submersibles < personal_submersibles at psubs.org> wrote:
>
>> -------- Original message --------
>> From: "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles at psubs.org>
>> Date: 4/2/19 11:33 AM (GMT-08:00)
>> To: personal_submersibles at psubs.org
>> Subject: Re: [PSUBS-MAILIST] K350 motors and housings - available
>>
>> Keith, I like the idea of a DIY AC system for my boat but hate the idea of dying because of a refrigerant leak.  I looked up the MSDS sheet for HFC-134a (common refrigant used in auto AC systems)     [ImageViewer](https://3eonline.com/ImageServer/ImageViewer.aspx?id=3Q%2FfAR8ne%2FvPh6syVnSymkS%2BBDo8OjmbVocxRCMEgeG%2Fk%2B6G7BpCwxJIcm%2FtzFJTddB5zxzJXIW7nbmF5mKrdg%3D%3D)  Seems like it is classified as a Simple Asphyxian which according to Wikipidia "An asphyxiant gas is a nontoxic or minimally toxic [gas](https://en.wikipedia.org/wiki/Gas) which reduces or displaces the normal [oxygen](https://en.wikipedia.org/wiki/Oxygen) concentration in breathing [air](https://en.wikipedia.org/wiki/Gas_composition). "
>>
>> https://3eonline.com/ImageServer/ImageViewer.aspx?id=3Q%2FfAR8ne%2FvPh6syVnSymkS%2BBDo8OjmbVocxRCMEgeG%2Fk%2B6G7BpCwxJIcm%2FtzFJTddB5zxzJXIW7nbmF5mKrdg%3D%3D
>>
>> ImageViewer
>>
>> What this mean to me is that we would to do a calc to see what the oxygen concentration in a 1-atm boat would go to if all the HFC-134a in the unit was released at one time to see if the concentration would result in hypoxia for the operator.  In my boat I measure O2 concentration as I have a PID controller tasked with keeping the O2 concentration at 21%  So I would get a low O2 alarm rather quickly.
>>
>> Sean, you are a technical diver, do you think there would be an issue with hypoxia if all the HFC-134a in a small AC unit were dumped into a one atm cabin say 72 cuft?
>>
>> Cliff
>>
>> On Tuesday, April 2, 2019, 11:46:05 AM CDT, k6fee via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>> The DC compressor & water cooled condenser are the most expensive items.
>>
>> If your a DIY'er, go to your nearest "Pick & Pull" get a car AC compressor add a DC drive motor, condenser & evap coil and roll your own.  It will take 2 HP to full drive the compressor, however you can vary the speed and control the cooling, while minimizing current drain. You'll need a refrigerant detector as a leak will kill you in the confines of a PSUB. Or go thermo electric.
>>
>> Keith T.
>>
>> -------- Original message --------
>> From: Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org>
>> Date: 4/2/19 8:40 AM (GMT-08:00)
>> To: k6fee via Personal_Submersibles <personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] K350 motors and housings - available
>>
>> Thanks for the links,  The MES24S - 24V unit looks like it would work great but at  $3,895 , I am not going to be ordering in the near future. In the spirit of Psub and DIY, I wonder how hard it would be to design and build on of these units.  Seems to be made up of readily available parts like a compressor, blower, coil ....
>>
>> Cliff
>>
>> On Tuesday, April 2, 2019, 9:46:03 AM CDT, k6fee via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>> Allen,
>>
>> Check these out.
>>
>> http://www.cruisencomfortusa.com/marineseries/?gclid=EAIaIQobChMIirDF5s6x4QIVcyCtBh3K8w2JEAMYASADEgIDqvD_BwE
>>
>> http://www.comar-marine.com/product.php?id_product=20
>>
>> Keith T.
>>
>> -------- Original message --------
>> From: Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org>
>> Date: 4/2/19 7:06 AM (GMT-08:00)
>> To: Brian Hughes via Personal_Submersibles <personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] K350 motors and housings - available
>>
>> To me AC on personal subs is an interesting topic.  As the Psub community frequently dives off Islamorada Florida, it is a relative thread.
>> Below is a graph taken from flight recorder on the R300 during a Psub dive off the coast of Islamorada in August of 2017.
>
> _______________________________________________ Personal_Submersibles mailing list Personal_Submersibles at psubs.org http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles_______________________________________________ Personal_Submersibles mailing list [Personal_Submersibles at psubs.org](/eonapps/ft/wm/page/compose?send_to=Personal_Submersibles%40psubs.org) http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20190403/1a79ae4f/attachment-0001.html>