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.<br><br>Sean<br><br><br><br>-------- Original Message --------<br>On Apr 3, 2019, 10:46, Brian Cox via Personal_Submersibles < personal_submersibles@psubs.org> wrote:<blockquote class="protonmail_quote"><br><DIV style="font-family:Arial, sans-serif; font-size:10pt;"><FONT size="2" style="font-family: Arial, sans-serif;">Keith, </FONT><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif"> 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 . </FONT></FONT></DIV><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif"><BR></FONT></FONT></DIV><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif">Brian</FONT></FONT></DIV><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif">kk6irc <BR></FONT></FONT><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">--- personal_submersibles@psubs.org wrote:</SPAN><BR><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">From: k6fee via Personal_Submersibles <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">To: Personal Submersibles General Discussion <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">Subject: Re: [PSUBS-MAILIST] K350 motors and housings - available</SPAN><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">Date: Tue, 02 Apr 2019 19:06:59 -0700</SPAN><BR><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">Brian,</SPAN><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><BR></DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">What band/frequency do you hang out on?</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><BR></DIV><DIV style="font-family: Arial, sans-serif; font-size: 100%; color: rgb(0, 0, 0);"><DIV>-------- Original message --------</DIV><DIV>From: Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org> </DIV><DIV>Date: 4/2/19 3:34 PM (GMT-08:00) </DIV><DIV>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org> </DIV><DIV>Subject: Re: [PSUBS-MAILIST] K350 motors and housings - available </DIV><DIV><BR></DIV></DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><FONT size="2">Keith (k6fee) Do you have a Ham radio yet ?</FONT><DIV><FONT size="2"><BR></FONT></DIV><DIV><FONT size="2">Brian</FONT></DIV><DIV><FONT size="2"> </FONT></DIV><DIV><FONT size="2">kk6irc </FONT></DIV><DIV><FONT size="2"><BR></FONT></DIV><DIV><FONT size="2"><BR></FONT><BR><SPAN style="font-size: 10pt;">--- personal_submersibles@psubs.org wrote:</SPAN><BR><BR><SPAN style="font-size: 10pt;">From: k6fee via Personal_Submersibles <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-size: 10pt;">To: Personal Submersibles General Discussion <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-size: 10pt;">Subject: Re: [PSUBS-MAILIST] K350 motors and housings - available</SPAN><BR><SPAN style="font-size: 10pt;">Date: Tue, 02 Apr 2019 15:00:50 -0700</SPAN><BR><BR><SPAN style="font-size: 10pt;">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.</SPAN><DIV style="font-size: 10pt;"><BR></DIV><DIV style="font-size: 10pt;">Keith T.</DIV><DIV style="font-size: 10pt;"><BR></DIV><SPAN style="font-size: 10pt;">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.</SPAN><BR><BR><SPAN style="font-size: 10pt;">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.</SPAN><BR><BR><SPAN style="font-size: 10pt;">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.</SPAN><BR><BR><SPAN style="font-size: 10pt;">Sean</SPAN><BR><BR><BR><SPAN style="font-size: 10pt;">-------- Original Message --------</SPAN><BR><SPAN style="font-size: 10pt;">On Apr 2, 2019, 11:49, Cliff Redus via Personal_Submersibles < personal_submersibles@psubs.org> wrote:</SPAN><BLOCKQUOTE style="font-size: 10pt;"><BR><DIV style="font-size:100%;color:#000000"><DIV>-------- Original message --------</DIV><DIV>From: "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles@psubs.org> </DIV><DIV>Date: 4/2/19 11:33 AM (GMT-08:00) </DIV><DIV>To: personal_submersibles@psubs.org </DIV><DIV>Subject: Re: [PSUBS-MAILIST] K350 motors and housings - available </DIV><DIV><BR></DIV></DIV><DIV style=""><DIV style=""><DIV style=""><DIV style="font-family: times new roman, new york, times, serif; font-size: 16px;"></DIV>
<DIV style="font-family: times new roman, new york, times, serif; font-size: 16px;">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) <A href="https://3eonline.com/ImageServer/ImageViewer.aspx?id=3Q%2FfAR8ne%2FvPh6syVnSymkS%2BBDo8OjmbVocxRCMEgeG%2Fk%2B6G7BpCwxJIcm%2FtzFJTddB5zxzJXIW7nbmF5mKrdg%3D%3D" style="font-family:times new roman, new york, times, serif;font-size:16px;">ImageViewer</A> Seems like it is classified as a <SPAN style="font-family:times new roman, new york, times, serif;font-size:16px;">Simple Asphyxian which according to Wikipidia "<SPAN><SPAN style="color:rgb(34, 34, 34);font-family:sans-serif;font-size:10.5px;">An </SPAN><B style="color:rgb(34, 34, 34);font-family:sans-serif;font-size:10.5px;">asphyxiant gas</B><SPAN style="color:rgb(34, 34, 34);font-family:sans-serif;font-size:10.5px;"> is a nontoxic or minimally toxic </SPAN><A href="https://en.wikipedia.org/wiki/Gas" title="Gas" style="color:rgb(11, 0, 128);background-image:none;font-family:sans-serif;font-size:10.5px;">gas</A><SPAN style="color:rgb(34, 34, 34);font-family:sans-serif;font-size:10.5px;"> which reduces or displaces the normal </SPAN><A href="https://en.wikipedia.org/wiki/Oxygen" title="Oxygen" style="color:rgb(11, 0, 128);background-image:none;font-family:sans-serif;font-size:10.5px;">oxygen</A><SPAN style="color:rgb(34, 34, 34);font-family:sans-serif;font-size:10.5px;"> concentration in breathing </SPAN><A href="https://en.wikipedia.org/wiki/Gas_composition" title="Gas composition" style="color:rgb(11, 0, 128);background-image:none;font-family:sans-serif;font-size:10.5px;">air</A><SPAN style="color:rgb(34, 34, 34);font-family:sans-serif;font-size:10.5px;">. "</SPAN></SPAN></SPAN></DIV><DIV style="font-family: times new roman, new york, times, serif; font-size: 16px;"><BR></DIV><DIV style="font-family: Helvetica Neue, Segoe UI, Helvetica, Arial, sans-serif; font-size: 16px; max-width: 400px;"><A href="https://3eonline.com/ImageServer/ImageViewer.aspx?id=3Q%2FfAR8ne%2FvPh6syVnSymkS%2BBDo8OjmbVocxRCMEgeG%2Fk%2B6G7BpCwxJIcm%2FtzFJTddB5zxzJXIW7nbmF5mKrdg%3D%3D" style="text-decoration:none !important;color:#000 !important;"><TABLE border="0" cellpadding="0" cellspacing="0" style="max-width:400px;"><TBODY><TR><TD colspan="1" rowspan="1" width="400"><TABLE border="0" cellpadding="0" cellspacing="0" width="100%" style="max-width:400px;border-width:1px;border-style:solid;border-color:rgb(224, 228, 233);border-radius:2px;"><TBODY><TR><TD colspan="1" rowspan="1"><TABLE border="0" cellpadding="0" cellspacing="0" style="background:#fff;position:relative;z-index:2;width:100%;max-width:400px;border-radius:0 0 2px 2px;border-top:1px solid rgb(224, 228, 233);"><TBODY><TR><TD colspan="1" rowspan="1" style="background-color:#ffffff;padding:16px 0 16px 12px;vertical-align:top;border-radius:0 0 0 2px;"></TD><TD colspan="1" rowspan="1" style="vertical-align:middle;padding:12px 24px 16px 12px;width:99%;font-family:Helvetica Neue, Segoe UI, Helvetica, Arial, sans-serif;border-radius:0 0 2px 0;"><H2 style="font-size:14px;line-height:19px;margin:0px 0px 6px;font-family:Helvetica Neue, Segoe UI, Helvetica, Arial, sans-serif;color:rgb(38, 40, 42);">ImageViewer</H2><P style="font-size:12px;line-height:16px;margin:0px;color:rgb(151, 155, 167);"></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></A></DIV><DIV style="font-family: times new roman, new york, times, serif; font-size: 16px;"><BR></DIV><DIV style="font-family: times new roman, new york, times, serif; font-size: 16px;"><BR></DIV><DIV style="font-family: times new roman, new york, times, serif; font-size: 16px;"><SPAN><SPAN><SPAN><SPAN style="color:rgb(34, 34, 34);font-family:sans-serif;font-size:10.5px;"><BR></SPAN></SPAN></SPAN></SPAN></DIV><DIV style="font-family: times new roman, new york, times, serif; font-size: 16px;"><SPAN><SPAN><SPAN><SPAN style="color:rgb(34, 34, 34);font-family:sans-serif;font-size:10.5px;"><SPAN><SPAN style="color:rgb(0, 0, 0);font-family:times new roman, new york, times, serif;font-size:16px;">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 <SPAN>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.</SPAN></SPAN></SPAN><BR></SPAN></SPAN></SPAN></SPAN></DIV><DIV style="font-family: times new roman, new york, times, serif; font-size: 16px;"><BR></DIV><DIV style="">Sean, you are a technical diver, do you think there would be an issue with hypoxia if <SPAN style="font-family: times new roman, new york, times, serif; font-size: 16px; color: rgb(0, 0, 0);">all the </SPAN>HFC-134a in a small AC unit were dumped into a one atm cabin say 72 cuft?</DIV><DIV style="font-family: times new roman, new york, times, serif; font-size: 16px;"><SPAN><SPAN><SPAN><SPAN style="color:rgb(34, 34, 34);font-family:sans-serif;font-size:10.5px;"><SPAN><SPAN style="color:rgb(0, 0, 0);font-family:times new roman, new york, times, serif;font-size:16px;"><SPAN><BR></SPAN></SPAN></SPAN></SPAN></SPAN></SPAN></SPAN></DIV><DIV style="font-family: times new roman, new york, times, serif; font-size: 16px;"><SPAN><SPAN><SPAN><SPAN style="color:rgb(34, 34, 34);font-family:sans-serif;font-size:10.5px;"><SPAN><SPAN style="color:rgb(0, 0, 0);font-family:times new roman, new york, times, serif;font-size:16px;"><SPAN>Cliff</SPAN></SPAN></SPAN></SPAN></SPAN></SPAN></SPAN></DIV><DIV style="font-family: times new roman, new york, times, serif; font-size: 16px;"><SPAN><SPAN><SPAN><SPAN style="color:rgb(34, 34, 34);font-family:sans-serif;font-size:10.5px;"><BR></SPAN></SPAN></SPAN></SPAN></DIV><DIV style="font-family: times new roman, new york, times, serif; font-size: 16px;"><BR></DIV>
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On Tuesday, April 2, 2019, 11:46:05 AM CDT, k6fee via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<DIV><DIV><DIV>The DC compressor & water cooled condenser are the most expensive items.<DIV><BR></DIV><DIV>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.</DIV><DIV><BR></DIV><DIV>Keith T.</DIV><DIV><BR></DIV><DIV style="font-size:100%;color:#000000;"><DIV><DIV>-------- Original message --------</DIV><DIV>From: Cliff Redus via Personal_Submersibles <personal_submersibles@psubs.org> </DIV><DIV>Date: 4/2/19 8:40 AM (GMT-08:00) </DIV><DIV>To: k6fee via Personal_Submersibles <personal_submersibles@psubs.org> </DIV><DIV>Subject: Re: [PSUBS-MAILIST] K350 motors and housings - available </DIV><DIV><BR></DIV></DIV></DIV><DIV><DIV style="font-family:times new roman, new york, times, serif;font-size:16px;"><DIV></DIV>
<DIV>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 ....</DIV><DIV><BR></DIV><DIV>Cliff</DIV><DIV><BR></DIV>
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On Tuesday, April 2, 2019, 9:46:03 AM CDT, k6fee via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<DIV><DIV><DIV><DIV>Allen,</DIV><DIV><BR></DIV><DIV>Check these out.</DIV><DIV><BR></DIV>http://www.cruisencomfortusa.com/marineseries/?gclid=EAIaIQobChMIirDF5s6x4QIVcyCtBh3K8w2JEAMYASADEgIDqvD_BwE<DIV><BR></DIV><DIV>http://www.comar-marine.com/product.php?id_product=20</DIV><DIV><BR></DIV><DIV>Keith T.</DIV><DIV><BR></DIV><DIV style="font-size:100%;color:#000000;"><DIV><DIV>-------- Original message --------</DIV><DIV>From: Cliff Redus via Personal_Submersibles <personal_submersibles@psubs.org> </DIV><DIV>Date: 4/2/19 7:06 AM (GMT-08:00) </DIV><DIV>To: Brian Hughes via Personal_Submersibles <personal_submersibles@psubs.org> </DIV><DIV>Subject: Re: [PSUBS-MAILIST] K350 motors and housings - available </DIV><DIV><BR></DIV></DIV></DIV><DIV><DIV style="font-family:times new roman, new york, times, serif;font-size:16px;"><DIV></DIV>
<DIV>To me AC on personal subs is an interesting topic. As the Psub community frequently dives off Islamorada Florida, it is a relative thread.</DIV><DIV>Below is a graph taken from flight recorder on the R300 during a Psub dive off the coast of <SPAN><SPAN style="color:rgb(0, 0, 0);font-family:times new roman, new york, times, serif;font-size:16px;">Islamorada in August of 2017.</SPAN></SPAN></DIV><DIV><BR></DIV><DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></BLOCKQUOTE><SPAN style="font-size: 10pt;">_______________________________________________
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