We Need More Power!

So, we had a unique power source for field day.  A hydrogen fuel cell.

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There’s a bank of lead acid deep cycle batteries under the fuel cell.  The cell basically acts as a battery tender charging the batteries and supporting the load while it is on and then turning back off when the batteries are full.

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We ran a 48V DC bus (see the extension cord coming out on the left) ran that back into the communications trailer.  This decreased the I2R losses (see also here for info) from the longer cable run.  Within the trailer was a DC to DC converter that put out 13.8V for all of our communications equipment and we also had adapters to run our laptops and other equipment.

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It actually was quite effective and we started with an “empty” tank and still ran for over 8 hours on it.  The calculations are we could run for over 48 hours on a single tank of hydrogen.  The cell its self has a rating of 1KW and we actually did get it up that high, however I didn’t get a picture of it.  The fuel cell was running like mad because we left it off after out thunderstorm to let things dry out.

In the mean time we kicked back into operational mode meaning 2 radios fired back up plus their associated computers and associated equipment for digital operation.  All just running off the batteries without the Fuel Cell maintaining them when necessary.

Our clue to go turn the cell back on was when the low battery alarm went off in the trailer indicating the 48V supply was starting to drop.  We did also have a 12V batter on the other side of the 48V to 12V converter in the trailer.  This was to add extra isolation for surging loads (radios).

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The fuel cell worked great and was always fun when someone would brag about running off of solar.  Yeah, well we’ve harnessed the power of molecular bonds!

For those who don’t know how fuel cells work, the basic premise is that the electron from hydrogen is forced through the circuit as the proton mates with the oxygen to form water.

Now some would call this a wonderfully green technology, however that hydrogen has to come from somewhere, and most often than not it’s through electrolysis.

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*Also as an aside since the wife and I were just talking about it.  If you’re a ham, do not use the term kilo-watt for phonetics.  The word you’re looking for is kilo.  Kilo-watt is very confusing because it is a compound word.  Are you saying K or KW?  Other’s do use the term watt for W, which while incorrect can further add to confusion.  Seriously, the IACO/NATO/ITU phonetic alphabet was developed specifically to limit confusion.  If your word choices were so great, why haven’t they adopted them?

You may think it’s neat and cute, but at least in the case of the wife and I, we slow way down to deal with your choice of phonetics.  I am reasonably sure that I am not the only one who has been confused by this usage.  It’s hard enough to dig phone messages out of the weeds, why add a bit of extra confusion to the conversation.  But that’s just my two cents, take it for what its worth.

Barron is the owner, editor, and principal author at The Minuteman, a competitive shooter, and staff member for Boomershoot. Even in his free time he’s merging his love and knowledge of computers and technology with his love of firearms.

He has a BS in electrical engineering from Washington State University. Immediately after college he went into work on embedded software and hardware for use in critical infrastructure. This included cryptographic communications equipment as well as command and control devices that were using that communications equipment. Since then he’s worked on just about everything ranging from toys, phones, other critical infrastructure, and even desktop applications. Doing everything from hardware system design, to software architecture, to actually writing software that makes your athletic band do its thing.

We Interrupt Your Regularly Scheduled Program…

So we had a minor hiccup with field day.  Our station is currently off-line and we are sitting in the trailer chit chatting.

Now why would we all move inside?  Well this doesn’t fully show what’s wrong but probably gives you a solid idea of what’s wrong.

It was making loud noises and flashing through the sky.  It just recently stopped hailing.  We disconnected everything and lowered the stepper antenna for safety.  We’re just now slowly starting the system back up.

So this interruption was brought to you by mother nature and we are now returning back to our regularly scheduled program.

Barron is the owner, editor, and principal author at The Minuteman, a competitive shooter, and staff member for Boomershoot. Even in his free time he’s merging his love and knowledge of computers and technology with his love of firearms.

He has a BS in electrical engineering from Washington State University. Immediately after college he went into work on embedded software and hardware for use in critical infrastructure. This included cryptographic communications equipment as well as command and control devices that were using that communications equipment. Since then he’s worked on just about everything ranging from toys, phones, other critical infrastructure, and even desktop applications. Doing everything from hardware system design, to software architecture, to actually writing software that makes your athletic band do its thing.

CQ Field Day

I’m spending the day doing field day with the local ham radio club.  We actually have a hydrogen fuel cell that we’re running all our radios off of.  We spent a chunk of the morning hooking and setting up antennas including a nice Stepper IR that was donated for use during field day.

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It took us a lot longer than expected to set that bad boy up.  We were having SWR problems and we’ve been trying to debug the issue.  First up was checking all the connections and we discovered this in one of the connections.

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That however wasn’t the problem.  The SWR was still way above 3.  What else could be the problem.  Well we bypassed the 80m tuning coil and bang, SWR dropped to 1.  I think we found the problem.  At that point it was time to grab some lunch and now I’m working on logging while my compatriot runs the radio.

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I’ll be busy until late tonight.  If you’re a fellow ham and you hear KD7PH, feel free to send a shout out. We’re going to start running some of the digital modes here in a bit but were running phone now.

It is nice being able to run that Stepper IR thought anywhere between 40m and 10m.  We haven’t tried running 80m since we pulled the coil but so far if we can hear them we can work them.  All running just measly 100 watts.

We just bumped to 15 meters to see how things will run for now.  I have to say I would like to get one of those for my house, the thought of the cost though doesn’t have me running to buy one

It is nice being able to do all this in an air-conditioned trailer.  Even though storms rolled in, the heat’s still pretty high and the humidity has gone up.  It’s going to be a fun day.

Barron is the owner, editor, and principal author at The Minuteman, a competitive shooter, and staff member for Boomershoot. Even in his free time he’s merging his love and knowledge of computers and technology with his love of firearms.

He has a BS in electrical engineering from Washington State University. Immediately after college he went into work on embedded software and hardware for use in critical infrastructure. This included cryptographic communications equipment as well as command and control devices that were using that communications equipment. Since then he’s worked on just about everything ranging from toys, phones, other critical infrastructure, and even desktop applications. Doing everything from hardware system design, to software architecture, to actually writing software that makes your athletic band do its thing.