[aprssig] Fossil-fuel-free-Fieldday Fun

Dale Laluk dale.laluk at gmail.com
Thu Jun 11 13:50:43 CDT 2015


Hi,

All this discussion reminded me of a funny story from my past. Hopefully no
one is offended and if not interested please delete.

I was working as a broadcast engineer for a major TV broadcaster and we are
covering a typical football game. This includes cameras all over the place,
including one via really long cable in the parking lot ( yes now a days all
done via RF, but we are talking the 80's ). The camera men had been advised
to be careful of the cables as they are expensive and also have 300 VDC on
them. That 300 VDC goes into a convertor at the base of the camera, to
produce 12 volts to feed the camera.

Well one day, a very beautiful young lady had a dead battery and the camera
operator decided to help out. Our first indication of problems was as his
feed went dead ( disconnected the camera ). He then used two nails he
found, to attach a set of booster cables and then put the nails into the
two largest connector sockets. His logic was the camera runs on 12 volts,
so therefore it must come in via the cable. The biggest sockets probably
have the most power.

So back in the trailer, we finally get his feed back, after he plugs in the
camera and we reset the power system, to have him showing the car on fire.

It was a good day.

Dale VE7PGB



On Thu, Jun 11, 2015 at 9:49 AM, Stanley Stone via aprssig <aprssig at tapr.org
> wrote:

> I love the idea--Bob definitely thinks out of the box. I’m sure someone
> told the Wright brothers that flying was dangerous, that you could get
> killed doing that. Instead of “that’s too dangerous…”, how about “How can
> we make this work and not kill ourselves?”
>
> Stan, W4HIX
>
>
> On Jun 11, 2015 7:13 AM, "Robert Bruninga via aprssig" <aprssig at tapr.org>
> wrote:
>
>> Eventually we should get to a fossil-fuel-free fieldday.  It is easy to
>> avoid that stink-pot-foul smelling-polluting-noisey generator by just
>> running some small conductor wire to every car parked at Fieldday.
>> Parallel them all and without drawing more than 100W from each car, you can
>> provide over a kW throughout fieldday just from batteries.
>>
>>
>> Just plug in 100W cigarette lighter inverters into each car, add two caps
>> and two diodes to double the 60 Hz 120v up to 330 VDC and distribute that
>> to all the operating positions.  Then just plug in standard SWITCHING power
>> supplies wherever needed to the 330VDC and get all the 12v AMPS you need at
>> each site.
>>
>>
>> By upconverting to 330 VDC there are several advantages:
>>
>> 1)      Distribution wire size is only 1% of what it would need to be at
>> 12v and only 10% of what it would be at 120v
>>
>> 2)      You can deliver over 1 kW via simple #18 zip cord over hundreds
>> of feet and still only draw 3 amps, well below the rating of the wire.
>>
>> 3)      You can parallel as many cars as you like at 330 VDC for
>> distributed energy
>>
>> 4)      10 solar panels in series can provide 330 VDC at 7 amps (over 2
>> kW)
>>
>> 5)      Or you can put microinverters ($125) on each solar panel to
>> gernerate the 120vac (into 330VDC) for distributed power
>>
>>
>> The disadvantage is re-educating ham operators about high voltage DC
>> safety.
>>
>>
>> After field day and crises at work, I hope to come up with a general idea
>> and concept, and connectors, and safety features to make this a
>> come-as-you-are way to make emergency field power not just for fielday but
>> for everyday as-needed use.
>>
>>
>> Remember, every HYBRID comes to Field Day with a few kWh of energy
>> already at high voltage, and every electric car comes with 10 to 20 kWh of
>> energy.  But the easiest place to tap in, is still, the cigarette lighter
>> at 12v and then  upconvert to 330 VDC for distribution and then down
>> convert back to 12v for universal usage at the station…
>>
>>
>> I have done that over 3000’ using nothing but one #24 wire and Ground.
>> See  http://aprs.org/aprs-swer.html
>>
>> But for Fieldday distances, better to avoid the ground loop and simply
>> run two-conductor zip cord or other convenient wire.
>>
>>
>> If you don’t understand HV DC, then ignore this and stay away.  Remember
>> even 8 year old cub scouts when I was a kid built HV Tube radios as a
>> standard requirement with open wiring on mom’s spare breadboard… and none
>> died…
>>
>>
>> Bob, Wb4APR
>>
>>
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