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Author Topic: My mobile KW (PS updated)  (Read 7143 times)
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w1vtp
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« on: December 28, 2010, 09:42:22 PM »

Regarding my subject "My mobile KW"

http://amfone.net/Amforum/index.php?topic=25004.0

Just reading a Heathkit ad from April 1966 QST.  The HP24 weighs out at 22 lbs.  Just checked my homebrewed PS - it weighs 30 lbs.  How 'bout that for some beef?

In a previous post someone suggested a power inverter.  Anyone have any thoughts on this ?

http://www.amazon.com/Power-when-Recreational-Traveling-Emergency-Electronics/dp/B0039H5BZA/ref=sr_1_fkmr0_2?ie=UTF8&qid=1293591131&sr=1-2-fkmr0

Al

PS: wish I knew how to to that nice url insert thingie
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WA1GFZ
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« Reply #1 on: December 28, 2010, 10:13:25 PM »

Wow that's cool but you will need to feed it 300 amps to get full power.
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Pete, WA2CWA
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CQ CQ CONTEST


WWW
« Reply #2 on: December 28, 2010, 11:26:51 PM »


PS: wish I knew how to to that nice url insert thingie

What? Insert a picture? Something else?

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Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
SM6OID
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« Reply #3 on: December 29, 2010, 06:58:15 AM »

Hej!

My experience is that inverters like that generates a LOT OF RF JUNK.
Output voltage is usually a "modified square wave".
Some inverters that I've come across seems to have great difficulties to regulate the output voltage if the load is anything that is very different from resistive.
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KL7OF
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« Reply #4 on: December 29, 2010, 09:54:47 AM »

Wow that's cool but you will need to feed it 300 amps to get full power.
6 Leece-Nevilles all in a row in front of your 350 chevy....
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WA1GFZ
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« Reply #5 on: December 29, 2010, 10:35:54 AM »

Yea, but Al is an EMI guy.
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KF1Z
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Are FETs supposed to glow like that?


« Reply #6 on: December 29, 2010, 11:09:06 AM »

A 100 watt light bulb in the trunk will help smooth the inverter output.

When I was "off the grid" I used a cheap truckstop inverter to run a motor that was pulse-width speed controlled..
It ran really rough and jumpy untill I turned on the light, then it smoothed out really well.

Pure sine wave inverters are getting cheaper all the time, and generate no more noise than a good switching PS ( that is after all what an inverter IS).

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WA1GFZ
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« Reply #7 on: December 29, 2010, 12:18:34 PM »

The newer inverters run at a high sample frequency so the magnetics get smaller.
A minimum resistive load makes any switcher happy.
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w1vtp
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« Reply #8 on: December 29, 2010, 10:16:38 PM »

Wish I could get more info on that beast. l wouldn't even consider an inverter that put out a SQ wave.  The web site won't offer a manual.
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K5WLF
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« Reply #9 on: December 29, 2010, 11:03:41 PM »

Al,

At that price and that advertised output, I'll GUARANTEE that it's a modified square wave (or as the marketing geeks call it modified sine wave). There's just no way any manufacturer could build a true sine machine and sell it for that.

Xantrex and Samlex are two manufacturers of good quality, true sine wave inverters.

http://www.xantrex.com
http://www.samlexamerica.com

ldb
K5WLF
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K9PNP
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« Reply #10 on: December 31, 2010, 12:37:34 PM »

This inverter uses a "modified sine wave", which is shown to be a square wave in the reference.  At least it is not a "pulse width modulated" sine wave;  I have had all kinds of interference problems with those, especially if not grounded exactly like the manual says.  Here is the manual for the 3000T.

* STP-3000_User_Manual.pdf (805.73 KB - downloaded 414 times.)
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73,  Mitch

Since 1958. There still is nothing like tubes to keep your coffee warm in the shack.

Vulcan Theory of Troubleshooting:  Once you have eliminated the impossible, whatever remains, however improbable, must be the truth.
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