The AM Forum

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

Wow that's cool but you will need to feed it 300 amps to get full power.

What? Insert a picture? Something else?

(http://ecx.images-amazon.com/images/I/61ek2EhCkqL._SL500_AA300_.jpg)

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.

6 Leece-Nevilles all in a row in front of your 350 chevy....

Yea, but Al is an EMI guy.

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).

The newer inverters run at a high sample frequency so the magnetics get smaller.
A minimum resistive load makes any switcher happy.

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.

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

ldb
K5WLF

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.