wrote:

All but the really cheap inverters are in metal boxes, so I don't think
sheilding and such is an issue as much as the high slew rate on the
mains.

[...]

wrote:
1% distortion quoted above by Eric is a very nice number. Both types
of inverters square and sine can cause problems with noise. Do not
confuse high frequency switching noise with lower frequency harmonic
distortion that you would get with square waves. They are not the
same. Noise can come from many different sources within the inverter.

Noise *can be* an issue. One of my inverters -- the 500 watt one --
put out a fair amount of RF noise when running a 700 watt load. But
simple snap-on ferrites help if you have that problem.

The house inverter is much larger and rarely is pushed to rated load.

As for why... The Exeltech inverters use a high-frequency oscillator
and PWM to synthesize the waveform, as far as I can tell.

--
Eric F. Richards

"Nature abhors a vacuum tube." -- Myron Glass,
often attributed to J. R. Pierce, Bell Labs, c. 1940

If you are going to run a radio on 12 whatever bolts, (volts) forget the
inverters and use a Battery.Seeee,how simple life can be!
cuhulin,the simple arse

wrote:

[...]

Like I said about a thousand posts ago, run your gear on 12V. Wellbrook
doesn't sell a cigarette lighter adapter, but you can make one that is
postive ground. Just don't ever screw up and use it for something else.

[...]

I have 12 and 24 volt gear that runs directly off batteries, but there
are times when equipment needs to be isolated or cannot be powered off
12 volt (such as my RX-340). For good or ill, the easiest way to
handle both issues is to go through an inverter, and, unfortunately,
often a wall-wart. Commercially built DC-DC converters give no
guarantee of isolation.

--
Eric F. Richards

"Nature abhors a vacuum tube." -- Myron Glass,
often attributed to J. R. Pierce, Bell Labs, c. 1940

Some of them cheap wall warts will Zapp out and Zapp (ruin) your gear
too.I have had it happen to me before.
cuhulin

THe RX340 has a funny DC requirement, or is their no DC input at all?
Eric F. Richards wrote:
wrote:

[...]

Like I said about a thousand posts ago, run your gear on 12V. Wellbrook
doesn't sell a cigarette lighter adapter, but you can make one that is
postive ground. Just don't ever screw up and use it for something else.

[...]

I have 12 and 24 volt gear that runs directly off batteries, but there
are times when equipment needs to be isolated or cannot be powered off
12 volt (such as my RX-340). For good or ill, the easiest way to
handle both issues is to go through an inverter, and, unfortunately,
often a wall-wart. Commercially built DC-DC converters give no
guarantee of isolation.

--
Eric F. Richards

"Nature abhors a vacuum tube." -- Myron Glass,
often attributed to J. R. Pierce, Bell Labs, c. 1940

wrote:

THe RX340 has a funny DC requirement, or is their no DC input at all?

No DC input at all. Internally, the switching supply provides +5,
+12, -5 and -12 with respect to internal ground.

--
Eric F. Richards

"Nature abhors a vacuum tube." -- Myron Glass,
often attributed to J. R. Pierce, Bell Labs, c. 1940