[Milsurplus] Dirty generators

[Richard]

You raise an interesting point.  I've had three gas generators, and none 
radiated radio noise.  conversely, 60-70 years ago in a quiet location 
one could hear car ignition noise a mile or more away.  Back then 
ignition noise was a BIG problem for mobile operation.

Decades ago there was a report in QST about a guy who bought a generator 
for field-day use which promptly burned up his transformers. Examination 
of the waveform showed square waves with huge spikes at the crossover 
points.  My first generator had triangular waves which rounded slightly 
under load. (a saturated pole design, whatever that is)  Transformer 
exciting current was less than on a sine wave, and it worked fine.

Richard, AA1P

On 11/1/20 12:15 PM, CL in NC via Milsurplus wrote:
> Back in the day of the 110VAC/12VDC radio, both tube type and solid state, the DC side was either a vibrator or switching transistors, and their output fed a square wave to the same power transformer as the separate 110VAC primary.  Most of the dirty generators say some where that they are not for electronic equipment, but that would be the modern stuff that has their own switching supplies built in.  If the rig is one with a transformer in it for the PS, perhaps the issue is the receiver picking up through its antenna input, every squeak, tone, and spike the generator is creating.
>
> Charlie, W4MEC in NC
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