The best test is to bring a portable shortwave radio, and listen before 
you buy...  Most places, have a demo generator set up.Make it clear to 
the vendor that if the unit is generating RFI you will be returning it, 
with the expectation of a full refund.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 9/19/20 9:23 PM, Warren Wolff via RFI wrote:
 
   I am considering the purchase of an emergency back-upgenerator.  For the first time, I have encountered unitstagged as 
“inverters”.  Does this mean that some systemsare AC generators while the “Inverter-types” generateDC and then convert 
it to AC?    “Inverter” immediatelyprecipitates the worry of RFI.  Comments, please.
WarrenW7WY
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