[Elecraft] OT: LED Light Bulbs

[Bob McGraw K4TAX]

Yes, exactly my point.

Although one may find the local AM or FM station is "exciting" these 
lamps, be they CFL or LED.  They may, to some extent, generate the crap 
we hear.   For us hams, when we transmit the noise may be produced but 
is not of concern in as much as they are quiet when we receive.  But as 
Jim, K9YC says, this may happen when a nearby transmitter is active, the 
nearby receiver is plagued with noise.

Clearly the CFL devices I used for testing did produce many more and 
higher level harmonics than the LED devices.   I did not have a large 
sample of lamps, but the ones used, did show issues with the LED units 
showing less than CFL's.

73

Bob, K4TAX


On 10/24/2017 11:05 AM, Jim Brown wrote:
> On 10/24/2017 5:55 AM, Bob McGraw K4TAX wrote:
>> When the transmitter was activated, the spikes of noise appeared.  
>> With the transmitter off, the spikes again were not present.    Not a 
>> real analytical or scientific method but some degree of indication 
>> that some are better than others, some are worse than others. 
>
> Sounds like classic received and re-radiated intermod, Bob. W3LPL has 
> chased this down, and I've observed it in our CW contesting trailer. 
> Set up in the middle of nowhere, no issues with transmitter harmonics 
> or intermod. Set up anywhere around civilization, strong harmonics and 
> intermod.
>
> 73, Jim K9YC
>
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