Re: XG3 device...
Posted by
alorona on
Apr 15, 2011; 9:09pm
URL: http://elecraft.85.s1.nabble.com/XG3-device-tp6271930p6277685.html
Geoff, you're right. But I gather you're talking about two closely-spaced
sources?
I think the original question was whether harmonics from a *single* source would
be a real problem. After all, this thread was originally about the XG3.
Generally, any harmonics aren't going to be a real big problem. They'll be
well-filtered by the time they get to the real nonlinearities in a receiver.
And even if they're not, consider a 7 MHz signal coming out of an XG3 along with
a 2nd harmonic at 14 MHz.
The third order mixing products will be at 0 and 21 MHz. This will only be
dangerous if the receiver is either a zero-IF design or has very poor front end
rejection.
The problem might get a little worse as you go down to 160 meters, but even then
the 3rd order product will be at 5.4 MHz, which any 160m receiver worth its salt
should be able to reject.
Al W6LX
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