[AMPS] Re: [HeathKit] Starter amp choices ?

[Jon Ogden]

>A good clean amp will not generate parasitics nor hopefully harmonics, but
>an operator using more power than necessary can and probably will generate
>needless QRM, which of course is interference.
>

Please explain how running more power generates QRM given that the signal 
is clean?  Yes, higher power takes "slightly" more bandwidth, but not 
enough of any significance.

OK, with higher power, your IM products increase somewhat (2 dB for every 
1 dB increase in power), so yes, IM products can cause QRM, but again "if 
the amp is clean."  If it is properly designed and run, then all the IM 
should be within specs and regulations.

Now, if the amp has spurs, is over driven or generally not clean, then 
all bets are off and yes, the QRM intensifies.

>FCC regulations stipulate the use of only the amount of power necessary for
>adequate communications.

IMHO, a different issue than wether or not you are causing QRM.

73,

Jon
KE9NA



--------------------------------------------------------------------------
Jon Ogden

jono@enteract.com
www.qsl.net/ke9na

"A life lived in fear is a life half lived."


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