Amps
[Top] [All Lists]

[AMPS] Bandpass Filtering

To: <amps@contesting.com>
Subject: [AMPS] Bandpass Filtering
From: jono@enteract.com (Jon Ogden)
Date: Wed, 28 Apr 1999 21:36:17 -0500
>> Bricks are notorious for their non-linearity and no 
>> matter how good yours may be, I doubt that it is as linear as your 
>> exciter. 
>
>Explain that please? The output devices usually come from the same
>company, Motorola, and except for the power gain are darn near identical.
>Dont blame the device if its due to poor execution.

Well, any amplifier except a PERFECTLY linear amplifier (which doesn't 
exist) will produce harmonics and intermod.  A class B device will 
produce more than a class AB device which will produce more than a class 
A device.  I think most "bricks" are either class AB or B.  They are 
therefore NON-LINEAR devices.  Any non-linear device will produce 
harmonics.  Now, do the amps have low pass filters on their output to 
knock these down to FCC specs?  Perhaps.  But IMHO, even with a perfectly 
clean signal on the input of an amp, the output will have some spurious 
by-products.  Perhaps they aren't enough to worry about.  I.C.E. claims 
they have never been able to measure them.  I don't know.  I don't have 
the equipment to test it out.

73,

Jon
KE9NA


-------------------------------------
The Second Amendment is NOT about duck hunting!

Jon Ogden
KE9NA

http://www.qsl.net/ke9na 

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


--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm


<Prev in Thread] Current Thread [Next in Thread>