[Amps] Advice: harmonics from Alpha 91B on 160

[Hardy Landskov]

I had an Alpha 91B and I am sure it had some harmonic content but I never 
had a complaint.  All  amplifiers have harmonics and some more than others 
due to the exiter, design, and the phase relationship with the amp.  What 
was the level of the harmonics in dBm? You can't tell where the problem lies 
unless you measure each component of the system. It might be in spec right 
now but until the levels are measured no one knows if it is out of spec 
usually in a 50 ohm system. Another problem is the load as seen by the third 
harmonic could be quite reactive thereby exagerating the harmonic level. Are 
you seeing this on another antenna?
Why would anyone go to that frequency in the first place?
Hardy N7RT

----- Original Message ----- 
From: "gds" <gerys1 at verizon.net>
To: <amps at contesting.com>
Sent: Saturday, January 30, 2010 8:51 PM
Subject: [Amps] Advice: harmonics from Alpha 91B on 160


>
> A friend of mine is using an Alpha 91B on 160 and is noticing harmonics 
> around 5.595 MHz. (3rd order)
>
> Is this a problem that has been noticed with the 91B?  Anyone know of a 
> solution?
>
> Tks very much.
>
> Gerry
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