[Amps] Alpha 87 (not 87A)

[Jeff]

It's true that a mistuned amp can generate plenty of harmonic energy 
content.  Many years ago I was running a 76PA into a resonant but extremely 
narrow banded 160m antenna.  There was a contest going and so I was bumping 
around the band.  You get tired of tweaking the knobs in that case so I just 
backed off on the power and ran around the bands roaming a frequency that 
covered roughly 3:1 or less SWR match.  Over the following week I collected 
an OO card and a few FYI email from guys nice enough to mention that my CW 
2nd harmonic was being copied in the low end of the SSB 80m band.

I've moved since then and have better antennas.  But a feature of all the 
new stuff is a notch on the 2nd harmonic if it's in a ham band.

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: Steve Wright
Sent: Tuesday, November 07, 2017 12:03 PM
To: amps at contesting.com
Subject: Re: [Amps] Alpha 87 (not 87A)

On 08/11/17 07:00, Jim Brown wrote:
> On 11/7/2017 9:44 AM, Steve Wright wrote:
>> People seem to visualise all this heinous crap coming out of their 
>> antenna and taking away everyones' rights, but I challenge any person to 
>> furnish any sort of valid complaint regarding any harmonic.  And I mean a 
>> COMPLAINT, not someone three doors down being able to detect your 3F.
>
> It is a serious mistake to view harmonics as the only product of 
> distortion. Any mechanism that produces harmonics will also produce 
> intermodulation, which shows up as clicks on CW and splatter on SSB. They 
> are two heads of the same snake. We can kill harmonics by filtering them, 
> but we can't do that with IMD.

It's an even more serious mistake to overtly self-police when there are
no issues to fix.

FURNISH THE COMPLAINT.


S

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