[TenTec] SOTA RADIO

[Lee]

  I was following some bunny trails re that Chinese 50 watt amp and saw a 
fairly extensive set of graphs run by one owner and they looked ok. 
Sorry, I don't have the url for that. Maybe someone here knows where 
they are.



-Lee-



WA3FIY

------ Original Message ------
From: "Jim Brown" <k9yc at audiosystemsgroup.com>
To: tentec at contesting.com
Sent: 3/19/2016 2:04:27 PM
Subject: Re: [TenTec] SOTA RADIO

>On Sat,3/19/2016 10:39 AM, geoffrey mendelson wrote:
>>Both MFJ and Ten-Tec bought rights to sell them assembled, and in 
>>order to pass FCC approval had to add output filtering. I forget 
>>which, but one company sold them as two band radios, and the other as 
>>single band.
>
>I would have the same concerns about FCC approval and harmonic 
>suppression with that 50W amplifier being mentioned earlier in this 
>discussion. There's no way a ham should put either of those no-name 
>imports on the air without first checking them for spurs and harmonics 
>with a spectrum analyzer into a dummy load.
>
>Don't have a spectrum analyzer? That's no excuse -- if there are 
>harmonics or spurs, YOU are in violation. Indeed, that's part of the 
>responsibility of having a ham license, and it's why we as hams CAN 
>build stuff without having it FCC approved. We should KNOW, because 
>we've studied, that virtually any ham amplifier creates harmonics that 
>must be filtered. The second harmonic in a power amp is typically only 
>6 dB below the fundamental before the output network filters it! But it 
>still must meet FCC requirements for RF cleanliness.
>
>73, Jim K9YC
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