[TenTec] SOTA RADIO

[Jim Brown]

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