[hpsdr] External speaker with Mercury

[Luke Steele]

At 10:48 PM 13/06/2011 +0200, Alberto I2PHD wrote: 
>
> Which magic marketing trick can be used to justify a peak power of 150W 
> starting from an RMS power of just 15W ?    :-) 
> It would take a very anomalous waveform (but perhaps contemporary "music" is
> shaped like that...) 



I think the "industry" uses this term "Peak Music Power Output", which is an
absurd multiple of RMS.
Perhaps it is measured at the odd isolated transient of the waveform at the
most distorted extreme peak.
Then, some of use may claim that all contemporary music is mostly distortion!
Whichever audio amp you use, design plenty of RF bypassing if you intend to
use
it in a transceiver. The gain of the modules is also likely to be much higher
than you need too. Consider also the audio output level required. Look at
commercial transceivers - most have an audio output of a couple of watts. Any
more, and you'll not only annoy the wife, you'll annoy the neighbours!
Luke VK3HJ 
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