[hpsdr] External speaker with Mercury

[Mike F]

The amplifier I mentioned (with URL) in my previous email also contains 
a gain (volume) control.  Given that the one audio slider in PSDR 
controls both the headphones and the speaker, I have a gain control on each.

Mike, K7SR
>
> Message: 1
> Date: Tue, 14 Jun 2011 11:25:27 +1000
> From: Luke Steele<mail10 at barefoothorse.com.au>
> To: HPSDR list<hpsdr at lists.openhpsdr.org>
> Subject: Re: [hpsdr] External speaker with Mercury
> Message-ID:<E1QWIco-0002HK-2x at apn-outbound.junkemailfilter.com>
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>
> 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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