Re: KX3 Audio output

Posted by Joe Subich, W4TV-4 on
URL: http://elecraft.85.s1.nabble.com/KX3-Audio-output-tp6412069p6412990.html


 >
http://www.analog.com/en/audiovideo-products/audio-signal-processors/ad1990/products/product.html

One problem with this class of device is the bridge tied outputs.  The
speaker(s) are no longer ground referenced - both sides must float.
This increases RFI issues (not the RF chokes in the output) and will
not allow the use of a three conductor jack for speaker output.

73,

    ... Joe, W4TV


On 5/27/2011 7:51 PM, Brendan Minish wrote:

> The surplus Motorola speaker are truly excellent speakers for radio use,
> both mobile and in the shack.
> They have high efficiency and a frequency response that is ideal for
> Radio use.
>
> I don't know what type of AF amp the KX3 will use but there are now some
> really superb class 'D' switching audio amp chips available that can
> generate lots of clean audio with very high power efficiency
> See
> http://en.wikipedia.org/wiki/Class_D_Amplifier
> and
> http://www.analog.com/en/audiovideo-products/audio-signal-processors/ad1990/products/product.html
>
> Also Motorola made some amplified speakers these are very good for noisy
> vehicles too
>
> On Fri, 2011-05-27 at 12:09 -0700, George Winship, NC5G wrote:
>
>> Thanks Wayne, for your prompt reply. I will check out this out. Presently I
>> use an old Motorola mobile speaker with the IC-730. Most of my mobile ops
>> are in a 1995 3/4 ton Chevy. No CD, but maybe can find an old cassette
>> interface.
>

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