On 5/16/2012 10:42 PM, Jim Brown wrote:
> With some receivers it certainly does, especially those that are power
> or supply voltage limited. BUT -- I like to think that I know the
> difference between my ham rig and my home entertainment system.
I KNOW I know the difference, and kinda resent
the sarcastic implication... ;-)
> FWIW, for ham radio at home, headphones have ALWAYS been my primary mode
> of operation. I use a loudspeaker only for casual listening.
ME TOO... in fact I am a huge headphone / headset
junkie. I am blessed in that my XYL does not whine
about me spending money on stuff... including another
headset. We both use the best wireless headphones
for listening to old time radios shows - the sound never
alters no matter where we roam throughout the place.
Makes raiding the fridge safe - we never miss any of
the show even though we leave the room.
My preference on headsets is also related to the fact
the microphone is always a close talking type, which
stays put in the same place, no matter how far back
from the desk I lean, or whether I turn my head
from side to side, etc. A close-talking microphone
tends to be more noise rejecting (I don't like the
term noise cancelling... but that is another topic
for another day....)
Every
> radio I've ever owned has had quite adequate drive for headphones. On
> the other hand, a mobile radio, including a talkie, needs enough audio
> to get over ambient noise, and many of these rigs don't.
> 10% distortion is a standard spec for industrial paging systems.
I suspect this tends to reinforce my point...
I think... ;-)
> 10% distortion is a standard spec for industrial paging systems.
That's the distortion at the peak of the signal just below clip,
and is typical of many computer sound cards.
Geeze...are you sure about that ?
I have been testing sound cards and microphones for
speech recognition companies since 1992... and no sound
card I ever used was rated at 10% THD.
Typical specifications for cards in my machine might
look like this:
Output THD+N at 1kHz (Front-out) : <0.0025 %(-92 dB)
Input THD+N at 1kHz : <0.0022 %(-93 dB)
Even the venerable old Creative Soundblaster Audio PCI 16
had numbers like this back in the 1990s :
Signal to Noise Ratio: 90 db
Total Harmonic Distortion @ 1 Vrms (10 KOhm load): 0.01%
I cannot address the rest of the post, as I am embarrassed
to admit I don't follow how it relates to the topic of ham
radio audio ... sorry.
------------------------ K8JHR -----------------------
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