Tim,
Thank you for the excellent articles regarding the optimal voice
settings. As an avid SSB user and supporter and opponent of the double
sideband AM since the mid 50's, I have been wondering why the people
want to waste the scarcest nature's resource of HAM-radio, the
electromagnetic spectrum, by sending unnecessary broad badwidth and
high power at audio frequency bands that don't convey the information
efficiently.
In addition to those articles, I want to remind you of two other texts
that help understanding the importance of proper EQ and signal
processing, if you want to transmit the highest intelligibility at the
lowest peak limited power:
http://kotisivu.dnainternet.net/ahti/sdr-1000/filtclip.pdf
http://kotisivu.dnainternet.net/ahti/sdr-1000/speechproc.pdf
Since 1970 I am using these principles in all my home-brew rigs and
even modified my rice-boxes. Unfortunately I have not yet been able
to implement that feature in my several SDR-1000s.
73, Ahti OH2RZ
On 07/01/07, Tim Ellison [EMAIL PROTECTED] wrote:
To all,
Two new Knowledge Base articles related to optimal voice operation have
been posted. The first, Q10342 - Why is there a 160 Hz Notch Filter for
Phone Use? http://kb.flex-radio.com/article.aspx?id=10342, explains why
there is a notch filter for this frequency in the PowerSDR EQ.
The second, Q10343 - Rules for EQing Voice for Optimal Phone and AM
Operation, http://kb.flex-radio.com/article.aspx?id=103423 goes into
great detail of how to set your EQ for voice recording and broadcasting.
-Tim
KB Administrator
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