EQing has three unique dependencies; your voice, the mic and the mic preamp
circuitry.
To some degree, all those using a FLEX-x000 have the same mic preamp circuitry
unless you are using outboard equipment so the frequency response of it is
mostly a constant. The frequency response characteristics of the mic preamp
circuitry in a FlexRadio SDR is flat as a board and that makes EQing easier
since there is no frequency pre-emphasis junk to accommodate.
Mics and your voice characteristics are two very different beasts altogether.
Ideally you want the microphone's frequency response to be flat across its
range too, but that just doesn't happen unless you get a real expensive
microphone. Also mics have coloring characteristics that is either going to
compliment or detract from the audio source (in this case, your voice)
In regards to your voice, an EQ is not going to make you sound better, just
different. The goal of EQing is to make you sound like yourself over the
radio. Yes, you can add a bunch of 1-2K emphasis to enhance communication
quality audio or add a bunch of low end bass to give your audio that boomy
broadcast sound, but that shouldn't be your primary objective of using an EQ.
The bottom line is that no one can tell you how to set your EQ as it is unique
to every person. There is only one way to do it; listen to yourself in a
second receiver with an adequately wide RX filter and set the EQ until you
think you sound like yourself. Once of the easiest ways to do this is to find
another Flexer and have them record you off the air and play is back for you to
listen to and tweak your EQ.
Also EQing is an art based in science. You will get a billion different
opinions on how to do it, but my recommendation is to cut heavy and increase
light. Boosting frequencies to high levels is not going to add frequency
content that was not there to begin with. Cutting over emphasized frequencies
can make a world of difference.
Here is a good KB article on EQing
http://kc.flex-radio.com/KnowledgebaseArticle50114.aspx
On the FLEX-3000 running AM, I'd use the max TX filter width of 3650 Hz. I
don't know that you need more bandwidth, but something out to 4K might be
better suited for symmetrical phone modes but how much more fidelity do you
really achieve with an additional 350 KHz on the upper end? Using a FLEX-5000
that can achieve much wider TX bandwidths, I cannot hear much difference
between 3650 and 4000 Hz, but I am not a diehard AMer.
-Tim
-Original Message-
From: flexradio-boun...@flex-radio.biz
[mailto:flexradio-boun...@flex-radio.biz] On Behalf Of James C.Miller
Sent: Friday, June 18, 2010 6:05 AM
To: flexradio@flex-radio.biz
Subject: [Flexradio] AM Mode on the Flex 3000
I have had great response from those receiving my signal in the AM Mode
when transmitting from the Flex 3000.
My question is to other users of the Flex 3000, What settings do you find
best on the 10 band EQ when transmitting,and how far out do you set your
transmit filtering ?
Maximum 3.650 or lower. Some have commented that there is a need for more
high end frequency response.
Thanks 73's from KB2RSK Jim
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