KX3 Transmit EQ Settings

[k4mmg.ham]

Any suggestions on what EQ settings for good SSB communication using the Elecraft hand mic?

Any suggestions on what EQ settings for good SSB communications using any other type of mike?

I am not seeking any fancy audio profile.
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[Matt Zilmer-3]

Best is to eliminate the low (50, 100, 200 Hzbands).  These contribute
nothing to intelligibility, and the MH3 has frequency response below 400
Hz, so you'd just be wasting energy because of this.  With the low bands
at 0dB, I got reports of muddy audio.

I would also suggest a mid-band boost, say at 1.6 and 2.4 KHz, of 3 to 5
dB.  This will assist intelligibilityin general.

I'm using these settings on a K3, KX3, and on a KX2 with different
microphones, and all of them produce excellent voice audio as reported
on-air.

73,

matt W6NIA


On 11/9/2016 1:28 PM, [hidden email] wrote:

> Any suggestions on what EQ settings for good SSB communication using the Elecraft hand mic?
>
> Any suggestions on what EQ settings for good SSB communications using any other type of mike?
>
> I am not seeking any fancy audio profile.
> ______________________________________________________________
> Elecraft mailing list
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--
Always store beer in a dark place.  - R. Heinlein

Matt Zilmer, W6NIA
[Shiraz]

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[John Oppenheimer]

The Heil site as some suggestions here:
https://www.heilsound.com/amateur/support/dsp-settings/all-things-elecraft

Using a K3/P3 to measure the response curve, I use:
-16 -16 -16 -2 +3 +9 +16 +8

John KN5L

On 11/09/2016 03:28 PM, [hidden email] wrote:
> Any suggestions on what EQ settings for good SSB communication using the Elecraft hand mic?
>
> Any suggestions on what EQ settings for good SSB communications using any other type of mike?
>
> I am not seeking any fancy audio profile.
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[Jim Brown-10]

On Wed,11/9/2016 9:21 PM, Walter Underwood wrote:
> That “ideal curve” assumes an LC receive filter with a roll off on the high (and low) frequencies. That peak is a pre-emphasis on the high end to correct for the receive filters. Modern crystal filters and FIR filters don’t have that roll off, so it is not needed.

That's not true. There's nothing magic about "modern" filters -- filters
implemented in DSP emulate filters made with physical components. ANY
filter has skirts that we think of as only amplitude, but they also have
phase response. Can't have one without the other. It's just that DSP
filters can be made far more complex, so they can emulate physical
filters that would be FAR too complex to actually build, so amplitude
and phase response can be improved.

For ALL communications circuits where speech intelligibility is the
primary goal, octave-band TXEQ should have the 60, 120, 240 Hz bands set
for maximum cut, the 500 Hz band set by ear for something like 6-12 dB
cut, the bands around 2.5-3.5 kHz should be set for 3-6 dB of peaking,
and all other bands should be set "flat" -- that is, to 0 dB. In
general, using "boost" EQ more than about 6 dB is a bad idea, because it
tends to use up headroom and make it more likely that the signal path
will clip on peaks.

In Elecraft rigs, the IF filters are in DSP. The only crystal filters
are roofing filters, and they have that name because they protect the
DSP filters from overload by strong signals near, but outside, the DSP
filter's passband.
> Maybe it works for your own voice and that’s great. But it is a choice, not a standard setting.

Yes. The settings I've listed are for a generic "flat" microphone,
without a "tailored" response. Some ham mics, including some Heil and
Shure models, have a peak around 3 kHz, and these mics should NOT be
used with an additional 3 kHz peak in TXEQ.

BTW -- Bob Heil did NOT invent that concept. Shure was doing it in the
earliest days of SSB (the '50s), and the D104 is a pretty old mic too.
And the other great US mic company in those days was Electro-Voice,
which was led by Al Kahn, K4FW, who later started Ten Tec when his
partner, Lou Burroughs, wanted to sell the company and retire. Al was a
CW man -- I don't know if they ever did any ham mics. :)  But they OWNED
the market for broadcast mics, and to some extent still do -- their RE20
is THE prestigious talk show and DJ mic, and their 635 and DO54 were
wildly popular for reporters in the field.

73, Jim K9YC
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[Richard Lamont]

On 09/11/16 21:28, [hidden email] wrote:

> Any suggestions on what EQ settings for good SSB communication using the Elecraft hand mic?
>
> Any suggestions on what EQ settings for good SSB communications using any other type of mike?

Good intelligibility seems to coincide with having roughly equal power
per unit bandwidth. So look at the waterfall on a convenient WebSDR and
see where the peaks and troughs in your signal are, then tweak
accordingly. There's little point in having anything below 300 Hz unless
you wish to be mistaken for Barry White.

--
Richard Lamont G4DYA
<[hidden email]>
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[Paul Van Dyke]

Since I am in the field I can't check, but at some past point, I put a file
in the folder with suggested EQ settings they've been used by many
including WG0AT and found them very useful.

Paul  KB9AVO

On Nov 10, 2016 4:14 AM, "Richard Lamont" <[hidden email]> wrote:

> On 09/11/16 21:28, [hidden email] wrote:
>
> > Any suggestions on what EQ settings for good SSB communication using the
> Elecraft hand mic?
> >
> > Any suggestions on what EQ settings for good SSB communications using
> any other type of mike?
>
> Good intelligibility seems to coincide with having roughly equal power
> per unit bandwidth. So look at the waterfall on a convenient WebSDR and
> see where the peaks and troughs in your signal are, then tweak
> accordingly. There's little point in having anything below 300 Hz unless
> you wish to be mistaken for Barry White.
>
> --
> Richard Lamont G4DYA
> <[hidden email]>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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[Jim Brown-10]

On Thu,11/10/2016 2:13 AM, Richard Lamont wrote:
> Good intelligibility seems to coincide with having roughly equal power
> per unit bandwidth. So look at the waterfall on a convenient WebSDR and
> see where the peaks and troughs in your signal are, then tweak
> accordingly.

That is NOT a good idea, because speech does not have equal components
over the transmitted bandwidth.

> There's little point in having anything below 300 Hz unless
> you wish to be mistaken for Barry White.

Right.

73, Jim K9YC

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[Edward R Cole]

Jim,

In the 1960's I had an EV664 which I used on 2m AM 150w plate
modulation.  Made very nice AM with my Johnson 6N2.  Mic sat in
storage shed too long and suffered moisture corrosion.

I even applied to work for EV after college.  Ended up LA working for
Hughes Aircraft, instead.

73, Ed - KL7UW

Date: Wed, 9 Nov 2016 22:37:20 -0800
From: Jim Brown <[hidden email]>
To: [hidden email]
Subject: Re: [Elecraft] KX3 Transmit EQ Settings

=====snip
BTW -- Bob Heil did NOT invent that concept. Shure was doing it in the
earliest days of SSB (the '50s), and the D104 is a pretty old mic too.
And the other great US mic company in those days was Electro-Voice,
which was led by Al Kahn, K4FW, who later started Ten Tec when his
partner, Lou Burroughs, wanted to sell the company and retire. Al was a
CW man -- I don't know if they ever did any ham mics. :)  But they OWNED
the market for broadcast mics, and to some extent still do -- their RE20
is THE prestigious talk show and DJ mic, and their 635 and DO54 were
wildly popular for reporters in the field.

73, Jim K9YC


73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag Business e-mail:
     [hidden email]

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[Jim Brown-10]

As you may know, the 664 and 666 were EV's first "variable-D" mics --
the 666 was the pro version, the 664 for "PA." The 666 was known as the
Buchannon Hammer because Lou Burroughs, co-founder of EV with Al Kahn,
demonstrated their ruggedness by using one to drive a nail. (EV was in
Buchannon, MI; Lou taught workshops on microphones, and wrote a great
text on their use.)

Directional mics have "proximity effect" (bass boost when close to the
sound source) that results from their construction -- front and rear
openings to the capsule that cancel sound from the back of the mic.
Variable-D mics have almost none by virtue of one or more additional
openings along the "handle" of the mic. The EV RE16, RE20, and RE27 are
variable-D mics.

73, Jim K9YC

On Thu,11/10/2016 11:24 PM, Edward R Cole wrote:
> Jim,
>
> In the 1960's I had an EV664 which I used on 2m AM 150w plate
> modulation.  Made very nice AM with my Johnson 6N2.  Mic sat in
> storage shed too long and suffered moisture corrosion.
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[John Oppenheimer]

A K3/P3 can be used to measure the KX3 SSB TX bandpass. The process is
to speak random words for several seconds while monitoring with a P3 in
"Peak" mode. After about 30 seconds the display will stabilize.

The K3 filter width is 2.1 KHz 350 - 2450

Here are some measurements:
http://kn5l.net/KX3-TxEq/

John KN5L
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[alorona]

These two sentences contain all of the phonemes (sounds) of the English language and I have found them  useful in adjusting things:

"Joe took father's shoe bench out."

"She was waiting at my lawn."

Al  W6LX




>> The process is to speak random words for several seconds while monitoring

>> with a P3 in "Peak" mode. After about 30 seconds the display will stabilize.
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