Transmit Equalizers and FT4/8

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Transmit Equalizers and FT4/8

N4ZR
I normally run my K3's TX equalizer to minimize low frequencies and
frequencies above 2000 Hz.  Am I right to assume that I should set it
back to flat when doing FT4/8?

--

73, Pete N4ZR
Check out the Reverse Beacon Network
at <http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.

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Re: Transmit Equalizers and FT4/8

Joe DeVincentis
If you run in data mode, the TX and RX equalizers are taken out of the loop.  No need to reset them.

Joe, KO8V

> On Aug 29, 2019, at 09:33, N4ZR <[hidden email]> wrote:
>
> I normally run my K3's TX equalizer to minimize low frequencies and frequencies above 2000 Hz.  Am I right to assume that I should set it back to flat when doing FT4/8?
>
> --
>
> 73, Pete N4ZR
> Check out the Reverse Beacon Network
> at <http://reversebeacon.net>, now
> spotting RTTY activity worldwide.
> For spots, please use your favorite
> "retail" DX cluster.
>
> ______________________________________________________________

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Re: Transmit Equalizers and FT4/8

Don Wilhelm
In reply to this post by N4ZR
Pete,

If you are using DATA A mode, that is done for you automatically.
OTOH, if you are "doing it the hard way" and using USB, then the answer
is yes, and also set compression to zero.

73,
Don W3FPR

On 8/29/2019 9:33 AM, N4ZR wrote:
> I normally run my K3's TX equalizer to minimize low frequencies and
> frequencies above 2000 Hz.  Am I right to assume that I should set it
> back to flat when doing FT4/8?
>
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Re: Transmit Equalizers and FT4/8

Mark Musick
In reply to this post by N4ZR
Pete,
For FT4/FT8 or any other digital mode TX Equalization is set flat automatically when you select DATA mode.

73,
Mark, WB9CIF

-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of N4ZR
Sent: Thursday, August 29, 2019 13:34
To: Elecraft List <[hidden email]>
Subject: [Elecraft] Transmit Equalizers and FT4/8

I normally run my K3's TX equalizer to minimize low frequencies and frequencies above 2000 Hz.  Am I right to assume that I should set it back to flat when doing FT4/8?

--

73, Pete N4ZR
Check out the Reverse Beacon Network
at <http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.

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Re: Transmit Equalizers and FT4/8

donovanf
Hi Pete,


Are you sure that your minimizing SSB voice frequencies above 2000 Hz?
I hope that's a typo, because its fundamentally incorrect.


Its perfectly okay to use SSB mode with FT8 and other digital modes,
but you MUST set TX equalization to flat and CMP to fully
counterclockwise. The MIC level must be set so with the fifth ALC
bar just flickering, this assures that ALC is off.


73
Frank
W3LPL




-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of N4ZR
Sent: Thursday, August 29, 2019 13:34
To: Elecraft List <[hidden email]>
Subject: [Elecraft] Transmit Equalizers and FT4/8

I normally run my K3's TX equalizer to minimize low frequencies and frequencies above 2000 Hz. Am I right to assume that I should set it back to flat when doing FT4/8?

--

73, Pete N4ZR
Check out the Reverse Beacon Network
at <http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.

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Re: Transmit Equalizers and FT4/8

N4ZR
No, that was indeed a typo.  The way it is normally set for SSB
emphasizes the highs. Trouble is, I don't operate phone enough to catch
things like that hi.

73, Pete N4ZR
Check out the Reverse Beacon Network
at <http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.

On 8/29/2019 10:29 AM, [hidden email] wrote:

> Hi Pete,
>
> Are you sure that your minimizing SSB voice frequencies above 2000 Hz?
> I hope that's a typo, because its fundamentally incorrect.
>
> Its perfectly okay to use SSB mode with FT8 and other digital modes,
> but you MUST set TX equalization to flat and CMP to fully
> counterclockwise.  The MIC level must be set so with the fifth ALC
> bar just flickering, this assures that ALC is off.
>
> 73
> Frank
> W3LPL
>
>
> -----Original Message-----
> From: [hidden email]
> <[hidden email]> On Behalf Of N4ZR
> Sent: Thursday, August 29, 2019 13:34
> To: Elecraft List <[hidden email]>
> Subject: [Elecraft] Transmit Equalizers and FT4/8
>
> I normally run my K3's TX equalizer to minimize low frequencies and
> frequencies above 2000 Hz.  Am I right to assume that I should set it
> back to flat when doing FT4/8?
>
> --
>
> 73, Pete N4ZR
> Check out the Reverse Beacon Network
> at <http://reversebeacon.net>, now
> spotting RTTY activity worldwide.
> For spots, please use your favorite
> "retail" DX cluster.
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> 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]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> 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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Transmit Equalizers and FT4/8

ANDY DURBIN
In reply to this post by N4ZR
"Am I right to assume that I should set it back to flat when doing FT4/8?"

If you do FT4 and FT8 right, as in using WSJT-X "split mode", the signal modulation frequency cannot be outside the range 1,500 to 2,000 Hz.  Why would it be desirable to have a flat TX equalizer response?

Flat is certainly desirable for RX and for some rigs Flat is not the same a None.

73,
Andy, k3wyc




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Re: Transmit Equalizers and FT4/8

Barry-2
Andy,
     First, I suggest that you use data A mode. This will automatically
set the equalizer and audio compressor correctly making it so that you
don't need to play with adjustments, except level.

     Second, the tones used CAN be much lower than 1500 Hz. I have worked
station that were down to 200 Hz. And the the tones can go as high as
the sending stations transmitter will allow, typically less than 2.7-2.8
KHz. This assume that that you have tuned your radio the the FT8/FT4
frequencies correctly.


73,
Barry
K3NDM

------ Original Message ------
From: "Andy Durbin" <[hidden email]>
To: "[hidden email]" <[hidden email]>
Sent: 8/29/2019 12:15:08 PM
Subject: [Elecraft] Transmit Equalizers and FT4/8

>"Am I right to assume that I should set it back to flat when doing FT4/8?"
>
>If you do FT4 and FT8 right, as in using WSJT-X "split mode", the signal modulation frequency cannot be outside the range 1,500 to 2,000 Hz.  Why would it be desirable to have a flat TX equalizer response?
>
>Flat is certainly desirable for RX and for some rigs Flat is not the same a None.
>
>73,
>Andy, k3wyc
>
>
>
>
>______________________________________________________________
>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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Re: Transmit Equalizers and FT4/8

Bob McGraw - K4TAX
In reply to this post by ANDY DURBIN
Equalizers introduce phase shift.  Even the very best ones do that.  
Thus for a phase shift audio signal, either transmitted or received, use
of any EQ can and will introduce phase shift in the audio path.   It is
not at all advisable to have this occur with digital signals.

It is highly advise about to use SPLIT function with WSJT-X, FT-4 and
FT-8 modes.  If your radio is old and slow and does not quickly switch
between VFO A and VFO B, the Fake It is suggested.

73

Bob, K4TAX


On 8/29/2019 11:15 AM, Andy Durbin wrote:

> "Am I right to assume that I should set it back to flat when doing FT4/8?"
>
> If you do FT4 and FT8 right, as in using WSJT-X "split mode", the signal modulation frequency cannot be outside the range 1,500 to 2,000 Hz.  Why would it be desirable to have a flat TX equalizer response?
>
> Flat is certainly desirable for RX and for some rigs Flat is not the same a None.
>
> 73,
> Andy, k3wyc
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
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>
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> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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Re: Transmit Equalizers and FT4/8

ANDY DURBIN
In reply to this post by Barry-2
" the tones used CAN be much lower than 1500 Hz. I have worked station that were down to 200 Hz. And the the tones can go as high as the sending stations transmitter will allow, typically less than 2.7-2.8 KHz.

The transmitted signal frequency is the suppressed carrier frequency plus the modulation frequency.  The presence of a signal at 200 Hz, or 4,000 Hz, in your receive waterfall  is not in conflict with the transmitter modulation frequency being in the range 1,500 to 2,000 Hz.

If you have an open mind you may learn something from this paper -

https://www.dropbox.com/s/85aoc937kz235iq/FT8%20audio%20harmonics%20draft%20d%20k3wyc.pdf?dl=0

Pay particular attention to the Part 2 - Discussion of WSJT-X split mode.

73,
Andy, k3wyc


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Re: Transmit Equalizers and FT4/8

Jim Brown-10
In reply to this post by N4ZR
Pete,

Digital A is the correct K3 setting for all digital modes except RTTY.
The equalizer is disabled in Digital A. The computer should feed the
Line Input.

Both the KPA500 and KPA1500 are least efficient on 6M, which means that
they produce the greatest heat on that band. My KPA1500 arrived July 6,
right in the middle of E-skip season on 6M. I ran it as close as
possible to 1500W, always using WSTT-X for either FT8 or MSK144. It got
hot enough for the fans to get loud after 10-15 minutes, and eventually
they get SCREAMING LOUD. But the amp continues to be happy. When it
isn't, it will back off power a dB or two.

I haven't used it much on HF yet, but those who have report that it's
reasonably quiet in heavy duty CW or SSB contesting use.

73, Jim K9YC

On 8/29/2019 6:33 AM, N4ZR wrote:
> I normally run my K3's TX equalizer to minimize low frequencies and
> frequencies above 2000 Hz.  Am I right to assume that I should set it
> back to flat when doing FT4/8?

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