If you run in data mode, the TX and RX equalizers are taken out of the loop. No need to reset them.
> 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
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> For spots, please use your favorite
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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.
"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.
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
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.
" 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 -
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
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?