[Elecraft] [K3] KAT3 not functioning on 6m

[Bill Coleman]

This is a feature of WSJT-X. If you have the Split Operation selection set to “Rig”, WSJT-X will always use Split mode.

It sets the transmit frequency higher or lower in 500 Hz increments. The main reason for this is to keep the generated audio in the middle of the SSB passband, but high enough to allow harmonics to be outside the passband.

So, for example, if you select 400 Hz as your transmit frequency, WSJT-X will set the TX frequency 1.5 kHz lower, and then generate transmission tones around 1900 Hz. If you set the frequency to 2000 Hz, it will set the TX frequency 500 Hz higher, but the tone generated is about 1500 Hz.

The net result is the same — the transmitted tones are always between 1500-1999 Hz.

And even if you select a transmit frequency between 1500-1999 Hz, WSJT-X will always use split operation. (Although in this case, the RX and TX frequency will be identical)

> On Sep 6, 2020, at 4:40 PM, <exbpi at comcast.net> <exbpi at comcast.net> wrote:
> 
> Bill,
> 
> Why are you running split in WSJT? The only time you actually need split is when operating 2 different frequencies like working JA's on 160 when they used to be required to transmit on 1908 KHz and we transmitted on 1840 kHZ (they now can operate on 1840). Unless you are actually needing to receive on one frequency and transmit on another, set the radio configuration to "Fake It" instead of "split". That will keep your transmit frequency in the middle of your transmit bandpass. There is no actual frequency change in WSJT including DX expedition mode.
> 
> GL
> 
> Mike
> K7PI
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Bill Coleman
> Sent: Sunday, September 6, 2020 13:08
> To: w4sc <w4sc at windstream.net>
> Cc: Elecraft <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] [K3] KAT3 not functioning on 6m
> 
> OK, I figured this out, sort of.
> 
> Every time I’ve had trouble with the KAT3 not tuning, the K3 has been in split mode.
> 
> By taking the K3 out of split mode, I’m able to turn on 6m correctly.
> 
> Oddly, though, when I return to split mode, it still works. 
> 
> I’m not sure why I see this issue, but I’m glad I can work around it.
> 
> Split mode is often configured due to the WSJT-X settings, depending on the frequencies used.
> 
>> On Sep 5, 2020, at 9:01 PM, w4sc <w4sc at windstream.net> wrote:
>> 
>> Bill,
>> 
>> I had an issue very similar.  The “Automatic TXGain” procedure is performed at 52 MHz.  I was using a 50 ohm load attached, and at 50.125 the KAT3 have trouble matching the load.  Also it appears there is not enough power out in the lower part of the band for the SWR bridge to function.
>> 
>> Part of the problem is I believe, the f/w switches the KPA3 ON at 8  watts instead of the usual 12………..
>> 
>> Performing a MANUAL TX Gain procedure on 6M may help.
>> 
>> Here is link to post I made several weeks ago.
>> 
>> https://www.mail-archive.com/elecraft@mailman.qth.net/msg241436.html
>> 
>> 73 de Ben W4SC
>> 
>> Sent from Mail for Windows 10
> 
> Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
> Web: http://boringhamradiopart.blogspot.com
> Quote: "Not within a thousand years will man ever fly!"
>            -- Wilbur Wright, 1901
> 
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Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901