[KX3] Digital transmissions problems solved finally

[Gary Hawkins]

With considerable help from Don Wilhelm (greatly appreciated), and after
several conversations with Elecraft I finally solved by JT65/JT9
transmission issues.  The equipment was PC running WSJT-X/HRD and an
unmodified Signalink.  WSJT-X was in transmit mode, I could hear the
tones using the Mon connector on the Signalink, the audio tones were
making it to the tip of the KX3 Mic connector (used amplified audio amp
connected to tip and Ring 2), and yet the ALC would not go above zero
and nothing was being transmitted by the KX3 no matter how I set up the
mic level and various Windows/Signalink level controls.

The identified problem - I was trying to transmit the test Tone and JT9
signal above the 2.8KHz upper bandwidth limit on the TX path of the
KX3.  No matter what you have the RX bandwidth set to, the maximum audio
frequency that will go through the transmit chain is 2.8kHz.

Hope this information saves someone else a lot of trial and error trying
to determine what's gone wrong in their digital setup.

73's Gary K6YOA
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[KEN-3]

Some of t he JT-65/JT-9 software has a +2 kHz offset option that moves
the transmit carrier up 2 kHz to keep it in the proper transmit bandpass.

Ken WA8JXM

On 18/07/2015 00:01, Gary Hawkins wrote:
> The identified problem - I was trying to transmit the test Tone and
> JT9 signal above the 2.8KHz upper bandwidth limit on the TX path of
> the KX3.  No matter what you have the RX bandwidth set to, the maximum
> audio frequency that will go through the transmit chain is 2.8kHz.

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[Bob McGraw - K4TAX]

Correct.  JT-65 has common frequencies on each band.  Then JT-9 is about
2 kHz higher from JT-65, thus the move in frequency.  There is a box to
be checked on the application when changing from JT-65 to JT-9.  It is
best if the radio is under CAT control. Most issues in this regard are
resolved by the software.

73 Bob, K4TAX

On 7/18/2015 11:53 AM, WA8JXM wrote:

> Some of t he JT-65/JT-9 software has a +2 kHz offset option that moves
> the transmit carrier up 2 kHz to keep it in the proper transmit bandpass.
>
> Ken WA8JXM
>
> On 18/07/2015 00:01, Gary Hawkins wrote:
>> The identified problem - I was trying to transmit the test Tone and
>> JT9 signal above the 2.8KHz upper bandwidth limit on the TX path of
>> the KX3.  No matter what you have the RX bandwidth set to, the
>> maximum audio frequency that will go through the transmit chain is
>> 2.8kHz.
>
> ______________________________________________________________
> 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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