[Elecraft] Subject: Data mode and filters

[Joe Subich, W4TV]

> One caveat: there seems to be two WSJT in use: those that run JT65
> on HF and those who run JT65 on VHF+ (mainly for eme and ms). Some of
> the modes are not compatible and will not decode signals generated by
> the other "flavor" of WSJT. Specifically JT65-HF is not read by
> JT-65A.

Au contraire!  JT65 in WSJT-X by Joe Taylor for HF operation and JT65A
in WSJT-10 are the same.  I have no problem using either package on HF
and 6 meters.  JT65B (2 meters) and JT65C (430 MHz+) are different
animals and are not compatible with WSJT-X or even WSJT-10 when set
for JT65A.

> To run WSJT modes wider than the K3 DSP permits (4-KHz) you can take
> the 1st IF output to a SDR like the LP-Pan which can process 400-KHz
> baseband. Of course the highest bw soundcards run 192-KHz so that is
> another restriction.

There is certainly nothing that would prevent one from demodulating the
entire 50 KHz of "digital" on any band at HF by using an SDR connected
to the IF output of the K3.  The real problem is having software that
can control VFOB in such a way as it will "transceive" with the SDR on
the correct frequency to handle the transmit portion of the system.  It
is still necessary to drive the transmitter with baseband audio in the
500 - 2700 Hz range (preferably 2000 - 2700 Hz to minimize harmonics)
as the K3 has no "transmit IF input".

73,

    ... Joe, W4TV


On 2015-05-06 4:03 PM, Edward R Cole wrote:
> To run WSJT modes wider than the K3 DSP permits (4-KHz) you can take the
> 1st IF output to a SDR like the LP-Pan which can process 400-KHz
> baseband.  Of course the highest bw soundcards run 192-KHz so that is
> another restriction.
>
> I run MAP65 which can process 90-KHz of JT65 if sufficient bw is
> available.  Just about any SDR can convert the 8.215 MHz 1st IF of the
> K3 to provide this.  I use a emu0202 s/c to process the IQ baseband from
> the LP-Pan (as an example).
>
> If you are running a KX3 it offers baseband IQ directly (not sure what
> the bw is as I have not tried my KX3 for WSJT).
>
> One caveat: there seems to be two WSJT in use:  those that run JT65 on
> HF and those who run JT65 on VHF+ (mainly for eme and ms).  Some of the
> modes are not compatible and will not decode signals generated by the
> other "flavor" of WSJT.  Specifically JT65-HF is not read by JT-65A.
>
> I run WSJT only on 6m and higher bands using WSJT10 from Joe Taylor
> (K1JT) who is the creator of WSJT.
>
> 73, Ed - KL7UW
> http://www.kl7uw.com
>      "Kits made by KL7UW"
> Dubus Mag business:
>      dubususa at gmail.com
>
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