Hi Steve and all,
I'm starting to plan a Band Hopping implementation for WSJT-X, and I
appreciate having your suggestions.
Suppose we have four columns of band-activation buttons: Day, Night, and
morning and evening gray lines. We already have the necessary
astronomical routines in place, so in principle WSJT-X knows when
sunrise and sunset occur. We could therefore choose the transition
times between one set of bands and the next automatically. What would
be the best indicator of the time to switch? Something like half an
hour before/after sunrise or sunset? Or some other criterion?
Including a facility to call a user_hardware script before each 2-minute
window should be no problem: earlier versions of WSPR do that, and it
works well.
-- Joe, K1JT
On 5/13/2015 10:45 PM, Steven Franke wrote:
> Hi Joe,
> I tried the latest wsjt-x_exp this evening on Ubuntu 14.04 and it worked
> great! My regular hopping setup uses gnuradio to read the TS-480's audio from
> a sound card and write it to a .wav file. I send xmlrpc commands to stop and
> start recording. I was surprised to find that I could start wsjt-x "on top"
> of my program, and have it listen to the same sound card that my gnuradio
> program was recording.
>
> I see that you intend to add band hopping. That's great! It'd be nice if
> you'd include the facility to call a user_hardware script before each
> 2-minute window. I need this to control antenna and filter switches. The next
> interval's frequency could be provided as an argument to the user_hardware
> script.
>
> While you're at it, how about 4 hopping schedules that can be run during a 24
> hour cycle? Day, night, and sun rise-set transition windows... That's what I
> use here, but it's orchestrated by a cron job. It'd be nice to be able to
> control it from within your slick GUI. It would be sufficient to have 4 rows
> of band buttons to select the active bands, and set the transition times.
>
> Thanks for the very cool program!
>
> 73 Steve k9an
>
>> On May 13, 2015, at 12:05 PM, Joe Taylor<j...@princeton.edu> wrote:
>>
>> Hi Edson,
>>
>> PY2SDR wrote:
>>> Would it add too much complexity to have the frequency error correction in
>>> the audio base band of the decoders? This would prevent having to re-tune
>>> the rig and would also allow crystal controlled transceivers to also have
>>> frequency error correction.
>>
>> This could be done, of course. For a single-band crystal controlled
>> WSPR rig the number from a "Frequency correction" entry widget (a
>> spinner control, say) could be used to alter the (audio) frequency range
>> covered by the decoder, fix up the reported frequencies of decoded
>> signals, and adjust the frequency of Tx audio tones.
>>
>> For some years already, production WSPR versions have included the
>> ability to set a "BFO frequency" to something other than 1500 Hz. I
>> think that could accomplish the necessary recalibration for the crystal
>> controlled case.
>>
>> But under normal circumstances with rig control, I see little
>> disadvantage to retuning the radio. We have all the tools in place, and
>> they work well. Several people have been testing JT4 on the 10 GHz EME
>> path in recent weeks, using the automatic Doppler control (both Tx and
>> Rx) now in v1.6.1. They are delighted with it!
>>
>> -- Joe, K1JT
>>
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