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WSPR TX Time Charts

"Paul KE7HR"
 

I put a series of WSPR TX time charts in the Photos section. They show the time slot for various start times and frame settings. For the 00 start time, the chart will be valid after the first hour since the transmit starts in the first available slot and that it likely to be a random time. It was easier for me to see the transmit times on a chart...

Paul KE7HR
Hans Summers
 


Hi Paul?

For the 00 start time, the chart will be valid after the first hour since the transmit starts in the first available slot and that it likely to be a random time. It was easier for me to see the transmit times on a chart...

It's obviously not a particularly critical thing, but this one is interesting. Are you sure? I just checked in the code and I couldn't see how that would happen? I'll try to reproduce it here too!

73 Hans G0UPL
"Paul KE7HR"
 

Hans,

I may be in error and was only thinking of when I was testing with frame of 02, so it would start as soon as possible.

I do find it interesting that for the frame settings that do not come out equal into the 60 minutes, that there is a "short" interval before it resets to the start time value. That was one of the things that caused me to build the chart.

Paul KE7HR

--- In QRPLabs@..., Hans Summers <hans.summers@...> wrote:

Hi Paul

For the 00 start time, the chart will be valid after the first hour since
the transmit starts in the first available slot and that it likely to be a
random time. It was easier for me to see the transmit times on a chart...
It's obviously not a particularly critical thing, but this one is
interesting. Are you sure? I just checked in the code and I couldn't see
how that would happen? I'll try to reproduce it here too!

73 Hans G0UPL
"andyfoad@..."
 

I am watching this one with interest too.

I have a U2 which I initially used with no GPS.

I calibrated the clock frequency correctly and left the U2 on WSPR
witn NO problems. After a day the U2 was transmitting correctly
in each assigned time slot.

BUT - if yiou switch the U2 off and then restart it (perhaps after
an LPF change) then you MUST recalibrate the system clock again,
because quartz xtals have a habit of not returning to their
original operating frequency even after warming up.

That would make the WSPR timings start to wander, e.g start at 10
seconds past the minute and getting progressively worse as time
goes on (timings maybe lagging or leading).

The moral of the story is ALWAYS recalibrate the systemn clock
to the xtal frequency after switching off ;-)

73 de Andy

--- In QRPLabs@..., "Paul KE7HR" <ke7hr@...> wrote:

Hans,

I may be in error and was only thinking of when I was testing with frame of 02, so it would start as soon as possible.

I do find it interesting that for the frame settings that do not come out equal into the 60 minutes, that there is a "short" interval before it resets to the start time value. That was one of the things that caused me to build the chart.

Paul KE7HR
g3zjo
 

On 11/06/2013 15:35, andyfoad@... wrote:
The moral of the story is ALWAYS recalibrate the systemn clock
to the xtal frequency after switching off ;-)
Hmm I was hoping for better than that, I have several Home Brew WSPR PIC MEPT's, PIC Xtal Clock sets the timing, WSPR time is accurate for months, I switch them on and off at will and they are always stable. I fetched an un used one out of the drawer after 2 years and it was still spot on.
Mind you with a GPS connected its irrelevant.

73 Eddie G3ZJO (stable sort of fellow)

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