--- In QRPLabs@..., g3zjo <g3zjo@...> wrote:

Ah thank you Sir Foad

Oh no, not another gong ;-)

I've just had a thought to recheck my 125Mhz DDS clock frequency.

I did notice a shift by 25Hz when I plonked the heat shieled on the
DDS module but didn't think anymore about it.

Just rechecked and recalibrated it as close as I could using just
the expected beat note from the RX to Spectran, so it's still not
perfect until I calibrate using my proper freq counter.

Lo and behold I know get a 6Hz wide trace and 28Mhz decodes
properly.

Still looks like 3 data bit streams but it decodes now !

Hans:

Any chance the next software upgrade can have a TEST menu on it,
a bit like the old MK1 whereby you can have just a steady carrier
output only, free of anything being applied to it so that we can
do the following easier -

U2 is on and left to stabilise.
I always assume a warm up period with anything of 30 mins.
My xtal in the Mk1 takes 20-30 mins to heat stabilise.
Then once we're happy of the warm up period the TEST mode can be
invoked, the user's frequency counter can measure the actual RF out
and then the DDS ref freq setting can be altered ?

Actually it might be a nice extra to have a TEST2 mode, that
ramps up and down the WSPR data bit stream freqs so that it's easy
to see what's happening by eye.

As I'm typing this I have the AF output from the FT817 across the room
and I'm typing this message on the laptop.

WSPR is running on the lappy and being picked up by the internal
microphone.

WSPR software is showing me a string of decodes on 28Mhz even though
there's a bit of drift caused by the U2 kit being naked on the table
top!

So far so good.

But lets be careful here, all our collective posts are being sent
almost real time so it's easy to make mistakes or give the wrong
impressions. Just so long as we realise that ;-)


73 all de Andy

开云体育

On 18/05/2013 13:26, andyfoad@... wrote:

I've just had a thought to recheck my 125Mhz DDS clock frequency.

Odd. As such calibrating will / should do nothing to the signal data as long as you are in the WSPR window which you can see for yourself anyway. The GPS does it spot on anyway.
OK test in my mind, silly but gotta do it.

Still looks like 3 data bit streams but it decodes now !

No must be 4 data Units, Joe Taylor told me off for calling them bits :-) :-) :-)?? He got the same sort of answer though, you know what I mean.

73 Eddie

Yep. Odd thing is I decided to put the rig live on 10m and the
trace went funny. So it wasn;t the DDS ref afterall then.

Just plonked it on 30m now. Whaddya know - I can see all 4 bit
streams for the 1st time.

Gonna leave the nude pcb running live for a few hours on 30m
while I go out.

Excuse the drift whilst its in the nude ;-)