Joe,
You can use the 'PIC' code generator in the software to produce a
'pic code' that may be used to key the TX , I think Eddie uses this
system , should be able to give you a pointer , otherwise , the
simplest is the com-port keying option from the software , noting
the CPU loading is minimal in 'TX' [dsp engine is stopped] so 'any'
pc can be used , preferably with web-link to run the Tx beacon and
record the web-distributed decode spots .. as previously noted , the
PSK-Map only retains a over view of decodes , which may not be to
all users expectations , but the that is the design philosophy of the
psk-map , the local web linked copy , should contain 'all' spots
Good luck with the tx , the number of stations showing as 136 was 20
+ last night , with 3 down the east usa coast , would be a good test
under static !
73 -Graham..
PS: Any Varity of the 'wobbly bob' Tx frequency control will do for
Opera [and ros] , afc routines will track drift & jitter
--------------------------------------------------
From: <[email protected]>
Sent: Wednesday, June 19, 2013 7:57 PM
To: <[email protected]>
Subject: Re: LF: VO1NA 137777.0000
Hi Markus and group,
Thank-you very much for the progress report and critique of the many 2200m
photons that have been eminating from my back yard over the past week.
The AD9851 is clocked by a DOCXO that's calibrated against WWV to within
0.1 Hz. Initially, there were rounding errors and an error due to the
resolution (~0.01 Hz). The former was eliminated using higher precision
arithmetic the latter by setting the dds to 16x and dividing the
output enroute to keyer the Decca. It isn't anything fancy or exotic and
perhaps a just bit of good luck.
So it seems the photons are now last reasonably stable, accurate,
monochromatic and exhibit phase coherence. The next steps are to
make them frequency agile (137.555 kHz) and to key them in a manner
that preserves these properties. Perhaps I can code the OP32 directly
in the microprocessor? How long would the minumim message be or would
I be better off using a computer to take care of the keying?
73 to all
Joe VO1NA
On Tue, 18 Jun 2013, Markus Vester wrote:
Hi Joe,
it looks like you've moved your QRG to an exact integer Hz a couple of
nights ago. Just curious how you managed to circumvent the 2^-32 DDS
clock raster - did you just tweak the reference frequency, or employ some
sophisticated fractional-N frequency toggling scheme?
And how about serving some freshly cooked, perfectly coherent Opera-32 to
the world tonight? The famous international reception commitee is
awaiting your signal ;-)
Best 73,
Markus (DF6NM)
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