Message-ID: <2AA174FAFE094E80BDC7675E3D03EC28@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
Cc: "Eddie" <g3zjo@talktalk.net>
References: <CCD77332007C4CF2A69A6556ADF801D7@White> <Pine.LNX.4.64.1306191557130.22258@plato.ucs.mun.ca>
In-Reply-To: <Pine.LNX.4.64.1306191557130.22258@plato.ucs.mun.ca>
Date: Wed, 19 Jun 2013 21:48:31 +0100
MIME-Version: 1.0
Importance: Normal
Subject: Re: LF: VO1NA 137777.0000
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=response
Content-Transfer-Encoding: 7bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


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: <jcraig@mun.ca>
Sent: Wednesday, June 19, 2013 7:57 PM
To: <rsgb_lf_group@blacksheep.org>
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)
>
> This electronic communication is governed by the terms and conditions at
> http://www.mun.ca/cc/policies/electronic_communications_disclaimer_2012.php
>