Hi Eddy,
Where did you get the description of the OPERA protocol? And did you write
the encoding yourself?
I found a protocol description of Opera on Andy’s (G4JNT) website, but it is
reverse-engineered, and I seem to remember him complaining about
undocumented (and unannounced) protocol changes.. So I am not sure how up to
date his description is.
I understand that Opera is quite efficient, so I am still somewhat
interested… but not in just simply generating Opera timings with an
obfuscated and secret external program and then parsing this through my
PIC/AD9850 TX. Where is the fun in that?
As for a final build.. there is no such thing here @pa3bca… As soon as it’s
finished (i.e. I cannot think of additional things or software to add) it
will probably start gathering dust somewhere. Or (more likely) I will attach
a key(er) and use it for CW. Beaconing for beaconing’s sake is not for me.
73’s and please keep us posted on results.
Minto pa3bca
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Ceterum censeo Carthaginem delendam esse
-----Original Message-----
From: g3zjo
Sent: Sunday, February 10, 2013 00:02
To: [email protected]
Subject: Re: LF: Re: WSPR Test
Hi Minto
Nice one.
There is a 4066 on my Modulator / Mixer board too, unused here, I can
reconfigure and plug in the Key. I am not sure of any ultimate
configurations for a final build, it is still at the experimental stage.
I have a CW / OPERA QRSS Module too, I have coded and tested OPERA it
is OK but I can't get to love it.
73 Eddie G3ZJO
On 09/02/2013 22:22, Minto Witteveen wrote:
I too have built a standalone 472 100 Watt TX with a PIC (and an AD9850).
The software I have written so far now handles CW, QRSS, DFCW and WSPR-2
and WSPR-15 (thanks to Andy who wrote up a nice description of the WSPR
protocol).
Even with a simple ‘air cooled’ 10 MHz crystal (40 MHz with 4x PLL)
running the PIC timekeeping is quite good, and it seems good enough to
have the PIC running for more than a day and still getting WSPR decodes.
If I run it from a 12.8 TXCO it will be even better.
I now sync the TX (for WSPR) by getting the PIC out of reset exactly on an
even minute….
I am not sure if I am going to implement Opera. There is too much
obscurity here for my liking. Apart from the difficulty of getting a good
and complete description of the protocol it’s the secrecy itself that has
no place in radio amateurism (at least that is how I think about the
issue).
As for being a despicable appliance operator: notice the 4066? Here I can
attach a key..
The PIC board will disappear. Possibly I will add a PIC to the DDS board
(will have to reposition the 7805 for it to fit). Either that or I will
add a small board with the PIC and connectors for the LCD display, the
RS232 for a terminal and possibly a rotary encoder.
Add a 24V 150 Watt Meanwell switching PSU and it’s a neat little
self-contained package.
See attachments for a photo of the current setup and a quicly drawn
schematic
73's Minto pa3bca
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Ceterum censeo Carthaginem delendam esse
-----Original Message----- From: g3zjo
Sent: Saturday, February 09, 2013 20:43
To: [email protected]
Subject: Re: LF: Fwd: WSPR Test
Yes I know it is always nice to see home brew, even from despicable
appliance operators.:-)
Some recycling of some of my 500KHz rock bound modules.
Eddie
On 09/02/2013 19:22, Stefan Schäfer wrote:
Am 09.02.2013 19:58, schrieb g3zjo:
No time reference just very accurate PIC timing which is good for weeks.
Ah yes. BTW when using e.g. a netbook in /p WSPR tests it is totally
sufficient to sync the PC clock manually to your wrist watch (which
was synced at home), if necessary. So it is not really a pro-argument
for Opera that no timing is required. I've recently tested that at
home with my own transmissions...
PA, yes tiny by your standards, but it is the PA that has been
growing recently.
:-)
Pictures please!
Oh dear do you really like rats nests?
...and dirty fingers, yes ;-)
73, Stefan
Eddie
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