Message-ID: <D0D204B7880144B1BC4892133337ACB8@PcMinto>
From: Minto Witteveen <minto.witteveen@gmail.com>
To: <rsgb_lf_group@blacksheep.org>
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Date: Sun, 10 Feb 2013 00:37:02 +0100
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Subject: LF: Re: WSPR Test
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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: rsgb_lf_group@blacksheep.org
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
>
>
>
>
> -------------------------------------------------------------------------- 
>
> Ceterum censeo Carthaginem delendam esse
> -----Original Message----- From: g3zjo
> Sent: Saturday, February 09, 2013 20:43
> To: rsgb_lf_group@blacksheep.org
> 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
>>
>>