Look at the WSPR-Pi kit at https://www.tapr.org/kits_20M-wspr-pi.html
On Thu, Jun 14, 2018 at 3:59 PM, David Rowe <da...@rowetel.com> wrote:
> Yesterday Evariste, F5OEO demonstrated FreeDV 800XA and rpitx working
> together:
>
> https://twitter.com/F5OEOEvariste/status/1007192855679504384
>
> rpitx is software for the Raspberry Pi that turns it into a transmitter,
> using clever programming of the PLL and GPIO hardware:
>
> https://github.com/F5OEO/rpitx
>
> I'm interested in moving this work forward. A nice next step would be
> building a HF or UHF FreeDV transmitter with a few watts power output that
> meets ITU Amateur Radio Specs of spurious components being down by 43dB +
> 10log10(P).
>
> Cheers,
>
> David
>
> On 15/06/18 07:20, Alan Beard wrote:
>
>> Hi David,
>>
>> Anytime if you want an ARM platform to run on, ask me
>> for a logon (RDP) to our Men's Shed box. It's a web and file server
>> on our ADSL line. Has plenty of disk, 1Tb.
>> Linux: Fedora 25
>>
>> It's a Banana Pi (original) of course, kills our power bill using
>> about 5W.
>>
>> Electricity is expensive. a 100W PC will cost $300 per year 24x7!!
>>
>> Alan VK2ZIW
>>
>> On Thu, 14 Jun 2018 14:43:35 +0930, David Rowe wrote
>>
>>> Hi,
>>>
>>> Just want to point out that, last time I tested them, the 4FSK
>>> waveforms
>>> (FreeDV 2400A, and 800XA) work just fine - unmodified and without a
>>>
>> scrambler.
>>
>>>
>>> 800XA is being used by people over the air - in fact I'm working
>>> with some UK Hams on exciting high power experiments using simple
>>> and compact Class E amplifiers. There is a lot of link margin
>>> possible compared to OFDM waveforms through linear PAs.
>>>
>>> Now 800XA is a FreeDV GUI mode that anyone can run ..... pls feel
>>> free to try it.
>>>
>>> Two years ago Brady ran 2400A (using a 4FSK modem) on the SM2000
>>> prototypes which use the stm32 - Glen IIRC you were in the Gipstech
>>> audience :-)
>>>
>>> So what we have is:
>>>
>>> i) Code that works on the x86 platform
>>> ii) Code that doesn't on the stm32
>>>
>>> This suggests a porting issue to me. Steve - happy to work with you
>>> on a series of unit tests to take us from x86 FreeDV API cmd line
>>> test programs to working code on the stm32. It is possible there is
>>> some corner case that we are missing, if so some careful unit tests
>>> will show that up.
>>>
>>> Cheers,
>>>
>>> David
>>>
>>> On 14/06/18 13:20, Steve wrote:
>>>
>>>> Yes. You can't see it on the FreeDV spectrum display, as that display is
>>>> filtered and averaging. But I'm sure an oscillator or two disappears.
>>>>
>>>> This particular scrambler resets itself every frame. It has a starting
>>>> bit pattern. So every modem frame starts-off with the same value, and is
>>>> only 64 bits long (two codec frames). So errors may only be 80 ms in
>>>> length, before the next modem frame.
>>>>
>>>> The additive scrambler for HORUS was taken out of wikipedia
>>>>
>>>> 1+x^{{-14}}+x^{{-15}}
>>>>
>>>>
>>>> On Wed, Jun 13, 2018 at 10:37 PM glen english <g...@cortexrf.com.au
>>>> <mailto:g...@cortexrf.com.au>> wrote:
>>>>
>>>>
>>>> The downside of most scramblers (I dont know what is used here) is
>>>>
>>> that
>>
>>> you can get error propagtion in a scrambler.
>>>>
>>>>
>>>>
>>>> ------------------------------------------------------------
>>>> --------------
>>>>
>>> ----
>>
>>> Check out the vibrant tech community on one of the world's most
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>>>>
>>>>
>>>>
>>>> _______________________________________________
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>>>> Freetel-codec2@lists.sourceforge.net
>>>> https://lists.sourceforge.net/lists/listinfo/freetel-codec2
>>>>
>>>>
>>> ------------------------------------------------------------
>>> ----------------
>>>
>> --
>>
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>>
>>
>> Alan
>>
>> Evil flourishes when good men do nothing.
>> Consider the Christmas child.
>> ------------------------------------------------------------
>> ---------------
>> Alan Beard Unix Support Technician from 1984 to today
>> 70 Wedmore Rd. Sun Solaris, AIX, HP/UX, Linux, SCO, MIPS
>> Emu Heights N.S.W. 2750 Routers, terminal servers, printers, terminals
>> etc..
>> +61 2 47353013 (h) Support Programming, shell scripting, "C",
>> assembler
>> 0414 353013 (mobile) After uni, electronics tech
>>
>>
>>
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Open Source Initiative
President, Open Research Institute; Board Member, Fashion Freedom
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