[OZAPRS] PSK63 for APRS on HF

[Mark Jessop]

Going from experience, and a lot of simulation and on-air testing, I'd 
say MFSK16 will be a far more reliable system than PSK63, mainly due to 
it's r=1/2 forward error correction. You probably wouldn't need much 
more than 5W for australia-wide coverage.

It's also fairly easy to generate (with a DDS anyway), and is constant 
amplitude (no linear amp required!), so you could make a 5W MFSK beacon 
using a Class E PA running at >95% efficiency.

The main downside is it is slow, so channel congestion becomes more of 
an issue.

Cheers,
Mark


On 8/04/14 11:54 AM, Gerard Hill wrote:
> About 4 years ago a bunch of us started experimenting with PSK 
> <http://wa8lmf.net/APRS_PSK63> for APRS on HF. We used the APRS 
> Messenger <http://www.crosscountrywireless.net/aprs_messenger.htm> 
> software which supported a variety of speeds from 31 to 250 bps. It 
> proved far superior to FSK300 packet. I ended up running an IGate on 
> 7034.7 kHz and a receive-only IGate on 10149.7 kHz. These PSK ports 
> closed 2 years ago.
>
> APRS Messenger requires a PC running Windows and continues to be 
> developed so now supports GMSK250 
> <http://www.radio-electronics.com/info/rf-technology-design/pm-phase-modulation/what-is-gmsk-gaussian-minimum-shift-keying-tutorial.php> 
> and MFSK16 modes as well as PSK63 and PSK250. APRS messages contain a 
> checksum allowing posits to be verified before injection into the 
> APRS-IS. It is great software for the shack, not so convenient in the 
> mobile where a compact tracker is needed.
>
> Last year, the FreeTrak63 
> <http://www.ringolake.com/pic_proj/FT63/ft63_page.html> was developed 
> for mobile use. It can generate PSK63 and MFSK16. Blank PCBs are 
> available.
>
> Anyone interested in trying PSK63 for APRS?
> I'm running it on 10149.7 at the moment using VK2IO-63.
>
> Cheers,
> Gerard - VK2IO
>
> On 4/04/2014 8:00 AM, Andrew Rich wrote:
>> Psk had very good noise performance
>>
>> Psk63 is faster than psk31
>>
>> No error check tho
>>
>> Sent from my iPhone
>>
>>> On 4 Apr 2014, at 6:58 am, Matt VK2RQ<matt.vk2rq at gmail.com>  wrote:
>>>
>>> This is an interesting article on that topic:
>>> http://wa8lmf.net/APRS_PSK63/
>>>
>>> 73,
>>> Matt VK2RQ
>>>
>>>> On 4 Apr 2014, at 7:37 am, Shaun<vk2xpp at optusnet.com.au>  wrote:
>>>>
>>>> What is the advantage of psk63?
>>>>
>>>> Brief reply only from my iPhone
>>>>
>>>>> On 3 Apr 2014, at 17:56, Andrew Rich<vk4tec at tech-software.net>  wrote:
>>>>>
>>>>> Just got a icom 7000 and scs packet modem will see if it does psk63
>>>>>
>>>>> Sent from my iPhone
>>>>>
>>>>>> On 3 Apr 2014, at 2:49 pm, Andy Nguyen<an at comms.net.au>  wrote:
>>>>>>
>>>>>> Thanks Mark,
>>>>>> Just checking :)
>>>>>> Regards
>>>>>> Andy VK3YT
>>>>>>
>>>>>>> On 3 Apr 2014, at 3:35 pm, Mark Jessop<lenniethelemming at gmail.com>  wrote:
>>>>>>>
>>>>>>> Planning on a HF balloon payload there Andy?
>>>>>>>
>>>>>>> And AFAIK there's no PSK capable iGates in Australia.
>>>>>>>
>>>>>>> - Mark VK5QI
>>>>>>>
>>>>>>>> On 3/04/14 3:04 PM, Andy Nguyen wrote:
>>>>>>>> Hi all,
>>>>>>>> Do we have any iGate on HF (30m) in Australia that supports PSK63 ?
>>>>>>>> Regards
>>>>>>>> Andy
>>>>>>>>
>
>
>
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