[aprssig] 6 meter APRS

[Chris Moulding]

Hi,

One project I'm working on in whatever spare time I have is a PSK-125 
TNC add-on for UI-View.

To test this I've already written a macro in Fldigi to simulate an APRS 
message.

I've just spent a few minutes running the message through various digi 
modes and CW speeds to
measure the time taken. See the results below:

The test message is:

G4HYG>APRS,GATE,WIDE2-2:=5332.76N/00225.91W&Chris, testing PSK modes for 
APRS

Time taken to send the message:

PSK-31................23.66 s

PSK-63................12.30 s

PSK-125................6.91 s

PSK-250................3.87 s

RTTY (45 bd)......18.50 s   (note that > is not in the character set)

OLIVIA (8-250)....59.48 s

CW (18 wpm).......64.43 s

CW (50 wpm).......23.61 s

CW (100 wpm).....11.66 s

Please note that the times were recorded on a handheld stopwatch so it's 
not as
accurate as the two decimal places indicate!

It's worth noting that Fldigi has a PSK browser showing up to 20 
different contacts.
I've not tried it on the air on CW (yet).

73s,

Chris, G4HYG


Chris Moulding
Cross Country Wireless (2009) Ltd
7 Thirlmere Grove, Bolton, Lancs, BL4 0QB, UK
Tel/fax: +44(0)1204 410626
Mobile:  +44(0)7752 391908
Website: http://www.crosscountrywireless.net
Company number 6780346 registered in England and Wales  



Earl Needham wrote:
> I was actually thinking of CW at 100 WPM or more, and yes, CW Skimmer seems to have the tuning problem licked. 
>
> 7 3
> Earl
> ------Original Message------
> From: Curt, WE7U
> To: My Plateau Email Earl Needham
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] 6 meter APRS
> Sent: Aug 26, 2009 10:15
>
> On Wed, 26 Aug 2009, Earl Needham wrote:
>
>   
>> However, I'm daydreaming of putting it on CW -- that would be
>> legal on ANY amateur frequency (except 60 meters). At some point
>> this could be a real advantage. I no longer program but I bet it
>> would be straightforward to write software for CW instead of
>> AX.25.
>>     
>
> Yes, straightforward.  You don't even need audio out, just PTT and
> GND (to the keyer input).
>
> The more difficult part is needing stable rigs on both ends in order
> to have automated software copy you (unless you're using something
> like CW Skimmer I suppose).  CW signals are quite narrow.
>
> You'd also need software to convert the received CW back into an
> APRS type of posit, perhaps injecting it into the APRS-IS.
>
> So...  How long in ms would it take to send a CW posit at 30 or
> 40wpm in Base-91 format?  50wpm?
>
>   
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