[aprssig] 1200 vs 9600 baud

Ray Wells vk2tv at exemail.com.au
Sat Dec 21 14:09:42 CST 2013


It's too early to find what I'm looking for but somewhere in the docs  
on using DTV dongles for adsb there's mention of the bandwidth which I 
thought was stated to be about 2MHz - but don't hold me to that.

Dongles with the R820 rx chip already cover the 23cm band, where (in 
Australia at least) wideband signals using any modulation technique are 
permitted, so there's the experimental rx. Now for someone smarter than 
me to come up with an experimental tx.

Ray

vk2tv

On 21/12/13 21:51, Andrew Rich wrote:
> Most definitely
>
> Someone should try making adsb for ham radio
>
> The only thing is the bandwidth
>
> ADSB is just pulse position modulation.
>
> Except its at 1MB /s
>
> I think it's about 7 MHz
>
> Could be ok on 1200 MHz ?
>
> It is awesome to hear a 'click' like static that translates to a 
> position report
>
> Andrew
>
> Sent from my iPhone
>
> On 21/12/2013, at 1:33 PM, Ray Wells <vk2tv at exemail.com.au 
> <mailto:vk2tv at exemail.com.au>> wrote:
>
>> Andrew,
>>
>> Are there any components of ADS-B that might be transferable to a 
>> totally "new", UHF APRS system. We recognised years ago that ax25 has 
>> severe limitations and that better systems exist. Whilst we'll never 
>> change ax25 and 1k2 aprs it should be possible to devise an 
>> alternative network using new protocols to which users can migrate 
>> over a period of time.
>>
>> My $0.02 worth
>>
>> Ray
>> vk2tv
>>
>>
>> On 21/12/13 14:24, Andrew Rich wrote:
>>> Been thinking about this for a while
>>> I thought 9k6 was less reliable.
>>> Wouldnt you be better off going like FL-DIGI ?
>>> Fast RTTY
>>> - Andrew -
>>>
>>>     ----- Original Message -----
>>>     *From:* Hüseyin ODABAS,, TA1DF <mailto:ta1df.huseyin at gmail.com>
>>>     *To:* TAPR APRS Mailing List <mailto:aprssig at tapr.org>
>>>     *Sent:* Friday, December 20, 2013 6:08 PM
>>>     *Subject:* Re: [aprssig] 1200 vs 9600 baud (was: Tracker3 9600
>>>     baud balloon tracker beta offer)
>>>
>>
>> _______________________________________________
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>> aprssig at tapr.org <mailto:aprssig at tapr.org>
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>
>
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