[aprssig] 1200 vs 9600 baud

Andrew Rich vk4tec at tech-software.net
Sat Dec 21 16:47:59 CST 2013


I know some one who made a tx 

Sent from my iPhone

On 22/12/2013, at 6:09 AM, Ray Wells <vk2tv at exemail.com.au> wrote:

> 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> 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 ODABAŞ, TA1DF
>>>> To: TAPR APRS Mailing List
>>>> 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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>> 
>> 
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