[Xastir] Noisy conditions

[Philip]

Hi all,

My 2 cents worth.

Some time ago, I found this very useful web site for anyone using packet 
protocol.

http://www.febo.com/packet/layer-one/transmit.html

In my case, I found the information invaluable.

Regards

Philip
VK4HPW

On 26/06/15 07:55, vk2tv wrote:
> If I can weigh in with some observation about the sample packets?
>
> I downloaded the file and loaded it into Audacity. When listened to, 
> the first packet is noticeably noisier (crackly hiss) than the second 
> packet (quite clean) and, when viewed in spectral view, the extra 
> noise on packet one is visibly noticeable as increased high frequency 
> and other noise. The second packet is much cleaner in spectral view, 
> and audibly.
>
> I hope that helps.
>
> Ray vk2tv
>
> On 26/06/15 03:49, Skyler F wrote:
>>> Soundmodem does work but there are several alternative options out 
>>> there
>>> now and almost all of them are superior.
>>
>> Other than extra features on other sound modem software packages, are 
>> there
>> actual disadvantages on decoding packets where soundmodem does not 
>> work as
>> well?
>>
>> I would say those two packets sound fairly decent but they don't 
>> sound like
>>> 100% standard packets.  Do you know what's sending them?
>>
>> PocketPacket on iPhone with a baofeng radio was sent through no 
>> antenna to
>> simulate a weaker signal. The only reason I started testing this 
>> stuff was
>> because I noticed I was not decoding a large amount of packets I was
>> hearing, and they didn't seem to have a huge amount of noise on them.
>>
>>
>> Skyler KDØWHB
>>
>> On Wed, Jun 24, 2015 at 10:32 PM, David Ranch <xastir at trinnet.net> 
>> wrote:
>>
>>> Hello Skyler,
>>>
>>>   I set up a USB sound card with soundmodem (I could not figure out
>>>> direwolf) and started decoding packets
>>>>
>>> Strange that you were able to get Soundmodem working but not Direwolf.
>>> It's usually the other way around!  Happy to give you a hand if you 
>>> want.
>>>
>>>
>>>   I was told that packets can be decoded in noisier environments then
>>>> standard FM voice, but that isn't showing to be true.
>>>>
>>> Yeah.. not true.  Soundmodem does work but there are several 
>>> alternative
>>> options out there now and almost all of them are superior. Here is a 
>>> list
>>> I put together some time ago:
>>>
>>>
>>> http://www.trinityos.com/HAM/CentosDigitalModes/hampacketizing-centos.html#6.softtnc 
>>>
>>>
>>>
>>>   Here is a MP3 file of two packets. The first one was not decoded 
>>> and the
>>>> second one was decoded by sound modem. They both seem pretty clear 
>>>> noise
>>>> wise however, and I want my station to decode as well as possible 
>>>> when it
>>>> is put into use.
>>>>
>>>> I am using speaker audio from an alinco dr-600.
>>>>
>>>> http://amsatnet.info/recordings/APRS.mp3
>>>>
>>> I would say those two packets sound fairly decent but they don't sound
>>> like 100% standard packets.  Do you know what's sending them?
>>>
>>> --David
>>> KI6ZHD
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>>>
>>
>>
>
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