[Xastir] Noisy conditions

[vk2tv]

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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>>
>
>