[OZAPRS] (no subject)

[Matthew Cook]

One thing to note is that the WA8LMF test CD has a number of pre-defined
"challenges" for your packet decoder to deal with.   There are packets
there that are pre-emphasised, have flat flat-audio, tone offsets, tone
skew and other nasty things.  It is designed to torture your decoder to
death and give it a hard time.

Each of these nasty tests has the opportunity to corrupt a packet and if
your decoder cant cope you should technically get nothing from your TNC.
Playing this back to a known good decoder and then comparing the decode
success rate gives you a good empirical comparison between decoders.  The
higher the number of packets recovered the better.  I've only seen one DSP
modem so far outscore the ubiquitous TCM3105 and MX614 derivatives.

Recording off air is a good first step, however decoding the most number of
those packets on the WA8LMF test CD is the ultimate test.

73

Matthew
VK5ZM

On 9 June 2016 at 08:57, Andrew Rich <vk4tec at tech-software.net> wrote:

> Yep I think I might do that
>
> I have a packet launcher that goes off every 30 seconds
>
> I can record that
>
> -----------------------------
> Sent from my iPhone
> Andrew Rich
> vk4tec at tech-software.net
> www.tech-software.net
> 0419 738 223
>
> On 9 Jun 2016, at 09:02, Marcus B <mrmabs at gmail.com> wrote:
>
> Or you could hook a HT on 145.175 up to computer and record the audio for
> a few hours; should only need 8kHz sample rate to save space, or anything
> above that. You will be limited by the number of types of packets though.
> VK5 has a BBS in NE Adelaide, active on, I think, 147.575, but I'm just out
> of range to record it.
>
> On Wed, 8 Jun 2016, 23:27 Michael Wain <vk3hau at bigpond.net.au> wrote:
>
>> Thats a huge file, 20 minutes to download 😮
>>
>> Yours sincerely
>>
>> Michael Wain - VK3HAU
>>
>>
>> On 8 Jun 2016, at 22:52, Ross Delaforce <ross at livewire.com.au> wrote:
>>
>> Andrew
>>
>> http://wa8lmf.net/TNCtest/getfile.htm
>>
>> Regards,
>>
>> Rossco
>>
>> Ross Delaforce -- ross at livewire.com.au
>>
>>
>>
>> * From: * Andrew Rich <vk4tec at tech-software.net>
>> * To: * <aprssig at tapr.org>, <ozaprs at aprs.net.au>
>> * Sent: * 08/06/2016 10:29 PM
>> * Subject: * [OZAPRS] (no subject)
>>
>> Packet recording
>>
>> Does anyone have a packet radio recording in wav format that can be
>> played back to a decoder for testing ?
>>
>> Andrew
>>
>> -----------------------------
>> Sent from my iPhone
>> Andrew Rich
>> vk4tec at tech-software.net
>> www.tech-software.net
>> 0419 738 223
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