[OZAPRS] [amsat-bb] Signalink Modification for 9600 baud

[Mark Jessop]

There is a difference between 'works' and 'works optimally'.
Using a Signalink is quite likely to work with a good SNR, however there is
likely going to be a performance hit due to the 3khz passband width.

Actually quantifying the performance hit isn't something you can easily do
from a satellite pass - bench testing with known-SNR signals is a better
approach.
Then there's the question of modem performance, and anything trying to
decode FSK via a FM demod ('slicing') is going to have some degree of
performance hit compared to an ideal FSK demodulator.

73
Mark VK5QI

On Oct 12, 2017 14:33, "Andrew Rich" <vk4tec at tech-software.net> wrote:

> Because someone asked if it worked or not
>
> The tech at the company said no
>
> Hams are receiving
>
> I am trying myself and reporting back
>
> $100 vs $500 for a tnc
>
> Sent from my iPhone
>
> On 12 Oct 2017, at 1:55 pm, Matthew Cook <vk5zm at bistre.net> wrote:
>
> .... why !
>
> 73
>
> /M.
>
> On 12 October 2017 at 14:17, Andrew Rich <vk4tec at tech-software.net> wrote:
>
>> My icom910h is setup on 9k6 as is the signalink USB
>>
>> I moved the jumper in the signs link
>>
>> I turned on 9k6 in the radio
>>
>> UZ7HO sound modem software decoding 1k2 perfectly
>>
>> Falconsat is one hour away
>>
>> If I still had a 9k6 ht I would test it now
>>
>> Andrew
>>
>> Sent from my iPhone
>>
>> On 12 Oct 2017, at 1:43 pm, Matthew Cook <vk5zm at bistre.net> wrote:
>>
>> I'd suggest you "go the gemba".
>>
>> Here's a list of URL's to bring you up to speed on the questions you
>> should be asking.c
>>
>> http://www.ti.com/product/PCM2900
>> https://en.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_sampling_theorem
>> https://docs.microsoft.com/en-us/windows-hardware/drivers/au
>> dio/intel-s-hd-audio-architecture
>>
>> From there it should be easy for you to solve and put this issue to rest.
>> Unless you can explain why your "test" works you didn't answer the question.
>>
>> 73
>>
>> Matthew
>> VK5ZM
>>
>> On 12 October 2017 at 12:01, Andrew Rich <vk4tec at tech-software.net>
>> wrote:
>>
>>> Ok here is the go
>>>
>>> Rick - confirms it works with a bird 9600
>>> Tigertronics website talks about using the 9600 data port on your radio
>>> The jumper page talks about an icom 910h such as mine, being careful to
>>> select the 9600 baud unfiltered not the 1200 baud port for such modes
>>> The bandwidth of pass band is the same as a normal sound card
>>> You just have to avoid emphasis and de emphasis
>>>
>>>
>>> So, anyone with a kenwood d710 or d7 ht please do a bench test to rest
>>> this issue
>>>
>>> 9600 baud
>>>
>>> Report back
>>>
>>> I find it odd what the tech said sounds like a guess to me
>>>
>>> Andrew
>>>
>>> Sent from my iPhone
>>>
>>> > On 12 Oct 2017, at 10:44 am, Rick Kowalewski <rick at vk6xlr.net> wrote:
>>> >
>>> > Well that's interesting.
>>> >
>>> > I've used a USB Signalink with an Icom IC-9100 and hs-soundmodem to
>>> successfully decode 9600 from Falconsat-3.
>>> > To my knowledge, the Signalink has not been modified.
>>> >
>>> > 73,
>>> > Rick VK6RK
>>> >
>>> >> On 12/10/2017 05:55, christy hunter wrote:
>>> >> based on discussion with a technician at Tigertronics, the USB
>>> signalink will not allow 9600 baud packet due to the frequency response is
>>> too narrow. He said none of the commercial external soundcards will work
>>> with 9600 bd packet. The only option is to construct a circuit, or use a
>>> 9600 baud TNC. (not too many options on that front.)
>>> >>
>>> >> the Tigertronics website is a bit miss-leading because it ref. 9600
>>> baud on its wiring diagram. Mine is setup for the 6pin miniDin
>>> connector(the pin 4 - for 9600 bd on my radio dataport- is not connected)
>>> for my FT 847.  At this time I can only decode by connecting the 9600 pin
>>> on my radio (dataport) to a line-in to my Laptop soundcard (and not using a
>>> isolation circuit).
>>> >>
>>> >> It would be nice to hear of any solution to this, without buying a
>>> $400 TNC (kantronics 9612).
>>> >>
>>> >> there are several websites that talk to this issue, here is one of
>>> them
>>> >>
>>> >> https://www.soundcardpacket.org/5modes.aspx
>>> >>
>>> >> 73
>>> >> Christy KB6LTY
>>> >
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