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

[Matthew Cook]

.... 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/
> audio/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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