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

Andrew Rich vk4tec at tech-software.net
Thu Oct 12 15:25:00 AEDT 2017


I can confirm that the Signal link wired up as 9k6 transmits 1k2 fine 

I just tested it 

Andrew 


> On 12 Oct 2017, at 12:37 pm, christy hunter <cchunter3 at mindspring.com> wrote:
> 
> thanks Andrew,
> will be interested to hear how it works.
> I can decode ok, but not thru the signalink. but it seems to not be practical anyway having to move the internal wire connector to use 9600.
> 73
> christy kb6lty
> 
> On 10/11/2017 19:18, Andrew Rich wrote:
>> Twitter is flooded with Falconsat Reception reports as is my website
>> 
>> I watched Falconsat on SDR - It has a fair amount of doppler
>> 
>> I have a fully automated ICOM 910H with doppler correction sitting here hooked up to my Signalink having moved the internal jumper to 9k6
>> 
>> I await the bird
>> 
>> Andrew VK4TEC
>> 
>> 
>> 
>>> On 12 Oct 2017, at 11:46 am, David W0DHB <dave at w0dhb.net> wrote:
>>> 
>>> Just looking at specs.
>>> 
>>> 9.6 Khz baud packet needs (per G3RUH spec)
>>> •Response to DC
>>> •Response no worse than -4 db at 4.8 kHz
>>> •No worse than -10 db at 7.2 kHz
>>> 
>>> The Tigertronics spec's say audio response 300 Hz to 3.3KHz  -  ouch
>>> Depending on how quickly the audio response curve rolls off the Signallink is kind of iffy for 9.6K .
>>> Some folks have gotten it to work.
>>> 
>>> This outfit has an isolation transformer spec'ed 20 to 20KHz.
>>> A little pricey, but it is stereo so TX and RX audio are covered with a single unit
>>> 
>>> http://www.fullcompass.com/prod/097486-Radio-Design-Labs-AVHK1
>>> 
>>> For just RX, a dongle, HDSDR and hs_soundmodem do a great job .
>>> 
>>> Dave W0DHB
>>> 
>>> 
>>> -----Original Message-----
>>> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of christy hunter
>>> Sent: Wednesday, October 11, 2017 15:55
>>> To: amsat-bb at amsat.org
>>> Subject: [amsat-bb] Signalink Modification for 9600 baud
>>> 
>>> 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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>>> _______________________________________________
>>> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
>>> to all interested persons worldwide without requiring membership. Opinions expressed
>>> are solely those of the author, and do not reflect the official views of AMSAT-NA.
>>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>> 
> 



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