Regarding Observation 288806 …
I thought I’d run a little test to see how good the various methods I have for decoding APRS frames are (just using the audio). Nothing technical, just a play about with some of the things I have lying about.In this observation…
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There is one frame (I guess) recorded in the observation itself
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My ArgentData Arduino radio shield (https://www.argentdata.com/catalog/product_info.php?products_id=136&osCsid=NSi4GqBtkQDsYOQRXUM-Y1) managed a big fat zero
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APRSdroid also managed nothing
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Some piece of software I found called QTmm AFSK1200 decoder (https://sourceforge.net/projects/qtmm/) by some bloke called @csete managed tons - section below
19:13:56$ fm S51BJ-0 to APZWPP-0 via RS0ISS-0 UI^ PID=F0 =4633.82N/01608.22Eyop.JOZE *** WWW.S51BJ.EU *** 73 ! 19:14:02$ fm G7HCE-0 to CQ-0 via RS0ISS-0 UI^ PID=F0 :S51BJ :Hi from IO80 in Exeter - QSL ! 19:14:11$ fm G0RNU-0 to CQ-0 via RS0ISS-0 UI^ PID=F0 Greetings Via the ISS From The Port of Tilbury UK 19:14:20$ fm G7HCE-0 to CQ-0 via RS0ISS-0 UI^ PID=F0 :G4DCQ-7 :Hi from IO80 in Exeter - QSL ! 19:14:24$ fm HB3YGP-0 to TWRTRL-0 via RS0ISS-0,RS0ISS-0 UIv PID=F0 `0ll .-/`_% 19:14:24$ fm G0RNU-0 to CQ-0 via RS0ISS-0 UI^ PID=F0 =5128.45N/00022.30E`- JO01el Port of Tilbury UK {UISS54} 19:14:33$ fm EA4GII-9 to SX5SSV-0 via RS0ISS-0,PCSAT-0,WIDE2-1 UIv PID=F0 '|V~l .K\]ea4gii@ure.es 19:14:38$ fm G7HCE-0 to CQ-0 via RS0ISS-0 UI^ PID=F0 CQ CQ G7HCE in IO80gr via ISS - QSL.! 19:14:41$ fm HB3YGP-0 to TWRTRL-0 via RS0ISS-0,RS0ISS-0 UIv PID=F0 `0ll .-/`_% 19:14:44$ fm S51BJ-0 to APZWPP-0 via RS0ISS-0 UIv PID=F0 =4633.82N/01608.22Eyop.JOZE *** WWW.S51BJ.EU *** 73 ! 19:14:44$ fm RS0ISS-0 to CQ-0 UIv PID=F0 >ARISS - International Space Station 19:14:55$ fm HB3YGP-0 to TWRTRL-0 via RS0ISS-0,RS0ISS-0 UIv PID=F0 `0ll .-/`BEST 73 VIA ISS TO HB9DC DIGIAL RADIO CLUB ZH VISIT HB3YGP_% 19:15:09$ fm HB3YGP-0 to TWRTRL-0 via RS0ISS-0,RS0ISS-0 UIv PID=F0 `0ll .-/`BEST 73 VIA ISS TO HB9DC DIGIAL RADIO CLUB ZH VISIT HB3YGP_% 19:15:11$ fm PSAT-0 to APRSON-0 via ARISS-0 UI PID=F0 T#085,839,069,655,789,402,00011000 19:15:14$ fm S51BJ-0 to APZWPP-0 via RS0ISS-0 UIv PID=F0 =4633.82N/01608.22Eyop.JOZE *** WWW.S51BJ.EU *** 73 ! 19:15:18$ fm IK1COA-2 to T4RQU6-0 via RS0ISS-0 UIv PID=F0 ')Gl .-/]= 19:15:20$ fm G0RNU-0 to CQ-0 via RS0ISS-0 UI^ PID=F0 =5128.45N/00022.30E`- JO01el Port of Tilbury UK {UISS54} 19:15:22$ fm IR0UGN-1 to CQ-0 via RS0ISS-0 UI PID=F0 =/90C,Qc3x` BJN62JE IZ0QWM http://www.kwos.it 19:15:28$ fm G0RNU-0 to CQ-0 via RS0ISS-0 UI^ PID=F0 :RS0ISS :hello greetings 73s 19:15:35$ fm HB3YGP-0 to TWRTRL-0 via RS0ISS-0,RS0ISS-0 UIv PID=F0 `0ll .-/`_% 19:15:36$ fm IR0UGN-1 to CQ-0 via RS0ISS-0 UI PID=F0 Hi to all via ISS - IZ0QWM 19:15:40$ fm G4DCQ-2 to CQ-0 via RS0ISS-0 UI PID=F0 :G0RNU : Hello QSL your Signals in JO02QV Distance is 173 klm 19:15:41$ fm HB3YGP-0 to TWRTRL-0 via RS0ISS-0,RS0ISS-0 UIv PID=F0 `0ll .-/`BEST 73 VIA ISS TO HB9DC DIGIAL RADIO CLUB ZH VISIT HB3YGP_% 19:15:43$ fm G0RNU-0 to CQ-0 via RS0ISS-0 UI^ PID=F0 :G7UZN :hello greetings 73s 19:15:45$ fm OE6PWE-0 to APZWPP-0 via RS0ISS-0 UI PID=F0 =4659.08N/01527.57E-73's Via ISS, wolfgang.puhar@chello.at 19:15:47$ fm G4DCQ-2 to CQ-0 via RS0ISS-0 UI PID=F0 :G0RNU : Hello QSL your Signals in JO02QV Distance is 173 klm 19:15:51$ fm S51BJ-0 to APZWPP-0 via RS0ISS-0 UIv PID=F0 =4633.82N/01608.22Eyop.JOZE *** WWW.S51BJ.EU *** 73 !
So what does this tell us?
Firstly - The audio quality is good enough to be decoded
Secondly - Both the argent data shield and APRSdroid can be a bit funny about the qulaity of the inputed audio.
Lastly - Not much really, just an observation on an observation.
Just to add in the fact that both the Argent data shield and APRSdroid do decode on a relatively hiss free TNC test CD
