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Re: LF: Raspberry Pi sound interface that works

To: [email protected]
Subject: Re: LF: Raspberry Pi sound interface that works
From: DK7FC <[email protected]>
Date: Thu, 16 Feb 2017 11:41:23 +0100
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...they are available again, https://www.amazon.co.uk/gp/product/B01HBC8CJ0/ however that's in UK, i didn't find them in amazon.de so far. However i'm waiting for the device with 6 inputs anyway :-)

73, Stefan

PS: Jim, i don't think the module will have problems with the RPi3, it's just a question of power consumption for a portable or solar supplied system. My tree grabber is running on a RPi2B, i need to take care saving each mA, otherwise the availability will decrease, especially in December! An on-board WLAN may be comfortable for your application, crossing a distance of up to 10m. But for my tree, i need a WLAN stick with an SMA jack to connect a yagi. The distance is 3.5 km...

Am 16.02.2017 00:45, schrieb [email protected]:
Paul,

Thanks for posting your findings on this topic.

Plenty of the Audio Injector boards on local Amazon so I bought four in hopes 
that your tests would prove favorable. Thanks for the favorable results!

I haven’t worked with a Raspberry Pi before but have a new CanaKit RPi 3 and 
though I would use it with the Audio Injector module. Then I saw your message 
indicating disinclination toward RPi 3 power dissipation (from unused built-in 
Bluetooth and WiFi). I had guessed that the RPi would be used to enable a wireless 
connection between antenna and laptop/PC, which raises a question (if you have a 
moment): for a backyard-antenna-to-indoor-laptop application or for a portable 
field-test application, what type of interface would be used between an outdoor RPi 2 
and an indoor laptop or portable-field-test laptop?  (or am I on the wrong track; 
should I be thinking of Audio Injector plus  RPi 2as an unattended datalogger rather 
than a real-time interface between VLF loop and laptop?)

Thanks,

Jim AA5BW





-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of Paul Nicholson
Sent: Wednesday, February 15, 2017 5:02 PM
To: [email protected]
Subject: Re: LF: Raspberry Pi sound interface that works


Another update to EbSynth, now at version 0.7a

   http://abelian.org/ebnaut/ebsynth.shtml

Now compensates properly for changing delay of the output buffer as the sample 
rate wanders.  A temperature change that previously produced a 30 degree output 
change now only affects the phase by about 0.3 degrees. The residual is a 2nd 
order effect proportional to the rate of change of sample rate.

I've noticed a couple of sound card input overruns on the RPi when the CPUs are 
very busy.  0.7a assigns itself a real-time scheduling policy at high priority. 
 It remains to be seen if that fixes the overruns.

--
Paul Nicholson
--



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