I had no problem replicating the Fox in a Box. My 3B+ runs around 70% CPU when decoding white noise. I am having trouble receiving the satellites because of the Spike in the center of the passband as well as images to the side. Is there anyway to compensate for the offset voltage in LINUX that will run on the P! 3B+? Programs like HDSDR allow you to do the correction within the program but I cannot find where to do it in Fox Telem. There is a Funcube control program for Windows but I have not found one for the PI. According to the Fauncube site, alignment is required every time you loose power to the PI.
Also, I presume that the internet interface for the leader board is not supported? When I click on leaderboard, I get a message that it is not supported but when I acknowledge the pop up, the web brouser launches. It does not seem to have this problem when sending or receiving data to the server. Is this normal.
I you would like to call me, my number is 847-514-8566. Thank you for all of the work you put into the Fox in a Box. If I can fix the DC offset problems, I plan to deploy one to Denver, CO and another to McAllen TX.
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Doug,
We'll have to wait for Chris to answer the question about compensating for the I/Q offset (which is what gives the peak in the middle). I have not had that trouble at all, so I assumed he did it automatically like SDR# does. I use (and the FIAB should have the same offset if you downloaded the image) 145930 as the center frequency. That makes all the Foxes appear on one side or the other. I have found birdies in the spectrum, which I think comes from ethernet switches around my house. Some are pretty close to Fox frequencies. To work around that, I go to the Spacecraft menu and chose the particular s/c that is too close to the noise and adjust the lower and upper search bounds a bit to exclude the noise. I think at worst I made high maybe 3 or 4KHz above the center, and I had no trouble at AOS.
I assume that you do have "track" enable so that it is only looking within those bounds for a signal?
BTW, do you have a FunCube Dongle Pro Plus (it has a + in the center of the O in the logo)? Chris has not had a FCD Pro (not plus) to fiddle with so it may have a worse problem.
On Tue, Dec 11, 2018 at 4:08 PM Doug Phelps via AMSAT-BB amsat-bb@amsat.org wrote:
I had no problem replicating the Fox in a Box. My 3B+ runs around 70% CPU when decoding white noise. I am having trouble receiving the satellites because of the Spike in the center of the passband as well as images to the side. Is there anyway to compensate for the offset voltage in LINUX that will run on the P! 3B+? Programs like HDSDR allow you to do the correction within the program but I cannot find where to do it in Fox Telem. There is a Funcube control program for Windows but I have not found one for the PI. According to the Fauncube site, alignment is required every time you loose power to the PI.
Also, I presume that the internet interface for the leader board is not supported? When I click on leaderboard, I get a message that it is not supported but when I acknowledge the pop up, the web brouser launches. It does not seem to have this problem when sending or receiving data to the server. Is this normal.
I you would like to call me, my number is 847-514-8566. Thank you for all of the work you put into the Fox in a Box. If I can fix the DC offset problems, I plan to deploy one to Denver, CO and another to McAllen TX.
Sent with [ProtonMail](https://protonmail.com) Secure Email. _______________________________________________ Sent via AMSAT-BB@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
participants (2)
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Burns Fisher -
Doug Phelps