FernRF
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FernRF commented on Kieran's blog post Using APSync to Build a Long Range Digital Video Link
"Very interesting. Thanks!"
Friday
FernRF commented on Kieran's blog post Using APSync to Build a Long Range Digital Video Link
"APSync might theoretically be used with a two-version version of the software for this project: http://diydrones.com/profiles/blogs/new-fpv-option-fpv-hat-for-raspberry-pi We have been working on a two-way version of the software for the FPV HAT but…"
Apr 17
FernRF commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"@AndrewZ: Encryption is per-packet. So one bit error will affect the whole packet. But there are many packets per second, so in practice it equals a larger number of "normal" errors which the h.264 decoder handles fairly well."
Apr 2
Andrew Zaborowski commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"Thanks.  Interesting about the image degradation... I wonder how that works mathematically since a single bit error in the ciphertext is supposed to, on average, affect 50% of the decrypted plaintext, for a good cipher."
Apr 1
FernRF commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"@Andrew: We'll try and give some indication of latency in an upcoming video. Image degrades fairly gracefully, also with encryption enabled. FernRF"
Apr 1
Andrew Zaborowski commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"Also by the way will the image quality also degrade in a similar way with encryption enabled?  Or will transmission errors cause a total loss of the frame or blocks of the frame, as could be expected?"
Mar 31
Andrew Zaborowski commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"Some total end-to-end latency figure (glass to glass I think the call it) incl. rapivid and your choice of a display device would be good to have when you get around to benchmarking it.  Thanks!  Look promissing."
Mar 31
JeanLeFlambeur commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"@FernRF: Thanks a lot for the details. You got me hoping I can revive the 4463 project. Can you post some video with the bitrate at this bitrate?"
Mar 27
FernRF commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"@JeanLeFlambeur: If I remember correctly, we use the 128 byte one. FernRF"
Mar 27
FernRF commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"@JeanLeFlambeur: Sure. You are right about the specs. And yes, -88dBm is usable. Its just that the SiLabs software has this limit, combined with the fact that we never managed to push it much beyond 500 kbit. FernRF"
Mar 27
JeanLeFlambeur commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"@FernRF Actually the datasheet says the max is 500k symbols per second. With 4FSK a symbol is 2 bits so a max rate of 1Mbps. This is well within the specs. The RX sensitivity @1Mbps is -88dBm which is very usable. Regarding the fifo, I was…"
Mar 27
FernRF commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"@FernRF: Its true that the data sheet says 1 mbit. And the hardware might even support it. But SiLabs configuration software only allows initialization up to 500 kbit. I suspect that the receive sensivity gets so low that it isn't worth it. But…"
Mar 27
JeanLeFlambeur commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"@FernRF: thanks a lot for the hint PA. I will definitely check out your code. It might be what you mention, maybe I got the wrong frequency modules or I had the wrong configuration - even though I doubt it, I was measuring with a SDR and spot on 433…"
Mar 27
FernRF commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"@JeanLeFlambeur: Come to think of it, your problems might related to some challenges we had earlier on. It is possible to run the si4463 chip outside the specified module PA freq range. In that case its only the si4463 chip inside which transmits.…"
Mar 27
FernRF commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"@JeanLeFlambeur: Sorry to hear that. We haven't seen that issue. Current products are made with version 2.1. Only issue have been some early problems with the 915 mhz variant. But these were caught by our QC. We buy the modules directly from…"
Mar 27
JeanLeFlambeur commented on FernRF's blog post New FPV option - FPV HAT for Raspberry Pi
"@FernRF - do you happen to know what version they are? I tried to get 2 of them to work for 3 months without success. They got unstable at higher power levels (>50mW) and the power rail got a lot of noise. My guess is that the power amplifier…"
Mar 27

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About Me:
Hardware design, open source
Please tell us a bit about your UAV interest
Fixed wing UAVs
Hometown:
Copenhagen

FernRF's Blog

New FPV option - FPV HAT for Raspberry Pi

Posted on March 26, 2017 at 1:28pm 18 Comments

Hi all,…

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