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Attention: RC-CAM.com will be closing down August 2021.

The RC-Cam.com forum was the very first online community dedicated to the advancement of wireless video cameras on radio controlled (R/C) models. This is now called "FPV" (First Person View). We are proud of the contributions that our members have made to the FPV hobby.

We've seen significant changes over the last twenty years. Initially there were a lot of eager R/C hobbyist that built their own video systems. Allowing these creative individuals to share their work was the purpose of this site. Now the FPV market is flooded with low cost systems; Sadly DiY FPV video projects are now rarely discussed.

RC-CAM.com (main site and forum) will be closing down August 2021. This is being announced now (March 2021) so that everyone has time to download any information that is important to them. After the site is shutdown the information will no longer be available here.

We appreciate every member's involvement with advancing the FPV hobby. It is indeed sad to say goodbye to all our online friends. Be safe and stay healthy.


interference source guessing

Reely340
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Reely340

Reely340 0

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Has anybody got an idea where the interference in the center of that video snapshot might originate from?

I'm amazed by the almost digital look of the bright/dim changes and the very sharp vertical boundary of the interference.

At app. 120 black/white changes per line, the frequency would be: 625 (PAL) x 25 fps x 120 = 1.875 MHz

given the vertical span of 1/10 of 576 visible lines the duration is 625/(576/10) x 1/25 = 3,5ms interference duration.

1.875MHz for 3.5ms, does that ring any bells?

The setup: test inside residential building,

distance 8 yards, one wall in between, signal quite strong

200mW, f=980MHz e.g. not inside Austrian 900MHz cell phone band (890-960)

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Mr.RC-Cam

Mr.RC-Cam 129

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It is external interference of some kind. Could be anything: something located near or far from the flying location, or something you bring with you to the field.

Also, don't ignore any RF sources that are not on your exact frequency. Strong RF that has a frequency that is vastly different from your Rx's RF channel can still affect your system.

BTW, when it comes to recognizing noise issues, a high quality video recording is much more useful than a still photo.

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