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  8. Mr.RC-Cam
    I don't have any experience with it. The 3GHz max rating means it is not a good choice for your 5.8GHz vTx.
  9. parallaxx started following DiY RF Power / VSWR Meter. Low Cost!
  10. parallaxx
    Thanks. What do you think about this 30db/5W attenuator? https://www.aliexpress.com/item/BECEN-5W-SMA-JK-RF-Coaxial-Attenuator-DC-to-3GHz-1db-2db-3db-5db-6db-10db/32890661846.html?spm=2114.search0604.3.16.2307134bnGM7Rn&ws_ab_test=searchweb0_0,searchweb201602_4_10065_10068_319_317_10696_10084_453_10083_454_10618_10304_10307_10820_10821_537_10302_536_10843_10059_10884_10887_321_322_10103,searchweb201603_52,ppcSwitch_0&algo_expid=a031472c-049e-4572-9315-26831f2b24da-2&algo_pvid=a031472c-049e-4572-9315-26831f2b24da
  11. Mr.RC-Cam
    The calibration instructions shown for 900MHz are also used to calibrate the other RF bands.
  12. parallaxx
    Hello! How to Slope calibration and Intercept calibration with a 5.8GHz VTX? I don't have a 900Mhz VTX. Thanks
  13. parallaxx parallaxx joined the community
  14. Mr.RC-Cam
    The status update is appreciated.
  15. simonemery555 started following DiY RF Power / VSWR Meter. Low Cost!
  16. simonemery555
    i still haven't got round to getting this sorted with all the traveling for work i'm doing, but didn't want to appear one of those users that just disappear after receiving help. Should be able to get to this when i'm back next weekend
  17. HelmutW HelmutW joined the community
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  19. Mr.RC-Cam
    The Overload warning is not normal with a 30dB attenuator on a 5.8GHz / 25mW vTx. I would suspect battery voltage issues; Try a 3S or regulated 12V adapter (>1A rating). Some more troubleshooting suggestions: Confirm correct value (remove and measure) of the 470 ohm resistor on Arduino Pin A1. Confirm it is installed on the correct pins. Check the voltage on Arduino pin A1. It should be approx 2.1V without a RF signal (remove vTx). Recheck the installation of the 100pF cap that you added to the AD8318. Reconfirm that the meter is set for the correct RF band and attenuation dB. Maybe your vTx is putting out more RF power than expected. If it has programmable RF power then change to lowest setting. Next, try a different vTx.
  20. simonemery555
    no problem! i've now got a cheap attenuator off ebay, received it today, (i know its not ideal, but its all i can find in the UK for less than crazy money) its a 30db one ranging up to 6ghz. Ive not calibrated it as i have no means of another tester yet, but when connecting to a 25mw vtx, it shows overload within seconds, unless i touch the ground of the sma leads. I'm itching to get another tester to calibrate, but is this normal behaviour at just 25mw? i've set the db on the tester to your 30bd profile, as the custom one is stuck at 60db like another poster on here that has this issue. i will attempt to go through the resistors for that. the attenuator im using https://www.ebay.co.uk/itm/SMA-JK-Male-to-Female-RF-Coaxial-Attenuator-2W-DC-6GHz-1-3-6-10-20-30dB-UK-Stock/133037288159?ssPageName=STRK%3AMEBIDX%3AIT&var=432334469683&_trksid=p2057872.m2749.l2649 edit - im using a 2s lipo
  21. Mr.RC-Cam
    Thanks for reporting this. I added a note about the LCD bias adjustment in the flashing/startup instructions.
  22. h0lysm0key h0lysm0key joined the community
  23. simonemery555
    many thanks for this guide. Ive just put this together, but the screen is just solid blue - it does not display any text. flashing was completed successfully and threw up no errors, is there anything i have missed? found it - i had to turn the potentiometer about 8 times clockwise
  24. simonemery555 simonemery555 joined the community
  25. Mr.RC-Cam
    Marking appears to be S10BFC. Repair information and replacement part data is found here: http://forum.rcdesign.ru/blogs/139882/blog21678.html The link above may have info on it.
  26. Arise started following Eachine ProDVR V1.6 Black Screen Fix
  27. Arise
    Hello! What is the 5 pin SMD in the top right corner? I think I have this blown, is this a 1.8V regulator? I need to know maybe the marking on that chip? Also, there is another 5 legs regulator on the other side of the board, what is the marking/model/type of that one? Thanks in advance!
  28. CurtisT
    Thanks! I'll give it a shot. Since I only have the issue when running the video signal through these FCs I am curious to know if they are changing the levels even if there isn't much I can do about it.
  29. Mr.RC-Cam
    The popular diversity vRx modules have a design issue that results in incorrect video levels (low amplitude). So maybe the new OSD is also contributing to this issue and the combination results in a video level that is incompatible with the goggles. Just a best-guess; Without an o-scope measurement it is difficult to know what the real issue is. This DiY tool will help you check for incorrect video levels: https://www.rc-cam.com/forum/index.php?/topic/4126-diy-fpv-video-calibration-tool-low-cost/
  30. CurtisT started following Image distortion/tearing with light to dark images
  31. CurtisT
    I have been battling a difficult video issue with my Attitude V2 goggles for a few months now and came across this site while researching the details of the fatshark rx modules. Hopefully someone can give me some direction in further troubleshooting. I have 2 sets of fatshark attitude v2 goggles. On both sets I have removed the FS rx module and added a female pin header to accept newer diversity modules. I have a eachine pro58 and a realacc5808 module. I have been using these goggles/modules for over a year with no trouble with several quads with and without OSD. I recently built a new fpv quad with an FC with built in OSD and noticed I'm getting distortions in the video that fluctuate with the lighting conditions in the image. I initially tried various parts swaps, multiple FCs, cams, vtx, and different receivers; and it always came down to any FC/OSD I purchased this year have the issue (4 of them) and anything older works fine. I have a boscam fpv watch and the image looks perfect on it all the time. Also a DVR connected to the goggles records the image fine. But when I use these newer FC/OSD I get this distortion in the screens of the goggles. I purchased an original Fatshark rx module and board its soldered to and put that in my goggles. The issue went away. So I believe there is some compatibility issues with my diversity rx modules and newer OSDs on race quad FCs. I thought it might be a vsync issue but am not sure or know how to check. Video of the issue below: I found this post, and some of the info looks like it may apply to my issue. Perhaps a coupling cap on the rx signal would help me?
  32. Mr.RC-Cam
    Thanks for stopping by. Hopefully there is a happy ending to your 2246 repair efforts.
  33. atw58
    Wanted to complement Mr.RC-Cam for taking us along his journey to resurrect such a wonderful piece of gear. I got a defective 2246 from a car repair/reprogramming place which failed 5us trigger A self diagnostics. Was fairly certain the 28 pin triggering logic IC was bad (inputs into the device but no output signals). I got replacement part from Q-Service in Greece ($20 US + $9 shipping). After taking out the old part and installing the IC in a socket the unit was completely dead making only soft clicking sounds. The power supply was non-functional and I haven't tried much troubleshooting yet. I did use an ESR Tester on the caps and meter to measure their values. So far the caps are ok. Your repair tale will hopefully speed up mine. Thank you for being so kind to share your experiences.
  34. Mr.RC-Cam
    That sounds unusual. I would expect that even with a dead battery your scope would still be able to finish the self cal test. But I don't know for sure. Your scope is a different animal because you have the 2245 and mine is a 2245A. Regardless, my best advice is to start by confirming the power supply voltages are correct.
  35. theaftermath started following Tektronix 2245A Oscilloscope, SMPS repair & re-cap
  36. theaftermath
    Amazing work thank you for sharing! I just picked up a 2245 B012747 and trying to run the Self Cal Measurement and it gets stuck running while TURN ALL VAR KNOBS FULLY CW. I've turned the 3 of them and it keeps running. Finding the manual for this B version is coming up empty so far also. No repairs have been done to mine yet but I suspect the battery might have something to do with the continuously running calibration test? Thank you again for sharing the repair on yours, hopefully I can get this working correctly and put into use.
  37. mustangDoog
    Ah, that makes sense. So it's a recording of a synthesized voice, then. I figured the motor revs were likely sampled. Still, that's pretty impressive for an 8-bit AVR. Ah and now I see there was a separate MP3 decoder module. Maybe I should read more closely 🤔
  38. Mr.RC-Cam
    Announcements and motor rev's are pre-recorded wave files stored on a SD card. The Audio Player is controlled by the Arduino. Details: https://github.com/thomastech/CAN2Cluster/tree/master/WaveFiles
  39. mustangDoog
    Cool project! Can I ask how the speech is being synthesized? Surely the arduino isn't doing all of this(Gauges, Motor & Horn, Speech), is it?
  40. Mr.RC-Cam
    The arduino code is available here (Aug-08-2017 post): https://www.rc-cam.com/forum/index.php?/topic/4139-diy-rf-power-vswr-meter-low-cost/&do=findComment&comment=29002
  41. aojeda1
    Hello, the project's zipped firmware file set is unavailable, is there any way to download the file set?
  42. Mr.RC-Cam
    If you look through the HeadPlay HD Goggle Upgrade discussion you will see a photo of a SMT board created by a forum member. Maybe the photo will give you some inspiration.
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