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  2. leonardojc leonardojc joined the community
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  4. 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.
  5. theaftermath started following Tektronix 2245A Oscilloscope, SMPS repair & re-cap
  6. 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.
  7. theaftermath theaftermath joined the community
  8. staffan80 staffan80 joined the community
  9. 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 🤔
  10. 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
  11. mustangDoog mustangDoog joined the community
  12. 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?
  13. 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
  14. aojeda1 aojeda1 joined the community
  15. aojeda1
    Hello, the project's zipped firmware file set is unavailable, is there any way to download the file set?
  16. getbestledlights getbestledlights joined the community
  17. tmadamato@yahoo.com tmadamato@yahoo.com joined the community
  18. ssdflash01 ssdflash01 joined the community
  19. Kelly Kelly joined the community
  20. 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.
  21. swake
    I have a FR632 and a RC832, both use the RX5880 but I am going to modify the RC832. I will include the THS7314 circuit, as you show here: I would like to use sms components for capacitors and resistor as for the THS7314. Is it possible? And if yes, what would be the references?
  22. Mr.RC-Cam
    The most common choice is to use the Boscam RX5808 module. It is very low cost and widely available. There have been reports that the RX5880 has slightly better performance. However I don't believe that the bare RX5880 module is readily available. If you can't find a supplier then the workaround would be to purchase a FR632 and unsolder the modules in it. Not sure if this is worth the effort, that decision is up to you.
  23. swake
    I would like for pleasure, make myself a 5.8ghz video receiver. In your opinion, should I use the Fatshark / IRC or RX5880 module?
  24. Mr.RC-Cam
    They are not open source hobby projects. Instead, they are proprietary designs. So the manufacturer does not publish the schematic. This is suppose to prevent the competition from cheating by cloning their work, but rarely stops the problem. A determined person can create the schematic by reverse-engineering the device. It's a lot of work to do that accurately. A lot of cloned products are bad copies.
  25. swake
    It is surely the kind of thing not found on the Internet, I guess? I would also like to have the schematic of the FR632 but I did not find ...
  26. Mr.RC-Cam
    I cannot offer any specific advice on changing the video level of the FS or IRC module. I would need the video circuit schematic before offering a solution.
  27. swake
    The signal level is set by a resistance network and can not be changed?
  28. Mr.RC-Cam
    On paper, the specs are similar. But in reality, the newer modules have proven to perform better. Range testing shows RF sensitivity has increased. Also FS/IRC compatibility with other brands has improved because the original Airwave modules used different video de-emphasis. De-emphasis on the NexWave is now similar to the other Chinese brands. Correcting the video level is the responsibility of the external circuitry. Before 5.8GHz was introduced it was common to find a video level adjustment POT either inside the module or externally on the main PCB. No, they did not solve the reason for the video level POT. Instead, the designers decided that reducing their manufacturing costs was more important than giving us accurate video levels. Some FPV users that are suffering bad performance are unaware that their video issues are due to incorrect video amplitude. This problem continues to be ignored and it is difficult for the average FPV consumer to troubleshoot.
  29. swake
    So the new FS or IRC modules are no worse than the first models? I opened two modules, an IRC and a Fatshark but I did not find the settings knob to adjust the video output level. How do they adjust this value?
  30. Mr.RC-Cam
    The original FatShark (FS) and ImmersionRC (IRC) 5.8GHz modules used vRx modules with the Taiwanese Airwave chip. They were limited to seven channels. Airwave's published video bandwidth was approximately 5.5MHz. But in practice it was typically less than 5MHz. All the current FPV 5.8GHz vRx's (including FS and IRC NexWave modules) have the Chinese Richwave chip. It supports a 5725 - 5865 MHz frequency range. Its SPI mode allows controlling the frequency with a couple MHz resolution. So that is why so many operating frequencies are possible. As far as I know Richwave does not publish a video bandwidth specification. But I think it is safe to assume that the bandwidth remains the same on the various frequencies. The practical video bandwidth will depend on the module's implemented design, component placement (board layout), and build quality. So you will have to measure your module to determine its real video bandwidth. I suspect that most modules offer something between 4 MHz to 5 MHz.
  31. Strobe Strobe joined the community
  32. swake
  33. swake started following Channels Fatshark, IRC..?
  34. swake
    Originally the Fatshark, IRC modules have 6 channels (5740, 5760, 5780, 5800, 5820, 5840, 5860). When we activate the SPI we get 20 or 30 channels on several bands. The fact of having more channels, does this reduce (or otherwise) the bandwidth of each channel?
  35. swake
    I was think that the 5.8GHz FM demodulation chip (RTC6715) was the same thing that RTC6618.
  36. Mr.RC-Cam
    The RTC6618 is a RF amplifier chip. It could be used with a 5.8GHz FM demodulation chip (i.e., RTC6715 or similar) to help increase range. I don't see the datasheet for it on the Richwave site. I don't know if ImmersionRC's NexWaveRF module uses a RTC6618. You'll have to open one up and look inside. - Thomas
  37. swake
    There is a lot of response on Google for the RTC6715 but nothing for the RTC6618.
  38. Mr.RC-Cam
    Check https://groups.io/g/TekScopes for repair tips and advice on your TEK 7104.
  39. mandoSD49
    Great Job Wish I could do the same with my Textronix 7104 Maybe 1 day. https://www.youtube.com/watch?v=wMGDOzYwLys
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