Jump to content

garris2

Trusted Member
  • Content Count

    31
  • Joined

  • Last visited

Community Reputation

0 Neutral

About garris2

  • Rank
    RC-Cam'er

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. So I had a close look at the cct board again. I removed the channel select button to reveal more clearly whats going on. I can see from the mic the trace goes to some audio amp circuitry then through to a hole taking to the other side of the board.On the RF side a simple trace takes the audio over to a solder pad for audio input to the RF module. I've cut the trace isolating the mic circuitry. I also wanted to make a clean hack for the audio input. So I found that I could remove a resistor between the 5v output connector pin and regulator circuitry isolating the pin.
  2. He's some pics of the RF board. I hope the quality is sufficient to get some useful info. If not let me know and I will take some more. I will do some probing and report back.
  3. Hi Thomas, Feeding the Rf module directly would be my preferred method, thus far I couldn't identify the audio input solder point but I will look at that again. I assume if I correctly identify it I can simply cut the track close to the module to isolate the other Mic circuitry. In case, I will buy some other smd resistors and play around with values as suggested. Thanks
  4. Hi Thomas, thanks for your reply. Its very helpful as always. A reading of the Eagle Eyes manual indicates the audio output level as "line Level". Reading your link and this one about Line_Level I'm going to build a L-Pad attenuator as follows using 0805 smd reistors and fit it inside the transmitter case. I/P voltage: 2v O/P voltage: ~ 3mV R1 = 100Kohms R2 = 150ohms Will report back. Best Regards Geoff
  5. Hi everyone, I bought this Video_Tx for use in my ground station as a repeater up to my goggles. At the time I didn't realize it doesn't accept external audio but instead has a little mic built in. I want to know if I can remove the mic and wire up my external audio to the solder pads adjacent to where the mic was located? Would I require a resistor (value?) between the audio source and solder pad? The external audio source is just one of the audio outputs of an Eagle Eyes. Any tips or advice greatly appreciated. Geoff
  6. I've decided to go down the PWM to PPM converter route in the meantime as I don't think there is enough interest in the ET OSD community at the moment to warrant Bills time and effort. Geoff
  7. Thanks for your replies guys, the OSD's makers name is Bill (no more clues will be given). I will try to sweet talk him and in the mean time I might try to build the project above. I looked at the FrSky receivers as linked by Kilrah but they are limited to 10 channels and I would like to make full use off my 12 available channels with my existing system. Geoff
  8. Hi all, I'm looking for a Futaba SBus to PPM converter. Does anybody know of such a thing with a proven working track record or would anybody be interested in building such a thing? (Hint to Thomas) I'm sure it would be a great seller. SBus protocol I can't vouch for the accuracy or completeness. http://www.flightronic.com/index.php?page=futaba-s-bus-protokoll There is also this but it is sold as a pcb only and I dont have the knowledge to program it, ( I could build it), I could not find any reports attesting to reliability, some negative actually. http://ddfpv.de/pr
  9. New Update. password: 2.4G RC off Here is a sort clip where I turn off my 2.4G RC Tx to compare what my video is like when RC is On/Off. At about 49sec into the video I turn off my RC Tx (after RTH has manually been engaged) and I think there is a slight improvement in video quality. At the 1:26 mark I turn 2.4G RC on again and a barely perceptible decrease in video quality can be seen. And then again at 1:43 I turn RC off and on again at 1:53 Conclusion: I think its ok in my case to have the 2.4G RC Tx Yagi positioned so close to the 1.2G VRx yagi. Geoff Edit: Wel
  10. Update: Ok, I have tested as suggested following the proceedure in Post #4. I applied my DMM to the RSSI output of the Lawmate receiver with all transmitters turned off. The reading was 124.4mV. This reading was a bit low I thought, so I verified by turning the video Tx on and the RSSI went to 3.78v I turned the video Tx off again, RSSI went to 124.4mV and then I turned on my RC Tx and WiFi Amp. Both LEDs on the Amp illuminated indicating power and signal were applied and received. I noted the RSSI voltage of the Lawmate VRx and it was still solidly at 124.4mV i.e. there was
  11. Thanks guys, I'm setting up with an OMM dual Notch filter at the moment too on my video Tx. Geoff
  12. Thankyou again for your replys Mr RC-Cam and Terry. I will give those tests a try as soon as I can. I actually have one of those DPCAV RSSI display meter kits connected onto the Rx already, would it be helpful in performing some testing? In addition to the testing above I guess I could power everything up, note the RSSI level and then turn off the RC control Tx and note the reading again. Actually thats probably not all that dissimilar to what you have suggested Terry. Yes I do have a RTH system set up and working well. On a side note, I turned off my other RC Tx (JR) once, mid air, an
  13. Hi Terry, thanks for your reply. I have tried it, 1 flight so far and it seemed to work fine. RC control was no problems although video was not as good as previously but that could also be due to the fact there were 3 of us FPVing at the same time all on the 1.2/1.3G band on different channels. I'm wondering what general radio knowledge others have in relation to close proximity of Tx and Rx antennas. Why do I want 2W of power into a 7dBi aerial. Well they don't make .5W boosters so you go with what you can get. The 7dBi yagi was on hand too, and of a reasonably compact size so I thought i
  14. Hi all, I have a 1.2G 12dBi Yagi mounted on my antenna tracker and I recently added a 2.4G 7dBi next to it, about 3 inches seperation. I can't seperate the antennas any further whilst still having them on the same antenna tracker. The 1.2G is for my video reception and the 2.4G is for my RC Tx to aeroplane. The 1.2G is feeding into a standard Lawmate Rx channel freq 1280 (http://www.nghobbies.com/cart/index.php?main_page=product_info&cPath=1_5_93&products_id=179) and my 2.4G is being feed by this booster (http://cgi.ebay.com.au/Powerful-2W-33-DBm-WiFi-802-11b-g-Booster-Amplifier-/2
  15. I guess I don't get any prize for guessing but I don't think they have a 1.2G 1W tx, but they do give great service. I guess you can't have everything. Geoff
×
×
  • Create New...