We have been testing a 35 photodiode optical receiver for cloud bounce and achieved: 1. Significantly improved voice communication over a 1.2 km path 2. WSJT...
Rex, Justin and Ken, you did a very good work ! You have demonstrated a property I believe very long time ago : For optical cloud bounce, the TX beam and the...
Yves Thank you for your kind comments on out experiments with the Multi- ... A circuit diagram has been added to the VK7MO photos (last item) which shows the...
We have been checking signal levels using the 60 Luxeon TX and 35 photodiode RX each evening over the last 12 days on the 27 km path from VK7MO to VK7DY. In...
Rex, Justin and Ken, you noticed : "1 day unexplainable a there were good clouds and no rain or mist" During our 40 Km cloud bounce laser tests we also...
Thanks Yves for your thoughts. We have compared signal levels with Relative Humidity profiles measured by radiosonde around the centre of the path and withing...
... Rex, Justin and Ken I have seen your "relative humidity profiles" graphs with a very great interest. It is probably very difficult to evaluate the cloud...
Yves Thanks for your further advice. The Luxeons we are using are Red with a peak response at 627 nm. From our tests we agree with you that the variation of...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the Optical_DX group. File : /Cloudbounce...
Optical_DX@yahoogroup...
Nov 18, 2007 2:44 am
251
We have added a file to demonsrate voice via cloud bounce over a 27 km path from VK7MO to VK7DY. The evening started with mist and light rain and no signals...
Tonight we had no clouds but signals were still very good and steady at -8 to -9 dB on WSJT. We assume this is particle scatter. 73 Rex VK7MO, Justin VK7TW...
Greetings All, I have just uploaded two reports to the REAST Optical pages. The first is a field comparison between Rex VK7MO's 35 photodiode Fresnel receiver...
Justin VK7TW, Rex VK7MO & Ken VK7DY, What is the hardware differences between the KA7EOI RX design built by VK7TW using one photodiode and the KA7EOI RX...
Tonight (22 November) Ken VK7DY went portable to try to extend the distance for cloudbounce from Rex VK7MOs location and got good results as follows: 36 km:...
Hello Yves and Marius Thank you for your anaylisis. We tend to agree with you that the number of photons drops as inverse to the 4th power of distance (like ...
Apolgies but the web site took away the 2 column formatting in our last reply. The comparsion of the two single photo-diode receivers should read as follows: ...
We have prepared a more detailed report of our Increased Distance Cloudbounce tests which can be downloaded at: http://reast.asn.au/optical.php The tests show...
Rex, The hardware comparison of the two single photo-diode receivers VK7TW Version of KA7OEI receiver and the VK7MO Version of KA7OEI receiver does not show ...
Rex, You wrote : "We have found that an increase in transmitter power of 3 dB produces a 6 dB improvement in output signal to noise ratio. This sounds like...
I did some new tests with our K3PGP RXs at extremely low levels. I used a good BF generator to drive a red LED in a square wave on/off modulation. I did test...
Tonight signals at Ken, VK7XDY's, home, 27 km away, were very good at -6 dB on the WSJT scale. This followed heavy rain the prevous evening that appears to...
Happy New Year to all, This morning's New Year celebration fireworks provided an opportunity to record fireworks through an optical receiver. I have edited the...
Hi Guys Firstly my apologies if this posting is offensive to anyone or out of line. It is certainly not intended to be, and I am not selling anything or asking...
Hello, After some work, I have gotten a web page describing the 1963 effort by the EOS (Electro-Optical Systems) Amateur Radio Club to break a distance record...
Clint, Thank you for this very interesting report ! I am cherching others experiment report that could be also very intructive but I never find the initial...
I've wondered what the Aurora Borealis and other natural plasma displays _sound_ like, if detected optically. The plasma is surely modulated by the currents...
Folks, I'm building an optical receiver using an 11" Fresnel at the end of two stacked plastic buckets. http://rightime.com/images/WAAS/dscn5246a.jpg ...
Hi Tom, I'm not sure what you're trying to achieve. In particular, the role of the camera is unclear. Most of the systems used here have a Luxeon LED as...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
