Are you fellows using an analog modulator for your WSJT activities (like the KA7OEI circuit) or are you turning it into a digital signal and just hammering the...
... The K3PGP RX gives an enormous roll off with the frequency and in the "frequency domain" the FFTDSP programs are difficult to use with it above some ...
Hello all. Most of us uses FFTDSP programs to extract optical signals for not line of sight optical communication.(eg. cloud bounce) Another way could be to...
I am currently using a plano-convex lens to concentrate all (most) of the LED energy onto my Fresnel lens as described on several web sites. One of the locals...
Last night Rex VK7MO and Justin VK7TW achieved one way communication over a 118km non-line of sight cloud bounce path. Rex trekked to Coles Bay on VK7's East...
We congratulate the whole team on this fantastic success. We are certain this distance is not a limit. We know now that lightning storms are optically...
hello all. My name is allan egleston. I live in Sonora Clifornia U.S.A and am intirested in all forms of communication including this one. Most of the time I...
Hello Allan I have used sunlight when I was younger in an effort to duplicate Ben Franklin's Experiment where he also used, sunlight and candle light to ...
Hi Anthony. Thanks for the comeback Sounds intiristng. I too thought that this was a inactive group when I saw some of the latestsposts 2005 and eariler and...
Greetings All, The report for the 118km non-LOS contact is now available on the REAST Optical page at: http://reast.asn.au/optical.php#20080908 The file is...
Justin Thank you for the report. The wavelengths properties let to expect your signal could be stronger again with infrared. IR high power LED are now...
Yves, The concern I have with high power infrared is that you cannot see the beam and it has the potential to damage your eye. What techniques do you use to...
Good morn guys A basic optical comms kit is available here: http://secure.oatleyelectronics.com//product_info.php?cPath=58&products_id=219 I am not associated...
Hello Justin With LEDs, IR is no more dangerous as with red light. You could use low cost IR LEDs SIEMENS SFH400 to try. Each LED can be supplied with 0,3 A to...
Hi, Be careful. 10 watts into a cone of 16 degrees gives power densities above 1 mW/cm^2 if you are near the diodes. With visible light you get some...
Oatley is well known on the laser list. They have a good reputation for supplying what they advertise as well. Regards, Art...
Art
KY1K@...
Oct 1, 2008 7:06 pm
305
Hello, Yves, I know you are well versed in this topic so please forgive me for saying things that are elementary to you. There may be some members of the...
VK3AFW
vk3afw@...
Oct 1, 2008 11:50 pm
306
Now you guys have me afraid of the 100 watt light bulb in my desk lamp. Rye From: Optical_DX@yahoogroups.com [mailto:Optical_DX@yahoogroups.com] On Behalf Of...
Hi Rye, Well maybe don't be scared, just be respectful. You can burn your fingers if you touch the lamp when it is on, if you stick your fingers in the live...
VK3AFW
vk3afw@...
Oct 2, 2008 12:46 am
308
Hi, You can see a list of my groups on Grouply at the link below. Maybe you'll find some you want to join. allan Here's the link: ...
Greetings All, Two nights ago Rex VK7MO/3 and David VK3HZ conducted non line of sight cloud bounce experiments in VK3. Distances of 111 and 165km were achieved...
I was looking at the r.e.as.t opto comms page and wonder where one can get a telephone hand set like this as seen at this address. Thanks in advance allan...
If you will Google "antique telephone parts" there is a retired telephone man that collects and restores old telephones there. I have purchased a few of these...
Justin, "At 165km WSJT signal levels peaked at -18dB and the elevation was found to be critical." Your experiment confirms Marius F8DO and I said at the...
Hello Yves Thank you for your comments on the gain with low scattering angle. This is an issue we have also been thinking about and it would be useful to have...
Rex All the theory is on the site : http://www.philiplaven.com/index1.html For 10 microns, the typical size of a cloud droplet, you will find the scattering...
Rex All the theory is on the site : http://www.philiplaven.com/index1.html For 10 microns, the typical size of a cloud droplet, you will find the scattering...
Hello Yves Thanks for this advice and the very useful web references. It certainly makes things much more crical for smaller drop sizes. I guess drop sizes...
The web site reference makes interesting reading. One thing that it shows that is not evident in the table of information provided by Rex is that there appears...
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