3rd: https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC_fiber%20optic%20active%20dipole_TX3.jpg The optic cable is 9m long. Am 08.07.2013 02:04, schrieb Stefan Schäfer: another image of the TX: ht
another image of the TX: https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC_fiber%20optic%20active%20dipole_TX2.jpg Am 08.07.2013 01:59, schrieb Stefan Schäfer: Hi all, OK, although it can't work
Hello Stefan and Roelof! Very interesting. Thanks for all technical information! Lubos, OK2BVG Date: Sat, 27 Jul 2013 02:12:54 +0200 From: [email protected] To: rsgb_lf_group@blac
Hi all, Well, somehow i didn't want to stop, so i now built the RX too: https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC_fiber%20optic%20active%20dipole_RX.jpg I made some changes in the RX sche
Hi all, Well, somehow i didn't want to stop, so i now built the RX too: https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC_fiber%20optic%20active%20dipole_RX.jpg I made some changes in the RX sch
Hi Jay, Thanks for the suggestion. Well, i also had some thoughts on the balance issue. The battery is mounted to the dipole half that is connected to source of the FET. The battery itselfe should ha
Still no measurements, however i saw that i can receive my 630m transmission in 1 km distance at 35 dB SNR just when running the RX and the optical-electrical converter (i.e. LED OFF) so i had to put
Hello Roelof, Is there some progress on your side? I may have some useful informations for you. In the last test i found that i need more gain and in the end i want to have a fiber optic antenna that
Hello Stefan, I have purchased some SFH250V's and SFH757V's. I assumed that the SFH250V is a photo transistor like the SFH350V, however it is a photo diode and requires additional circuitry. Thank yo
Hi Roelof, Am 26.07.2013 17:15, schrieb Roelof Bakker: Unfortunately RS does not sell to private persons in the Netherlands. It is the same in Germany. I can order from the university... Today i carr
Hi to all, in Italy RS-COMPONENTS sells to private persons without problems .. Probably in the Netherlands too. 73 de Mauro IK1WVQ At 22.07 26/07/2013, you wrote: Hi Roelof, Am 26.07.2013 17:15, schr
Hello all, There is a real progress again this night with my fiber optic LF/MF/VLF RX system. I am now using a SFH250V photo diode (fast switching) and a different optical/electrical converter circui
Hello Stefan, I have continued my optic feedline tests with the SFH757V as transmitter and a SFH250V as receiver. The latter was lashed up reverse biased to V+ and with a 56K resistor in series. From
This must be the same as Birds sitting on HV lines ? no earth ref point ? using some form of small loop and the optic link would give good results , being totally isolated from earth, but, the transm
Hello Roelof, Am 28.07.2013 15:34, schrieb Roelof Bakker: The loss was flat between about 300 kHz and 1 MHz. Just like here. Looks like we are quite far away from the cutoff frequency of the system.
HI Stefan, Owen, VK1OD, has done a similar experiment and has placed a video on youtube. Have a look at his updated web page: http://vk1od.net/antenna/PA0RDT-MiniWhip/index.htm 73, Dimitris
Hello Stefan, Thank you for your comments. Though this is a far from optimum system, the signal to noise ratio was poor. At least much worse than my current mini-whip set up. I have a feeling that th
Well , Roelof Now you can join the list , with the Bumble Bee , Opera , and other things that cannot possible do what there supposed to do , but do it very well just the same ! Some comparative test
On 08/07/2013 02:31, Stefan Schäfer wrote: Well, somehow i didn't want to stop, so i now built the RX too: https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC_fiber%20optic%20active%20dipole_RX.jpg
Stefan! I don't know 3.26 AM, I remember doing things like that in my younger days. My Mother got out bed and asked me was I going to come to bed ever when I was building the Mullard all Valve Tape R
