Search found 123 matches

by sdrom33
Sun Jul 14, 2019 9:25 pm
Forum: Spectrum Analysis
Topic: Evaluating RF filters?
Replies: 19
Views: 1643

Re: Evaluating RF filters?

Mike, it seems to me that your filter is low pass filter, e.g. suppresses MW & higher band to let you get the LW band. I am under the impression, .maybe I am wrong, that Franko wants a high pass filter, to suppress MW in order to listen to HF from 1.9 MHz & higher, as shown by glovisol.
by sdrom33
Sat Jul 13, 2019 6:00 pm
Forum: SDR Antennas
Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Replies: 59
Views: 5685

Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna

Hi Phil & Gianfranco, it seems to me that this thread, that had to be closed, because it had become "toxic" according to some guys, is by contrast showing a lot of useful information on small antennas. This is a lesson to us all that a good discussion on technical problems and data is only "toxic" f...
by sdrom33
Wed Jul 10, 2019 10:56 am
Forum: SDR Antennas
Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Replies: 59
Views: 5685

Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna

Phil,

Thanks a lot for your help & guidance. I am studying the references, got a lot to learn in practical antennaship & will get back to you when stronger on my legs. Seems glovisol is having a ball with your concepts!
by sdrom33
Wed Jul 10, 2019 10:52 am
Forum: General
Topic: hdsdr?
Replies: 2
Views: 548

Re: hdsdr?

LNA gain depends on noise level of your antenna. Get a signal and then adjust for best S/N.
For mouse you should go to the mouse controller & change settings.
by sdrom33
Tue Jul 09, 2019 6:59 am
Forum: SDR Antennas
Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Replies: 59
Views: 5685

Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna

Hi Phil, Too bad your effort for analysing the proposed whip antenna has fallen on deaf ears. It is also too bad nobody thanked you for your work: on my part I gratefully thank you. I do not understand the reason why one should be offended if you presented a learned judgement warning that the antenn...
by sdrom33
Mon Jul 08, 2019 9:56 am
Forum: SDR Antennas
Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Replies: 59
Views: 5685

Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna

I can see in Lankfort schematic a very good ground plane - that 4 to 8 foot long copper coated earth ground - the best ground plane etc. Etc...... Mike I really do not understand if this is just irony, just for laughs, or if you really believe in this nonsense you have written...You mean to state t...
by sdrom33
Sat Jul 06, 2019 6:24 pm
Forum: SDR Antennas
Topic: Antenna for LW
Replies: 14
Views: 6241

Re: Antenna for LW

The US navy has been using VLF with giant antennas to communicate with submerged submarines since the sixties of last century. They have three sites around the world for this very purpose. Loop antennas are certainly more efficient in VLF than "relay tuned 15' noise reducing vertical antennas", even...
by sdrom33
Sat Jul 06, 2019 6:18 pm
Forum: SDR Antennas
Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Replies: 59
Views: 5685

Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna

Phil, You need a lot of real estate for a Delta Loop antenna. The example ground plane you show is tuned to just 7 MHz. The TCM promises wide band coverage, from 160 m to 6 m at least... zero gain is no problem if the location you are in is noisy above a certain level. So these are the plus consider...
by sdrom33
Fri Jul 05, 2019 11:05 am
Forum: SDR Antennas
Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Replies: 59
Views: 5685

Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna

I have been considering this TCM design and planning to do it with 300 mm dia. PVC water pipes supporting a steel mesh. In this case a self supporting wide band antenna could be made with minimum expense and no external supports. Non resonant ground reflector could be made with conducting cloth chea...