@glovisol
The discone itself NEVER will receice any reasonable signal at low frequencies! It is much to small compared to the wavelength.
Search found 23 matches
- Sat Feb 09, 2019 11:21 am
- Forum: SDR Antennas
- Topic: Extending the range of a Discone antenna down to 3.6 MHz
- Replies: 52
- Views: 163872
- Fri Feb 08, 2019 12:55 pm
- Forum: SDR Antennas
- Topic: Extending the range of a Discone antenna down to 3.6 MHz
- Replies: 52
- Views: 163872
Re: Extending the range of a Discone antenna down to 3.6 MHz
Some time ago I did run some tests and simulations on the antenna at low frequencies. Here you find a comprehensive presentation of the basics. It may help to answer some of the questions. At my installation (l = 15m) the antenna gives good results up to a frequnecy of a wavelength of 4l=60m or f=5M...
- Thu Feb 07, 2019 11:44 pm
- Forum: SDR Antennas
- Topic: Extending the range of a Discone antenna down to 3.6 MHz
- Replies: 52
- Views: 163872
Re: Extending the range of a Discone antenna down to 3.6 MHz
Installing a common mode choke at the upper end of the antenna cable, the antenna will not work at low frequencies. At low frequencies the primary antenna element is the antenna cable. Installing the choke at the lower end results in a completely different antenna: it is a unsymmetrical dipole then,...
- Wed Feb 06, 2019 9:51 pm
- Forum: SDR Antennas
- Topic: Extending the range of a Discone antenna down to 3.6 MHz
- Replies: 52
- Views: 163872
Re: Extending the range of a Discone antenna down to 3.6 MHz
An excelent presentation of the fundamentals of the discone antenna, mounted on a pole, can be found here: https://www.youtube.com/watch?v=vFYVpJ9FPZ8 Please look at 12:20. Sory, it is in German. If you want to run some simulations: the total capacitance of the elements of the DJ-130 antenna is 25pF.
- Tue Feb 05, 2019 9:29 pm
- Forum: SDR Antennas
- Topic: Extending the range of a Discone antenna down to 3.6 MHz
- Replies: 52
- Views: 163872
Re: Extending the range of a Discone antenna down to 3.6 MHz
This has been reported many times before. It even works down below 10kHz. So, a well disgned installation will give you a frequency range of 10kHz to 2Ghz - at full sensitivity (SNR)! Background: at low frequencies the antenna cable (or the antenna pole) acts as a grounded vertical stub antenna. The...
- Fri May 11, 2018 8:03 am
- Forum: SDRuno
- Topic: Ver 1.22 Menus
- Replies: 4
- Views: 14663
Re: Ver 1.22 Menus
And how to store the new setting?
Re: RSP RFI
Why have the modifications not been applied to the RSP1A?
Consequent grounding of the antenna- and the USB-port and/or internal decoupling result in a dramatic improvement in interference immunity.
Consequent grounding of the antenna- and the USB-port and/or internal decoupling result in a dramatic improvement in interference immunity.
- Wed Aug 09, 2017 8:25 am
- Forum: SDRplay related
- Topic: RSP2 & NDB RECEPTION
- Replies: 6
- Views: 18357
Re: RSP2 & NDB RECEPTION
You may take a look at the navy-signals at 20kHz. The narrowband signals (B=200Hz) have a world wide coverage. This will give you an idea on how good your antenna system is. And you can compare your signal to an excellent receiving system at the Netherlands: http://websdr.ewi.utwente.nl:8901/ At my ...
- Thu Jun 01, 2017 8:14 am
- Forum: SDRuno
- Topic: Antenna Referred Power Measurement.
- Replies: 9
- Views: 27193
Re: Antenna Referred Power Measurement.
"dBm" makes a lot of sense! DBm is a logarithmic parameter for rf-power, not depending on the impedance. In the near future it will replace all the last century parameters like dBuV, S-units, receiver sensitivity uV, power.... All modern test equipment like signal-generators, power sources, power me...
- Wed Mar 22, 2017 10:49 pm
- Forum: SDRplay related
- Topic: SDRplay and SDR sharp
- Replies: 11
- Views: 43320
Re: SDRplay and SDR sharp
The latest version is 1530 now. Seems it does not work any more now.someYguy wrote:I just tried SDR# v1.0.0.1500(the latest) with the v2.2 plugin under Windows 7 and it works fine here.....