Search found 112 matches

by F1BJB
Thu May 24, 2018 7:59 am
Forum: SDR Antennas
Topic: Cheap broadband planar elliptical dipole antenna
Replies: 7
Views: 2091

Re: Cheap broadband planar elliptical dipole antenna

Thanks Phil, I have made some other small/simple improvements to other antennas. One was adding an extra square plate Reflector to a 15 Element yagi for L-Band Aero signals. Which in turn gave an extra 6dbi (One S point) increase in signal strength. Hi Most Yagi design have only a single reflector....
by F1BJB
Thu May 17, 2018 12:25 pm
Forum: General
Topic: Clear Recommended Computer requirements (for RSP on a Laptop)
Replies: 10
Views: 6550

Re: Clear Recommended Computer requirements (for RSP on a Laptop)

Hi I too think that it totally depends of what you want to do with the RSP and the software you intend to run. Receiving NDB and DVBT2 HEVC signals have very little in common. Neglected important features of the computer used are: It's power consumption. It's EMC performance. Performance of it's USB...
by F1BJB
Wed Dec 27, 2017 11:00 am
Forum: SDR Antennas
Topic: Degaussing Coil as a Loop style Antenna
Replies: 2
Views: 2022

Re: Degaussing Coil as a Loop style Antenna

Those multi turn loops have a drawback: parasitic capacitance.
It is very hard to get a decent tuning range with current variable capacitors.
by F1BJB
Sat Dec 23, 2017 7:06 am
Forum: SDRplay related
Topic: Ethernet
Replies: 2
Views: 1496

Re: Ethernet

Only gigabit Ethernet is better than USB2 and the difference is not very big.
And if you have to use POE it gets complicated.
by F1BJB
Tue Oct 10, 2017 2:43 am
Forum: SDRuno
Topic: Excessive CPU usage
Replies: 4
Views: 2714

Re: Excessive CPU usage

I had this problem with windows 7 and many audio/video related software's. It is not related to SDRuno I tried a lot of tips from various sources with no effect. It seems that the problem mysteriously vanished and I don't know if it was due to an update from Microsoft or the installation of a softwa...
by F1BJB
Wed Oct 04, 2017 3:14 pm
Forum: New Users' experiences
Topic: PC (laptop) power induces significant noise
Replies: 16
Views: 11025

Re: PC (laptop) power induces significant noise

PC monitors or their cables can also produce interference A trick is to start a recording then switch off and disconnect everything from your PC : keyboard, mouse, monitor,speakers , etc Then play back the recording. Of course for a laptop you are limited :) I also found that sometimes interference ...
by F1BJB
Wed Oct 04, 2017 1:47 pm
Forum: SDR Antennas
Topic: antenna seperation
Replies: 4
Views: 3148

Re: antenna seperation

This is a complex question there is no simple answer. It depends : On the transmitting power used On the directional properties of both antennas On the polarisation of the antennas On the presence of filters in front of the receiver to reduce the signal of the transmitter If you want to use both at ...
by F1BJB
Mon Oct 02, 2017 2:33 pm
Forum: SDRplay related
Topic: Blew up antenna port A on my new RSP2. :(
Replies: 4
Views: 2504

Re: Blew up antenna port A on my new RSP2. :(

On many DVBT dongles the diodes are directly connected to the RF input
So any DC on the coaxial kills them.
Bad design a small capacitor is needed.
by F1BJB
Tue Sep 26, 2017 8:59 am
Forum: SDRplay related
Topic: Choppy/Stuttering audio across platforms.
Replies: 25
Views: 17370

Re: Choppy/Stuttering audio across platforms.

Hi 10MHz span is useful to search visually a wide band for activity but ,except for DVBT and DAB, it is always better to limit the span as much as possible when actually demodulating a particular signal. I have found that 1.5Mhz has 2 side notches that can be very useful to prevent overload by local...
by F1BJB
Mon Sep 18, 2017 8:23 pm
Forum: New Users' experiences
Topic: DRM reception with SDRPlay and SDRUno
Replies: 12
Views: 8237

Re: DRM reception with SDRPlay and SDRUno

supwiddiss wrote:Could someone kindly post a few DRM freqs receivable in the USA?
I have it working with the help of a test file. But so far, no live reception.
Thanks!

Hi
As far as i know there are very few.
The best way is to look/ask here:
http://www.drmrx.org/forum/

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