Search found 47 matches

by radiolistener
Fri Sep 13, 2019 12:15 pm
Forum: RTL-SDR Discussion
Topic: Listening to AM radio
Replies: 6
Views: 175

Re: Listening to AM radio

This one doesn't support frequencies below 24 MHz. You're needs RTLSDRv3.

But this blue also can be modified in order to use frequencies below 24 MHz, but it's not easy and it will be much more easy to buy RTLSDRv3 which support it out of the box.
by radiolistener
Mon Aug 26, 2019 6:38 pm
Forum: Antennas
Topic: Signal Splitting?
Replies: 17
Views: 1187

Re: Signal Splitting?

you cannot use one antenna for 4 divices simultaneously with no loss, because signal strength will be divided by 4. You can use 10-20 dB LNA amplifier before splitter in order to fix it, but amplifier will add IMD distortions. So, the only way to use it with no loss and no distortions is to use ante...
by radiolistener
Mon Aug 26, 2019 6:27 pm
Forum: RTL-SDR Discussion
Topic: Showing wave form on an oscilloscope.
Replies: 4
Views: 486

Re: Showing wave form on an oscilloscope.

you already see it on the scope, but it is mixed with other signals and noises which level is higher. For exampel, -90 dBm means amplitude of 7 uV (micro-Volt). You can use narrow bandpass filter and about 80 dB amplifier in order to get it visible on oscilloscope. But your oscilloscope should have ...
by radiolistener
Sun Aug 25, 2019 2:32 pm
Forum: Antennas
Topic: Adjustable Matching Transformer Exist ??
Replies: 4
Views: 414

Re: Adjustable Matching Transformer Exist ??

rtlsdrblog wrote:
Fri Aug 23, 2019 12:57 am
But remember that by matching impedance you're only affecting SWR.
antenna tuner also can be used as pre-selector tunable bandbass filter
by radiolistener
Sun Aug 25, 2019 5:41 am
Forum: RTL-SDR Discussion
Topic: RTL.SDR Chinese USB Device
Replies: 16
Views: 1208

Re: RTL.SDR Chinese USB Device

since there are several peoples reported issues with SDR#, it looks like SDR# issue. Most of all it has some mistake in the code, so it fails. Try to use HDSDR it works stable.
by radiolistener
Mon Aug 19, 2019 10:49 am
Forum: Antennas
Topic: Signal Splitting?
Replies: 17
Views: 1187

Re: Signal Splitting?

just connect your antenna to antenna switch input and all your sdr receivers to antenna switch outputs. Then just switch antenna to selected sdr receiver which you're want to use.
by radiolistener
Mon Aug 19, 2019 8:28 am
Forum: Antennas
Topic: Signal Splitting?
Replies: 17
Views: 1187

Re: Signal Splitting?

For Amateur VHF lets say 4. it's better to use antenna switch, something like this https://www.mfjenterprises.com/Product.php?productid=MFJ-1704N Because splitter add loss and you will get worse signal on the output of splitter. Antenna switch allows you to connect antenna to selected device with n...
by radiolistener
Sun Aug 18, 2019 8:51 pm
Forum: User Projects
Topic: A Funny/Interesting SDR# Project
Replies: 5
Views: 596

Re: A Funny/Interesting SDR# Project

I think it will be better to see it in such way :) clear all close all data = imread('c:\49mhz\p3.png'); data = rgb2gray(data); data = data(end:-1:1,:); data = double(data); data = fftshift(data,2); data = ifft(data,[],2); data = ifftshift(data,2); data = reshape(data.',1,[]); iq = data / max( abs(d...
by radiolistener
Sun Aug 18, 2019 12:04 am
Forum: RTL-SDR Discussion
Topic: SDR# issues
Replies: 11
Views: 839

Re: SDR# issues

I say its a .net issue but given its installed with windows 10 i cant reinstall it to see if that fixes the issue. This is NOT .net issue, this is 100% guaranteed. This is memory management issue. .net doesn't have memory issues, because it is designed to avoid them. This issue caused by some unsaf...
by radiolistener
Sat Aug 17, 2019 5:04 am
Forum: RTL-SDR Discussion
Topic: SDR# issues
Replies: 11
Views: 839

Re: SDR# issues

This error happens due to corrupted memory. It may be due to hardware issue (CPU failure, RAM failure or Motherboard failure). Also it may be due to drivers error or due to mistake in the software. But since there are no other reports about this issue from other users of SDR#, it seems that the root...