Search found 76 matches

by radiolistener
Wed Jun 24, 2020 5:08 pm
Forum: Troubleshooting Help
Topic: question about HDSDR
Replies: 2
Views: 848

Re: question about HDSDR

LO is the actual tuning frequency for IF (intermediate frequency). The second frequency control allows to tune on desired frequency within IF bandwidth around selected LO. LO frequency lets tuner know which frequency you're want to get within IF bandwidth. The tuner shift this frequency to the 0 Hz,...
by radiolistener
Tue May 05, 2020 1:25 am
Forum: RTL-SDR Discussion
Topic: RTL-SDR not functioning properly at MW band
Replies: 7
Views: 4466

Re: RTL-SDR not functioning properly at MW band

if you use original RTLSDRv3 it should work the same as usual cheap MW receiver.
by radiolistener
Mon Apr 13, 2020 7:01 am
Forum: Other SDR Devices
Topic: Help with RTL-SDR HF
Replies: 1
Views: 1445

Re: Help with RTL-SDR HF

You're needs to switch into direct sampling mode for HF. Open ExtIO window and select Q-branch
by radiolistener
Sat Apr 11, 2020 1:04 am
Forum: Troubleshooting Help
Topic: FM radio is distorted
Replies: 3
Views: 1412

Re: FM radio is distorted

most of all, these are is distortions due to high gain. Try to reduce RF gain on RTL settings window.

I recommend to disable auto gain and use manual gain tune, it will give you much better result.
by radiolistener
Wed Apr 08, 2020 12:43 am
Forum: RTL-SDR Discussion
Topic: Direct Sampling
Replies: 5
Views: 2147

Re: Direct Sampling

Direct sampling and quadrature is different mode. When you use direct sampling you will get the data from ADC directly connected to antenna (actually through some filter). RTLSDR ADC works at 28 MHz. So, with RTLSDR direct sampling mode you will get just 14 MHz bandwidth. All frequencies above 14 MH...
by radiolistener
Wed Apr 08, 2020 12:27 am
Forum: RTL-SDR Discussion
Topic: VLF kit for a newbie
Replies: 4
Views: 2646

Re: VLF kit for a newbie

You're don't need SDR receiver for VLF. Just connect antenna to the audiocard input and use HDSDR. It works great with dynamic range up to 140 dB. If you use 192 kHz audiocard it will give you 192/2=96 kHz bandwidth, so you will be able to listen any frequency within 0 Hz to 96 kHz range. If you use...
by radiolistener
Wed Apr 08, 2020 12:22 am
Forum: Off-Topic
Topic: If I TX at the same low frequency of the Speakers, will it create interference on sound output?
Replies: 2
Views: 1711

Re: If I TX at the same low frequency of the Speakers, will it create interference on sound output?

it depends on your speakers and audio cable shielding. If it is good enough, it will not affect it much. If shielding is weak, it will affect...
by radiolistener
Wed Apr 08, 2020 12:18 am
Forum: RTL-SDR Discussion
Topic: Performance of R820T v3 dongle
Replies: 7
Views: 2602

Re: Performance of R820T v3 dongle

I tried a lot of different SDR software, they all works almost the same. The most flexible and best quality is HDSDR.

Some of software hiding filter and other setting, so you will be unable to configure it as you wish. But HDSDR allows you to configure almost everything.
by radiolistener
Tue Apr 07, 2020 4:21 am
Forum: RTL-SDR Discussion
Topic: Performance of R820T v3 dongle
Replies: 7
Views: 2602

Re: Performance of R820T v3 dongle

It is disappears, because you're using SDR software with enabled DC filter. Just disable DC filter and it will not disappears. If you don't want to disable DC filter, you can change DC filter bandwidth. HDSDR is configured for 25 Hz bandwidth by default, so all carriers which falls into +-25 Hz will...
by radiolistener
Mon Mar 16, 2020 12:55 am
Forum: Off-Topic
Topic: Dancing radio-waves :)
Replies: 3
Views: 4160

Re: Dancing radio-waves :)

Not the signal itself, but how it shows the atmospheric movements. This is not atmospheric movements. This is over-the-horizon radar. https://en.wikipedia.org/wiki/Over-the-horizon_radar They are used to detect nuclear missiles at long distance. It changes, because direction and shape of radar beam...