Search found 54 matches

by radiolistener
Sat Nov 16, 2019 7:34 pm
Forum: Other SDR Devices
Topic: SDRplay announces the RSPdx
Replies: 6
Views: 544

Re: SDRplay announces the RSPdx

Was that comparison done for HF? yes, this is done on HF. You can see screenshot above. On VHF, SDRPlay has significantly worse sensitivity than RTLSDRv3. And, if so, was the RTLSDRv3 in Direct Sampling mode or using an up-converter. I tested RTLSDRv3 in Direct Sampling mode. With no filters and no...
by radiolistener
Sat Nov 16, 2019 5:54 am
Forum: Off-Topic
Topic: whatever happened with mirics?
Replies: 3
Views: 195

Re: whatever happened with mirics?

they developed this chipset for tv dongles. But now tv is outdated. So, they transformed into SDRPlay and now selling tv chipsets as SDR receivers. The same as RTLSDR. But RTLSDR is more open hardware.
by radiolistener
Fri Nov 15, 2019 1:04 pm
Forum: RTL-SDR Discussion
Topic: distorted FM
Replies: 12
Views: 462

Re: distorted FM

I recommend to use HDSDR. Because SDRuno and SDR# is too buggy.
by radiolistener
Fri Nov 15, 2019 9:17 am
Forum: Other SDR Devices
Topic: SDRplay announces the RSPdx
Replies: 6
Views: 544

Re: SDRplay announces the RSPdx

> "Hi-Z" is a marketing thing which is usually used for bad design RF frontend. Why? If I understand it correctly, a Hi-Z input makes it easy to connect a long piece of wire and use that as an LW/MW antenna. There are two reasons: 1) high impedance leads to high thermal noise 2) impedance matching ...
by radiolistener
Thu Nov 14, 2019 9:19 am
Forum: Other SDR Devices
Topic: SDRplay announces the RSPdx
Replies: 6
Views: 544

Re: SDRplay announces the RSPdx

Hi-Z input? "Hi-Z" is a marketing thing which is usually used for bad design RF frontend. The same thing with "14 bit" taken with decimation and which works worse than 8 bit ADC from RTLSDR. The only good thing of these RSP is 8 MHz bandwidth. All other things are just marketing. If you want better...
by radiolistener
Sun Nov 10, 2019 9:09 am
Forum: Troubleshooting Help
Topic: RTL-SDR Dongle V3: Frontend Effecting Filter Response, Manufacturing Fault?
Replies: 7
Views: 533

Re: RTL-SDR Dongle V3: Frontend Effecting Filter Response, Manufacturing Fault?

I have similar noise gen: https://www.aliexpress.com/item/32845101232.html it has about 6-10 dBm RMS output measured for DC...500 MHz bandwidth and about 6 Vpp peak pulses on the output. So, I think it will be not safe to connect such noise gen output directly to SDR receiver. You're needs to use 20...
by radiolistener
Thu Oct 17, 2019 7:31 pm
Forum: Other SDR Devices
Topic: Weird MSI.SDR QRM issue
Replies: 2
Views: 434

Re: Weird MSI.SDR QRM issue

The same thing. Also bought on aliexpress. But my msi.sdr is defective, it has terrible sound crackles and pulses at some LO frequencies: https://www.rtl-sdr.com/forum/viewtopic.php?f=4&t=4740 Also it has very bad sensitivity at 145 MHz, much worse than RTL-SDR. This is just a piece of crap. I think...
by radiolistener
Fri Sep 13, 2019 12:15 pm
Forum: RTL-SDR Discussion
Topic: Listening to AM radio
Replies: 10
Views: 1242

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: 3835

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: 5
Views: 1879

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 ...