Questions tagged [software-defined-radio]
Radio devices that use digital signal processing in place of analog electronic components to manipulate RF signals.
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Help synchronize on unknown frequency sequence
I am having trouble to synchronize on a frequency hopping pattern between an emitter Tx and a receiver Rx. More precisely, the ...
user21560
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2
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Is number of items in`file sink` integer multiple of `sample rate`?
I use flow graph for file sink as below:
When I stop running this flow graph, there are 110000 float numbers in file ...
- 650
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What's the usage of `Multiply Const 1` and `Multiply Const 0`?
Based on Gnuradio,
Multiplies the input stream by a scalar or vector constant
(element-wise if vector).
output = input * constant
In above web page, I found ...
- 650
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1
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what's the usage and benefit of segments in Gnuraio `file meta sink`?
In Gnuradio website,
Max Seg. size is Length of a single segment before the header is repeated (in items)
At first,I think ...
- 650
2
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1
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Are there major advantages to using DVB-S2 vs CCSDS (or vice-versa)?
In Cubesats, DVB-S2 and CCSDS are both equally present as communications standards.
Are there really any pros and cons, that is - a "best choice for a given application", or are they just ...
- 163
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276
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How to set external clock of `--device-settings` in soapy_power?
External pps equipment connected with USRP.
In soapy_power,I set --device-settings 'clock_source=external' but failed.
...
- 650
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1
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838
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Why can't I get the radio/waterfall to show in SDRAngel - GQRX works fine
I was wondering why the digital decoder in SDRAngel wasn't working, but now I see that even broadcast FM isn't showing a bump in the spectrum:
I can play broadcast fm radio stations (the ones playing ...
- 241
2
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0
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280
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Why the Receiver Sensitivity theoretical value doesn't match its experimental value when using USRP B200mini in GNU Radio?
I'm using a USRP B200mini SDR card for my GNU Radio energy detector project. I wanted to measure its Receiver Sensitivity ($RS$) experimentally and compare the experimental value to the theoretical ...
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3
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What can be used to protect an SDR receiver against bursts?
I am using a USRP B205 to detect electromagnetic pulses. Sometimes the signal power bursts to 100 dB, average power is around 10 dB. What can be used to protect the SDR receiver against bursts?
- 650
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What's the negative float of rtl_power output means?
I got below float numbers after soapy_power -f 80M:100M -B 1000 --output a --format rtl_power:
...
- 650
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242
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AM radio cross-talk / hearing strong station everywhere
I've built the M0AYF active loop antenna for my RTL-SDR, using BC847C for the amplifier transistors.
There are a couple very strong AM stations here, usually playing music. What I'm noticing is that ...
- 145
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2
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What's the difference between LPF and BPF in context of bandwidth setting?
I'm used to simple RX/TX bandwidth configurations, on my VHF FM rig it's either narrow, normal, or wide. It seems to be much more complex on my new HF SDR rig, and the instructions don't say anything ...
- 411
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4
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Why am I hearing FM radio show content on 1.355 MHz? (Using CubicSDR and SDR kit)
I am just beginning to learn about SDR. I purchased a "NooElec NESDR Mini 2 SDR & DVB-T USB Stick (RTL2832 + R820T2) with Antenna and Remote Control"
I plugged it into my Mac, downloaded ...
- 161
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7
answers
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Why is 20m band waterfall showing signals every 50 kHz?
I'm very new to shortwave listening and just got to grips with my RTL SDR HF dongle. Last night while on the 20m band, there were signals exactly every 50kHz, starting exactly at 14.000MHz, then at 14....
- 411
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1
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USRP-B210 GPSDO will not lock
Hi I own a B210 and I have a GPSDO that's installed but I do not have the antenna yet. Can I use it as a 10MHz reference and PPS until I obtain the antenna?
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