Discussion in 'Software Defined Radio (SDR)' started by KN4SLJ, Oct 25, 2020.
I was just trying to provide a possible explanation for why he has all the spurs.
My hdsdr is ok, if the if gain is not pushed up high.
I use it for the recording feature, the ability to record 200 khz of the band at a time. Fantastic.
Actually in addition to the many inexpensive dongles out there I've also had a HackRFOne since it covers up to 6 Gigs. You can use SDR# software too. My favorite at the moment is the one attached.
I sing the praises of the cheap RTL-SDR v3 dongles - as many have already said here the key is avoiding overload from strong signals, most commonly AM/FM broadcast. I have several of them running as remote receivers, at three different locations. My favorite software for listening used to be HDSDR, but more recently I have come to appreciate the sheer power of SDR# and the assorted plugins that work with it.
For remote listening to the dongles I use the Spyserver program, which comes with the SDR# installation package...it's a hidden treasure. And what is incredible is the low upstream bandwidth needed for Spyserver to work. Except for broadcast (wideband) FM, even 0.5 megabits upstream is plenty to feed the SDR# program remotely, to sit there and watch the waterfall and select signals to listen too. I've had no problem decoding FT8/WSPR signals via the remote audio Spyserver sends from the dongles.
If you have an iPhone or iPad, an RTL-SDR, plus a Raspberry Pi (or other linux server), you can use rtl_tcp plus this iOS app to listen to your RTL-SDR: https://apps.apple.com/us/app/rtl-tcp-sdr/id1351164646?ls=1
(Disclaimer: I'm the developer of this rtl_tcp SDR app. http://www.hotpaw.com/rhn/hotpaw/)
SDR-Console will let you record 10 Mhz of the band at a time with an RSP1A. That's assuming, of course, that your PC is capable of handling data rates that high.
An RTL-SDR can be used with the rtl_sdr command-line utility to record nearly 3 MHz of contiguous spectrum.
A Hermes Lite 2 SDR plus Spark SDR can allow one to skim 4 to 9 separate HF bands simultaneously (with custom FPGA gateware, and, again, assuming your computing equipment is powerful enough). The Hermes Lite 2 SDR might cost about twice as much as an SDRPlay RSPxx unit, but it's also a full QRP transceiver capable of being operated remotely over your network.
Simultaneous receiving on multiple bands may also be possible with certain Anan and Flex rigs, but at a significantly higher cost than either the SDRPlay or HL2 units.
How about Android ?
You can connect an RTL-SDR dongle directly to an Android phone using an OTG (on the go) cable.
RF Analyzer and SDRtouch will both work for receiving porpoises. Be aware that the dongle draws a fair bit of current so battery life can be an issue.
The RX-888 SDR receiver has a bandwidth of 32 MHz and SDR Console will record up to perhaps 28 MHz of that assuming you have a PC that can handle the load (one of the biggest issues is write speed to disk. You need a fast SSD to sustain the maximum rate.)