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Software Defined Radio

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N0OUW's picture
N0OUW
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Joined: Wednesday, April 21, 2010 - 22:57
Software Defined Radio

Leonard Leeper (KC0WOX) mentioned a website he discovered recently concerning the use of Software Defined Radios that stream their radios to the web for our listening enjoyment.

I will leave it to Leonard to fill us in on what he has learned about the site. Click Here to check it out for yourself.

KC0WOX
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Joined: Thursday, September 6, 2007 - 17:35
Software Defined Radio kits

A really good way to get started in SDR is with a softrock kit. They are available form http://www.kb9yig.com/ They sell out fast and he restocks about every week or so. I reccomenr:

SoftRock RX Ensemble II Receiver Kit $56.00 each

The SoftRock RX Ensemble II Receiver Kit includes the components for building the kit for LF, 180kHz through 3.0 MHz, operation or for HF, 1.8 MHz through 30 MHz operation. A second 74AC74 position provided on the circuit board gives an additional division by 4 on the Si570 clock signal for LF operation. For HF operation the second 74AC74 is not mounted on the board and an HF jumper is installed to route the Si570 clock signal directly to the 74AC74 that is used for quadrature clock generation

The manual for it can be found at http://www.wb5rvz.com/sdr/ensemble_rx_ii/

If you would like to try out SDR, go to http://www.websdr.org/ and select a receiver site. You can then tune the radio just as if it was your receiver running on your computer.

Leonard
kc0wox

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KE0WTC
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Joined: Wednesday, October 25, 2017 - 21:01
Any interest in some kind of SDR experience sharing event?

Don’t know how I managed two msgs.  Please delete this one

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KE0WTC
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Joined: Wednesday, October 25, 2017 - 21:01
Any interest in some kind of SDR experience sharing event?

got my rtl-sdr v3 dongle about three weeks ago and am learning a lot.  Have received 2 meter, 70 cm,  police and aircraft, along with some tones on other bands.  Lots to learn here.  

I am wondering if anyone else is trying to come up to speed with sdr, and if so, perhaps a sharing event some evening or weekend would be of interest?

Or, perhaps just a discussion here though the forums don’t appear to get much activity.

Tom

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DarrylN
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Joined: Sunday, March 25, 2018 - 07:47
Airspy HF+ and gqrx

I just got an Airspy HF+ SDR.  Using it with gqrx software on Linux. Airspy HF+ uses a a polyphase harmonic rejection mixer.  Interesting stuff!

Specs:

  • -141.0 dBm (0.02 µV / 50 ohms) MDS Typ. at 500Hz bandwidth in HF
  • -141.5 dBm MDS Typ. at 500Hz bandwidth in FM Broadcast Band (60 – 108 MHz)
  • -139.5 dBm MDS Typ. at 500Hz bandwidth in VHF Aviation Band (118 – 136 MHz)
  • -139 dBm MDS Typ. at 500Hz bandwidth in VHF Commercial Band (136 – 174 MHz)
  • -138 dBm MDS Typ. at 500Hz bandwidth in the upper VHF Band (> 174 MHz)
  • +26 dBm IIP3 on HF at maximum gain
  • +13 dBm IIP3 on VHF at maximum gain
  • 110 dB blocking dynamic range in HF
  • 95 dB blocking dynamic range in VHF

https://airspy.com/airspy-hf-plus/

http://gqrx.dk/

 

 

 

 

 

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DarrylN
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Joined: Sunday, March 25, 2018 - 07:47
Airspy HF+ and gqrx

 

Airspy HF+ block diagram

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DarrylN
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Joined: Sunday, March 25, 2018 - 07:47
WebSDR
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