Tried SDR?

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Re: Tried SDR?

Postby G4RMT » Fri Jul 14, 2017 7:35 pm

I have 3 dongles - they all seem to drift - and to get accurate frequencies, offsets have to be applied - sometimes randomly. This morning, it needed a plus 15 in the box to be on frequency on UHF, but after a computer restart this afternoon - 15 was not enough - 28 to get the thing locked on again. Any idea why this is - Odd things happen too with the display vs gain - a display that has the noise floor at the bottom, and a peak from mega strong signals just below the top - becomes different on a reboot - this time the noise floor has vanished off the bottom. With tweaking you can restore it - but it's a pain.
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Re: Tried SDR?

Postby deadite66 » Sat Jul 15, 2017 9:58 am

most of these dongles were designed for DVB-T, they tend to drift as they warm up.
the rtlsdr v3 dongle has a temperature compensated oscillator (TCXO) so shouldn't drift much.
Airspy R2 on a Marine tuned dipole (Rocket Radio MARI-1)
24/7 Marine recording with RTLSDR_Airband
SDRPlay RSP2 Pro on a Discone
Yupiteru MVT-9000 MKII telescopic ant.
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Re: Tried SDR?

Postby Scan125 » Sat Jul 15, 2017 11:18 am

Another big advantage of quality traditional hardware receivers with SDR capability is frequency stability. My Alinco DX-R8 has it's frequency stability based around a temperature controlled oven and frequency stability is +/- 1ppm. An ICOM IC-R9500 is +/- 0.05ppm :shocker:
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Re: Tried SDR?

Postby lhuchison » Mon Jul 17, 2017 6:22 pm

Could never afford one but I wonder when the icom 8600 is due for release in the uk? Theres an option to put a deposit down on most of the uk suppliers but still no word on release dates.
Id love one if I had that sort of spare cash or credit card? laying about!
Icom IC-R8600 + SDRplay + Diamond discone
Icom sp-20 . 10 meter long wire . 9-1 balun, Howes CTU9 ATU
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Re: Tried SDR?

Postby royjcropper » Thu Oct 04, 2018 6:09 pm

Sorry to resurrect an old thread but I'm really interested in deadtite66's Raspberry Pi2/RTL-Airband setup.

That would be perfect for me if I could get it working.
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Re: Tried SDR?

Postby radiostationx » Thu Oct 04, 2018 8:39 pm

hi deadite66,
tried rtlsdr-airband, got it going easy on my pi chugging away scanning albeit 2 mb bandwidth but could not set up audio server on windows pc to monitor output of remote pi
jumped through a lot of hoops, for the listening/ monitoring side the program seems to be set up for linux distros not windows.
did you get it going using headless pi & windows remote listening over wlan ?
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Re: Tried SDR?

Postby deadite66 » Fri Oct 05, 2018 8:27 am

i don't listen live, i record to mp3 and playback over samba.
i used to run it headless on a pi2 and admin over ssh but these days i run it on a laptop as i use an Airspy R2 now.
Airspy R2 on a Marine tuned dipole (Rocket Radio MARI-1)
24/7 Marine recording with RTLSDR_Airband
SDRPlay RSP2 Pro on a Discone
Yupiteru MVT-9000 MKII telescopic ant.
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Re: Tried SDR?

Postby royjcropper » Fri Oct 05, 2018 6:21 pm

Deadite66, are you still able to record multiple marine channels 24/7 using the Airspy and a laptop?
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Re: Tried SDR?

Postby radiostationx » Fri Oct 05, 2018 7:24 pm

Another one for deadite66 please,
I see you have Airspy R2 and SDRplay rsp2, I am considering these at the moment, the rsp2 has option for 3 antennas with no additional external upconverter.
I already own a spyverter.
Software aside, I would be interested to know the performance comparison on VHF air especially with both units.
How do they compare with Yupi -9000 a "real" radio ?
Thanks in advance.
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Re: Tried SDR?

Postby deadite66 » Fri Oct 05, 2018 8:13 pm

@royjcropper yup, still using rtl_airband as it has soapysdr support now, still use it was i would the pi2. the arm boards don't have great usb bandwidth and stability so i had move to a laptop.
i was using cubicsdr for a while to record each channel but it the interface starts to badly slow down after some hours.

@radiostationx hard to know for sure without having them running side by side but i'm pretty sure the R2 has better SNR over the rsp2.
i have the aerials and SDR's in the attic and use a 10 meter usb3 active cable to maximize signal so can't compare it against the Yupi.
Airspy R2 on a Marine tuned dipole (Rocket Radio MARI-1)
24/7 Marine recording with RTLSDR_Airband
SDRPlay RSP2 Pro on a Discone
Yupiteru MVT-9000 MKII telescopic ant.
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