Search found 47 matches

by DK7OB
Sun Apr 24, 2016 3:56 pm
Forum: General
Topic: sdrplay with Kubuntu 16.04
Replies: 6
Views: 2214

sdrplay with Kubuntu 16.04

Hello, today I installed the new Kubuntu 16.04. I installed the SDRplay API and rebuilt all my libraries and qgrx from source. When I start gqrx, it finds the sdrPlay but during initialization the laptop locks hard, I have to press the power button for >5 seconds to recover. Cubicsdr gives same resu...
by DK7OB
Mon Apr 04, 2016 2:06 pm
Forum: SDRplay related
Topic: ADC Setpoint not working
Replies: 4
Views: 1923

Re: ADC Setpoint not working

I did some more detailed investigations regarding setting the gain reductions. Setup: SDRplay connected to Rohde und Schwarz Signal generator SML, frequency 25MHz, level -80dBm. gqrx with SoapySDRPlay driver from git master and latest SDRplay API on Kubuntu 14.04. Observation: When the LNA threshold...
by DK7OB
Sat Apr 02, 2016 10:32 am
Forum: SDRplay related
Topic: ADC Setpoint not working
Replies: 4
Views: 1923

Re: ADC Setpoint not working

David, thanks for your reply. The name of the API installer is SDRplay_RSP_MiricsAPI-1.9.4.run, and the Web page says "Includes API 1.8.1", but what I see is exactly what you write. The gain jumps around 20dB or so (at least the noise floor jumps that way). This is with the "soapy&quo...
by DK7OB
Fri Apr 01, 2016 8:35 am
Forum: SDRplay related
Topic: ADC Setpoint not working
Replies: 4
Views: 1923

Re: ADC Setpoint not working

I have the same or a similar issue. Running gqrx with soapy-sdrplay on Kubuntu 14.04. All software built from latest git. In gqrx I get the gain sliders TUNER and LNAT. The TUNER slider more or less works as expected, but sometimes the noise floor jumps about 20dB when moving the TUNER slider. This ...
by DK7OB
Thu Mar 31, 2016 7:33 am
Forum: General
Topic: 20 Meter Opening
Replies: 2
Views: 1395

Re: 20 Meter Opening

I saw that yesterday night. I think it was FT4JA, very rare and only on air since one day or so. I heard them this morning on 17m. VK0EK was on air as well. FT4JA pulled all the big stations away from him so I could get him myself finally. You see the difference in the attached screen shot. VK0EK (n...
by DK7OB
Tue Mar 29, 2016 2:59 pm
Forum: General
Topic: Possible bug in Linux sdrplay API
Replies: 2
Views: 1055

Re: Possible bug in Linux sdrplay API

I have verified in the code that the frequency is correctly set in MHz when mir_sdr_init is called and in Hz when the call to mir_sdr_SetRf is used. Unfortunately I have no old logs, and right now gqrx is not running with gr-osmosdr any more. I get lots of USB overflow errors and choppy audio. It is...
by DK7OB
Fri Mar 25, 2016 12:15 pm
Forum: General
Topic: Possible bug in Linux sdrplay API
Replies: 2
Views: 1055

Possible bug in Linux sdrplay API

Hello, while playing with gqrx and SDRPlay with the osmosdr backend, I found that changing the frequency only works when the frequency step is > 10 kHz. Smaller steps have no effect at all. I traced it down to this code in gr_osmosdr sdrplay_source_c::set_center_freq(): if (fabs(diff) < 10000.0) { s...

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