Архив за 19.08.2017

looking for meteor M2 map overlay program

I have seen a really good one being used "meteorGIS" But the links are now dead www.zetofzone.com/freewares.

Does anyone have or know of something that can put a world map over the images?

submitted by /u/Moon_misery
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Comment on ADALM-PLUTO SDR Hack: Tune 70 MHz to 6 GHz and GQRX Install by Beer It

I fully agree (page 2) https://www.xilinx.com/support/documentation/data_sheets/ds190-Zynq-7000-Overview.pdf

My only guess is that it is done to reduce cooling requirements, and/or to reduce EMI.

Comment on ADALM-PLUTO SDR Hack: Tune 70 MHz to 6 GHz and GQRX Install by Tim

2 things I can think of.
Make sure you click the no_limit button on gqrx.
2nd thing was when I originally did the hack, I left the ” ad9364″ quotes marks in …..remove the quotes.

gnuradio will work, but I only installed using pybombs. The is an edit to the recipe found in reddit for plutosdr.

I can’t gqrx to work correctly myself yet….show gqrx v 2.7 with plutosdr in title bar and in uri, but RTL-SDR is grabbing the device instead of pluto. I can see it control rtl2832 when changing frequencies

Comment on ADALM-PLUTO SDR Hack: Tune 70 MHz to 6 GHz and GQRX Install by lonelysurfer

Strange. You can try to undo the changes with (ref. : http://manpages.ubuntu.com/manpages/trusty/man8/fw_setenv.8.html) :
fw_setenv attr_name
fw_setenv attr_val
pluto_reboot reset

Обратите внимание, крайне интересная конструкция! Конвертер 1700 МГц -> 137 МГц…

Making the converter for recieving weather high resolution images
Обратите внимание, крайне интересная конструкция! Конвертер 1700 МГц -> 137 МГц с низким уровнем собственного шума. Автор - Radek Vaclavik, OK2XDX.
http://hobitus.com/en/research/high_res/converter/

Comment on ADALM-PLUTO SDR Hack: Tune 70 MHz to 6 GHz and GQRX Install by rlwsdr

Select “No Limits” on the GCRX Input Control.
http://gqrx.dk/doc/practical-tricks-and-tips

Also give the ADI IIOScope program a try under Windows.

RTL-SDR Discussion • SDR# scanner plugin

Hi,

I'm looking plugin for SDR# that can scan list of predefined frequencies. I didn't have any luck so far, so i hope you can point me the right way.
I'm using rtlssdr usb dongle....

Statistics: Posted by besomuk — Sat Aug 19, 2017 6:52 pm


RTL-SDR Discussion • Signal Level Question

I am attempting to make sense of several different readings from my RTL-SDR.

I have the RTL-SDR connected to a 50 ohm load. Removing the load, leaving the RF input disconnected increases the base level by some 0.2 dB. Seems strange.

I can not correlate the levels seen by SDR# and rtl_sdr or python applications.

I calculate power from i-q as
db_level = 10*log10( (i^2 + q^2) / 100 ).
dbm_level = 10*log10( 10 * (i^2 + q^2) ).

I think the mean value of this calculation should be close to the value seen by SDR#. It is not.

Data collected by rtl_sdr from librtlsdr tools
##/tmp/rtl_sdr.bin -63.218705 dB
##/tmp/rtl_sdr.bin -33.218705 dBm
##/tmp/rtl_sdr.bin -45.726986 psd dB

Data collected with pyrtlsdr functions
##/tmp/sdr_collect.bin -64.747267 dB
##/tmp/sdr_collect.bin -34.747267 dBm
##/tmp/sdr_collect.bin -48.284199 psd dB

Data observed in SDR#
## sdr# gain 49.6 dB AGC off 1.420 GHz
## 1.420 GHz peak -54.8 dB
## floor -55.4 dB
## SNR 1.5 dB
## Signal Diagnostics
## full iq
## ref 0.0 dB
## Amplitude -43.1 dB

Since the rtl_sdr and pyrtlsdr data sets were collected at different times, the values are considered equal.

Both these values differ from that observed with SDR#.

What am I doing wrong???

Tom Dean

Statistics: Posted by tomdean — Sat Aug 19, 2017 6:43 pm


Comment on ADALM-PLUTO SDR Hack: Tune 70 MHz to 6 GHz and GQRX Install by Val

hm, it looks like they are using dual-core CPU, but only enable one core

Comment on ADALM-PLUTO SDR Hack: Tune 70 MHz to 6 GHz and GQRX Install by Val

It’s understandable that chip is not guaranteed to work out of it’s specs. As I understand it worked for some people, but not for everyone. For instance, someone claimed it went up to 4.4 GHz after the hack, but not further.

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