Search found 197 matches

by snn47
Sat Aug 05, 2017 12:58 pm
Forum: Antennas
Topic: ESD Protection
Replies: 3
Views: 4310

ESD vs. lightning protection for long wire ant.

Spark vs. lightning strike differ in duration and the amount of energy contained While Lightning is deadly, ESD is mostly not to humans, and only to sensitive electronics. You will have to read up a bit to understand and decide what you need. Therefor there is imho no easy answer and will depend on ...
by snn47
Sun Jul 30, 2017 3:13 am
Forum: Other SDR Devices
Topic: Linear Amp for Raspberry Pi 2 GPIO transmitter?
Replies: 4
Views: 5645

Questionable if wideband Lin-Amp for RaspPi 2 GPIO can be us

The main problem is that the GBIO output produces a wideband noise. Even with liscence it is not just the harmonicics that need to attunated, but also widebadn noise. The author only provided pictures using 100 MHz wide frequency range scan, so I wonder how bad the signal really is close up. I remem...
by snn47
Wed Jul 19, 2017 3:36 pm
Forum: Other SDR Devices
Topic: Linear Amp for Raspberry Pi 2 GPIO transmitter?
Replies: 4
Views: 5645

you need also a filter and a liscense to radiate

Just two question did you consider that you need a liscence for the signal type and frequency you want to radiate 20 W at, and did you consider that you also need filters, in order to attenuate harmonics of your signal sufficiently and to to keep spurious radiation of the signal narrow? If not infor...
by snn47
Tue Jun 20, 2017 5:47 pm
Forum: RTL-SDR Discussion
Topic: dsd
Replies: 2
Views: 3055

Re: dsd

en anglais s'il vous plaît ;)
https://translate.google.com/#en/fr/English%20please

Google translate helps both ways :roll:

Hello I am from Rouen I have sdr dsdplus 2.32 apart from the DMR I do not decode anything, could someone help me to configure it
by snn47
Tue Jun 20, 2017 4:34 am
Forum: RTL-SDR Discussion
Topic: Which program supports display of pulse-amplitude vs. time
Replies: 3
Views: 3611

Re: Which program supports display of pulse-amplitude vs. ti

You can just record the audio into Audacity, and see the waveform there.
Are you sure Audacity or other audio programs can process/display e.g. short Mode S pulses?

The pulse width is 0.5 µs @50% amplitude points or 2 MHz, while the pulse rise-/decay-time is defined to be <0.05µs.
by snn47
Sat Jun 17, 2017 8:26 pm
Forum: RTL-SDR Discussion
Topic: Which program supports display of pulse-amplitude vs. time
Replies: 3
Views: 3611

Which program supports display of pulse-amplitude vs. time

Does anyone know of a program that allows to display pulses or short signal bursts (e.g. long/short Mode S) as signal amplitude over time (or time domain) as shown in the picture? PS.: I saw the plugin for Gnu Plot but I couldn't get mysel to start reading up on GnuPlot http://www.rtl-sdr.com/forum/...
by snn47
Sun Jun 04, 2017 5:52 pm
Forum: Off-Topic
Topic: KA Band Sat?
Replies: 2
Views: 3276

Re: KA Band Sat?

Hi I am from Europa and want to get into the KA Band. I read on a German Website here is no "Wideband" LNB at the moment. I found some on Ebay but I dont know how Widebanig the are. Do I need an special Dish? You need to consider that the focal point (F/D) of any dish depends on it's shape and will ...
by snn47
Sun Jun 04, 2017 5:42 pm
Forum: Off-Topic
Topic: Convert 24 bit ICAO adr to flight ID, like 4ca4ec to RYR82SN
Replies: 3
Views: 5664

Some Mode S 24 bit adress background

The idea for the 24 Bit address was to assign each airframe an unique 24 Bit aircraft address for life. The legacy SSR Mode A allowed only for 4096 addresses "Squawks" (4 octal numbers each 3 Bits) and required change of the Squawk during a flight, whenever the plane was handed over from one ATC con...
by snn47
Mon May 22, 2017 11:53 pm
Forum: Off-Topic
Topic: O.T. Icom IC27A 2 meter mobile rig fixup (Resolved!)
Replies: 3
Views: 4183

Re: O.T. Icom IC27A 2 meter mobile rig fixup (Resolved!)

Congratulationfor solving your problem, however I am surprised that you have no voltage drop during transmitt. Personally I do not crimp any connector used for transmitt purposes nor use any form that jist presses connections with higher current. There are lighter plug that that allow to tighten the...
by snn47
Mon May 22, 2017 2:19 am
Forum: Troubleshooting Help
Topic: RTL-SDR Dongle V3 knocking out Wireless Networks
Replies: 15
Views: 10285

Re: RTL-SDR Dongle V3 knocking out Wireless Networks

Which frequencies are the wireless networks affected operate on and how far away from you were they affecte. Do you use an additional LNA or do or your neighbours have an active TV amplifier left over from terrestrial reception times, use a portable TV antenna with built in amplifier (rabbit ears an...