Search found 223 matches

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: 4646

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: 4646

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: 4443

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: 7604

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: 5361

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: 13382

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...
by snn47
Sun May 21, 2017 7:36 am
Forum: Off-Topic
Topic: O.T. Icom IC27A 2 meter mobile rig fixup (Resolved!)
Replies: 3
Views: 5361

Re: O.T. Icom IC27A 2 meter mobile rig fixup and BNC connect

If you have accesss to a Standing Wave Ratio meter use a 1/2 wave coax to meassure the reflections. Both cable and SWR have to have the same impedance as your TRx output connector. You did not show a picture of the gap you ask about. Do you refer to a PL-type antenna connector (PL-259 also called UH...
by snn47
Thu May 18, 2017 8:13 am
Forum: Antennas
Topic: Antenna on the roof or in the attic ?
Replies: 14
Views: 17484

Discone antenna work very well on short wave!

Discone antenna work very well on short wave! however I wonder if you could fit it into your attic, since it will have to have much larger dimensions than yours to work on short wave :twisted: . Over at QRZ forums you will get some idea from this thread http://forums.qrz.com/index.php?threads/discon...
by snn47
Mon May 15, 2017 2:17 pm
Forum: Antennas
Topic: Antenna on the roof or in the attic ?
Replies: 14
Views: 17484

Coax for Antenna on the roof or in the attic ?

Check the HAM Bands and you should get a lot of conversations. For cable you should check for - do you have many strong (local) that you have consider for very good shielding - you don't necessarily the ones written above there may be other coax-types (cellflex, flexwell) with similar/better specs a...
by snn47
Sun May 14, 2017 4:10 am
Forum: Antennas
Topic: Antenna on the roof or in the attic ?
Replies: 14
Views: 17484

Re: Antenna on the roof or in the attic ?

Was Kenn correct you want to primarily receive ADSB, or is your interest more in terrestrial signals? If it is ADSB a Q&D (Quick and Dirty design) using a small 1/4 wave ground plane on a ~5 m fiberglass fisching rod or 2 by 4 piece of wood, is easier to set up and secure e.g. on a balcony, than a l...