Search found 223 matches

by snn47
Mon Sep 11, 2017 4:34 am
Forum: Antennas
Topic: Basic Questions About Antenna Set-Up for Shortwave
Replies: 3
Views: 6228

Re: Basic Questions About Antenna Set-Up for Shortwave

For a vertical antenna setup for reception only yes. You have to keep in mind that like most antenna this ground plane is not broadband, but at SW a few hundred kHz at best, if used as transmitt antenna and this is what this design is for. Since you want to receive, a wide range use, cut the wire fo...
by snn47
Mon Sep 11, 2017 4:20 am
Forum: Other SDR Devices
Topic: AD-FMCOMMS3-EBZ - AD9361 Wideband SDR Evaluation Board $790
Replies: 0
Views: 3356

AD-FMCOMMS3-EBZ - AD9361 Wideband SDR Evaluation Board $790

The Evaluation board http://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/EVAL-AD-FMCOMMS3-EBZ.html#eb-overview The AD9361 http://www.mouser.com/ds/2/609/AD9361-588050.pdf RF 2 × 2 transceiver with integrated 12-bit DACs and ADCs TX band: 47 MHz to 6.0 GHz R...
by snn47
Fri Sep 01, 2017 12:35 am
Forum: Antennas
Topic: Basic Questions About Antenna Set-Up for Shortwave
Replies: 3
Views: 6228

Re: Basic Questions About Antenna Set-Up for Shortwave

It depends on what type of stations you want to receive, the antenna polarization and radiated power used, distance and direction to your location, what type of antenna is optimal for your needs. If signals are strong even a few meter of cooper wire from an old transformer should work well enough wi...
by snn47
Mon Aug 07, 2017 8:50 pm
Forum: RTL-SDR Discussion
Topic: raspberry pi 2 make a lot of noise
Replies: 4
Views: 5750

shielded (conductive) case + filters for raspi

Thats why comercially sold computer are required to have a shielded case, or add shield to and/or filter to components and output that produce the most Radio Frequency Interference (RFI) to reduce RFI to certain value. All connector require ground which has to be grounded at all points to conductive...
by snn47
Sat Aug 05, 2017 1:26 pm
Forum: RTL-SDR Discussion
Topic: recommended Splitter w/ BIAS-T DC Pass-through on one port?
Replies: 3
Views: 4864

Re: recommended Splitter w/ BIAS-T DC Pass-through on one po

From your picture it should have only a power path on the right port which is supported by this description I found here http://www.ebay.de/itm/20-2-Way-Coax-Splitter-Holland-HFS-2-5-2150Mhz-Dish-Network-2way-1x2-Coaxial/112433875153?_trksid=p2047675.c100623.m-1&_trkparms=aid%3D222007%26algo%3DSIM.M...
by snn47
Sat Aug 05, 2017 1:07 pm
Forum: User Projects
Topic: Laptop Mount SDR Project...
Replies: 2
Views: 5286

Re: Laptop Mount SDR Project...

Did you consider that you will get more RFI from your notebook the closer your SDR/antenna is to the notebook. RFI will vary with notebook and frequency you want to receive While it is convinient to have a mount for your SDR with antenna connected, it will depend a lot on how well "shielded" your no...
by snn47
Sat Aug 05, 2017 12:58 pm
Forum: Antennas
Topic: ESD Protection
Replies: 3
Views: 5638

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: 7118

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: 7118

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: 3902

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