Search found 213 matches

by snn47
Mon Dec 23, 2019 6:52 am
Forum: Antennas
Topic: DIY suggestions for 120-130Mhz AM
Replies: 2
Views: 1506

Re: DIY suggestions for 120-130Mhz AM

Are you on the top floor or do you have another balcony above you? If yes this will significantly influence antenna pattern and I would opt for a 1/4 wave ground plane with thick tubing to increase bandwidth. Any antenna with higher gain will limit the width of your antennas elevation lobe, since ga...
by snn47
Thu Dec 05, 2019 4:49 am
Forum: RTL-SDR Discussion
Topic: Newbie : listening 3Khz to 148 Khz with upconverter ?
Replies: 8
Views: 1473

listening 3Khz to 148 Khz with upconverter ?

Yes, If the upconverter is not limited by a High-Pass and really passes all signals received to the mixer and provides an upconversion. You can verify receptions using one of themany strong time reference signals closest to you, e.g. DCF-77 on 77.5 kHz in Mainflingen Germany, which are used e.g. by ...
by snn47
Wed Dec 04, 2019 7:21 am
Forum: Other SDR Devices
Topic: SDRplay announces the RSPdx
Replies: 8
Views: 2777

Re: SDRplay announces the RSPdx

@radiolistener For example, here is comparison between SDRPlay and RTLSDR on short wave, both connected to the same antenna and working simultaneously. Do you see any advantage of SDRPlay against RTLSDR? I don't. ;) It is diffuicult comparing pictures, but looking at the sidebands and the two signal...
by snn47
Wed Dec 04, 2019 6:57 am
Forum: Other SDR Devices
Topic: SDRplay announces the RSPdx
Replies: 8
Views: 2777

Re: SDRplay announces the RSPdx

In this discussion receiver performance and the point where an antenna and/or cable are connected to the receiver need to be seen seperately. PS: These comments are no tintended to discourage anyone, but I am trying to point out that at such low frequencies, you can only try to find the best comprom...
by snn47
Sat Nov 30, 2019 10:53 am
Forum: RTL-SDR Discussion
Topic: maximum transmision range.
Replies: 3
Views: 742

Re: maximum transmision range.

1 NM = 1.852 km

179 NM ~330 km
by snn47
Fri Nov 29, 2019 11:32 pm
Forum: RTL-SDR Discussion
Topic: maximum transmision range.
Replies: 3
Views: 742

Re: maximum transmision range.

The theoretical Radio Line of sight (RLOS) is ~ 1.23 * (SQRT 2000ft +SQRT 10000ft) ~178 NM. No one will be able to give you a reliable estimate for the actual achieveable range since there are many factors to consider, e.g. antenna gain and variation of real lobed antenna pattern, the difference bet...
by snn47
Sat Nov 23, 2019 10:52 am
Forum: RTL-SDR Discussion
Topic: Direction Finding brainstorm- log spectrum via Doppler antenna system?
Replies: 1
Views: 414

Re: Direction Finding brainstorm- log spectrum via Doppler antenna system?

Is your Doppler antenna b asis really large enough to get an audible tone?
by snn47
Sun Nov 17, 2019 11:51 am
Forum: Antennas
Topic: FM antenna
Replies: 9
Views: 2801

Re: FM antenna

In the past such Yagi Antenna was used in Europe: https://www.radiomuseum.org/r/rim_16_element_bereichs_yagi_uda_antenne_80371.html Often the can see nower days but the get not connected any more. Have you also read the the designated use of this antenna is Fernsehempfang which is TV-BC, but not FM...
by snn47
Sun Nov 17, 2019 11:47 am
Forum: RTL-SDR Discussion
Topic: OTA on DVB-C with RTL-SDR
Replies: 12
Views: 1667

Re: OTA on DVB-C with RTL-SDR

Username wrote:
Sun Nov 17, 2019 10:24 am
If they are encrypted than you need also a way to decrypt the signals
The are that good Encrypt you will never decrypt them.
Currently maybee, but even unbreakable encryptions (since Enigma) have always been broken if there was an interest in dooing so.
by snn47
Sun Nov 17, 2019 10:42 am
Forum: Antennas
Topic: FM antenna
Replies: 9
Views: 2801

Re: FM antenna

Looking at the link I am confused to find mainly recommendations for horizontally polarized antennas for FM-BC. Only TV-BC antenna use to my knowledge horizontal polarization. Passive car antennas for FM-BC have been by design vertically, until preamplifier were cheapenough to shorten antenna. In Eu...