Search found 213 matches

by snn47
Sun Nov 17, 2019 10:18 am
Forum: RTL-SDR Discussion
Topic: distorted FM
Replies: 12
Views: 1767

Re: distorted FM

Do you also have CATV/CATV in your room, than it might not be reflections/multipath but leackage from you cable system Could it be also intermodulation, did you try lower high gain setting or reducing receive signal e.g. by holding the antenna radiatior in your hand? Did you try it from somewhere el...
by snn47
Sun Nov 17, 2019 10:09 am
Forum: RTL-SDR Discussion
Topic: OTA on DVB-C with RTL-SDR
Replies: 12
Views: 1610

DVB-C or DVB-C2, encrypted or free?

@y0r -Do you have DVB-C or DVB-C2? -Did you check if your DVB-C signals are encrypted? If they are encrypted than you need also a way to decrypt the signals General questions out of curiosity: - Are DVB-C(2) modulation parameter the same all over the world, or do they differ from region to region or...
by snn47
Sun Nov 17, 2019 9:19 am
Forum: Antennas
Topic: Looking for recommendations for mobile, wide band, rx only antennas.
Replies: 2
Views: 1228

Re: Looking for recommendations for mobile, wide band, rx only antennas.

Short answer: Since you don't transmit, any wire of ~10 cm should receive well enough for you at the 1/4 mile you quoted. To have a truly wideband monopole antenna would require either the use of e.g. a Blade antenna e.g. CI-285 https://ab5d1ff47e2dcf84bb59-cd58ea74bce75265c2d3567bdc9977e9.ssl.cf2.r...
by snn47
Sun Nov 10, 2019 10:55 am
Forum: Antennas
Topic: Beginner HF/shortwave Antenna Recommendations?
Replies: 6
Views: 2387

Re: Beginner HF/shortwave Antenna Recommendations?

I disagree too, magnetic antennas work also well indoor. There are two types of magnetic antennas: 1.untuned loops of one or more windings with or without ferrite core and 2. tuned single Loop with a circu mference of<1/4 Lambda for the highest frequency to be transmitted/ received loop type 2 works...
by snn47
Tue Oct 15, 2019 6:42 pm
Forum: Antennas
Topic: 1090 Antenna for Onbord use?
Replies: 2
Views: 1231

Re: 1090 Antenna for Onbord use?

Fake, you will receive but not have the advertised gain. Gain depends on the antenna design but there are no miracles and gain requires certain physical dimsions. The first antenna is supposed to have "10 dBi" while the second antenna is supposed to have "7 dBi", but both have the same physical leng...
by snn47
Tue Oct 15, 2019 8:24 am
Forum: RTL-SDR Discussion
Topic: Dedicated laptop
Replies: 4
Views: 769

Re: Dedicated laptop

I forgot for the professional I own I could also download the service manuals. I also like the docking stations the older ones still provide leagcy interface support missing in todays PC. It is a shame that HP does not offer decent displays anymore except for the most expensive versions. All my HP W...
by snn47
Mon Oct 14, 2019 6:35 pm
Forum: RTL-SDR Discussion
Topic: Power consumption
Replies: 2
Views: 610

Re: Power consumption

Dongle power consumption vary between dongles, but should stay below the USB 2 specs of 5V and 0.5 A.
by snn47
Mon Oct 14, 2019 6:32 pm
Forum: RTL-SDR Discussion
Topic: Dedicated laptop
Replies: 4
Views: 769

Re: Dedicated laptop

Personally I liked professional HP notebooks (e.g. all of mine still work 69xx, 84xx and 2 zBooks) and only recently when their their displays quality got bad incl. brighness I choose Lenovo. You can still get allof them them refurbished and if you do not need internet access they work weel with XP ...
by snn47
Mon Oct 14, 2019 1:07 pm
Forum: RTL-SDR Discussion
Topic: More on Showing wave form on an oscilloscope.
Replies: 8
Views: 1192

Re: More on Showing wave form on an oscilloscope.

IF-Output this question is easy to answer: Before SDR were becoming reasonably priced, almost all receiver used conversion of the RF signal to a lower Intermediate Frequencies (IF’s). IF receiver were standard, whenever amplification of weak signals with reasonably noise figures and use of (very) na...
by snn47
Sat Oct 12, 2019 7:06 pm
Forum: Antennas
Topic: Antenna location question
Replies: 5
Views: 2136

Re: Antenna location question

30 ft is close to fullwave for 10 m (1/4 lamda is ~2.5 m) so the wire should work down to about 40 m. However if it is close to your house and it is shielded as you wrote, it will influence reception and resonance.If you have metall tubes (water/heating) you can try to use them as ground and see if ...