Search found 177 matches

by snn47
Mon Oct 14, 2019 6:35 pm
Forum: RTL-SDR Discussion
Topic: Power consumption
Replies: 1
Views: 14

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: 1
Views: 13

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: 1
Views: 103

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: 4
Views: 393

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 ...
by snn47
Fri Oct 11, 2019 7:16 am
Forum: RTL-SDR Discussion
Topic: SDR has clear strong signal, 2 Meter ham rig has bad signal using same antenna
Replies: 3
Views: 203

Re: SDR has clear strong signal, 2 Meter ham rig has bad signal using same antenna

Always check the transmission line (cable, switches and ...) first.

Did you check for faulty distribution, meaning exchange the two receiver, connecting the TR-7400 to the cable you used for the SDR and the SDR to cable previously used by the TR-7400?
by snn47
Thu Oct 10, 2019 2:15 pm
Forum: Antennas
Topic: Antenna location question
Replies: 4
Views: 393

Re: Antenna location question

Since HF covers about 160 m to 10 m of wavelength performance will be dependent on Frequency. You will receive signals, but unless you bring an antenna into resonance it is impossible to predict antenna pattern in azimuth and elevation. With loop antenna do you refer to untuned ones or tuned one win...
by snn47
Thu Oct 10, 2019 1:35 pm
Forum: Troubleshooting Help
Topic: High-pass filter characteristics for RTL-SDR.com ADS-B filtered amp?
Replies: 4
Views: 179

Re: High-pass filter characteristics for RTL-SDR.com ADS-B filtered amp?

SAW filter are Band-pass filter, to get an idea for a 978 MHz 6 MHz wide filter curve look here https://www.rfmw.com/products/detail/ta ... st/457856/
by snn47
Wed Oct 09, 2019 8:17 pm
Forum: Antennas
Topic: antenna related information and guidance for asking questions to improve chances for an answer
Replies: 6
Views: 1500

Guidelines for choosing coax cable for use >1000 MHz

Guidelines for choosing coax cable for use >1000 MHz possibly not complete, but that should suffice for a start: Know which impedance receiver has and you know what impedance your coax cable and connector should have Decide if you desire low loss, max. shielding or both While low loss per dB/m (or ...
by snn47
Wed Oct 09, 2019 7:57 pm
Forum: Antennas
Topic: antenna related information and guidance for asking questions to improve chances for an answer
Replies: 6
Views: 1500

Re: guidance for asking antenna related questions improves chances for an answer -proposal for a sticky post

@nizz -freq scan noob I tried to rephrase and provid an example. Does this explain it better? - transmisson line loss (cable and connectors)vs. antenna gain guidance for choosing coax cable can be found here https://www.rtl-sdr.com/forum/viewtopic.php?f=6&t=4861&p=12432#p12432 All transmission lines...
by snn47
Wed Sep 25, 2019 6:05 am
Forum: Antennas
Topic: What is a good wide range antenna for desktop sdr
Replies: 4
Views: 471

Re: What is a good wide range antenna for desktop sdr

As said before what is the frequency range you are interested in, which polarisation have the signal you want to receive? I suggest you look at https://www.rtl-sdr.com/forum/viewtopic.php?f=6&t=4861 for more information on what you might want to ask and which information you should provide to get th...