Search found 167 matches

by snn47
Wed Apr 26, 2017 1:20 am
Forum: RTL-SDR Discussion
Topic: New project idea!
Replies: 3
Views: 2759

Re: New project idea!

You will receive not only the signals you want to receive but also often a lot stronger other signals e.g. Base stations which can interfere, cause desensitizing, blocking or intermodulation or …. Meaning the usual problems for a receiver that will stop you from receiving signal for one reason or an...
by snn47
Wed Apr 26, 2017 12:49 am
Forum: RTL-SDR Discussion
Topic: Which upconverter to buy???
Replies: 6
Views: 4526

Re: Which upconverter to buy???

Do you want to built the converter yourself or a prebuilt converter. For both you can find information checking the HAM radio publications. In the SW bands especially around 7 MHz you will most likely have problems due to the large density of strong signals which can produce desensitization, blockin...
by snn47
Wed Apr 26, 2017 12:31 am
Forum: Antennas
Topic: Loop antenna for frequency range of 160 meters to 10 meters
Replies: 6
Views: 5452

Re: Loop Antennas ????????????

Youre welcome. As a suggestion you may consider modifying your title to reflect what you want to use the Loop antenna for to allow others to identify if the information contained in this thread might be interesting to them or if they can contribute something as well e.g. Loop antenna for and then th...
by snn47
Wed Apr 26, 2017 12:27 am
Forum: Antennas
Topic: Total beginner
Replies: 4
Views: 4795

Re: Total beginner

You havn't specified if you want to just receive the Radars signal or intend to receive reflections of the RADAR signal like moon meteor reflections or ... The antenna needed depends therefore on what you aim to receive, the strength of the polarization and strength of the signal at your location. I...
by snn47
Tue Apr 25, 2017 11:12 am
Forum: Antennas
Topic: Loop antenna for frequency range of 160 meters to 10 meters
Replies: 6
Views: 5452

Loop Antennas !!!!!!!!!!!!!!! if you do it right

A tuned magnetic antenna works also well inside a building, unless you have steel increased concrete. A short overview is also on https://en.wikipedia.org/wiki/Loop_antenna The word I couldn't remember and added to my above post was High Frequency Litz wire, which is a multi-stranded wire each isola...
by snn47
Mon Apr 24, 2017 9:40 pm
Forum: RTL-SDR Discussion
Topic: New project idea!
Replies: 3
Views: 2759

Re: New project idea!

i need to detect the presence of a mobile phone in a area You should be more precise when you ask, which mobile phone services e.g. 3g, Edge, LTE .... what is the diameter of the area you are interested in, which bands do you want to monitor? Due to frequency auctioning in many parts of the world t...
by snn47
Mon Apr 24, 2017 9:31 pm
Forum: Antennas
Topic: Loop antenna for frequency range of 160 meters to 10 meters
Replies: 6
Views: 5452

Re: Loop Antennas ????????????

Somethings that I come to understand about loop antennas from surfing the internet. The fatter the loop the better it works. Thirty six inch's diameter single loop for a wide band loop antenna . Wide band loop antenna should be half wave of the lowest frequency you want to receive . Surfing the net...
by snn47
Thu Mar 16, 2017 5:30 am
Forum: RTL-SDR Discussion
Topic: Placement of LNA
Replies: 19
Views: 10058

Re: Placement of LNA

PS: Did your supplier specify the impedance for the
Sirio SD 1300 fom DNJ Radio
at Amazon.com there is no Impedance speciifed
by snn47
Thu Mar 16, 2017 4:32 am
Forum: RTL-SDR Discussion
Topic: Placement of LNA
Replies: 19
Views: 10058

Re: Placement of LNA

While shielding is important, low attenuation for short pigtail is imho a secondary priority to mechanical stability. Every connector will add at best best a few tenth of a dB attenuation. The longer you use, (dis)connect connectors and cable repeatedly, the worse it will get. Then you need to have ...
by snn47
Thu Mar 16, 2017 2:30 am
Forum: RTL-SDR Discussion
Topic: Placement of LNA
Replies: 19
Views: 10058

Re: Placement of LNA

walrusgumboot I was speaking about the COM/NAV/SUR equipment designs that I know about. The definition of wideband will vary with the bands and signal width and operational use of the frequency band and age of the equipment. Selectivity was a must in case of (T)Rx for SW or below. ATC-COM at VHF you...