rtl-sdr.com

Hi It's difficult to know the exact length to tune a telescopic antenna. The cable and ground plane play a big part. 1/4 wavelength is a good start point. Unless you have a VNA, you can just tweak for optimal reception. It all depends on how critical it is to extract those last few dBs of sensitivit...

Is this an antenna array? For DF for instance.

Or do you just need multiple channels that don't need to be coherent? Kerberos would seem like overkill.

Dipoles would work fine. Or you could have a sleeve dipole, if you only want the antenna to protrude out in one direction(to avoid snarling up on landing for example). One thing worth thinking about for use with Kerberos is that you need to have the antenna well isolated from the cable. That is, you...

Can you elucidate on 'airborne platform'? Is this a fighter jet, microlight or a hot air balloon for example? Where on the platform do you envisage placing the antennas?

I sell some ultra wide band antennas that cover a whole variety of interesting frequencies. I think they are a good start for exploring a while range of bands, but if you have any specific target applications you will probably be able to find a better narrow band antenna. https://www.tindie.com/stor...

All seem reasonable to me. I'm sure there lots of other info people could volunteer too. Just telling us the frequency ( in Hz) is a big help. Don't make us research that esoteric signal that may even be specific to your country. Cable lengths and types used is also worth knowing. What type(RG numbe...

It's not immediately obvious. Probably the two outer arms are connected together and the middle is the driven connected together the centre of the feed. It look alike the lid is removable, can you take some internal photos, or measure the resistance between each antenna arm and the centre and out co...

BladeRF micro 2.0 is very easy to get locked coherent Tx and Rx.

I guess that Pluto SDR might be ok as well, but I can't confirm this.

Considering a 2 way splitter firstly. When you split a signal, the best case is that half the power goes to each output. That's a 3dB reduction. An important characteristic of splitters is maintaining the characteristic impedance of the transmission line (normally 50ohms). To achieve this of the the...

I would love to help, but it's difficult with the information provided. I don't personally have any experience with the NOAA or Meteor systems, so it's hard to make recommendations. The reason it only works in one direction could be due to interference coming from the direction of interest. It sound...