Search found 4 matches

by soooooil
Thu Oct 24, 2013 5:57 pm
Forum: Other SDR Devices
Topic: A lower frequency SDR?
Replies: 6
Views: 18305

Re: A lower frequency SDR?

Well, yes, it's called upconverter :)
It does exactly what you want — shifts the lower frequency in the range where your sdr can receive.
The lower limit is slightly higher than DC only because of not ideal components. And there is not much you can do about it.
by soooooil
Sat Oct 19, 2013 3:48 pm
Forum: Other SDR Devices
Topic: A lower frequency SDR?
Replies: 6
Views: 18305

Re: A lower frequency SDR?

Yes, upconverter would be the only (relatively cheap) choice here. But I doubt you'll be able to receive as low as 10 kHz, most upconverters work from few MHz and up. I believe the reason for this is that dongles AGC acts like crazy around LO frequency and you see only spurs. Theoretically it can be...
by soooooil
Mon Sep 30, 2013 5:46 pm
Forum: Antennas
Topic: Antenna Switching
Replies: 3
Views: 14395

Re: Antenna Switching

Yeah that switch will work, but you can easily do one like that yourself. Some sma (or any other) connectors like this and few ordinary toggle switches (or one multi position switch) and you just have to connect it all on a piece of pcb or just in some enclosure. That is of course the most frugal so...
by soooooil
Wed Sep 11, 2013 6:45 pm
Forum: Off-Topic
Topic: Connection order
Replies: 3
Views: 14802

Re: Connection order

Yes, LNA should be the first one but the thing is, if your LNA is designed to amplify starting not from DC but from certain frequency it may be wiser to put it after the upconverter to amplify already converted signal on the frequency that is in range of LNA.