Search found 114 matches

by alanzfq
Mon Jun 01, 2020 7:36 am
Forum: RTL-SDR Discussion
Topic: Bias T
Replies: 9
Views: 494

Re: Bias T

Or, if I look more carefully:-)
RTL_eeprom does it permanently.
Looks like your commands are correct.
Alan
by alanzfq
Mon Jun 01, 2020 7:26 am
Forum: RTL-SDR Discussion
Topic: Bias T
Replies: 9
Views: 494

Re: Bias T

If you look in that zip you will find 2 batch files.
If you look at those files you will see they work with rtl_biast.exe
Alan
by alanzfq
Thu May 28, 2020 7:06 am
Forum: RTL-SDR Discussion
Topic: automatic start
Replies: 2
Views: 196

Re: automatic start

Possibly in one of the configuration files.
I've never seen any reference, ask in the Airspy group.
It is even possible someone will offer a Plug-in.
Alan
by alanzfq
Wed May 27, 2020 8:01 am
Forum: RTL-SDR Discussion
Topic: RTL-SDR.com brand of FM trap - RF power limit?
Replies: 2
Views: 262

Re: RTL-SDR.com brand of FM trap - RF power limit?

You could look at the filter description!
It says some have said 5W with no damage but it's your risk.
Alan
by alanzfq
Sat May 23, 2020 10:39 am
Forum: RTL-SDR Discussion
Topic: Adalm Pluto as GPS Receiver
Replies: 1
Views: 210

Re: Adalm Pluto as GPS Receiver

I'd think a GPS antenna:-)
If the RX is really sensitive a simple puck. Probably better an amplified one with a bias T assuming those receivers have not got a Bias T.
Alan
by alanzfq
Tue May 19, 2020 8:20 am
Forum: RTL-SDR Discussion
Topic: Beginner-Want to listen air traffic
Replies: 21
Views: 9795

Re: Beginner-Want to listen air traffic

Best use separate coax.
Combiner/Splitters if available will be expensive, reduce signal strength unless active, maybe introduce problems.
Alan
by alanzfq
Thu May 14, 2020 7:28 am
Forum: RTL-SDR Discussion
Topic: GQRX - unexpected plot when changing frequency range
Replies: 14
Views: 3890

Re: GQRX - unexpected plot when changing frequency range

As I said 10dBm is a really big signal. The data sheet does not say but it probably represents the maximum before damage is done to the tuner. What I do know is that antenna signals are measured in microvolts. 1250 microvolts is far more than normally picked up by an antenna. I suggest reducing it, ...
by alanzfq
Wed May 13, 2020 8:30 am
Forum: RTL-SDR Discussion
Topic: GQRX - unexpected plot when changing frequency range
Replies: 14
Views: 3890

Re: GQRX - unexpected plot when changing frequency range

>So I'm figuring at the very most -45 dBm at the input of the SDR

Very most? I'm not going to look at the maths but -45dBm is 1.25mV into 50 ohms which is a BIG signal.

Alan
by alanzfq
Sat May 09, 2020 7:07 am
Forum: RTL-SDR Discussion
Topic: GQRX - unexpected plot when changing frequency range
Replies: 14
Views: 3890

Re: GQRX - unexpected plot when changing frequency range

You do not mention powers, how much power is transmitted? How much power is sent to the RTL? Is 10mW the maximum before damage is done? It is a very big signal compared with normal antenna levels microvolls, microwatts. As I say a dummy load is usually leaky enough to receive signals strongly from l...
by alanzfq
Fri May 08, 2020 7:04 am
Forum: RTL-SDR Discussion
Topic: VLF kit for a newbie
Replies: 4
Views: 1582

Re: VLF kit for a newbie

I'm told HDSDR will run with Wine but possibly no need to use Wine.
There are other SDR programs that are Linux only.
Again I'm told HDSDR will run on a Mac. But there are some MAC programs, DSP Radio was one.
Look for those.
Alan