Search found 110 matches

by JEL
Sun Feb 10, 2019 6:33 am
Forum: Troubleshooting Help
Topic: Buzzing but no AM signal
Replies: 4
Views: 2474

Re: Buzzing but no AM signal

Looks like noise to me too.

And your noise-floor at -30 dB seems very high, so a lot of the air-signals may be under that.

You should be able to get the noise-floor down to at least -60 dB.
by JEL
Sat Feb 09, 2019 3:19 am
Forum: Signal Identification Help
Topic: 'shooting star' (mirror freq interference)
Replies: 0
Views: 2420

'shooting star' (mirror freq interference)

I was testing a new antenna I have put up and ran into the cutest little mirror frequency interference I have seen to date :) I made a 60 second long video of it and just thought I would share it here :) I am sweeping very slowly across the spectrum and it shows up a bit over half way into the video...
by JEL
Fri Feb 08, 2019 5:05 pm
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 16
Views: 11570

Re: Long USB-cable vs long antenna-cable?

Yes, I am worried about that too (adding an extra computer, since in my experience they are some of the worst noise-offenders, along with television-sets. At least those 2 device-types are those that make most of the noise I find here in my setup) I am currently testing a 45' (15 m) antenna-cable, a...
by JEL
Tue Feb 05, 2019 9:03 pm
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 16
Views: 11570

Re: Long USB-cable vs long antenna-cable?

I haven't seriously considered the Raspberry Pi, but maybe at a later stage I will look into that (if all else fails totally) Thanks for the suggestion :) I just got a few parts in the mail, so in the next few days I will test the long antenna-cable option. I am hoping that will go well, but we will...
by JEL
Thu Jan 31, 2019 9:23 am
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 16
Views: 11570

Re: Long USB-cable vs long antenna-cable?

I tried some 'USB over Ethernet' adapters and if I need to describe them with one word: "suck" Thanks. I won't waste time or money investigating that as an option then :) Obviously, with the USB 2.0 limit being around 16 ft (cables normally available up to 15 ft) the chances of a passive cable segm...
by JEL
Tue Jan 29, 2019 4:37 pm
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 16
Views: 11570

Re: Long USB-cable vs long antenna-cable?

crash RTL-SDR. When it does, you have to replug the device. I have had that problem myself with a cheap SDR when run on a combined 10 meter (30 feet) USB cable (one passive 5-meter and 1 active 5-meter cable) That was one of my first SDR experiments and back then I didn't know about the USB length-...
by JEL
Tue Jan 29, 2019 6:55 am
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 16
Views: 11570

Re: Long USB-cable vs long antenna-cable?

I want to try a discone... indoors... at the ground-floor of an apartment-complex... surrounded by noisy neighbors and all their gadgets... (including those inherent to the building and city's infrastructure) so pretty much the worst of all worlds :) I expect my max cable-range to remain below 100 f...
by JEL
Mon Jan 28, 2019 5:53 am
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 16
Views: 11570

Re: Long USB-cable vs long antenna-cable?

I once asked this exact question for a WiFi card and I was told a longer USB cable is preferred. But in your case I suppose you could also get away by using a longer coax with an LNA instead. Thanks. I would prefer having the SDR close to the antenna, but the price for an optical USB-extender is ar...
by JEL
Mon Jan 28, 2019 4:44 am
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 16
Views: 11570

Long USB-cable vs long antenna-cable?

Which option is more advisable? Running the SDR close to the antenna with a long USB-cable going to the computer in a different room or Running the SDR close to the computer with a long antenna-cable going between the antenna in the other room and the SDR near the computer. I ask because I would lik...
by JEL
Thu Jan 03, 2019 6:32 am
Forum: RTL-SDR Discussion
Topic: Unknown broadcast/tuning method?
Replies: 2
Views: 715

Re: Unknown broadcast/tuning method?

It could be the tuning that is off. Try tuning in very small steps. I have found, when I get that 'StarWars' sound (in the scene in eps4, where they blow up the DeathStar, the radio-com sounds just like detuned SSB :) ), that detuning usually helps clear the sound. A few tens or hundreds of Hertz of...