Search found 47 matches

by Kenn
Thu May 02, 2019 10:17 pm
Forum: RTL-SDR Discussion
Topic: confused: spectrum analizer and sdr
Replies: 7
Views: 1194

Re: confused: spectrum analizer and sdr

I use a netbook running Linux Mint and Pavel's Spektrum: https://www.rtl-sdr.com/spektrum-new-rtl-sdr-spectrum-analyzer-software/ It'll scan 430-830 just fine. Using 'Relative Mode' is key. With a rubber duck antenna connected directly to the RTL dongle on a short USB cable I can turn the gain down ...
by Kenn
Thu Apr 04, 2019 6:22 pm
Forum: RTL-SDR Discussion
Topic: Do I have latest linux driver?
Replies: 3
Views: 694

Re: Do I have latest linux driver?

Backing up what Admin and hotpaw2 posted, the Osmocom driver is probably the best all around choice. It seems to work with most apps. I've done some informal experiments with the Keenerd fork of the driver. It seems to work noticeably better with CubicSDR and Spektrum (ie better reception, fewer spi...
by Kenn
Thu Oct 11, 2018 7:30 pm
Forum: Other SDR Devices
Topic: Why Tx/Rx devices are so expansives ?
Replies: 9
Views: 18967

Re: Why Tx/Rx devices are so expansives ?

The rules of mass production I suspect. If there was a demand for SDR similar to cell phones, they'd be mass produced and the unit price would be less.

-K
by Kenn
Tue Jul 31, 2018 2:25 am
Forum: Antennas
Topic: HF Antenna for balcony
Replies: 10
Views: 29248

Re: HF Antenna for balcony

The G5RV antenna is a proven and well regarded antenna amongst hams, but it need 102 feet of space.

The mini-whip antenna, I don't know much about. It's not too expensive, might be worth a try.

You might look at magnetic loop antennas. They tend to be pricey, but are said to work well.

-K
by Kenn
Mon Jul 30, 2018 7:07 am
Forum: Antennas
Topic: Balanced antenna for direct sampling
Replies: 5
Views: 4921

Re: Balanced antenna for direct sampling

Your build looks good, thumbs up! My only concerns would be heat and static. I'd go for a V3 to solve that. I've used TV baluns and RG-6 for many a project, they work fine. The feed-point impedance of a 1/2w dipole is ~73 ohms, super close to RG-6's 75 ohms so you wouldn't even need a balun for that...
by Kenn
Mon Jul 30, 2018 6:35 am
Forum: Antennas
Topic: HF Antenna for balcony
Replies: 10
Views: 29248

Re: HF Antenna for balcony

I had a balcony like that once but only on the 2nd floor. It had a metal railing so I fabricated an angled mag-mount and placed it on the inside so it couldn't be seen from outside. It had a standard 3/8" x 24 thread so I could use all sorts of compact mobile antennas like hamsticks for HF and simpl...
by Kenn
Fri Jul 27, 2018 6:20 am
Forum: Antennas
Topic: Any antenna suggestions?
Replies: 3
Views: 3717

Re: Any antenna suggestions?

I've had good results using folded dipoles for FM broadcast. They have more bandwidth than a simple dipole and are mildly directional which can help null out nearby offending stations. I usually make them from 300 ohm twinlead and put a 300-75 ohms balun in the center and feed it with RG6. I've put ...
by Kenn
Wed Apr 18, 2018 5:19 pm
Forum: RTL-SDR Discussion
Topic: Help listening to Shortwave
Replies: 17
Views: 9371

Re: Help listening to Shortwave

Yes, your version 3 will tune down to 100 kHz with no additional hardware nor internal mods. One selects Direct Sample mode, as you've already done. What I suspect is we can figure this out via software settings, most likely gain. Even with just a few arm-lengths of wire you should be able to pickup...
by Kenn
Thu Apr 05, 2018 7:49 am
Forum: RTL-SDR Discussion
Topic: Will the RTL-SDR work for digital frequencies?
Replies: 7
Views: 3759

Re: Will the RTL-SDR work for digital frequencies?

In short, yes, with a few caveats. Public Service communications in the US that have gone digital typically use the APCO/P25 system, usually in the 800's-900's MHz. (You can check www.radioreference.com to confirm that for your area). The RTL can receive in those frequency ranges easily enough, the ...
by Kenn
Sat Jan 13, 2018 6:04 am
Forum: Antennas
Topic: Hookup to TV antenna?
Replies: 2
Views: 2332

Re: Hookup to TV antenna?

That should work well for VHF/UHF, definitely work trying.