Search found 128 matches

by JEL
Sun Feb 11, 2018 2:17 pm
Forum: Antennas
Topic: How Long Should My Coax Cable Be?
Replies: 1
Views: 1916

How Long Should My Coax Cable Be?

Newbies are such easy targets... :lol:

It took me a few tries before I understood what was going on here, but it made me laugh, so I thought I would share it:

"How Long Should My Coax Cable Be?"

http://www.qsl.net/w4sat/howlong.htm
by JEL
Sun Feb 11, 2018 2:14 pm
Forum: Antennas
Topic: What happens if I hook up a loudspeaker as antenna?
Replies: 9
Views: 5416

Re: What happens if I hook up a loudspeaker as antenna?

I really like this video for giving an easily understood and importantly accurate guide to how antennas work. https://youtu.be/T-SbBlNgUTU After that the http://www.antenna-theory.com/m/index.php website is a really good source of information. Then, if you want to play and experiment 4nec2 is an ea...
by JEL
Sat Feb 10, 2018 3:55 am
Forum: Antennas
Topic: What happens if I hook up a loudspeaker as antenna?
Replies: 9
Views: 5416

Re: What happens if I hook up a loudspeaker as antenna?

your speaker coil is really just acting as a large inductor. At RF frequencies this will have a very high impedance and basically just look like an open circuit. i.e very little current will flow into it. With your shorted ends two wires will couple inductively and should largely have the same curr...
by JEL
Fri Feb 09, 2018 7:25 am
Forum: Troubleshooting Help
Topic: Plugin LevelMeter
Replies: 4
Views: 2551

Re: Plugin LevelMeter

I use the same version of Level-meter on SDR# version1637 on Windows10, so it should work.

Did you also copy the .xml file along with the .dll?
Both are needed.
by JEL
Fri Feb 09, 2018 7:10 am
Forum: Antennas
Topic: What happens if I hook up a loudspeaker as antenna?
Replies: 9
Views: 5416

Re: What happens if I hook up a loudspeaker as antenna?

Experiment done. No harm happened, but the dipole I mentioned outperforms the 'speaker-antenna' (Just barely) The dipole is a 10 meter (2 poles each 5 meter long) laid across the floor from wall to wall (It's a small 1st floor apartment with a basement below, so not quite at the ground. I'd say my f...
by JEL
Thu Feb 08, 2018 3:03 pm
Forum: Antennas
Topic: What happens if I hook up a loudspeaker as antenna?
Replies: 9
Views: 5416

Re: What happens if I hook up a loudspeaker as antenna?

The extra coil probably won't do much, but I don't see any harm in trying as long as the speaker is powered off. I will give it a go one of the next days and return with the results :) (Experimenting with a horizontal 10 meter dipole at the moment) The speaker is passive (So it will operate like a ...
by JEL
Thu Feb 08, 2018 3:43 am
Forum: Antennas
Topic: What happens if I hook up a loudspeaker as antenna?
Replies: 9
Views: 5416

Re: What happens if I hook up a loudspeaker as antenna?

Why would you think a speaker would be any good at all? If you are thinking its because of speakers can deal with low frequencies, it won't since antennas are dictated by wavelengths and the speed of sound is different to light. It is not the speaker itself I think has any benefit, but the coiled w...
by JEL
Wed Feb 07, 2018 3:17 am
Forum: Antennas
Topic: What happens if I hook up a loudspeaker as antenna?
Replies: 9
Views: 5416

What happens if I hook up a loudspeaker as antenna?

What happens if I hook up a loud-speaker as antenna? (Not just the wire, but the actual speaker) I am trying to get as much reception in low-frequencies as possible, so understand I need a very long wire (Longer than what is normally possible to lay out indoors) So, I have a loud-speaker, which is a...