Search found 49 matches

by joe36
Wed Mar 31, 2021 12:12 am
Forum: RTL-SDR Discussion
Topic: GEOS Software Question?
Replies: 3
Views: 430

Re: GEOS Software Question?

With the amplifier placed close to the antenna, using a reasonably low loss coax such as rg6. A very long way, several hundred foot. The amplifier gain will exceed the coaxial loss for at least that distance. In a perfect world the amplifier would provide just enough gain to overcome loses, 0Db at t...
by joe36
Sat Mar 27, 2021 11:23 pm
Forum: Antennas
Topic: UHF (SO-239) antenna bases?
Replies: 6
Views: 726

Re: UHF (SO-239) antenna bases?

A dipole ½ wavelength has around 3db over A 1/4 wave monopole worked against a ½ wave diameter conductive disk. This is due to the radiation pattern of a dipole being a figure 8 and a 1/4 worked against a conductive surface. This gives no account to conductor diameter or velocity factor. Something t...
by joe36
Sat Mar 27, 2021 7:21 am
Forum: Antennas
Topic: UHF (SO-239) antenna bases?
Replies: 6
Views: 726

Re: UHF (SO-239) antenna bases?

I think you misunderstood my post. Or I misunderstood yours? “Antenna efficiency meaning how much power of a signal is received and converted into a signal for your receiver is not the same as impedance match”. At 50Mhz a whip style antenna 82" long worked against ground has a radiation resistance o...
by joe36
Tue Mar 23, 2021 2:28 pm
Forum: Antennas
Topic: UHF (SO-239) antenna bases?
Replies: 6
Views: 726

Re: UHF (SO-239) antenna bases?

You DO NOT WANT! The magnetic mount. It will not work for this application. Do you have a railing with vertical supports? If so you might be able to use hose clamps to hold it on. The Discone antenna is a very good choice for a wide frequency range. The type of antenna you have purchased. The diamon...
by joe36
Sun Mar 21, 2021 1:23 am
Forum: Antennas
Topic: Question about this Mini-Whip
Replies: 2
Views: 343

Re: Question about this Mini-Whip

yes

joe
by joe36
Fri Mar 19, 2021 9:55 am
Forum: Antennas
Topic: Test antenna
Replies: 10
Views: 1156

Re: Test antenna

I must apologies for the type O it was suppose to be a capital I. As with tonight. I was typing in the dark. With a bit of insomnia. YES I use and highly recommend RG6 coax. There are some very small diameter coax good for moderate lengths at HF and below They are usually have high loss. Unless it i...
by joe36
Fri Mar 19, 2021 12:53 am
Forum: User Projects
Topic: Home-brew USB, VFO tuning knob.
Replies: 3
Views: 706

Re: Home-brew USB, VFO tuning knob.

VERY nice! A+
Joe
by joe36
Mon Mar 15, 2021 2:23 am
Forum: Antennas
Topic: Test antenna
Replies: 10
Views: 1156

Re: Test antenna

Followup of previous post You had ask on a post if you need a SDR stick? This is a question that only you can answer. If listening to web SDR is what you want. You will have a lot of options on equipment already setup and never run out of signals. If you want a SDR to be in your hand then, maybe? Th...
by joe36
Sun Mar 14, 2021 4:22 am
Forum: Antennas
Topic: Test antenna
Replies: 10
Views: 1156

Re: Test antenna

I use the RG6 almost exclusively anymore. O don’t but it as it is just about every were as scrap on old satellite dishes or abandoned cable runs. I have even found roles with 400 to 600 foot on them at the good will for a couple of dollars. You can get coaxial adapters at minimal cost from AlieExpre...
by joe36
Tue Mar 09, 2021 4:01 am
Forum: Antennas
Topic: Test antenna
Replies: 10
Views: 1156

Re: Test antenna

With the small magnetic antenna you have a good base to start. As a mono pole whip. It would work better on a metal surface such as a large pizza pan. Better yet, If you open the antenna in the center of the magnet the coax will attach to the antenna and the shield to a washer that the magnet sticks...