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1500 questions
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votes
3 answers

Suggestions for mounting a mini-whip as high as possible

I've ordered two mini whip antennas from Ebay (Russia) for HF and MW. As power lines cross my city property in a L shape - the only way to get away from them is to go up. So I'm hoping that going 5-20 feet above my roof line will reduce the…
Aaron Kreider
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3 answers

SDR set up that will TX & RX on CB, UHF and VHF

I would like to use SDR to receive and transmit on CB, UHF and VHF. Is this possible and if so what type of equipment will I need (antennae, dongle etc)? I currently have both UHF/VHF and CB but atm have separate antennae for each rig. Reading about…
welfare
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Why does P25 occasionally break through tone squelch on my analog HTs?

When listening to our local repeater, which is now a combined P25/analog machine, every once in a while my squelch opens to a blast of digital noise. I've noticed this problem with at least two different Baofeng radios (a UV-3R+ and a UV-82). I have…
MoTLD
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1 answer

Antenna, input and ground bonding

I'm new to this and am in need of guidance. I am mounting a multi-band antenna on a 50 foot tall 1 1/4" galvanized mast. I plan to drive a ground rod at the base of the antenna and bond the mast to it. I also plan to ground the RG-8/U at the top…
user10650
4
votes
2 answers

Can you create a radio beam with a Faraday cage?

Imagine we have an isotropic antenna at the origin emitting a steady sine wave at frequency $f$. Encompassing the antenna is a sphere of radius $r$ made of a fine copper mesh (with holes $\ll\frac\lambda{10}$, making it a Faraday cage). From this…
Jerald Thomas
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4
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1 answer

Can an American licensee operate in Portugal during a visit?

I have an American Amateur Extra Class licence (AC1DM) and I'm going to Portugal for a few days. Can I operate there with my licence? I'm not an American citizen.
Pablo Fernandez
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4
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1 answer

Do people really do GMRS liscenses

Sometimes on my Chinese uhf/vhf amateur transceiver, which goes all the way to 520 megahertz, i listen to GMRS/FRS/MURS frequencies. I always hear little kids messing around in the neighborhood on GMRS. Does the FCC really care about this? And what…
Skyler 440
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3 answers

Radials on a vertical, spread out evenly or not?

To have a groundmounted quarter wave vertical with a decent efficiency you need at least 16 radials. So normally you would spread them out on the ground evenly around the base. This would give an angle of 360/16 = 22,5 degrees between two…
ON5MF Jurgen
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2 answers

Sound quality in portable FM radio devices vs dedicated stations

When speaking to a portable radio transmitter the sounds usually gets distorted. However in radio stations that are dedicated to play music the sound is significantly better. First of all, why? And second how can I make it better? The system I use…
Adam Katav
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4
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4 answers

Bluetooth headset for transceiver?

Is there a way to use a Bluetooth headset with my transceiver to eliminate all the wires, like a Bluetooth adapter? It seems like all the Bluetooth applications require a smartphone in the loop somewhere, and I don't have one.
K9WIS
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6 answers

Cordless phone consistently experiencing RFI

I've tried several cordless phones (most recently KX-TG570), and all seem to frequently pick up terrible RF interference. I have a neighbor that is a ham enthusiast, with large antenna masts on the first rooftop, and it does seem to coincide with…
g g
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4
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1 answer

How to measure signal power in GNU Radio.(I wondered how much dBm is specific.)

I used the "QT GUI frequency sink" and "WX GUI FFT sink" to measure the signal. But I got different value. I would like to know what dB stands for in them. Whether it is dBm or just a ratio.
H.Dog
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3 answers

What is the process of sending an NTS message in to a disaster area?

I have a friend of mine that is from Puerto Rico, and hasn't heard from her family in some time. I am aware of the NTS, and have considered sending a message into the area to see if any word of her family could be determined. I'm not sure what the…
PearsonArtPhoto
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4
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3 answers

2m Biquad - Why not?

I'm thinking about putting together an Echolink link node on my local repeater frequency so I can participate in the weekly net when out of town. This seems straightforward as it's simply: Being in an HOA, I have to try and keep my house from…
William
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4
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3 answers

Substitute for Dacron rope in antennas

I am building an antenna that specifies the use of Dacron rope to help support the spreaders, but that is not readily available in Trinidad and Tobago. What will be a good replacement with regards to UV resistance?
bigaone22
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