Amateur Radio Stack Exchange
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Ideal antenna type for FM 2 meters?

Clearly, building a Yagi tuned for 2 meters will likely have the best directional performance. Putting that aside, I'm trying to get information on what antenna type will have the best overall performance in the 2 meter band in an NFM mode. I have…
David Hoelzer
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Audio tones and patterns used for fox-hunt transmitters?

Question: What are the most effective audio tone frequency(s) and pattern(s) used in direction finding in the world of amateur radio? Also: Is there a specification for the tones that amateur radio fox hunt transmitters use, and if so, is it…
Steve
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Installing cuSDR on Ubuntu 13.04

I've been trying to install cuSDR64 on Ubuntu so as to have a 4-receiver 4-display SDR setup. I found the Windows repository on svn here. But, it gives an error (check this question). The cuSDR home page does mention that it can be built on Linux as…
TomKat
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What is the best battery type for replacing old NiCds in a Icom 2AT?

I broke out my 2AT after a number of years. The nicads in it are dead. What kind of replacement inserts should I be looking for? Nicads are so 1980s. What is the current 'best' technology?
EvilTeach
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Why did I lose my FM radio signal?

My lady and I were driving on the interstate recently when we noticed an unusual phenomenon. We were listening to the radio (an FM signal), and only over a couple of bridges did we entirely lose our signal. I had some ideas explaining this but I'm…
Sam
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Help with readings on schematic

I am in a Kenwood TK805D and a Kenwood TM241A to interface some of the hidden inner circuitry with the outside world so I can use the radios to do more than just talk on (ex. AllStar node, cross band repeater, packet radio, and much more.) I think…
Skyler 440
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Rain and RF noise

I noticed when operating Field Day this year that during a period of rain, the RF background noise went up as well, from about S2 to S5-6. I was operating inside a tent, with the antenna outside the tent. It got me thinking though, is there things…
PearsonArtPhoto
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How can I operate in the rain safely?

For Field Day this year, most stations on the East Coast received a large amount of rain. I've heard our reports at around 2 inches of rain. Being Field Day, we were operating outdoors inside tents, but we still had a few issues with the radios,…
PearsonArtPhoto
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Cross Yagi Antenna Design

What will be the effect if I add the insulation between elements and metallic boom of the cross yagi antenna (where elements from outside of the boom, instead of through boom) and in this case boom correction is required? If this is not the best…
0x47-sci-tech
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Cellular VHF Interference

I just got my license a week ago. Installed a new VHF/UHF radio in my car and everything seems to be working great. I've been heard at distant locations and picked up signals from repeaters that are way beyond where I expected to reach. However…
Matt KG7UDH
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Calculating effective SSN (sunspot number)?

I am doing research on how SSN-like parameters affect HF radio signals. As I can see, effective SSN is a parameter that is derived from SSN or using other parameters. Does anyone know how to calculate effective SSN? For example, this file has some…
lsc
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Morse code for hash (#)

Is there a morse code for a hash character? If so, what is that morse code? My thoughts where that there is morse code for an @ but why not for a #?
Thealon
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Stub impedance matching

What is the process of stub impedance matching and what are the elements included in the calculations relevant to it?
Max
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Coaxial Folded Dipole Antenna Matching Impedance

In http://www.nsw.wicen.org.au/technical/projects/coaxial-folded-dipole-antenna, the guy is using a 50 ohm coax cable to build a folded dipole antenna and claims that this will enable use at 50 ohm (I assume the required matching impedance). Now,…
user4575
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Command-line satellite tracking software

Is there any software similar to Gpredict but which can be used without a GUI and can control rotor Az/EL and radio doppler shift? I'm using Linux in particular, especially Ubuntu 14.04. Currently, I can control rotors and radio via Gpredict's…
user80551
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