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1500 questions
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3 answers

How do I connect a GPS receiver to a radio for APRS?

I volunteer with the local search and rescue group as a team medic and a radio operator. The team is new and recently decided to go with the Garmin 64st as our go-to GPS units. Those of us with licenses use the cheaper Baofeng UV-5R and BF-8HP…
john.weland
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Best way for US ham to join RSGB

Overseas hams can join RSGB from their site for 51 GBP, which today is about 79 USD. USA hams can also join through the ARRL for 75 USD. Assuming the $4 is not a factor, are there any advantages to joining directly with RSGB in terms of membership…
James
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1 answer

UK Foundation - initial practical assessment, what to expect?

I'm going to be starting the Foundation course in the next few weeks, and have been offered an initial practical assessment at a member's shack to save time for the club during the course. The call to be made is on 2m with a QSY, so I'm wondering…
luxpir
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Comparision between BFSK and BPSK

Why is BPSK preferable over BFSK? On what parameters this comparison is based? What are the advantages of BPSK?
shweta
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2 answers

What's the unlicensed power limit for 5.8 GHz (5 cm) transmissions?

5.8 GHz NTSC video transmitters are popular for FPV (first person view) model aircraft flying. However, because the 5.8 GHz band (5725 to 5875 MHz) is also available for ISM (unlicensed) use, it's not clear to me at what point I need a license to…
Nick T
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Can a WLAN device be used with GNU Radio?

Can I use my wireless ethernet card with GNU Radio? I have a Broadcom BCM4311 mini PCIe, and Debian / Kali 2.0 Linux.
motoku
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4
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1 answer

Repeater autopatch ("phone patch"): which countries use this?

The section Operating Your Ham Radio in an Emergency from Ham Radio For Dummies recommends using an "emergency autopatch" to reach the emergency services when reporting an emergency from an amateur radio transmitter: State clearly that you are…
user5147
4
votes
2 answers

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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4
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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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4
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4 answers

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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4
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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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