Amateur Radio Stack Exchange
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1500 questions
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3 answers

Baofeng low power mod

I have a few baofeng UV5R handhelds sitting around that only transmit, the receiver is damaged. What I would like to do with these is build a foxhunt transmitter. Sure, I could set it to low power (1 watt) and put it through a less efficient…
Skyler 440
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Is a modded Yaesu FT-270r acceptable to use on MURS frequencies?

I am a bit new to the radio scene, so excuse me for any ignorance that may follow. I saw on a website that you could mod the Yaesu FT-270r so that you can increase its transmission range outside of 144 MHz. I have no plans on transmitting outside of…
RailfanCJ
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What does a SSB signal look like?

I don't really get it. How is it possible to just send upper or lower side of a band (SSB USB/LSB): And how is it possible to send anything without the carrier wave! If I have misunderstood anything I am sorry because I am new to this and would…
Axel
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Can there be (long range) propagation of HF from satellites?

HF transmissions from the ground can be reflected by the ionosphere leading to very long distance propagation. Satellites in low Earth orbit (160 km to 2,000 km) fly within the ionosphere (60 km to 1,000 km); with the F layer at 150 km to 500+…
DarcyThomas
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Why do so many HF transceivers use a UHF connector?

Just looking around at various rigs online for a fiend. Lots of them look really attractive TS-480, K2, K3, FT-450D, FT-950, IC-78, FT-897 to name just a few... These rigs are mostly HF, albeit some are also VHF/UHF capable. Yet the antenna…
VU2NHW
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What is the procedure to obtain an amateur radio licence in Australia?

What and how would I go about obtaining a licence for HAM radio in Australia? Do the licencing regulations vary significantly from state to state?
user17
9
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1 answer

Antenna size for wideband

I just bought a SDR dongle that comes with an antenna. The dongle is for DVB-T. The antenna is very small but the specs say that the dongle can go 30Mhz to 850Mhz. From my knowledge of antenna physical size should be 1/4 the size of the…
Martin Naughton
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When will my new license appear in the FCC database?

I tested and passed my Technician's test on Thursday, June 4, 2015. Approximately how long will my license take to appear in the FCC database?
Melona380
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What causes ground losses in a HF antenna system?

This applies to mobile and fixed installations. What are ground losses, and how can they be minimized? It seems to involve proximity to the ground, but what is the mechanism that causes loss? Does antenna installation height influence ground loss in…
Bill - K5WL
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Antenna modeling on non-uniform terrain

I'm interested in modeling the radiation pattern of wire antennas for hf before I invest the resources necessary to erect the antenna. I'm familiar with tools such as 4nec2, but from what I can tell the ground is modeled as being flat. However, at…
W5VO
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2m or 70cm FM mobile radio for digital mode operation

Are there any 2m and/or 440cm FM mobile radios that have audio inputs for supporting digital modes, like PSK31 or SSTV? I have a Rigblaster that I use with my HF radio so I could get a mike cable and connect it directly to the mike input in the same…
Kevin Hooke KK6DCT
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What privileges do I gain with each addition step of the license (in the UK?)

The UK has 3 licensing levels, foundation, intermediate and advanced. Aside from the allowed power output going up each time (10W, 50W, 400W) are there any other privileges one would gain?
berry120
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Advantage of 6 meter repeaters

6 meters seems to be a place where when the conditions are right, repeaters may interfere with each other from far distances, but when the conditions are normal, repeaters are similar to 2 meters. What is the advantage of installing repeaters on 6…
Skyler 440
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Building a portable event repeater

How does one go about building a portable repeater for use at events? Preferably at low cost, and with a minimum of bulky parts (so it's travel friendly). Obviously you'd need a pair of radios to handle RX and TX, taking into account that the TX…
Trevor Johns
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How can you calculate the frequencies for each band?

I've just started studying for my HAM license a couple of weeks ago, so please excuse me if this is a remedial question... I have the Canadian Amateur Radio Basic Qualification Study Guide (which I'm finding is terribly hard to understand). Their…
BenAlabaster
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