Top new questions this week:
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I have Kenwood TH-D72 2m/70cm HT. According to the manufacturer the sensitivity is "Less than 0.18 uV". I would like to check this, since the radio is not new and I'm not it's first owner.
To do this ...
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When designing a waveform for packet radio usage, it'd be helpful to know a few things, mainly
distribution of coherency bandwidths
distribution of coherency times
Whilst such statistics are ...
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I finished building my Rockmite ][. It's running off of 3x 18650s, or 12v. I connected it to a MFJ-1840T and held the antenna horizontally in the air (also tried vertically) with my hand. I tried ...
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Recently I've been reading about EME and there was one thing that surprised me. Many sources claim that EME has path loss for 2m band about 252 dB. In the same time they claim (one, two):
Recent ...
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Last night was my first night on the air as a General licensee and at HF. I've got an IC-7300 with the built-in antenna tuner. I'm pretty sure I understand how to operate the radio, for the most part. ...
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I'm 99.9% certain that this will be OK, but independent verification would be reassuring.
I am an "Intermediate" licence holder in the UK. This means that I am authorised to design and build my own ...
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I bought a FE-5650A rubidium standard reference from eBay in the hope I can readily use it:
https://www.ebay.com/itm/142361240786
Unfortunately this is far from "reasily useable".
First and ...
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Greatest hits from previous weeks:
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I have a few walkie talkies at home and sometimes I connect my UV-5R to them to talk to them and act as another walkie talkie. At one time, I built a little simplex repeater out of it. Should I not be ...
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I have seen the following formulas for calculating half and quarter wavelength antennas:
Formula for $\frac{1}{2}$-wavelength antenna (in free space):
\begin{equation}
\mathrm{Length~(feet)} = ...
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I've been a ham for over 40 years, but never has there been such a prolonged period of such poor propagation. This has been especially the case over the past six months or so, and they continue to ...
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I don't have $500 for a radio scanner. If I know the few (analog) frequencies that I would like to listen to, I think one can use the Baofeng UV5R (which doesn't cost much). The only problem is that ...
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"When I was in high school, we had 8 hams at once. (Probably rare) 4
of us built little 10 meter walkie-talkies and had great fun using
them on Field Day, hiking or around town. It was ...
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I am trying to decide whether or not I should use a CTCSS (Continuous Tone-Coded Squelch System) or a DCS (Digital Coded Squelch) for my mini repeater I just set up.
What are the advantages of using ...
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I know that the front-to-back ratio is 18dB in the below antenna radiation pattern diagram, but I don't know how to read the diagram to obtain this result. How does one read and understand such ...
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