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5 votes

Is a vertical noisier than a dipole, and if so, why?

I live in Seoul, Korea, a city of 15 million, with lots of lights and electronics on late until 11pm. My vertical dipoles I have created are easily 1 to 3 s-units noisier than horizontal dipoles. ...
Derek HL1ZIX's user avatar
4 votes
Accepted

How big is a decibel?

Here are some visual examples, corresponding to what you'd see receiving an analog TV transmission. I've picked an image with features of varying detail. Look for: the letters "IPI" individual jelly ...
Phil Frost - W8II's user avatar
4 votes
Accepted

Are there any terrestrial timecode signals receivable in Boston Massachusetts?

WWVB propagation does vary in amplitude. And its BPSK phase modulation makes it a bit tricky to lock to. But if you narrow the bandwidth enough, signal is most always above the noise. Here's an ...
glen_geek's user avatar
  • 941
1 vote

SNR measurement for a BPSK/QPSK signal

FLDigi will calculate the SNR for a PSK31 signal based on the spectrum scope.
Cecil - W5DXP's user avatar
1 vote

Are there any terrestrial timecode signals receivable in Boston Massachusetts?

Apart from the American time signal stations on shortwave. There is also CHU the Canadian time signal from Ottawa on 3.330 MHz, 7.850 MHz, and 14.670 MHz using USB mode.
Old_Fossil's user avatar
1 vote

Are there any terrestrial timecode signals receivable in Boston Massachusetts?

You should be able to pick up WWVB at 60 kHz, or WWV at 2.5, 5, 10, 15, and 20 MHz. Propagation should allow you to routinely receive at 60 kHz, 2.5 MHz, and 5 MHz most nights unless the ionosphere ...
rclocher3's user avatar
  • 9,242
1 vote

Use noise figure and gain to calculate weakest signal radio can receive?

Phil's answer is sound from a technical perspective since there is not sufficient data to fully answer the question. From a more pragmatic perspective, if you wish to increase the 12 dB SINAD ...
Glenn W9IQ's user avatar
  • 18.6k
1 vote

Is the error rate for QPSK31 in a white noise channel worse than BPSK31?

Your reasoning is correct: in principle, given identical bit rate and signal power, the BER for BPSK and QPSK are identical. The Wikipedia article on PSK puts it nicely. The author there points out ...
Rodney Price's user avatar
1 vote

How big is a decibel?

A decibel is a mathematical measurement of the change in the magnitude of a quantity. It uses a logarithmic scale so that a change of 10 db is an increase of 10 times, while a change of 20 db is an ...
nmb's user avatar
  • 49
1 vote

How big is a decibel?

If your transceiver has an S-meter, one "S" has 6dB. Is decibel small? In my sense, yes, dB is quite small: it is difficult to hear a change of 1-5dB in voice quality. A 5-10dB change is significant,...
Jacek Cz's user avatar
  • 131
1 vote

Is a vertical noisier than a dipole, and if so, why?

I'd like to corroborate one of the other anecdotal answers: my vertical is both extremely sensitive and noisy. It picks up all kinds of noise from my suburban neighborhood, even with my entire house ...
aaronsuperglue's user avatar
1 vote

Can I reduce RFI/noise at the antenna?

To lower the incoming noise on a dipole antenna, connect a ground wire to the coax fitting at the antenna base. Run it to a ground rod and enjoy hearing stations that were covered up before. This does ...
user8264's user avatar

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