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Questions tagged [ssb]

Single Side Band - Amplitude Modulated signals transmitted using only one side band, often with suppressed carrier.

5
votes
3answers
95 views

What exactly is a “balanced modulator”?

While studying for his U.S. General class license, my son wondered about the "balanced modulator" referred to by a few questions in the FCC pool. Quoting KB6NU's General Class study guide to give a ...
1
vote
2answers
76 views

Can an SSB transmitter be used to transmit PSK?

Can a generic/typical analog SSB transmitter be used to send PSK modulated digital signals? If so, how does that work? How is a computer or DSP interfaced with an SSB transmitter? Line level ...
3
votes
2answers
84 views

SSB filtering in the frequency domain?

I'm not sure whether it's more appropriate to ask this question here, or in the dsp.stackexchange. But I'll try here first. There seems to be a lot of information available on the filtering and ...
0
votes
2answers
41 views

SDR (RTL-SDR v3) USB audio much less than LSB

Why does USB have so much less audio output than LSB? I've checked all settings and they are correctly set or not used, like AGC etc. Using same band pass on both modes.
7
votes
2answers
124 views

SSB offset determination?

Is there any algorithmic way to determine if the mixed frequency offset in an SSB SDR demodulator is wrong (too high or low), other than listening for funny sounding voices? (perhaps by checking to ...
1
vote
1answer
278 views

SDR demodulation of SSB

Is there any difference between demodulating LSB versus USB in software from IQ samples other setting the complex mixer frequency (LO) below or above the SSB signal frequency? (and excluding any ...
3
votes
2answers
2k views

Single Side Band AM vs FM

I know the difference between AM and FM, but could anyone explain to me what is the differences between single side band AM and conventional FM? So far as I know the SSB modulation will reduce the ...
3
votes
2answers
371 views

WSPR RX dial frequency

I tried but failed to decode WSPR using Tecsun PL-600 receiver that tunes in 1KHz step. I heard tones with good SNR but cannot be decoded. So, I mis-set it somewhere. Is it correct that transmission ...
1
vote
1answer
131 views

SSB Modulation and Differential Signaling

I'm trying to learn about how SSB modulation works. My current understanding from reading and looking at spectrum plots from SDR software is that the sound is modulated with the carrier, but only ...
0
votes
2answers
540 views

SSB Generation. 4th method?

The mode of SSB is alive and well .It has relevence for long distance coms and does not waste spectrum .The orthodox methods of generation are Filter ,Phasing and Weaver .These methods can be and are ...
3
votes
2answers
870 views

In SSB how do receivers calculate the frequency offset without a carrier?

On page 2-9 of the ARRL Ham Radio License Manual, it discusses how in SSB one of the side bands and the carrier are suppressed to conserve power and bandwidth. Given the explanation of how AM works, ...
4
votes
2answers
269 views

Is this simple description of SSB correct?

I was recently asked to explain why a "carrier injection oscillator", or CIO is needed in an SSB receiver but not in a transmitter. This is the explanation I gave, and I would be grateful for comments ...
7
votes
1answer
247 views

Why does AM have sidebands?

Why does AM have sidebands? Isn't the whole point of AM to broadcast on ONE frequency and ONLY change the amplitude? In the picture there is only ONE frequency and the amplitude changes, so why ...
5
votes
5answers
332 views

Why needs a carrier signal on receiver (SSB)

why does the receiver needs to add a carrier signal to the SSB signal? I am new to ham radio and can't so much.
7
votes
4answers
711 views

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 ...
8
votes
4answers
323 views

Is there a convention for SSB frequency selection?

I know that the amateur bands are not channelized. I know that anyone can pick an arbitrary frequency and they're not wrong, and you are not obligated to have a calibrated VFO. But if everyone picks ...
3
votes
2answers
1k views

What is an cheap and easy to build kit for a sw ssb transceiver? [closed]

I have a licence since I was 14 which is exactly half of my life, but honestly with the advent of the internet I somehow lost interest and sold my equipment. Now I really start to think, I should ...
9
votes
2answers
1k views

How does selecting the opposite sideband when receiving CW on HF reduce interference?

I am studying for my FCC General Class license, and question/answer G4A02 reads as follows: Q: What is one advantage of selecting the opposite or "reverse" ...
3
votes
6answers
1k views

Would it be feasible to set up a SSB or AM 2 meter repeater?

Would it be feasible to set up a SSB or AM 2 meter repeater? I want to set up an AllStar full duplex node and like the idea of AM because stations can double without issues. SSB works for weaker ...
3
votes
1answer
110 views

Power efficiency of SSB-Large carrier

i was studying SSB demodulation and learned that a carrier is added to the SSB signal to make sure that envelope detection is possible. I came across a problem to find the percentage of power saved in ...
3
votes
1answer
209 views

SSB modulation image rejection

I'm trying to figure out how SSB transmitters manage to get rid of the images created when mixing up audio frequencies. For example, when mixing a 1KHz signal with a 7MHz one you will end up with two ...
3
votes
1answer
104 views

Up converted audio transmission

I was thinking about all the different modulation methods and something came to my head. After seeing up converters that convert HF to VHF for SDR (software defined radio) dongles to be able to listen,...
4
votes
3answers
956 views

SSB demodulation

I was building the superhet receiver for ham radio. But I seem to have got stuck at the demodulation stage. As an example: Suppose the person is transmitting SSB signal (20m band) at 14.250 MHz ...
3
votes
1answer
225 views

For Linear Transponder satellites, do I transmit on USB or LSB?

I'm in charge of our Field Day satellite communication, and I'm going to try and do this via SSB on one of the SSB satellites. I know they invert the signal, but is the convention to transmit on USB ...
16
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2answers
2k views

Why do we use LSB below 10Mhz and USB above 10Mhz when operating SSB HF?

As a relatively new ham operator, I understand that it is customary to use lower-sideband below 10Mhz and upper-side band above 10Mhz when operating single-sideband HF. I'm curious how we got to such ...
10
votes
4answers
177 views

How do I increase my phone intelligibility?

Listening to various operators at different times, I've sometimes noticed, especially during contests, that some operators are easier to understand than others, and it doesn't all seem to be due to ...
10
votes
2answers
526 views

What does a SSB frequency actually indicate?

An SSB signal is an AM signal with the carrier and other sideband filtered out, if I understand correctly. As such, when specifying an SSB frequency do you specify the carrier frequency, then state ...
2
votes
1answer
1k views

Homebrew 20M SSB receiver design? [closed]

I'm looking for as simple as possible homebrew 20M SSB receiver design. I just want to start listening, but at the same time learn some radio fundamentals. So rather than buying a shortwave receiver ...
12
votes
3answers
1k views

Why does SSB have the hollow voice sound?

When I listen to SSB, it has the very familiar tunnel-voice sound. What properties make it sound like this? With a Carrier and an extra sideband as AM, I don't hear the tunnel-effect at all. Is there ...