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Questions tagged [ssb]

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

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

As a relatively new ham operator, I understand that it is customary to use lower-sideband below 10 MHz and upper-side band above 10Mhz when operating single-sideband HF. I'm curious how we got to such ...
BenSwayne's user avatar
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16 votes
2 answers
4k 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" ...
Bryson's user avatar
  • 263
16 votes
3 answers
3k 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 ...
Skyler 440's user avatar
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12 votes
2 answers
2k 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 ...
Adam Davis's user avatar
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11 votes
4 answers
436 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 ...
Adam Davis's user avatar
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11 votes
4 answers
783 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 ...
Kevin Reid AG6YO's user avatar
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11 votes
1 answer
914 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 ...
Axel H.'s user avatar
  • 135
9 votes
4 answers
2k 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 ...
Axel's user avatar
  • 145
8 votes
3 answers
12k 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 ...
hellojoshhhy's user avatar
8 votes
2 answers
3k views

How does signal strength relate to bandwidth?

Let's say I have a 25 W transmitter. First I transmit some SSB signal with 2500 Hz bandwidth (no audio compressor is used, etc...). Then I transmit a BPSK31 signal with at most 100 Hz bandwidth using ...
Aleksander Alekseev - R2AUK's user avatar
8 votes
3 answers
5k 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 ...
natevw - AF7TB's user avatar
8 votes
4 answers
850 views

Required SSB sideband and carrier suppression?

Is there a legal (U.S. FCC) or a commonly accepted standard requirement for SSB opposite sideband and and carrier suppression for either manufactured or kit built transmitters? Does the 43+ dB down ...
hotpaw2's user avatar
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7 votes
2 answers
165 views

HF SSB etiquette when someone is working quick but not contesting and you're not sure they got you?

When someone is working quickly -- clearly trying to work a lot of stations -- but pretty clearly isn't contesting, what's the etiquette when they 73 you and end the contact but you're not sure they ...
QuantumMechanic's user avatar
6 votes
2 answers
8k views

What does ALC do on a transceiver?

What is ALC on an HF transceiver? What are the disadvantages (if any) of operating using a rig without ALC? What might be the difference between a good and bad implementation of ALC?
hotpaw2's user avatar
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6 votes
2 answers
321 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 ...
hotpaw2's user avatar
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5 votes
5 answers
771 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.
Axel's user avatar
  • 145
5 votes
2 answers
563 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 ...
hotpaw2's user avatar
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5 votes
2 answers
2k 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 ...
Oliver Hankeln's user avatar
5 votes
6 answers
600 views

How does single sideband work theoretically?

How does single-sideband (SSB) work theoretically? If a theoretical SSB transceiver is a "black box" and only its inputs and outputs can be analyzed, not the way it works internally, what is ...
kj7rrv's user avatar
  • 179
4 votes
2 answers
644 views

Does the output of a BFO for a short wave receiver have to be exactly a sine wave?

I want to build an external beat frequency oscillator (BFO) for an old valve Eddystone receiver I have. There are many circuits for BFOs on the internet, they are mostly similar, the idea seems simple ...
Andrew's user avatar
  • 3,683
4 votes
2 answers
441 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 ...
Harry Weston's user avatar
4 votes
3 answers
2k 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 ...
Plutonium smuggler's user avatar
4 votes
3 answers
373 views

Why is analog TV vestigal side band and not SSB?

Analog TV signals have one sideband cut off to reduce their (very wide) bandwidth and save frequency space in the ether. The lower sideband is cut off, but not completely, the lower 1.25 MHz is kept ...
JanKanis's user avatar
  • 405
4 votes
6 answers
134 views

Do changing sidebands have their own sidebands?

An amplitude changing carrier wave causes sidebands to appear next to it when viewed in the frequency domain. But if those sidebands themselves also change with time (because the modulating signal is ...
JanKanis's user avatar
  • 405
4 votes
1 answer
213 views

What is the etiquette for answering real world, non-contest HF SSB calls?

I'm a new ham (licensed back in the spring) and very new to HF (only a couple of weeks). One thing I've noticed in the phone bands is that things seem to rarely go the way all the articles aimed at ...
QuantumMechanic's user avatar
4 votes
1 answer
399 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 ...
PearsonArtPhoto's user avatar
4 votes
1 answer
162 views

SSB Single Conversion Superhet 2nd Mixer IF Termination on Transmit

I have a question about "best practice" in regards to how the 2nd mixer IF port is coupled to (in my case) a 20m double tuned filter on transmit. I'm currently building out the transmit ...
Buck8pe's user avatar
  • 989
3 votes
6 answers
3k 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 ...
Skyler 440's user avatar
  • 7,600
3 votes
2 answers
848 views

SSB Transceiver Architecture - USB with Crystal Filter

I'm planning to build a 20m SSB transceiver and I want to get the overall architecture straight in my head first. Here's what I'm thinking so far, a single conversion superhet design with a 9MHz IF ...
Buck8pe's user avatar
  • 989
3 votes
2 answers
2k 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, ...
rcampbell's user avatar
  • 213
3 votes
1 answer
119 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,...
Skyler 440's user avatar
  • 7,600
3 votes
3 answers
992 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 ...
EEd's user avatar
  • 552
3 votes
1 answer
345 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 ...
s3c's user avatar
  • 837
3 votes
1 answer
245 views

How can i adjust the IF strip in a single conversion SSB receiver which has a product detector?

I have an analog 27 MHz transceiver which i am planning to convert to 10 m. The radio is an AM / SSB unit with a single conversion superhet receiver with an IF of 7.8 MHz using a crystal filter. This ...
Andrew's user avatar
  • 3,683
3 votes
1 answer
259 views

How to balance a mixer?

I have read about double-balanced mixers and as far as I got the theory right they should suppress carrier frequency. I am trying to build my own transceiver project and I cannot suppress the carrier. ...
k1zmt's user avatar
  • 337
3 votes
1 answer
145 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 ...
Anjana Verma's user avatar
2 votes
4 answers
663 views

What's the realistic SSB reception range for 25W on 20m and 40m?

Because of my living situation I am using a Par EndFedz Mk II Trail Friendly antenna with my IC-7300, since it can do 40m and 20m and is only 41 feet long. However, it can only handle 25W. Now, for ...
QuantumMechanic's user avatar
2 votes
2 answers
2k views

SSB Generation. 4th method?

The mode of SSB is alive and well. It has relevance for long-distance comms and does not waste spectrum. The orthodox methods of generation are Filter, Phasing and Weaver. These methods can be and are ...
Autistic's user avatar
  • 469
2 votes
2 answers
332 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 ...
hotpaw2's user avatar
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2 votes
2 answers
298 views

What's the difference between LPF and BPF in context of bandwidth setting?

I'm used to simple RX/TX bandwidth configurations, on my VHF FM rig it's either narrow, normal, or wide. It seems to be much more complex on my new HF SDR rig, and the instructions don't say anything ...
rcx935's user avatar
  • 411
2 votes
1 answer
121 views

Is there a way to get FreeDV output level to follow the input audio amplitude?

I'm using a commonly available imbedded firmware implementation of FreeDV with an SSB HF transceiver. It seems that FreeDV encodes the input audio signal in both the frequency and time domains, ...
Andrew's user avatar
  • 3,683
2 votes
2 answers
2k views

Why does a Class-C non-linear power amp distort SSB but does not distort AM?

Can someone tell me why exactly a transistor non-linear power amplifier will amplify an AM signal without noticeable distortion, but will distort an SSB signal, giving the familiar scratchy sound ...
Andrew's user avatar
  • 3,683
2 votes
2 answers
232 views

What simple methods are available to test a homebrew SSB transceiver on transmit?

Overview Before putting my recently completed homebrew single conversion 20m mono-bander on the air, I borrowed another radio to listen to the transmission and make sure everything was OK. It turns ...
Buck8pe's user avatar
  • 989
2 votes
2 answers
85 views

Effect of frequency division on a signal's spectrum [closed]

I am constantly on the lookout for effective yet inexpensive means to generate SSB signals. Analog Devices' LTC5598 Direct Quadrature Modulator turns baseband analog I/Q signals into RF from 5MHz to 1....
Brian K1LI's user avatar
  • 7,858
2 votes
1 answer
280 views

How does this circuit work? Why is the antenna connected to the output of the amplification stage?

What is the function of the configuration of R1, C3,C10 and R3? How does the LC tank in this circuit work?
Delmer Lopez's user avatar
2 votes
1 answer
84 views

How can i convert a modulated DSB-SC signal to a SSB-SC signal?

I am designing a simple transmitter using an SI5351A to generate the carrier, then modulating it with a diode ring modulator to generate a dsb-sc signal, then somehow converting it to ssb modulated ...
I_like_python's user avatar
2 votes
1 answer
2k 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 ...
Adam Davis's user avatar
  • 12.1k
1 vote
2 answers
479 views

How can I check if my CB radio is AM or AM/SSB?

How can I check if my CB radio is AM or AM/SSB? I know that it is a CB UHF radio but there is no information of whether it is AM or AM/SSB.
S.Allen's user avatar
  • 11
1 vote
2 answers
203 views

What are the practical differences between the different voice modes (and why aren't there any SSB Handheld Transceivers (HT's))?

It's my understanding that FM is used for UHF, VHF, and SSB is generally reserved for other bands. From my understanding, FM better audio quality when reception is good SSB: more efficient (can ...
user avatar
1 vote
3 answers
1k views

LSB modulation and demodulation

A USB signal is basically a baseband signal shifted up in frequency. However, an LSB signal is the mirror image of a baseband signal then shifted up in frequency. How is this 'mirroring' modulation ...
Olsonist's user avatar
  • 111