Questions tagged [ssb]
Single Side Band - Amplitude Modulated signals transmitted using only one side band, often with suppressed carrier.
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DX-70 Sideband leakage
My radio Alinco DX-70 transmits on both USB and LSB, when I set it to transmit on USB. Signal is visible in USB as well as in LSB, but signal strength is bit less in LSB. It appears that radio is ...
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Use of filters for weak SSB when there is no QRM
On bands like 10m when there is often little or no QRM (just gaussian noise), are the "Noise Reduction" filters intended to make weak phone signals more understandable? My subjective view is ...
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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 ...
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Transfer digital data over ham radio frequencies using QPSK modulation SSB-QPSK transmitter
If I use QPSK modulator/demodulator is it possible to transfer digital data over ham radio frequencies.
SSB-QPSK transmitter
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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 ...
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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 ...
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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 ...
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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 ...
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How does injecting a carrier allow a FM receiver to demodulate SSB?
I just watched VK3YE's video on demodulating SSB using a FM receiver. (https://www.youtube.com/watch?v=kJ-cj-YwflY)
In the video, he demonstrates that by transmitting a very weak CW carrier, the FM ...
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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 ...
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Is SSB and FM voice considered TDD or FDD (and what are TDD/FDD)?
We are looking at the Qorvo QPL9547 LNA and the datasheet notes:
For TDD Applications: R1 = 0Ω & R2 = 100K
For FDD Applications: R2 = 100K ‘OR’ Pin 6 tied to ground. R1 = DNP/Omitted
This will ...
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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.
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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 ...
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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 ...
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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 ...
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