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In literature about the instrumentation of radio astronomy, I frequently come across a type of mixer described as "2SB". I'm familiar with single-sideband (SSB) and double-sideband (DSB) mixers, but I have never studied a 2SB mixer.

What is a 2SB mixer and how does it compare to a DSB mixer? Ideally, I would also like to know of formal references that directly address the topic for further reading.

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  • $\begingroup$ the answer to What would a “crystal mixer” have been in an 1960's radio telescope at 960 MHz? remarks that the IF bandpass is quite wide and reasonably speculates that this is related to maintaining a flat phase response for this interferometric radio telescope. Since the IF is centered on the frequency difference, I assume both sidebands are passed. $\endgroup$ – uhoh Aug 15 '20 at 7:20
  • $\begingroup$ I don't know if this is officially a Dual Sideband or a Double Sideband or something else, partly because the accepted answer doesn't actually say anything about what those mean nor what the difference is between. $\endgroup$ – uhoh Aug 15 '20 at 7:20
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2SB is Dual Sideband, as opposed to DSB - Double Sideband. Here are a couple of papers you might find relevant and interesting:

a 2SB upgrade replacing a DSB

a paper that mentions the advantages of 2SB over DSB

Answers to What is the functional difference between DSB and 2SB mixers, and why exactly would 2SB be better for radio astronomy? in Signal Processing SE go into further detail.

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    $\begingroup$ Wow, this is a bit of a blast from the past. You are right, I could have answered that better. Six years on I'm feeling a bit of a lack of motivation to address it, but if you have suggestions for edits of the answer I am happy to work with them. Or feel free to add your own answer to improve on this one $\endgroup$ – Jeremy Aug 16 '20 at 22:40
  • $\begingroup$ OK, I don't know what the policy is on pointing to answers on other stack exchange subsites $\endgroup$ – Jeremy Aug 18 '20 at 0:45
  • $\begingroup$ Thanks for the update! I've made a small edit, I hope this is okay. $\endgroup$ – uhoh Aug 20 '20 at 1:49

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