{"id":10781,"date":"2012-09-26T09:12:00","date_gmt":"2012-09-25T23:12:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2012\/09\/26\/ssb-generation-ideas-from-around-the-world\/"},"modified":"2025-07-22T05:06:25","modified_gmt":"2025-07-21T19:06:25","slug":"ssb-generation-ideas-from-around-the-world","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2012\/09\/26\/ssb-generation-ideas-from-around-the-world\/","title":{"rendered":"SSB Generation: Ideas from Around the World"},"content":{"rendered":"
<\/a><\/div>\n


<\/span> I liked this thread on the EMRFD mailing list. The question of how best to generate SSB is very interesting, and I also liked the global scope of the Q&A: Peter in Hungary asks the question, Farhan in India and Allison in the U.S. respond. <\/b><\/span>

<\/b><\/span> On 9\/25\/12, ha5rxz wrote:<\/ha5rxz><\/span>
When generating an SSB signal from audio and a 9 MHz carrier which would be<\/span>
the best mixer to use?<\/span>
a) A high-level ring bridge mixer such as the SRA-1H<\/span>
b) An H-Mode mixer using an FST3125 chip<\/span>
c) An H-Mode mixer using a 74HC4016<\/span>
d) Something else<\/span>
Note that this mixer will not be used to demodulate.<\/span>
Peter HA5RXZ<\/span><\/b>
……………………………..<\/b><\/span>
Ashhar Farhan wrote:<\/farhanbox><\/span>
In my experience, if you keep the audio level low enough, it is<\/span>
difficult to beat a simple two diode mixer.with a 10 db attenuator in<\/span>
the output. Having just two diodes makes balancing of reactive as well<\/span>
as resistive differences of the two diodes quite trivial. Schottky<\/span>
diodes are best.<\/span>
One thing, I did discover though is that the balance should be to<\/span>
minimize the harmonic distortion, rather than just the carrier<\/span>
suppression.<\/span>
What we are shooting for is to keep the In-band IMD down. Carrier<\/span>
suppression is just hygiene. So, you will want to tune in to the<\/span>
signal, modulating it with two tones and see it on a audio spectrum<\/span>
analyzer (freely downloadable from the net) and try getting the third<\/span>
spike down.<\/span>
Though the ‘packaged’ mixers don’t give you the needed control for<\/span>
hi-fidelity, for trivial usage, NE602 is pretty good. Just drop it<\/span>
into the rig and live with what you get (which is not bad at all).<\/span>
The best resource is the chapter on phasing receivers and transmitters<\/span>
in emrfd. Rick is the guru. I hope he joins this thread.<\/span>
<\/span>
– Farhan<\/span><\/b>
……………………………………..<\/b><\/span>
FROM KB1GMX: <\/b><\/span>

<\/b><\/span> I’ll weigh in..<\/span>

Yes, they all work. You need a provision for adjusting carrier balance on some but anything over 40db will be good.<\/span>

I’ve used 602\/612s, SBL-1, SBL-1H, diode rings, and even varicap<\/span>
diodes (there is a design using them in capacitively balanced <\/span>
a modulator from many years ago. They all work if the levels are correct.<\/span>

These days I use the sa612 for simple designs, SBL-1 with a 50ohm <\/span>
pot added for balance for better radios and the 4 diode ring I’ve <\/span>
used many times as its uncritical, needs only one untapped <\/span>
transformer and easy to make. Most of those are listed in the <\/span>
older 1975 through current handbooks and EMDRFD.<\/span>

If needed I can post to the files section a few designs but <\/span>
they are all textbook and all are capable of good results.<\/span>
In just about all the diode modulator cases a fairly strong <\/span>
carrier (5mW or more) is needed and the audio will be about <\/span>
10db lower for very good result. The active devices like the<\/span>
ca3028(and friends), SA612, MC1496 the levels for the carrier <\/span>
and audio must be matched accordingly for the device. You can <\/span>
look at the output with a scope and get a first order eyeball <\/span>
call on quality (no carrier and no clipping or limiting) and a<\/span>
receiver (any your ears) will tell you if its right.<\/span>

Allison<\/span><\/b><\/p>\n

Our book: “SolderSmoke — Global Adventures in Wireless Electronics” http:\/\/soldersmoke.com\/book.htm<\/a> Our coffee mugs, T-Shirts, bumper stickers: http:\/\/www.cafepress.com\/SolderSmoke<\/a> Our Book Store: http:\/\/astore.amazon.com\/contracross-20<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

I liked this thread on the EMRFD mailing list. The question of how best to generate SSB is very interesting, and I also liked the global scope of the Q&A: Peter in Hungary asks the question, Farhan in India and Allison in the U.S. respond. On 9\/25\/12, ha5rxz wrote:When generating an SSB signal from audio … Continue reading “SSB Generation: Ideas from Around the World”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":10782,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[66,189,34,23],"tags":[],"class_list":["post-10781","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-farhan","category-hungary","category-mixer-theory","category-ssb"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/10781","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=10781"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/10781\/revisions"}],"predecessor-version":[{"id":10783,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/10781\/revisions\/10783"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/10782"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=10781"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=10781"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=10781"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}