{"id":4081,"date":"2022-07-02T13:02:00","date_gmt":"2022-07-02T03:02:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2022\/07\/02\/a-double-sideband-transmitter-from-france-f4iets-master-robert\/"},"modified":"2025-07-22T18:03:27","modified_gmt":"2025-07-22T08:03:27","slug":"a-double-sideband-transmitter-from-france-f4iets-master-robert","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2022\/07\/02\/a-double-sideband-transmitter-from-france-f4iets-master-robert\/","title":{"rendered":"A Double Sideband Transmitter from France — F4IET’s “Master Robert”"},"content":{"rendered":"<\/p>\n
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The Radio Gods seem to be steering us toward Double Sideband. A few days ago I got an e-mail from Alain F4IET. We had him on the SolderSmoke blog two years ago<\/a>, talking about his French backyard pandemic Field Day. His recent e-mail reminded me of his very fine homebrew DSB transmitter, which is his only rig and with which he has worked the world. <\/b><\/div>\n

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The rig is named for the fellow — Robert F6EUZ — who is Alain’s teacher from the local radio club. <\/b><\/div>\n

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Alain’s rig was shown to the world in the G-QRP club’s Winter 2020 issue of SPRAT (SPRAT 185). Once again, let me note: If you are not subscribing to SPRAT, you are just WRONG. Join G-QRP and start receiving SPRAT: http:\/\/www.gqrp.com\/join.htm<\/a><\/b><\/div>\n

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Alain gives some nice shout-outs to Pete N6QW, Charlie ZL2CTM, and Basanta VU2NIL, all of whom provided advice and counsel on this project. So think about it: the Master Robert rig was built in France under the guidance of a French Elmer, with advice from hams in the U.S., New Zealand, and India, and was featured in journal of the British QRP club. That, my friends is the International Brotherhood at its best. <\/b><\/div>\n

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As I read about Alain’s rig, I found myself thinking about the Direct Conversion receiver projects underway around the world. The Vienna Wireless Society’s Maker Group, is, for example, building a simple DC receiver.<\/a> It would be relatively easy to pair up a rig like the Master Robert with a DC receiver (the VFO could be the only stage common to both transmit and receive) to make a simple phone transceiver. That kind of rig was my first phone transceiver. Alain reports that he is currently working on a second version of the Master Robert. It will be a transmitter-receiver (TRX) and will be used in SOTA operations. <\/b><\/div>\n

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Alain’s description of his transmitter is a lot of fun: http:\/\/www.f4iet.fr\/mdwiki\/#!master_robert.md<\/a><\/b><\/div>\n
I especially liked his comment about how the other phone stations never knew he was on DSB: http:\/\/www.f4iet.fr\/mdwiki\/#!dsb.md<\/a> I had similar experiences out in the Azores with my DSB rigs. <\/b><\/div>\n

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Here is Alain’s main page: <\/b>http:\/\/www.f4iet.fr\/mdwiki\/#!index.md<\/b><\/a><\/div>\n
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Alain’s QRZ.com page: https:\/\/www.qrz.com\/db\/F4IET<\/a><\/b><\/div>\n
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Here is the Master Robert schematic from GQRP: http:\/\/www.gqrp.com\/Maestro_Robert_Cct.pdf<\/a><\/b><\/div>\n
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Here is a link to the 76 DSB posts on the SolderSmoke blog (keep scrolling down!): <\/b><\/div>\n
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https:\/\/soldersmoke.blogspot.com\/search\/label\/DSB<\/a><\/b><\/div>\n<\/div>\n

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The Radio Gods seem to be steering us toward Double Sideband. A few days ago I got an e-mail from Alain F4IET. We had him on the SolderSmoke blog two years ago, talking about his French backyard pandemic Field Day. His recent e-mail reminded me of his very fine homebrew DSB transmitter, which is his … Continue reading “A Double Sideband Transmitter from France — F4IET’s “Master Robert””<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":4082,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33,227,68,41,103,350,324],"tags":[],"class_list":["post-4081","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dsb","category-france","category-india","category-juliano-pete","category-knack-stories","category-morris-charlie","category-sota"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/4081","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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=4081"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/4081\/revisions"}],"predecessor-version":[{"id":4083,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/4081\/revisions\/4083"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/4082"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=4081"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=4081"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=4081"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}