{"id":3076,"date":"2023-03-18T19:38:00","date_gmt":"2023-03-18T08:38:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2023\/03\/18\/the-islander-a-homebrew-dsb-rig-from-cuba\/"},"modified":"2025-07-22T18:02:25","modified_gmt":"2025-07-22T08:02:25","slug":"the-islander-a-homebrew-dsb-rig-from-cuba","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2023\/03\/18\/the-islander-a-homebrew-dsb-rig-from-cuba\/","title":{"rendered":"The Islander — A Homebrew DSB Rig from Cuba"},"content":{"rendered":"<\/p>\n
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This article, the pictures, and the comments are all so cool. They really capture the spirit of homebrew. <\/b><\/i>Obviously we still need more information on the Islander and the Jaguey. If you have it, please send it to me and I will disseminate it via this blog. <\/b><\/i><\/div>\n

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From: https:\/\/www.frcuba.cu\/filiales-grupos\/villa-clara\/contra-el-olvido.html<\/a> with translation by Google. <\/b><\/i><\/div>\n

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I’ve been in touch by e-mail with Jose Campos CO6EC (the guy in the picture above). He sent me this partial schematic of the Islander (we still need the VFO circuit and the RF amplifier) . Thanks Jose! <\/b><\/i><\/div>\n
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<\/span>Views: 2274<\/span><\/b><\/div>\n
<\/span>Comments: 6<\/span><\/b><\/div>\n<\/div>\n
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Remembering<\/h1>\n
By Jos\u00e9 de Jes\u00fas Enr\u00edquez Campos (CO6EC)<\/span><\/b><\/div>\n

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Next 2019 will be the 30th anniversary of the first convention of radio amateurs in the province of Villa Clara, in Campismo de Ganuza, municipality of Corralillo, on the North coast, about 100 kilometers from Santa Clara, the provincial capital.<\/span>

This convention was held on a national basis and colleagues from all the country’s provinces participated at that time. <\/span>We did not reach a thousand members throughout the national territory and most of the radio amateurs worked in the 40-meter Band in Amplitude Modulation <\/span>Then the Lateral Side Band (SSB) was the privilege of a few and the 2 meters was something rare, which did not yet exist in our environment.<\/span><\/span>

At that meeting, a project for a Tube Transceiver was presented, quite simple, with just six vacuum tubes and a BF310 transistor. <\/span>It was possible to work in HF in Double Sideband, achieving a greater efficiency than the transmission in Modulated Amplitude (AM). <\/span>This project became known as the Islander.<\/span><\/span>

In only two printed plates, one for the VFO and another for the TX and RX part, which by the way were printed for distribution, in a company in Villa Clara, due to their easy construction and acquisition of the components (almost all of them came out of a Krin-218 TV), a large number of such equipment were manufactured by radio amateurs from all over the country. <\/span>Like everything made at home, it always comes up with a little problem that later is necessary with tinkering, correcting it.<\/span><\/span>

I remember listening to an old radio amateur from Havana (whose callsign I don’t remember) in a pleasant QSO with another colleague, who jokingly said, “… some “Bugs” have now appeared in the band, called Islander, which is worse than the invasion of the Vikings\u2026\u201d, which gives an idea of \u200b\u200bhow many were built at that time, when if you wanted to make radio, you had to manufacture it, something unusual in these times.<\/span>

As soon as we saw the project we decided to build it, because at that time we had an AM \u201ctransmitter\u201d with modulation by \u201cCarrier control\u201d with four tubes, a 12AX7 preamplifier; <\/span>an ECL82, as a modulator, with cathode output to the final tube Screen grid, a 6DQ6 and a 6BH6 as VFO; <\/span>and to receive, an old Russian receiver from World War II.<\/span><\/span>

We got involved in the construction and improvements of the project and we managed, with some changes, to improve its performance and quality, because among the modifications to the original, we added: <\/span><\/b><\/p>\n

-A switch, with which you could change the transmission mode<\/span> to DSB -CW-AM.<\/span>
-A “Pi” Filter at the input of the RX, which considerably improved its quality.<\/span>
-An automatic volume control, because since it did not have AGC (Automatic Gain Control), when someone nearby came on, it would break your speaker.<\/span>
-A filter for the microphone input, which improved the quality of the modulation.<\/span>
-A final power stage, with a 6146B, with 750 V on the board, for about 70 W of<\/span> output, taking advantage of the 6P15P as Driver.<\/span>
-The chassis was built from scratch using aluminum trays that were sold at the hardware store for \u201cfour pesos\u201d each and that were special for making cabinets for these purposes.<\/span>

After the construction was completed in one afternoon, with Reinaldo Mart\u00ednez Dom\u00ednguez (CO6UK), from Manicaragua, the balanced modulator was adjusted, since the good transmission of this type of equipment depends on the relationship between the amount of RF and audio that are mixed At that stage, it took us a long time to adjust, until Reinaldo with his expert ear told me, \u201cleave it there, don’t touch it, it’s 99% complete\u201d.<\/span>

There were many international contacts that I was able to make with this very simple equipment, with very good reports, many of them with Europe, the American continent, that was very normal, since the propagation conditions in those years had nothing to do with the today, you could do half the world in AM, with about 100 W.<\/span>

Many colleagues at that time asked me what equipment I was using. When I told them it was an Islander, they asked me to send them the plans of the improvements made, they were many modified plans, mimeographed.<\/span>

Perhaps the youngest do not know what that was and the photos taken by colleague Joel (CO6JC) that helped to illustrate the distribution of the components in the chassis, were sent to radio amateurs from the different provinces, in the interest of contributing modestly to migrate from AM to the Double Side Band, today it is a rarity to listen to someone on AM, there are already few who appear in Double Side Band, which shows that we have developed in these almost 30 years, despite the difficulties, which We went from just under a thousand to about 8,000 throughout the country today.<\/span>

From time to time, a colleague in the 40 meter Band, from another province, has told me that he still keeps the plans and photos that were sent to him at that time, or as “Kike” (CO6GO) that he still has a Islander as a relic.<\/span>

Ours passed away a long time ago and part of its components went to other projects, thanks to Joel (CO6JC) there is a graphic record of it, and that at that time I had hair, which I have lost in these bustles.<\/span>

With this brief comment, we only want the new generations to know what radio amateurs were like in those days and the older ones to remember it.<\/span>

Nothing, to remember is to live again.<\/span>

Here he left you some images.<\/span><\/b><\/p>\n<\/div>\n<\/div>\n


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