{"id":4413,"date":"2016-07-12T20:51:41","date_gmt":"2016-07-12T15:21:41","guid":{"rendered":"http:\/\/nuclearrambo.com\/wordpress\/?p=4413"},"modified":"2024-10-04T13:15:01","modified_gmt":"2024-10-04T07:45:01","slug":"dra818v-vhf-band-transceiver","status":"publish","type":"post","link":"https:\/\/nuclearrambo.com\/wordpress\/dra818v-vhf-band-transceiver\/","title":{"rendered":"DRA818V VHF band transceiver &#8211; Part 1"},"content":{"rendered":"\n<p>Necessity to stay connected with others is growing by the day. In cases when mobile network is out of reach and a message needs to be relayed or received, ham radio can prove to be quite helpful. Let us not get into the details as to why I am making this ham radio transceiver. The purpose of this post is to get into the technical aspect of it.<\/p>\n\n\n\n<p>There is a chip for every purpose these days. The RDA1846 has everything that is needed for transmitting and receiving a VHF band frequency modulated signal. It has amazing sensitivity that goes all the way down to -120dBm, it can pump out 1W of RF power and it does Frequency modulation. The same RDA1846 goes inside the DRA818V module. It needs AF (audio) input and it gives AF output which can be fed into the speakers. The frequency at which the module needs to tune itself is set over a UART port with the help of AT commands.<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><img decoding=\"async\" src=\"https:\/\/i.gyazo.com\/ee3ae1addd1bbfe536a9de87970c5e56.png\" alt=\"RDA1846 DRA818V\"\/><figcaption class=\"wp-element-caption\">Block diagram of RDA1846<\/figcaption><\/figure>\n\n\n\n<p>RDA1846 is such an amazing chip. It has an RF front end with Low noise amplifier, I\/Q mixers, two ADCs, and further down the line is a DSP core that does the job of frequency modulation and demodulation. Apart from that, there is an integrated frequency synthesizer that acts as a local oscillator for the mixers. We cannot forget about the 30dBm Power amplifier that draws a great deal of current while transmitting. It is just too much to go on about the internals of the chip and I will let you <a href=\"http:\/\/blog.nutsfactory.net\/wp-content\/uploads\/2014\/05\/RDA1846.pdf\">read the datasheet<\/a> in that case.<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><a href=\"http:\/\/nuclearrambo.com\/wordpress\/dra818v-vhf-band-transceiver\/img_20160514_223020\/\" rel=\"attachment wp-att-4415\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"http:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/05\/IMG_20160514_223020-768x1024.jpg\" alt=\"DRA818V modules\" class=\"wp-image-4415\" srcset=\"https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/05\/IMG_20160514_223020-768x1024.jpg 768w, https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/05\/IMG_20160514_223020-225x300.jpg 225w, https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/05\/IMG_20160514_223020-576x768.jpg 576w, https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/05\/IMG_20160514_223020-810x1080.jpg 810w, https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/05\/IMG_20160514_223020-1350x1800.jpg 1350w, https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/05\/IMG_20160514_223020-600x800.jpg 600w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><figcaption class=\"wp-element-caption\">A couple of DRA818V modules<\/figcaption><\/figure>\n\n\n\n<p>Getting the chip up and running is our first task at hand. A simple PCB containing a microphone amplifier and an audio amplifier is all that we need to build. We will also need to bring out a few pins on the header which will be useful for sending commands from the UART port.<\/p>\n\n\n\n<center><p><script type=\"text\/javascript\">\n\tatOptions = {\n\t\t'key' : 'a488f095e80c8a74746e5fdca977eaea',\n\t\t'format' : 'iframe',\n\t\t'height' : 90,\n\t\t'width' : 728,\n\t\t'params' : {}\n\t};\n\tdocument.write('<scr' + 'ipt type=\"text\/javascript\" src=\"http' + (location.protocol === 'https:' ? 's' : '') + ':\/\/www.profitabledisplaynetwork.com\/a488f095e80c8a74746e5fdca977eaea\/invoke.js\"><\/scr' + 'ipt>');\n<\/script><\/p><\/center>\n\n\n\n<h2 class=\"wp-block-heading\">Gathering information for our first PCB prototype<\/h2>\n\n\n\n<p>This part is quite easy as the datasheet is quite to-the-point and short. DRA818V has a UART interface over which we need to send commands for the module which in turn modifies the frequency it is tuned to, the AF output volume level, AF filter settings and as such.<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><img decoding=\"async\" src=\"https:\/\/i.gyazo.com\/3642a68264692c0b3d71abc1a55052f0.png\" alt=\"DRA818V schematic\"\/><figcaption class=\"wp-element-caption\">DRA818V<\/figcaption><\/figure>\n\n\n\n<p>DRA818V operates at 3.3V and may be powered up with a maximum of 4.5V. There are a couple of pins that need to be tied to 3.3V or Ground to get the module working. First one is the PTT (Push to Talk)(Pin 5) pin which when left floating will put the module in Transmit mode whereas, tying it to ground will switch it over to Receive mode. We need it to be in Receive mode by default and needs to be pulled to ground (0V) when we intend to transmit voice. A simple tactile switch does this job for us.<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><img decoding=\"async\" src=\"https:\/\/i.gyazo.com\/00c0958efebf4748833c2aae7ba16ef3.png\" alt=\"Push to talk\"\/><figcaption class=\"wp-element-caption\">Push to talk<\/figcaption><\/figure>\n\n\n\n<p>The power down pin needs to be pulled high at 3.3V to keep the module working. A Squelch output goes high (3.3V) when signal is receive above certain power level. Connecting this pin to a LED will give us an indication of presence of signal. This Squelch line will also help us turn off the output audio amplifier when no signal is being received and this will help us save power.<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><img decoding=\"async\" src=\"https:\/\/i.gyazo.com\/a32bdf38c21aa1dacb41e2bc4da66ada.png\" alt=\"LM4871 audio amp\"\/><figcaption class=\"wp-element-caption\">Output audio amplifier with LM4871<\/figcaption><\/figure>\n\n\n\n<p>The input to the module is from a microphone amplifier built from a LM358 operational amplifier. Being powered from a single 5V supply, the input signal needs to be pushed and centred at 2.5V for preventing the negative peak from cutting off. The output of the amplifier is fed into the AF input of the DRA818V module.<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><img decoding=\"async\" src=\"https:\/\/i.gyazo.com\/076f145ee80730d0dfa65e50600be32b.png\" alt=\"LM358 microphone amplifier\"\/><figcaption class=\"wp-element-caption\">Microphone amplifier<\/figcaption><\/figure>\n\n\n\n<p>We are still missing a big part of the circuit. The RF circuit. The single major thing that is responsible for pumping the radio signal out and receiving the radio signal. DRA818V produces several other frequencies called harmonics while it transmits. The harmonics are resultant of the mixing process. These frequencies lie around center frequency and it can cause distortion on other bands. To prevent this from happening, a simple low pass filter does the job for us.<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><img decoding=\"async\" src=\"https:\/\/i.gyazo.com\/1c009c5667c54c400d36f25e702abae0.png\" alt=\"harmonic suppression filter\"\/><figcaption class=\"wp-element-caption\">Harmonic suppression filter<\/figcaption><\/figure>\n\n\n\n<p>With this done, I designed a PCB that looks like this.<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><img decoding=\"async\" src=\"https:\/\/i.gyazo.com\/79a586890bc87cca6d7b7423b8977a31.png\" alt=\"DRA818V PCB\"\/><figcaption class=\"wp-element-caption\">DRA818V PCB<\/figcaption><\/figure>\n\n\n\n<p>And the real thing looks &#8230;.quite identical to it.<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><a href=\"http:\/\/nuclearrambo.com\/wordpress\/dra818v-vhf-band-transceiver\/img_20160711_121628\/\" rel=\"attachment wp-att-4424\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"http:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/07\/IMG_20160711_121628-1024x768.jpg\" alt=\"DRA818V pcb\" class=\"wp-image-4424\" srcset=\"https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/07\/IMG_20160711_121628-1024x768.jpg 1024w, https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/07\/IMG_20160711_121628-300x225.jpg 300w, https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/07\/IMG_20160711_121628-768x576.jpg 768w, https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/07\/IMG_20160711_121628-1440x1080.jpg 1440w, https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/07\/IMG_20160711_121628-600x450.jpg 600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">DRA818V PCB Looks identical right?<\/figcaption><\/figure>\n\n\n\n<center><p><script type=\"text\/javascript\">\n\tatOptions = {\n\t\t'key' : 'a488f095e80c8a74746e5fdca977eaea',\n\t\t'format' : 'iframe',\n\t\t'height' : 90,\n\t\t'width' : 728,\n\t\t'params' : {}\n\t};\n\tdocument.write('<scr' + 'ipt type=\"text\/javascript\" src=\"http' + (location.protocol === 'https:' ? 's' : '') + ':\/\/www.profitabledisplaynetwork.com\/a488f095e80c8a74746e5fdca977eaea\/invoke.js\"><\/scr' + 'ipt>');\n<\/script><\/p><\/center>\n\n\n\n<h2 class=\"wp-block-heading\">The first test<\/h2>\n\n\n\n<p>The first task is to establish a UART connection. For this, I used a TI Connected launchpad which I had lying on my table. The launchpad operates at 3.3V as well. You might as well get away with using an Arduino for connecting to the module since, the datasheet says that the UART pins on the DRA818V module are TTL tolerant.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">AT+DMOCONNECT<\/pre>\n\n\n\n<p>&#8230;is used for assuring ourselves that the module is operational and indicates that we can send some more commands to change the behaviour of the module. If it responds back with&#8230;<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">+DMOCONNECT: 0<\/pre>\n\n\n\n<p>&#8230;it means that everything is fine.<\/p>\n\n\n\n<p>Let us do something else&#8230;<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">S+145.0000<\/pre>\n\n\n\n<p>&#8230;internally detects existence of power at 145.0000MHz frequency and responds with the following response&#8230;<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">S=0 OR S=1<\/pre>\n\n\n\n<p>S=0 if it detects presence of 145MHz carrier frequency and S=1 if it does not.<\/p>\n\n\n\n<p>I am still not sure whether I was doing everything right, because no matter what signal I fed, it just kept giving me S=1 which was not correct.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">AT+DMOSETGROUP=0,145.0000,145.000,0000,1,0000<\/pre>\n\n\n\n<p>The DMOSETGROUP command tunes the module to receive and transmit 145.0000MHz frequency. There are several numbers in the command for which you can find the details in the datasheet. For our test, we need the first parameter to be 0 indicating the module to expect FM modulation with 12.5kHz deviation. The second and the third parameter indicate transmit and receive frequency which is at 145.0000MHz.<\/p>\n\n\n\n<p>With the configuration done, I hooked up the RF output of the PCB to the spectrum analyzer which plots frequency vs. power as seen in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><a href=\"http:\/\/nuclearrambo.com\/wordpress\/dra818v-vhf-band-transceiver\/img_20160711_121939\/\" rel=\"attachment wp-att-4425\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"http:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/07\/IMG_20160711_121939-1024x768.jpg\" alt=\"DRA818V output on spectrum analyzer\" class=\"wp-image-4425\" srcset=\"https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/07\/IMG_20160711_121939-1024x768.jpg 1024w, https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/07\/IMG_20160711_121939-300x225.jpg 300w, https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/07\/IMG_20160711_121939-768x576.jpg 768w, https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/07\/IMG_20160711_121939-1440x1080.jpg 1440w, https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/07\/IMG_20160711_121939-600x450.jpg 600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">DRA818V output on spectrum analyzer<\/figcaption><\/figure>\n\n\n\n<p>To check if the receiver also works as expected, I need the LM4871 audio amplifier which I still haven&#8217;t been able to obtain as you can see the PCB image where the solder pads are left open for the same reason.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Nevertheless, the purpose of this test was to gain confidence in the DRA818V module which will be used as a HAM radio receiver, or may be even a transmitter. I have some interesting ideas that I intend to implement. For example, using a cheap microcontroller interfaced with a rotary encoder that will relay corresponding commands for tuning on to frequencies. A nice PTT button which can be used a walkie talkie and to make things even better, a cool enclosure to house it all.<\/p>\n\n\n\n<p>I will be posting the second part of this article series explaining the outputs of the receiver. For example we will dive deeper into the analysis of the entire circuit board and how well it does the job.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Necessity to stay connected with others is growing by the day. In cases when mobile network is out of reach and a message needs to be relayed or received, ham radio can prove to&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":4424,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1212],"tags":[1558,1556,1557,1555],"class_list":["post-4413","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electronics-2","tag-dra818v","tag-ham-radio","tag-transceiver","tag-vhf"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>DRA818V VHF band transceiver - Part 1<\/title>\n<meta name=\"description\" content=\"Home brewing your VHF ham transceiver has become so easy with the DRA818V module that can go all the way from 136MHz to 174MHz powered by RDA1486.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nuclearrambo.com\/wordpress\/dra818v-vhf-band-transceiver\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DRA818V VHF band transceiver - Part 1\" \/>\n<meta property=\"og:description\" content=\"Home brewing your VHF ham transceiver has become so easy with the DRA818V module that can go all the way from 136MHz to 174MHz powered by RDA1486.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/nuclearrambo.com\/wordpress\/dra818v-vhf-band-transceiver\/\" \/>\n<meta property=\"og:site_name\" content=\"Nuclearrambo\" \/>\n<meta property=\"article:published_time\" content=\"2016-07-12T15:21:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-10-04T07:45:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/nuclearrambo.com\/wordpress\/wp-content\/uploads\/2016\/07\/IMG_20160711_121628-1024x768.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"768\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"nuclearrambo\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@darkusul\" \/>\n<meta name=\"twitter:site\" content=\"@darkusul\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"nuclearrambo\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/nuclearrambo.com\/wordpress\/dra818v-vhf-band-transceiver\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/nuclearrambo.com\/wordpress\/dra818v-vhf-band-transceiver\/\"},\"author\":{\"name\":\"nuclearrambo\",\"@id\":\"https:\/\/nuclearrambo.com\/wordpress\/#\/schema\/person\/6093ae9d048d4789bd3d18c136577a0c\"},\"headline\":\"DRA818V VHF band transceiver &#8211; 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