{"id":20,"date":"2014-04-27T15:48:23","date_gmt":"2014-04-27T15:48:23","guid":{"rendered":"http:\/\/www.chatteris.biz\/blog\/?page_id=20"},"modified":"2022-03-06T18:34:20","modified_gmt":"2022-03-06T18:34:20","slug":"vfo-intermediate-kit-project","status":"publish","type":"page","link":"https:\/\/www.chatteris.biz\/blog\/vfo-intermediate-kit-project\/","title":{"rendered":"VFO Intermediate Kit Project"},"content":{"rendered":"\n<p>After completing and passing the radio amateur foundation licence test, I have decided to undertake the Intermediate licence training with the hope of gaining this Licence, as part of the syllabus the construction of a project is required, the project used within the &#8216;Intermediate Licence &#8211; Building on the Foundation&#8217; book (\u00a38.94 inc postage from www.rsgb.org) shows a Variable Frequency Oscillator (VFO).<\/p>\n\n\n\n<p>I sourced the kit through JAB Electronic Components (<a title=\"jabdog\" href=\"http:\/\/www.jabdog.com\" target=\"_blank\" rel=\"noopener\">www.jabdog.com<\/a>), the kit cost \u00a312.95 inc postage and I must say the level of customer service was exceptional, I can highly recommend this vendor.<\/p>\n\n\n\n<p>The kit contains all the parts to construct the VFO, a parts list comes with the kit, but the wiring schematic is in the Foundation book and was therefore not included in the kit, also you will need a 9v pp3 battery (or equivalent) and assembly tools.<\/p>\n\n\n\n<p>The kits form part of the structured learning at radio clubs for those undertaking the foundation course, as I have experience of electronic construction, I made and tested the unit at home, but will use the kit as evidence in meeting the syllabus requirements.<\/p>\n\n\n\n<p>The Parts came the next day, with the fist task of checking-off the components and sorting them into the partitioned bit box:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"\/\/www.chatteris.biz\/VFO\/1.JPG\"><img decoding=\"async\" src=\"\/\/www.chatteris.biz\/VFO\/1.JPG\" alt=\"Delivery\"\/><\/a><\/figure>\n\n\n\n<p>Once all was in order the dimensions for the board was 60cm x 90cm, I did have a 12v powered table saw for cutting of printed circuit boards, it did manage to cut this board but it was a struggle, a hacksaw would have been quicker:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"\/\/www.chatteris.biz\/VFO\/2.JPG\"><img decoding=\"async\" src=\"\/\/www.chatteris.biz\/VFO\/2.JPG\" alt=\"Cut\"\/><\/a><\/figure>\n\n\n\n<p>Once the base was cut, the front panel for the variable capacitor needed to be cut, the top of the front panel has the edges cut off at 45 degrees, this cut material is not wasted, it is used to give the front panel mechanical support, prior to soldering, I used blue tack to hold the front panel in place, to ensure a good soldered joint, I use a pencil eraser to clean the copper board of oxide before applying heat.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"\/\/www.chatteris.biz\/VFO\/3.JPG\"><img decoding=\"async\" src=\"\/\/www.chatteris.biz\/VFO\/3.JPG\" alt=\"Front\"\/><\/a><\/figure>\n\n\n\n<p>The front panel is now mechanically secure and so I could mount and solder in the variable capacitor, the kit does not include fixing machine screws, I found some screws taken from a laptop when it was being disassembled which were the correct fit which was lucky as the screws are tiny:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"\/\/www.chatteris.biz\/VFO\/4.JPG\"><img decoding=\"async\" src=\"\/\/www.chatteris.biz\/VFO\/4.JPG\" alt=\"soldered front\"\/><\/a><\/figure>\n\n\n\n<p>The trimmer and capacitor were next soldered in, to the left of the picture is the KANK variable inductor which was the next component to get soldered in, the positioning of this was dependant on the length of the capacitors lead, I wanted to minimise any additional wiring, so where possible I used the component leads and jointed other components from these:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"\/\/www.chatteris.biz\/VFO\/5.JPG\"><img decoding=\"async\" src=\"\/\/www.chatteris.biz\/VFO\/5.JPG\" alt=\"trimmer\"\/><\/a><\/figure>\n\n\n\n<p>Once the inductor was in place, this gave the run for the other components, I did not follow the layout diagram (fig 43: VFO Layout) in the foundation book as I found it easier to use circuit diagram, which I found on the internet from <a href=\"\/\/docs.google.com\/document\/d\/13CWew5TOlQObvTURvuk2pmlIksUwBRM1D3eVSKFqrgg\/edit\">South Bristol Amateur Radio Club,<\/a>&nbsp;this&nbsp;will assist any fault finding at a later stage should it be needed.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><a href=\"\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/vfodiagram.jpg\" rel=\"attachment wp-att-1086\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"152\" src=\"\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/vfodiagram-300x152.jpg\" alt=\"vfodiagram\" class=\"wp-image-1086\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/vfodiagram-300x152.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/vfodiagram.jpg 667w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure><\/div>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"\/\/www.chatteris.biz\/VFO\/6.JPG\"><img decoding=\"async\" src=\"\/\/www.chatteris.biz\/VFO\/6.JPG\" alt=\"layed out\"\/><\/a><\/figure>\n\n\n\n<p>With all parts soldered in place I used Velcro to hold the battery in place, as this was a test piece I did not incorporate an on\/off switch. Prior to powering up I checked all the connections were sound and that components were correctly fitted, using a Digital Volt Meter set on the mA range in series with the circuit, I applied the battery terminal and checked the load, 8mA was being drawn, so all was well.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"\/\/www.chatteris.biz\/VFO\/8.JPG\"><img decoding=\"async\" src=\"\/\/www.chatteris.biz\/VFO\/8.JPG\" alt=\"testing\"\/><\/a><\/figure>\n\n\n\n<p>Final stage was to secure the battery leads to the board by passing a cable tie through drilled holes, the RF out connection needed some support as test leads would be clipped to this, I used an off-cut and soldered it to the baseboard and then to the output wire ensuring that I had broken the copper etch using a hacksaw. I linked the VFO to my scope to <em><strong><a href=\"\/\/docs.google.com\/document\/d\/13CWew5TOlQObvTURvuk2pmlIksUwBRM1D3eVSKFqrgg\/edit\">calibrate<\/a><\/strong><\/em> for operation and once proved working, roughly calibrated the front scale.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"\/\/www.chatteris.biz\/VFO\/9.JPG\"><img decoding=\"async\" src=\"\/\/www.chatteris.biz\/VFO\/9.JPG\" alt=\"working\"\/><\/a><\/figure>\n\n\n\n<p>All that was left was to put the &#8216;sticky feet&#8217; on the base and that was it!<\/p>\n\n\n\n<p>(Big thank you to Andy (G6OHM) for offering to vouch that this was all made by my own fair hands :-))<\/p>\n\n\n\n<p><strong>Updated 3 April 16<\/strong><\/p>\n\n\n\n<p>I have added a number of images which offer better clarity of how things are soldered together, certain images above now have a hover over zoom enabled as well.<\/p>\n\n\n\n<div class=\"wp-block-image is-style-zoooom\"><figure class=\"aligncenter is-resized\"><a href=\"\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-08.02.04.jpg\" rel=\"attachment wp-att-1081\"><img loading=\"lazy\" decoding=\"async\" src=\"\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-08.02.04-225x300.jpg\" alt=\"2016-04-03 08.02.04\" class=\"wp-image-1081\" width=\"384\" height=\"512\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-08.02.04-225x300.jpg 225w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-08.02.04-768x1024.jpg 768w\" sizes=\"auto, (max-width: 384px) 100vw, 384px\" \/><\/a><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image is-style-zoooom\"><figure class=\"aligncenter is-resized\"><a href=\"\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-08.01.19.jpg\" rel=\"attachment wp-att-1080\"><img loading=\"lazy\" decoding=\"async\" src=\"\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-08.01.19-225x300.jpg\" alt=\"2016-04-03 08.01.19\" class=\"wp-image-1080\" width=\"386\" height=\"515\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-08.01.19-225x300.jpg 225w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-08.01.19-768x1024.jpg 768w\" sizes=\"auto, (max-width: 386px) 100vw, 386px\" \/><\/a><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image is-style-zoooom\"><figure class=\"aligncenter is-resized\"><a href=\"\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-08.00.37.jpg\" rel=\"attachment wp-att-1079\"><img loading=\"lazy\" decoding=\"async\" src=\"\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-08.00.37-225x300.jpg\" alt=\"2016-04-03 08.00.37\" class=\"wp-image-1079\" width=\"377\" height=\"503\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-08.00.37-225x300.jpg 225w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-08.00.37-768x1024.jpg 768w\" sizes=\"auto, (max-width: 377px) 100vw, 377px\" \/><\/a><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image is-style-zoooom\"><figure class=\"aligncenter is-resized\"><a href=\"\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-07.59.30.jpg\" rel=\"attachment wp-att-1078\"><img loading=\"lazy\" decoding=\"async\" src=\"\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-07.59.30-225x300.jpg\" alt=\"2016-04-03 07.59.30\" class=\"wp-image-1078\" width=\"373\" height=\"497\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-07.59.30-225x300.jpg 225w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2016\/04\/2016-04-03-07.59.30-768x1024.jpg 768w\" sizes=\"auto, (max-width: 373px) 100vw, 373px\" \/><\/a><\/figure><\/div>\n","protected":false},"excerpt":{"rendered":"<p>After completing and passing the radio amateur foundation licence test, I have decided to undertake the Intermediate licence training with the hope of gaining this Licence, as part of the syllabus the construction of a project is required, the project used within the &#8216;Intermediate Licence &#8211; Building on the Foundation&#8217; book (\u00a38.94 inc postage from &hellip; <a href=\"https:\/\/www.chatteris.biz\/blog\/vfo-intermediate-kit-project\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">VFO Intermediate Kit Project<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-20","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>VFO Intermediate Kit Project - My Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.chatteris.biz\/blog\/vfo-intermediate-kit-project\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"VFO Intermediate Kit Project - My Blog\" \/>\n<meta property=\"og:description\" content=\"After completing and passing the radio amateur foundation licence test, I have decided to undertake the Intermediate licence training with the hope of gaining this Licence, as part of the syllabus the construction of a project is required, the project used within the &#8216;Intermediate Licence &#8211; 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