{"id":151,"date":"2014-07-13T13:42:29","date_gmt":"2014-07-13T13:42:29","guid":{"rendered":"http:\/\/www.chatteris.biz\/blog\/?p=151"},"modified":"2025-08-28T08:36:29","modified_gmt":"2025-08-28T07:36:29","slug":"sg-tuner-control-pt1","status":"publish","type":"post","link":"https:\/\/www.chatteris.biz\/blog\/sg-tuner-control-pt1\/","title":{"rendered":"SG-237 Tuner Control pt1"},"content":{"rendered":"\n<p><em>Updated 28 A<\/em>ugust 2025<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"206\" height=\"57\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2022\/03\/sgc.jpg\" alt=\"\" class=\"wp-image-4992\"\/><\/figure>\n<\/div>\n\n\n<p>As I want a relatively discrete antenna arrangement for my radio ham interest, I have opted for a single random length wire with automatic tuning being dealt with by a SG-237 tuner, Part 2 of this blog will go into the fixing details of the antenna and hardware.<\/p>\n\n\n\n<p>I have made a tuner control unit out of a single gang blank faceplate, although this is not required for the basic installation, it will give me some control and confirmation indications at the shack end of power and that the tuner has finished tuning.<\/p>\n\n\n\n<p>The schematic I followed with the exception of the polarity protection diode and Antenna Available ON led, is within the manual available from SG Tuners, I used an small offcut of veroboard to make the unit and this will be inside a backbox, the faceplate displays the lights and access the controls.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_50611.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_50611-300x225.jpg\" alt=\"board v2\" class=\"wp-image-207\" style=\"width:485px;height:363px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_50611-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_50611-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-image size-full is-style-default\"><img loading=\"lazy\" decoding=\"async\" width=\"467\" height=\"673\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/schematic-from-manual1.jpg\" alt=\"\" class=\"wp-image-210\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/schematic-from-manual1.jpg 467w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/schematic-from-manual1-208x300.jpg 208w\" sizes=\"auto, (max-width: 467px) 100vw, 467px\" \/><\/figure>\n\n\n\n<p>The veroboard layout is shown here.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-zoooom\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"730\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2022\/04\/SG-Tuner-BoardV3-1024x730.jpg\" alt=\"\" class=\"wp-image-5168\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2022\/04\/SG-Tuner-BoardV3-1024x730.jpg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2022\/04\/SG-Tuner-BoardV3-300x214.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2022\/04\/SG-Tuner-BoardV3-768x548.jpg 768w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2022\/04\/SG-Tuner-BoardV3-1536x1095.jpg 1536w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2022\/04\/SG-Tuner-BoardV3-2048x1461.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>NOTE: Resistor R4 on the Vero Board is 1k\u03a9 and used as a current limiting resistor for the Green power ON LED.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"871\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2022\/04\/2n2222-1024x871.jpg\" alt=\"\" class=\"wp-image-5157\" style=\"width:355px;height:301px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2022\/04\/2n2222-1024x871.jpg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2022\/04\/2n2222-300x255.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2022\/04\/2n2222-768x653.jpg 768w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2022\/04\/2n2222.jpg 1035w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p>This is the unit fully assembled but not yet labeled, holes were drilled will a hss bit on a slow speed, letting the drillbit do the work with little pressure, I bought off ebay a Dremel copy, and used the grinding bit to gently open the holes to the right size and also to grind down the faceplate support ridges:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5043.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5043-300x225.jpg\" alt=\"Virgin Faceplate\" class=\"wp-image-168\" style=\"width:460px;height:345px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5043-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5043-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5040.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5040-300x225.jpg\" alt=\"SAM_5040\" class=\"wp-image-166\" style=\"width:468px;height:345px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5040-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5040-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Labeled unit ready for installation, the label is made in Word or Visio to the right dimensions, printed to plain paper and cut slightly oversize, the reverse of the paper then has double sided self-adhesive tape applied, the front of the label then has a clear self adhesive covering applied (the sort of clear covering you would use for school books), I used a sharp knife, steel rule and cutting mat to cut just inside of the second outer boarder of the label, I printed a double border in case I made a hash of cutting it the first time, at least I could have another shot.<\/p>\n\n\n\n<p>Once the label was ready, I striped down the faceplate, lined it up and carefully stuck it to the faceplate, to cut the holes, I held the faceplate to the light and used the knife to starburst the holes before going round the edges to clean up.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5059.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5059-300x225.jpg\" alt=\"faceplate v2\" class=\"wp-image-203\" style=\"width:478px;height:355px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5059-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5059-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>I have added an led which will light when the longwire is NOT to ground, the transfer will be done by a mechanical knife switch, the switch is a double pole double throw, one contact pole will switch the antenna wire from the SG-237 to ground, whilst the other pole will switch the Anntena Available led, credit goes to Bill O&#8217;Neil, KW8KW for a simple but effective solution to what could be a costly problem.<\/p>\n\n\n\n<p>INSTALLATION IN SHACK<\/p>\n\n\n\n<p>I opted to fit a double dry lining box and to have once side blanked as a spare for future use, the positioning of the tuner control was important as I did not want the display obscured by the PC monitor.<\/p>\n\n\n\n<p>I started by clearing the area:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5063.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5063-300x225.jpg\" alt=\"Preparing\" class=\"wp-image-215\" style=\"width:500px;height:374px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5063-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5063-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Offered the backbox to the wall and leveled it with the existing antenna faceplate:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5064.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5064-300x225.jpg\" alt=\"Wall Marked\" class=\"wp-image-216\" style=\"width:506px;height:376px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5064-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5064-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Bin bag opened and taped to the dado trunking ready to contain the majority of the mess:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5065.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5065-300x225.jpg\" alt=\"Bag in place\" class=\"wp-image-217\" style=\"width:505px;height:379px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5065-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5065-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Using a sharp utility knife I scored the plaster board along the pencil markings, repeating this a number of times until the blade cuts through (the finishing lining plasterboard is quite thin for my internal walls, so it was quite easy), you can use the alternate method of drilling a hole at each corner and cut the hole with a plasterboard saw or similar.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5066.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5066-300x225.jpg\" alt=\"board knife cut\" class=\"wp-image-218\" style=\"width:501px;height:374px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5066-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5066-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>I knew by tapping on the plasterboard that the fixing adhesive was right in the middle of the hole, to break the cut board out, I split the board worth a chisel and took each piece out, I try not to let the pieces fall into the cavity between the wall and the board, the adhesive was removed using a bolster chisel, notches in the breeze block were needed to allow the fixing wings of the dry lining box to be fully pushed back to clear the plasterboard:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5067.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5067-300x225.jpg\" alt=\"wall exposed\" class=\"wp-image-219\" style=\"width:508px;height:378px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5067-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5067-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>The control cable to the SG-237 tuner was put in place when I was drawing the antenna cables:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5068.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5068-300x225.jpg\" alt=\"cable fished\" class=\"wp-image-220\" style=\"width:483px;height:362px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5068-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5068-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Drylining box in place with cable conductors pin crimped:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5069.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5069-300x225.jpg\" alt=\"box in ends made off\" class=\"wp-image-221\" style=\"width:489px;height:365px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5069-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5069-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Cable connected to veroboard:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5070.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5070-300x225.jpg\" alt=\"connected to veroboard\" class=\"wp-image-222\" style=\"width:477px;height:357px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5070-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5070-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Veroboard sized to fit within rear of backbox:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5071.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5071-300x225.jpg\" alt=\"vero in backbox\" class=\"wp-image-223\" style=\"width:472px;height:353px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5071-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5071-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Faceplates screwed on and area cleaned up:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5072.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5072-300x225.jpg\" alt=\"faceplate on\" class=\"wp-image-224\" style=\"width:462px;height:345px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5072-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5072-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Job done, 12v wall wart PSU plugged in all ready for Part2 hardware and long wire installation.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5073.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"http:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5073-300x225.jpg\" alt=\"back together\" class=\"wp-image-225\" style=\"width:458px;height:343px\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5073-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2014\/07\/SAM_5073-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><a title=\"part2\" href=\"http:\/\/www.chatteris.biz\/blog\/?p=232\">Click for part2<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Updated 28 August 2025 As I want a relatively discrete antenna arrangement for my radio ham interest, I have opted for a single random length wire with automatic tuning being dealt with by a SG-237 tuner, Part 2 of this blog will go into the fixing details of the antenna and hardware. I have made &hellip; <a href=\"https:\/\/www.chatteris.biz\/blog\/sg-tuner-control-pt1\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">SG-237 Tuner Control pt1<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[3],"tags":[219,218],"class_list":["post-151","post","type-post","status-publish","format-standard","hentry","category-radio-ham","tag-auto-tuner","tag-sg237"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SG-237 Tuner Control pt1 - 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\/sg-tuner-control-pt1\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SG-237 Tuner Control pt1 - My Blog\" \/>\n<meta property=\"og:description\" content=\"Updated 28 August 2025 As I want a relatively discrete antenna arrangement for my radio ham interest, I have opted for a single random length wire with automatic tuning being dealt with by a SG-237 tuner, Part 2 of this blog will go into the fixing details of the antenna and hardware. I have made &hellip; Continue reading SG-237 Tuner Control pt1 &rarr;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.chatteris.biz\/blog\/sg-tuner-control-pt1\/\" \/>\n<meta property=\"og:site_name\" content=\"My Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/search\/top\/?q=chatterisweather\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/search\/top\/?q=chatterisweather\" \/>\n<meta property=\"article:published_time\" content=\"2014-07-13T13:42:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-28T07:36:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2022\/03\/sgc.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"206\" \/>\n\t<meta property=\"og:image:height\" content=\"57\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Ian\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@chatterisdotbiz\" \/>\n<meta name=\"twitter:site\" content=\"@chatterisdotbiz\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ian\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated 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:\\\/\\\/www.chatteris.biz\\\/blog\\\/sg-tuner-control-pt1\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/sg-tuner-control-pt1\\\/\"},\"author\":{\"name\":\"Ian\",\"@id\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/#\\\/schema\\\/person\\\/8c24a0b1bf9624c7f930fe2f3a5b5f37\"},\"headline\":\"SG-237 Tuner Control pt1\",\"datePublished\":\"2014-07-13T13:42:29+00:00\",\"dateModified\":\"2025-08-28T07:36:29+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/sg-tuner-control-pt1\\\/\"},\"wordCount\":768,\"publisher\":{\"@id\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/#\\\/schema\\\/person\\\/8c24a0b1bf9624c7f930fe2f3a5b5f37\"},\"image\":{\"@id\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/sg-tuner-control-pt1\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/03\\\/sgc.jpg\",\"keywords\":[\"auto tuner\",\"SG237\"],\"articleSection\":[\"Ham Radio\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/sg-tuner-control-pt1\\\/\",\"url\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/sg-tuner-control-pt1\\\/\",\"name\":\"SG-237 Tuner Control pt1 - 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