{"id":1471,"date":"2018-03-30T23:43:53","date_gmt":"2018-03-31T06:43:53","guid":{"rendered":"http:\/\/k6hr.com\/?p=1471"},"modified":"2023-01-22T17:42:01","modified_gmt":"2023-01-23T01:42:01","slug":"mfj-1708-automatic-antenna-switch","status":"publish","type":"post","link":"http:\/\/k6hr.com\/index.php\/2018\/03\/30\/mfj-1708-automatic-antenna-switch\/","title":{"rendered":"MFJ-1708 Automatic Antenna Switch"},"content":{"rendered":"

Today I checked out the new MFJ-1708 RF Sense Transmit\/Receive Switch<\/a><\/p>\n

\"MFJ-1708
MFJ-1708 RF Sensing T\/R Switch<\/figcaption><\/figure>\n

This neat little MFJ automatic T\/R switch senses transmitted RF and switches your antenna from receive to transmit using a relay. It shorts your receiver antenna input to ground to protect your receiver. It also provides an auxiliary contact closure to ground during receive (opened in transmit) for an “On-the-Air” sign or other use, perhaps even a TX Interlock line. The adjustable delay means I can fine tune it for perfect open\/close.<\/p>\n

Instead of using RF sense to switch the antenna, a control line input lets your key\/keyer or PTT line switch the antenna. An adjustable time delay circuit gives you delayed switching. This prevents your antenna from switching between dots and dashes or between syllable and words.<\/p>\n

Works on all modes — CW, AM, SSB, FM, and digital modes. It handles 200W SSB PEP. Compact 4 W x 2 5\/8 H x 1 1\/2 D inches.<\/p>\n

It has SO-239 coax connectors for antenna, transmitter, and receiver. It has control input, auxiliary contact closure to ground, time delay screwdriver adjustment, power jack. Requires 12 VDC or 110 VAC with MFJ-1312D<\/p>\n

I plan to use this switch so I can listen on my IC-765, but transmit from my Flex 5000 HF port. The MFJ-1708<\/a> is rated for 200 watts<\/p>\n","protected":false},"excerpt":{"rendered":"

Today I checked out the new MFJ-1708 RF Sense Transmit\/Receive Switch This neat little MFJ automatic T\/R switch senses transmitted RF and switches your antenna from receive to transmit using a relay. It shorts your receiver antenna input to ground to protect your receiver. It also provides an auxiliary contact closure to ground during receive … Continue reading “MFJ-1708 Automatic Antenna Switch”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"categories":[12],"tags":[97,94],"class_list":["post-1471","post","type-post","status-publish","format-standard","hentry","category-whats-new","tag-automatic-antenna-switch","tag-mfj-1708"],"yoast_head":"\nMFJ-1708 Automatic Antenna Switch - K6HR SDR Server 2026<\/title>\n<meta name=\"description\" content=\"K6HR SDR Server 2023 - MFJ-1708 Automatic Antenna Switch\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/k6hr.com\/index.php\/2018\/03\/30\/mfj-1708-automatic-antenna-switch\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MFJ-1708 Automatic Antenna Switch - 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