http:\/\/www.giangrandi.ch\/electronics\/diode-clipper\/diode-clipper.shtml<\/a>:<\/p>\n“The basic idea of the diode clipper is that for signals with an amplitude within \u00b10.7 Vpeak (less than about +7 dBm over 50 ?) the diodes are just open circuits and do not interfere; for higher amplitudes, the diodes clip the signal to about \u00b10.7 Vpeak limiting the maximum power that reaches the receiver at about +10 dBm over 50 ?, which the vast majority of receiver circuits can easily tolerate. If you wonder why I specified +7 dBm for unclipped signals and +10 dBm for clipped ones of the same peak to peak amplitude, it’s because unclipped signals are supposed to have a nice sinusoidal shape; once clipped, they become more square and their RMS voltage is higher, explaining the 3 dB difference.”<\/p><\/blockquote>\n
Thanks for sharing this, Mehdi! I’m happy to see that the PL-680 has some built-in ESD protection.<\/p>\n","protected":false},"excerpt":{"rendered":"
Many thanks to SWLing Post contributor, Mehdi, who writes: Once you told me to be careful when attaching an external antenna to my portable radio. Today I opened it to see whether it has some sort of protection on its external antenna path. As you can see in the picture below, there are two diodes […]<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3,3196,26,43],"tags":[4371,3457,479,3456,4494],"class_list":["post-15933","post","type-post","status-publish","format-standard","hentry","category-news","category-portable-radio","category-radios","category-shortwave-radio","tag-mehdi","tag-pl-680","tag-tecsun","tag-tecsun-pl-680","tag-tecsun-pl-680-esd"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-48Z","jetpack-related-posts":[{"id":48163,"url":"https:\/\/swling.com\/blog\/2021\/03\/shortwave-portables-external-antennas-overloading-and-electrostatic-discharge\/","url_meta":{"origin":15933,"position":0},"title":"Shortwave portables, external antennas, overloading, and electrostatic discharge","author":"Thomas","date":"March 12, 2021","format":false,"excerpt":"Many thanks to SWLing Post contributor, Jack Dully, who writes: I am just wondering what portable receivers are more susceptible to overloading with long dipoles, say 60-70 ft. I regularly use such and I have never noticed anything unusual happening with a Sony ICF-7600GR, Grundig G3, or PL-880 to name\u2026","rel":"","context":"In "Antennas"","block_context":{"text":"Antennas","link":"https:\/\/swling.com\/blog\/category\/antennas\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/08\/Sony-ICF-SW7600GR-RA-CO.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/08\/Sony-ICF-SW7600GR-RA-CO.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/08\/Sony-ICF-SW7600GR-RA-CO.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":29028,"url":"https:\/\/swling.com\/blog\/2017\/11\/rolfs-pl-680-modification-allows-external-antenna-on-lw-and-mw\/","url_meta":{"origin":15933,"position":1},"title":"Rolf’s PL-680 modification allows external antenna on LW and MW","author":"Thomas","date":"November 5, 2017","format":false,"excerpt":"Many thanks to\u00a0SWLing Post\u00a0contributor,\u00a0Rolf Snijder, who writes: I did a modification today on the Tecsun PL-680 [which allows for an] external antenna on LW and MW. The internal ferriet is also working, but on my active loop, MW and LW is now working ! So far away stations I can\u2026","rel":"","context":"In "How To"","block_context":{"text":"How To","link":"https:\/\/swling.com\/blog\/category\/how-to\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/12\/Tecsun_PL-680.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/12\/Tecsun_PL-680.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/12\/Tecsun_PL-680.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/12\/Tecsun_PL-680.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":22753,"url":"https:\/\/swling.com\/blog\/2016\/12\/tecsun-pl-680-just-how-sensitive-is-this-radio\/","url_meta":{"origin":15933,"position":2},"title":"Tecsun PL-680: Just How Sensitive is This Radio?","author":"Rob Wagner","date":"December 8, 2016","format":false,"excerpt":"More than\u00a0two months ago, in the Mount Evelyn DX Report I\u00a0posted a review of the Tecsun PL-680 portable receiver, entitled Tecsun PL-680 Beats Expectations. In that article, I pointed out many of the positives and a few of the flaws surrounding the unit. At the end of the review, I\u2026","rel":"","context":"In "Portable Radio"","block_context":{"text":"Portable Radio","link":"https:\/\/swling.com\/blog\/category\/portable-radio\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/12\/Fig-7-Tecsun-PL-680-1024x745.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/12\/Fig-7-Tecsun-PL-680-1024x745.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/12\/Fig-7-Tecsun-PL-680-1024x745.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":12258,"url":"https:\/\/swling.com\/blog\/2015\/02\/unboxing-the-tecsun-pl-680\/","url_meta":{"origin":15933,"position":3},"title":"Unboxing the Tecsun PL-680","author":"Thomas","date":"February 11, 2015","format":false,"excerpt":"When I got home, after a very long day, I found that FedEx delivered the Tecsun PL-680 I ordered from Anon-Co. \u00a0I haven't even had a moment\u00a0to listen to the PL-680 yet, but I hope to make time tomorrow. I'm happy to see that the PL-680 has hassle-free, well-designed packaging:\u2026","rel":"","context":"In "New Products"","block_context":{"text":"New Products","link":"https:\/\/swling.com\/blog\/category\/new-products\/"},"img":{"alt_text":"Tecsun-PL-680-6","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/02\/Tecsun-PL-680-6.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/02\/Tecsun-PL-680-6.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/02\/Tecsun-PL-680-6.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/02\/Tecsun-PL-680-6.jpg?resize=700%2C400 2x"},"classes":[]},{"id":11674,"url":"https:\/\/swling.com\/blog\/2014\/12\/a-new-portable-the-tecsun-pl-680\/","url_meta":{"origin":15933,"position":4},"title":"The Tecsun PL-680: A new portable in the works?","author":"Thomas","date":"December 12, 2014","format":false,"excerpt":"SWLing Post reader, Antonio, writes: \"It seems that a new radio is on the horizon. Nevada Radio, in the U.K., has announced the new Tecsun PL-680.\" Thanks, Antonio--admittedly, I was completely unaware of this upcoming model. Based on the photo (above) via\u00a0Nevada Radio, the PL-680 looks very much like the\u2026","rel":"","context":"In "New Products"","block_context":{"text":"New Products","link":"https:\/\/swling.com\/blog\/category\/new-products\/"},"img":{"alt_text":"PL-680-Nevada","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/12\/PL-680-Nevada.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/12\/PL-680-Nevada.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/12\/PL-680-Nevada.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":14504,"url":"https:\/\/swling.com\/blog\/2015\/08\/universal-radio-used-tecsun-pl-680-for-69-95\/","url_meta":{"origin":15933,"position":5},"title":"Universal Radio: Used Tecsun PL-680 for $69.95","author":"Thomas","date":"August 26, 2015","format":false,"excerpt":"I just noticed that Universal Radio is featuring the following used Tecsun PL-680 in their used receiver collection. Here's the description: The Tecsun PL-680 receives longwave, AM, FM and SW bands plus VHF Airband. It features a backlit digital display, stereo FM (to ear jack), SSB, clock timer, 2000 Memories,\u2026","rel":"","context":"In "Deals"","block_context":{"text":"Deals","link":"https:\/\/swling.com\/blog\/category\/deals\/"},"img":{"alt_text":"Universal-Radio-Used-Tecsun-PL-680","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/08\/Universal-Radio-Used-Tecsun-PL-680.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/08\/Universal-Radio-Used-Tecsun-PL-680.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/08\/Universal-Radio-Used-Tecsun-PL-680.jpg?resize=525%2C300 1.5x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/15933","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/comments?post=15933"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/15933\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=15933"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=15933"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=15933"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"The](\"http:\/\/swling.com\/blog\/wp-content\/uploads\/2015\/12\/Tecsun_PL-680.jpg\")
<\/p>\n![\"Tecsun-PL-680-Diodes\"](\"http:\/\/swling.com\/blog\/wp-content\/uploads\/2015\/11\/Tecsun-PL-680-Diodes.jpg\")
<\/a><\/p>\n