{"id":9179,"date":"2013-01-29T11:03:00","date_gmt":"2013-01-29T00:03:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2013\/01\/29\/filter-pinout-p-e-b-g-explained\/"},"modified":"2025-07-22T02:04:34","modified_gmt":"2025-07-21T16:04:34","slug":"filter-pinout-p-e-b-g-explained","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2013\/01\/29\/filter-pinout-p-e-b-g-explained\/","title":{"rendered":"Filter Pinout: P, E, B, G Explained"},"content":{"rendered":"
<\/a><\/div>\n

I few days ago I asked about the significance of the P, E, B, and G markings on my junkbox Toyo CM 455 kc filter (1969 vintage). PA3BCB — in yet another example of the power of the International Brotherhood of Electronic Wizards — was the first to provide the needed info. And in another example of IBEW awesomeness, KA0LDB noted that the markings are explained in the 1971 RSGB Handbook. <\/b>

<\/b> P = Plate = filter input
B = B+ = mixer B+ plus if needed or input ground
G = Grid = filter output
E = Earth = Ground<\/b><\/p>\n

I like the switched filter arrangement presented above (from the RSGB Handbook); the 2.4 kc bandwidth is great for SSB, but a little tight for AM. I might put in a DPDT switch in the circuit so as to be able to go back to the “broad as a barn door” selectivity provided by just the 455 kc IF cans. <\/b><\/p>\n

<\/b> <\/p>\n

Our book: “SolderSmoke — Global Adventures in Wireless Electronics” http:\/\/soldersmoke.com\/book.htm<\/a> Our coffee mugs, T-Shirts, bumper stickers: http:\/\/www.cafepress.com\/SolderSmoke<\/a> Our Book Store: http:\/\/astore.amazon.com\/contracross-20<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

I few days ago I asked about the significance of the P, E, B, and G markings on my junkbox Toyo CM 455 kc filter (1969 vintage). PA3BCB — in yet another example of the power of the International Brotherhood of Electronic Wizards — was the first to provide the needed info. And in another … Continue reading “Filter Pinout: P, E, B, G Explained”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":9180,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,166,100,119],"tags":[],"class_list":["post-9179","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-filters","category-netherlands","category-old-radio","category-uk"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/9179","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=9179"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/9179\/revisions"}],"predecessor-version":[{"id":9181,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/9179\/revisions\/9181"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/9180"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=9179"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=9179"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=9179"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}