{"id":17502,"date":"2016-02-27T08:56:38","date_gmt":"2016-02-27T12:56:38","guid":{"rendered":"http:\/\/swling.com\/blog\/?p=17502"},"modified":"2016-02-27T08:56:38","modified_gmt":"2016-02-27T12:56:38","slug":"mikes-low-and-high-pass-filter-deals","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2016\/02\/mikes-low-and-high-pass-filter-deals\/","title":{"rendered":"Mike’s low and high pass filter deals"},"content":{"rendered":"

\"HDSDR-SDRPlay-RSP-PARI\"<\/a>SWLing Post<\/em> contributor, Mike Ladd, is an avid SDR enthusiast and an\u00a0administrator of the SDRplay Facebook group<\/a>.\u00a0Mike\u00a0contacted me about special pricing he has arranged for low and high pass filters through Rescue Electronics<\/a>. Mike explains:<\/p>\n

These filters retail for $70.00 each. I spoke to the builder. I told him who I was and what I do and got him to make a deal for anyone in the United States with these filters and a direct link to his site. I make zero dollars on this. I always try to give back to the hobby and the community any way possible.<\/em><\/p>\n

You have 3 choices: a high pass filter, a low pass filter, or a combo package.<\/em><\/p>\n

These are hand built one at a time by Paul W1VLF with your choice of SO-239 or BNC connections. Full details are below:<\/em><\/p>\n

\n

\n

High pass filter $55 shipped anywhere in the USA<\/strong><\/p>\n

\"AM-HP_Filter-600x372\"<\/a><\/p>\n

This filter will begin attacking the AM band at 1770 Khz and increase attenuation as frequency decreases.<\/p>\n

You can see this in the screen capture of the swept filter below.\"AM-HP_Filter_Plot2-600x513\"<\/a><\/p>\n

160 Meters and above is virtually left untouched, but below that is where the attenuation takes place.<\/p>\n

The filter has attenuated 60 db by 960 KHz.<\/p>\n

The AM band has some very large signals that can mix in the front end of your. A lot of these spurious frequencies can land in 160 meter band or above.<\/p>\n

For instance, I have a big signal at 1080 Khz and another at 770 Khz, add these 2 together and you get a spur that falls at 1850 Khz<\/p>\n

Picture this happening at multiple frequencies with multiple mixes and you have a raised noise floor in the 160 Meter band.<\/p>\n

The filter is built into a 2″ x 4″ 1.25″ 1\/8″ wall aluminum enclosure for excellent RF shielding<\/p>\n

Low pass filter $55 shipped anywhere in the USA<\/strong><\/p>\n

\"AM-2_Filter-600x343\"<\/a><\/p>\n

The AM-2 filter has a cutoff at 520 KHz.<\/p>\n

\"AM-2_Filter_Plot2-600x543\"<\/a>Then, and without a lot of fanfare it begins the attack on the MW band.<\/p>\n

Purchase this filter if you are into NDB,\u00a0DX’ing, Maritime Mobile, Navetex, FCC Part 5 600 Meter band.<\/p>\n

Each filter is handmade and swept in my lab.<\/p>\n

The AM -2 Low pass is equipped with BNC connectors.<\/p>\n

The filter begins to roll off at 520 Khz and gives an ultimate rejection of around 80 Db.<\/p>\n

The filter is built into a 2″ x 4″ 1.25″ 1\/8″ wall aluminum enclosure for excellent RF shielding<\/p>\n

Combo deal for both $100 shipped anywhere in the USA<\/strong><\/p>\n

\"AM-2_Filter-600x343\"<\/a> \"AM-HP_Filter-600x372\"<\/a><\/p>\n

Click here to view\/purchase via Mike Ladd’s promotional page at Rescue Electronics.\u00a0<\/a><\/strong><\/p>\n

Many thanks for sharing this Mike! During my presentation at the Winter SWL Fest last week, I spoke about the need for high\/low pass filters for listeners who live in the presence of strong broadcasters and interference. Many of the inexpensive SDRs on the market do not have built-in filters and preselectors thus can overload under these conditions.<\/p>\n

While filters can be homebrewed<\/a> or built from kits<\/a>, these filters seem to be a good deal for a quality shielded and tested product. Thanks for arranging this, Mike!<\/p>\n","protected":false},"excerpt":{"rendered":"

SWLing Post contributor, Mike Ladd, is an avid SDR enthusiast and an\u00a0administrator of the SDRplay Facebook group.\u00a0Mike\u00a0contacted me about special pricing he has arranged for low and high pass filters through Rescue Electronics. Mike explains: These filters retail for $70.00 each. I spoke to the builder. I told him who I was and what I […]<\/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":[4199,373,4138,545,433,836,3,43],"tags":[4752,4751,4790,4713,4791,157,4087],"class_list":["post-17502","post","type-post","status-publish","format-standard","hentry","category-accessories","category-am","category-deals","category-ham-radio","category-mediumwave","category-new-products","category-news","category-shortwave-radio","tag-filters","tag-high-pass-filter","tag-low-pass-filter","tag-mike-ladd","tag-rescue-electronics","tag-sdr","tag-software-defined-radio"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-4yi","jetpack-related-posts":[{"id":17623,"url":"https:\/\/swling.com\/blog\/2016\/03\/mikes-virtual-audio-cable-vac-promotion\/","url_meta":{"origin":17502,"position":0},"title":"Mike’s Virtual Audio Cable (VAC) promotion","author":"Thomas","date":"March 5, 2016","format":false,"excerpt":"SWLing Post contributor, Mike Ladd, has been working with vendors to lock in promotional pricing on products and accessories commonly used by SDR enthusiasts. Last week, for example, he shared an excellent promotion for high\/low pass filters. This time, Mike has reached out to the author of Virtual Audio Cable\u2026","rel":"","context":"In "Accessories"","block_context":{"text":"Accessories","link":"https:\/\/swling.com\/blog\/category\/accessories\/"},"img":{"alt_text":"vac_controlpanel","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/03\/vac_controlpanel.gif?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/03\/vac_controlpanel.gif?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/03\/vac_controlpanel.gif?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/03\/vac_controlpanel.gif?resize=700%2C400 2x"},"classes":[]},{"id":18158,"url":"https:\/\/swling.com\/blog\/2016\/04\/mikes-overview-and-review-of-the-40-soft66rtl3-sdr-by-kazunori-miura-ja7tdo\/","url_meta":{"origin":17502,"position":1},"title":"Mike’s overview and review of the $40 Soft66RTL3 SDR by Kazunori Miura (JA7TDO)","author":"Thomas","date":"April 8, 2016","format":false,"excerpt":"Many thanks to SWLing Post contributor, Mike Ladd, for the following guest post and overview of setting up and using the\u00a0Soft66RTL3 SDR: Soft66RTL3 SDR:\u00a0A low cost\u2026Good performer direct from Japan by Mike Ladd Much has changed in the last 8 years in the world of SDR radios. Fast forward to\u2026","rel":"","context":"In "Deals"","block_context":{"text":"Deals","link":"https:\/\/swling.com\/blog\/category\/deals\/"},"img":{"alt_text":"RTL3","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/04\/RTL3-e1460120227144.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/04\/RTL3-e1460120227144.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/04\/RTL3-e1460120227144.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":13506,"url":"https:\/\/swling.com\/blog\/2015\/06\/bonitos-new-high-and-low-pass-filters\/","url_meta":{"origin":17502,"position":2},"title":"Bonito’s new high and low pass filters","author":"Thomas","date":"June 10, 2015","format":false,"excerpt":"Dennis Walter at Bonito has just informed me about two new product's they're offering: high and low pass filters. From the Bonito blog: LP060\u00a0Low Pass Filter The elliptically-formed low pass filter LP060 from NTi suppresses all frequencies above 60 MHz. Highly effective antennas combined with near-by strong FM stations often\u2026","rel":"","context":"In "New Products"","block_context":{"text":"New Products","link":"https:\/\/swling.com\/blog\/category\/new-products\/"},"img":{"alt_text":"high-pass","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/06\/high-pass.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/06\/high-pass.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/06\/high-pass.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":24218,"url":"https:\/\/swling.com\/blog\/2017\/02\/fm-notch-filter-for-sdrplay-rsp1\/","url_meta":{"origin":17502,"position":3},"title":"FM Notch Filter for SDRPlay RSP1","author":"Mehdi Asgari","date":"February 16, 2017","format":false,"excerpt":"RF filters are used (as the name implies) to filter\/remove the frequencies you are not interested in and\/or let frequencies you want pass . They come in lots of types. For example a band-pass filter lets the signals in a frequency range to pass through it and rejects\/attenuates other frequencies.\u2026","rel":"","context":"In "Accessories"","block_context":{"text":"Accessories","link":"https:\/\/swling.com\/blog\/category\/accessories\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/07\/SDPlay-RSP.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/07\/SDPlay-RSP.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/07\/SDPlay-RSP.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":17368,"url":"https:\/\/swling.com\/blog\/2016\/02\/a-simple-homebrew-high-pass-filter\/","url_meta":{"origin":17502,"position":4},"title":"A simple homebrew high pass filter","author":"Thomas","date":"February 17, 2016","format":false,"excerpt":"Many thanks to Jon Hudson, of SDRplay, who posted the image above along with the following note on Facebook: David, WA7JHZ has designed and assembled this neat 2.6 MHz high-pass filter (HPF) for use with SDRs. He says that this simple input band-pass filter (BPF) might be of interest to\u2026","rel":"","context":"In "Accessories"","block_context":{"text":"Accessories","link":"https:\/\/swling.com\/blog\/category\/accessories\/"},"img":{"alt_text":"12744054_901043640014242_2651293633303686752_n","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/02\/12744054_901043640014242_2651293633303686752_n.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/02\/12744054_901043640014242_2651293633303686752_n.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/02\/12744054_901043640014242_2651293633303686752_n.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":56297,"url":"https:\/\/swling.com\/blog\/2023\/04\/psa-your-new-radios-filters-may-be-wider-than-you-think\/","url_meta":{"origin":17502,"position":5},"title":"PSA: Your (new) radio’s filters may be wider than you think","author":"13dka","date":"April 15, 2023","format":false,"excerpt":"AM bandwidth confusion: IF Filters today vs. yesterday by 13dka Whether or not a radio is a joy to listen to, or apt for difficult DX is decided to a large part by the last IF filter stage. 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