{"id":251,"date":"2017-11-23T13:25:20","date_gmt":"2017-11-23T21:25:20","guid":{"rendered":"https:\/\/ad6dm.net\/log\/?p=251"},"modified":"2017-12-10T11:05:12","modified_gmt":"2017-12-10T19:05:12","slug":"aprs-igate","status":"publish","type":"post","link":"https:\/\/ad6dm.net\/log\/2017\/11\/aprs-igate\/","title":{"rendered":"APRS iGate"},"content":{"rendered":"

Last night I set up an Automatic Packet Reporting System (APRS)<\/a> iGate<\/a> to listen on 144.390 MHz for packets and report them to APRS Internet Service (APRS-IS). This is like a listening station that will improve my area APRS coverage.<\/p>\n

\"\"<\/a>
My receive-only APRS station on https:\/\/aprs.fi<\/figcaption><\/figure>\n

This can be done relatively inexpensively with a Raspberry Pi<\/a>\u00a0(~$35), a RTL-SDR receiver<\/a>\u00a0(~$26), and some opensource linux software available online<\/a>.<\/p>\n

The latest RTL-SDR v3<\/a> is a capable little Software Defined Radio (SDR) receiver that can even receive to HF frequencies. For much cheaper than a standalone HF receiver, you can get the kit that includes a whip dipole<\/a>, extension SMA cables, and mounting hardware. I lengthened the whips to 2m resonance (~19 inches each side).<\/p>\n

Using software in linux: rtl_fm<\/a> and direwolf<\/a>, one is able to listen for APRS traffic on 144.390 MHz<\/a>, decode it, and with the Raspberry Pi\u00a0 connected to the Internet, can send what it hears to the main APRS servers for visibility on aprs.fi<\/a>.<\/p>\n

\"\"<\/a>
Note one guy here sharing his heart rate and blood oxygen levels while on the road.<\/figcaption><\/figure>\n

Now that this is up, I can monitor the firehose of digital packet information that is constantly on the frequency, and relay some close-by transmissions to the rest of the world.<\/p>\n

Special thanks goes to my friend briandef<\/em> (who is studying and may soon become a ham) for his insight and pre-struggle with SDR opensource software to help me debug out how to cleanly set up the RTL-SDR dongle.<\/p>\n","protected":false},"excerpt":{"rendered":"

Last night I set up an Automatic Packet Reporting System (APRS) iGate to listen on 144.390 MHz for packets and report them to APRS Internet Service (APRS-IS). This is like a listening station that will improve my area APRS coverage. This can be done relatively inexpensively with a Raspberry Pi\u00a0(~$35), a RTL-SDR receiver\u00a0(~$26), and some opensource linux software available online. The latest RTL-SDR v3 is a capable little Software Defined Radio (SDR) receiver that can even receive to HF frequencies. For much cheaper than a standalone HF receiver, you can get the kit that includes a whip dipole, extension SMA cables, and mounting hardware. I lengthened the whips to 2m… Read More<\/a><\/p>\n","protected":false},"author":1,"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":[5],"tags":[14,16,15],"class_list":["post-251","post","type-post","status-publish","format-standard","hentry","category-digital","tag-aprs","tag-computer","tag-digital"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p9naFX-43","jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":1187,"url":"https:\/\/ad6dm.net\/log\/2021\/09\/amateur-radio-texting-using-aprs\/","url_meta":{"origin":251,"position":0},"title":"Amateur Radio Texting Using APRS","author":"AD6DM","date":"September 19, 2021","format":false,"excerpt":"Experienced hams have been talking about using APRS messages for SMS texting to friends and family for a few years now. I was mildly interested but found messaging tedious on a handheld transceiver, as well as the brief privacy implications of APRS SMS registration a barrier to entry. However, when\u2026","rel":"","context":"In "Digital"","block_context":{"text":"Digital","link":"https:\/\/ad6dm.net\/log\/category\/digital\/"},"img":{"alt_text":"Regedits for VARA FM COM ports","src":"https:\/\/i0.wp.com\/ad6dm.net\/log\/wp-content\/uploads\/2021\/09\/Screenshot-2021-09-07-123043.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/ad6dm.net\/log\/wp-content\/uploads\/2021\/09\/Screenshot-2021-09-07-123043.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/ad6dm.net\/log\/wp-content\/uploads\/2021\/09\/Screenshot-2021-09-07-123043.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/ad6dm.net\/log\/wp-content\/uploads\/2021\/09\/Screenshot-2021-09-07-123043.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":443,"url":"https:\/\/ad6dm.net\/log\/2018\/03\/choosing-the-next-rig\/","url_meta":{"origin":251,"position":1},"title":"Choosing the Next Rig","author":"AD6DM","date":"March 17, 2018","format":false,"excerpt":"In my quest to find the next portable rig (I already decided), I made a comparison sheet with stats about the various rigs I was considering. Here is my portable rig matrix (including handhelds). Hopefully this list could be of help to others. \ufeff\ufeff Bear in mind, I had specific\u2026","rel":"","context":"In "Antennas"","block_context":{"text":"Antennas","link":"https:\/\/ad6dm.net\/log\/category\/antennas\/"},"img":{"alt_text":"New RS-918SSB","src":"https:\/\/i0.wp.com\/ad6dm.net\/log\/wp-content\/uploads\/2018\/03\/IMG_5734-1024x768.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/ad6dm.net\/log\/wp-content\/uploads\/2018\/03\/IMG_5734-1024x768.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/ad6dm.net\/log\/wp-content\/uploads\/2018\/03\/IMG_5734-1024x768.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/ad6dm.net\/log\/wp-content\/uploads\/2018\/03\/IMG_5734-1024x768.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":474,"url":"https:\/\/ad6dm.net\/log\/2018\/04\/sent-first-sstv-image\/","url_meta":{"origin":251,"position":2},"title":"Sent first SSTV image","author":"AD6DM","date":"April 4, 2018","format":false,"excerpt":"Using\u00a0SSTV for iOS\u00a0on my phone and a\u00a0BTECH APRS-K1 Audio Interface Cable\u00a0(albeit connected to a Kenwood TH-D74A), I just sent my first SSTV image on 145.510 MHz FM simplex. I don't think anyone heard, but it was a proof of concept exercise. I recorded the transmission on a separate handheld, using\u2026","rel":"","context":"In "Digital"","block_context":{"text":"Digital","link":"https:\/\/ad6dm.net\/log\/category\/digital\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":684,"url":"https:\/\/ad6dm.net\/log\/2018\/12\/projects-2018\/","url_meta":{"origin":251,"position":3},"title":"Projects 2018","author":"AD6DM","date":"December 31, 2018","format":false,"excerpt":"This past year was an eventful ham radio one. As I begin to look ahead to goals and daydreams of 2019, it's always good to not expect the past to be the norm, but to take a moment and appreciate all the stuff that's happened good and bad. Thinking back,\u2026","rel":"","context":"In "Elmer"","block_context":{"text":"Elmer","link":"https:\/\/ad6dm.net\/log\/category\/elmer\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/ad6dm.net\/log\/wp-content\/uploads\/2018\/12\/Southwest_050216.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/ad6dm.net\/log\/wp-content\/uploads\/2018\/12\/Southwest_050216.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/ad6dm.net\/log\/wp-content\/uploads\/2018\/12\/Southwest_050216.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":327,"url":"https:\/\/ad6dm.net\/log\/2018\/01\/80m-rtty\/","url_meta":{"origin":251,"position":4},"title":"80m RTTY","author":"AD6DM","date":"January 11, 2018","format":false,"excerpt":"I found a load of RTTY on 80m band on Sunday night (1\/7\/2018). I tuned to 3580 kHz and found a particularly strong signal, so I hooked up my USB soundcard to my laptop, fired up fldigi and made attempts to reply, but I guess my QRP setup didn't get\u2026","rel":"","context":"In "Digital"","block_context":{"text":"Digital","link":"https:\/\/ad6dm.net\/log\/category\/digital\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":982,"url":"https:\/\/ad6dm.net\/log\/2020\/07\/some-number-stations-sunday-morning\/","url_meta":{"origin":251,"position":5},"title":"Some Number Stations Sunday Morning","author":"AD6DM","date":"July 26, 2020","format":false,"excerpt":"This morning I thought I'd search for number stations on the bands. According to Priyom.com, Number stations are shortwave transmissions from foreign intelligence agencies to spies in the field of foreign countries. They carry encrypted messages in form of groups of numbers or letters, using either automated voice, Morse code,\u2026","rel":"","context":"In "CW"","block_context":{"text":"CW","link":"https:\/\/ad6dm.net\/log\/category\/cw\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/ad6dm.net\/log\/wp-json\/wp\/v2\/posts\/251","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ad6dm.net\/log\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ad6dm.net\/log\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ad6dm.net\/log\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ad6dm.net\/log\/wp-json\/wp\/v2\/comments?post=251"}],"version-history":[{"count":2,"href":"https:\/\/ad6dm.net\/log\/wp-json\/wp\/v2\/posts\/251\/revisions"}],"predecessor-version":[{"id":256,"href":"https:\/\/ad6dm.net\/log\/wp-json\/wp\/v2\/posts\/251\/revisions\/256"}],"wp:attachment":[{"href":"https:\/\/ad6dm.net\/log\/wp-json\/wp\/v2\/media?parent=251"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ad6dm.net\/log\/wp-json\/wp\/v2\/categories?post=251"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ad6dm.net\/log\/wp-json\/wp\/v2\/tags?post=251"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}