http://w5tsu.net/tags/post/ Recent content in post on W5TSU Hugo -- gohugo.io en-US Copyright 2017 Mark Grennan Tue, 17 Feb 2026 10:48:05 -0600 http://w5tsu.net/welcome/ Mon, 01 Jan 0001 00:00:00 +0000 http://w5tsu.net/welcome/ Hello, my name is Mark (W5TSU). I became a hame in Feburary of 2007 as KD5AMB (tech). I now have a general class license. (Working on my Extra. :-) I enjoy electronics and amature radio. This website, is my way of keeping notes and sharing with others. If you want to ask questions you can email me at ‘mark@w5tsu.net’. My primary intrests are Software Defined Radio (SDR) and antennas. I’m an open source software eveloper. http://w5tsu.net/posts/hermes-lite2/ Tue, 17 Feb 2026 10:48:05 -0600 http://w5tsu.net/posts/hermes-lite2/ The Hermes-Lite 2 (HL2) is a low-cost, open source HF SDR transceiver. This is a truly fantastic radio it competing head to head with the Flex radio. The whole project – hardware and software – is fully open source, led by Steve Haynal (KF7O). Although this radio has been around for years the community support is poor. My hope is this post will help document what I’ve found for my own use and maybe help others. http://w5tsu.net/posts/going-dmr/ Thu, 18 Aug 2022 12:51:00 -0500 http://w5tsu.net/posts/going-dmr/ Not your father’s radio! I’ve started with a couple of new radios for this round of Ham Radio projects. A Radioddity G90 and their GD-88. As a fan of SDR, I’m using digital modes with both. FT8 on the G90 and DMR on the GD-88. I love the way FT8 cuts through the noise when signal are low. But I can’t yet say I’m a fan of DMR. It seems like a radio build by a government committee that didn’t know anything about it. http://w5tsu.net/posts/repeterbook.com/ Wed, 22 Jan 2020 12:51:00 -0500 http://w5tsu.net/posts/repeterbook.com/ If you need to program your HT for a local area, look no feather than RepeterBook.com. After creating an account, you can build a list of repeaters based on your location and export it to many common file formats, including Chirp and CSV. W5TSU http://w5tsu.net/builds/am-broadcast-band-filter/ Sun, 23 Jul 2017 11:06:17 -0500 http://w5tsu.net/builds/am-broadcast-band-filter/ For the W5TSU.net:8030 receiver I build a broadcast band filter. This should front end overload and intermod created by these stations and allow for better Ham band receiption. I also wanted to learn how to build my own coils. I found a design at the vk3il blog. This filter was modeled with the ELSIE (free version). It is a 7-pole Chebychev filter with cutoff frequencies of 1.7MHz. I started by winding some coils from 22, 26 and 30 awg magnet wire. http://w5tsu.net/builds/aprs-transmitter/ Tue, 20 Jun 2017 12:49:15 -0500 http://w5tsu.net/builds/aprs-transmitter/ I’m working on the design of a APRS Tracker transmitter. The dream is a self contained radio transmitter, modem, and controler with a bluetool connection to a tablet running Xastir. There are lots of designs and APRS Trackers. Some are almost what I’m looking for. Many are out of date or the designer is dormant. The bigest example is MicroModem. Wounderful design from 2014 but the deveoper is… In his how words… “Long Time, No See”. http://w5tsu.net/posts/w5tsu-started-in-1951/ Mon, 22 May 2017 14:06:47 -0500 http://w5tsu.net/posts/w5tsu-started-in-1951/ This is my grandfather’s ham license from 1952. My mother told me stories of her and her father lessioning to the radio. Him teaching her morse code. I picture in my mind, mon sitting on her fathers lap and her talking to some ham on AM. My mother tough me my name in code when I was five. – .- .-. -.- W5TSU http://w5tsu.net/posts/new-wspr-station/ Sun, 21 May 2017 21:28:31 -0500 http://w5tsu.net/posts/new-wspr-station/ I’m fascinated by the WSPR (http://wsprnet.org) network and found out you can build a transmitter station with an Raspberry Pi. So, because I have a few Raspbery Pi comptuers setting about doing nothing, it’s time to put one to work. The code for this is at (https://github.com/JamesP6000/WsprryPi). WSPR net has some documentation on it (http://wsprnet.org/drupal/node/5353). The output from the RaspPi is a square wave so lots of filter is needed. (http://www. http://w5tsu.net/posts/kiwisdr/ Fri, 11 Jul 2014 11:54:24 +0200 http://w5tsu.net/posts/kiwisdr/ Start here: http://sdr.w5tsu.net:8073 ( Kiwi SDR ) http://sdr.w5tsu.net:8074 ( Kiwi SDR ) http://sdr.w5tsu.net:8075 ( OpenWebRX ) This includes both HF, VHF, and UHF I have a new radio. I picked up a KiwiSDR (http://kiwisdr.com/) receiver from Seeed. (https://www.seeedstudio.com/KiwiSDR-Kit-p-2725.html). The KiwiSDR was developed by the Funkamateur John Seamons ZL / KF6VO, is a branch of the OpenWebSDR project and realy started life as a kickstarter project. This is the best HF (10kz-30mz) receiver I own.