2017 Noted by: Bojan S53DZ 1. 0. For an follow-up article, see this link. What, exactly the "F" stands for is up to you, but the sentiment is the same, regardless: Too many fun projects, too little ($#!+) time! This radio is definitely NOT a kit. Jan 27, 2015 · Update on the mcHF - Adding more features (Part 2) - Implementing audio filters and fractional I/Q phase adjustments The front panel display of the mcHF SDR transceiver, an entirely self-contained all-mode HF transceiver based on open-source software. I corrected that, got excellent results all across the transmit range of the MCHF (0. 48 v 55 - RX/TX Freq XLATE TX IQ PA Bias Cal Output (W) Current (A) Cal Output (W) Current (A) Cal Output (W) Current (A) Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. 7 from DF8OE. 5 being available from the AE5X web site. org KA7OEI ARDF page-This page provides a point-of-reference for various Amateur Radio Direction Finding topics - particularly for pages relating to the Montreal I, II and III Doppler DF units by VE2EMM - including "alternate" firmware for those units that can provide additional functionality. A (semi)-typical suburban E-field whip receive system for the 630 and 2200 meter bands - link . It has been a few months since I have posted anything on the mcHF transceiver (my previous post may be found here - link) so unless you have been following the mcHF Yahoo group (link - membership required) you would be forgiven for thinking that I had abandoned work on it. Jeg har her lagt nogle af de filer jeg brugte til mit arbejde med mcHF radioen. The more I operated the mcHF, the more I realized that the KX2 would see more operation from someone else's shack (tent, trail, mountaintop) than I was likely ever to provide it. Jan 17, 2013 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. To do this, configure the transceiver as Nov 14, 2016 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. org Wednesday, September 17, 2014 Assembling the mcHF transceiver boards - getting ready. Soldering and Assembly. So using the supplied wire and BN43-202 core, start with pushing one turn Jun 9, 2019 · Yesterday, a work party went to the remote HF station of the Utah Amateur radio club to install a new antenna for the lower HF bands. Visit UHSDR Project on GitHub. LCD screen looks much better on higher resolution. 26 20151028 Preface: This manual is for the mcHF transceiver, the original design by Chris Atanassov, M0NKA, as an open-source SDR (Software Defined Radio), both in terms of Software and Hardware. 25"L x 4. " KA7OEI, Clint Turner. As such, the features of this transceiver will continue to evolve and this manual. Aug 7, 2012 · For the WWVB's code, the second begins precisely when the carrier amplitude drops and those bits in which the carrier stays low for 0. As such, the features mchf WIKI, bugtracking-system and firmware with configuration files for use with Eclipse, CoIDE and makefile - GitHub - S52CQ/mchf-github: mchf WIKI, bugtracking-system and firmware with configurat Aug 30, 2023 · At normal "room" temperatures (68F/20C) the thermal properties of the RX-888 Mk2 are likely "Okay" if run at just 65-70 Msps - but increasingly marginal above this. Oct 18, 2018 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. KA7OEI's blog Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. org Tuesday, August 14, 2012 A more practical capacitor-Powered Flashlight Dec 26, 2019 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. T he Yaesu FT-817 is an extremely portable HF through UHF all-mode transceiver, capable of operation on all amateur bands from 160 meters through 70 cm (excluding, unfortunately, 222 MHz. 5625"W x 2. 6. 219. In February 2017 both agreed to change firmware license to GPLv3. org Thursday, February 14, 2019 A 2 meter and 222 MHz low-pass filter for the SocoTran ST-7900D mchf WIKI, bugtracking-system and firmware with configuration files for use with Eclipse, CoIDE and makefile - HB9ocq/mchf-github. 8) 2. The base of the firmware was started by Chris, M0NKA, and Clint, KA7OEI as part of the mcHF project. Jan 19, 2016 · It looked simple enough. On several RX-888s, the temperature of the A/D converter and other components was fairly high, but not alarmingly so, although this seemed to vary among samples (e. Dec 13, 2023 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. Please note, you have to run the display in parallel mode. Jan 30, 2015 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. org Friday, January 30, 2015 Updated version of the "Simple" PWM LED/Laser modulator {"payload":{"allShortcutsEnabled":false,"path":"/","repo":{"id":31082982,"defaultBranch":"master","name":"mcHF","ownerLogin":"imoldovavan","currentUserCanPush":false Oct 28, 2015 · Saved searches Use saved searches to filter your results more quickly Sep 17, 2014 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. S. This section describes the assembly of the mcHF kit bought 2021 from Chris (M0NKA), SMD parts soldered, with metal enclosure. 1 MHz to just under 1 GHz with the capability of testing receiver sensitivity, transmitter modulation and transmit power - all of this in addition to being a general-purpose The VCXO: The heart of the unit is Y201, a 30. 000. org The base of the firmware was started by Chris, M0NKA, and Clint, KA7OEI as part of the mcHF project. Jan 27, 2015 · The mcHF uses a standard, inexpensive "sound card" type codec (a Wolfson WM8731 or the compatible TLV320AIC23) for all A/D and D/A. "This manual is for the mcHF transceiver, the original design by Chris Atanassov, M0NKA, as an opensource SDR (Software Defined Radio), both in terms of Software and Hardware. Clint (KA7OEI) has also provided a BOM giving part numbers from Mouser, another major US electronics part supplier. tested/branded) but it also had a Peter Dahl "Hypersil" tm power transformer rather than the "just-adequate Jan 22, 2022 · How is this different from the Raspberry Kiwi? Because of its common lineage, the FlyDog SDR is very similar to the Raspberry Kiwi SDR - including the use of the same Linear Technologies 16 bit A/D converter - and unlike the Raspberry SDR that I reviewed before, it seems to report a serial number, albeit in a far different range (in the 8000s) than the "real" KiwiSDRs which seem to be numbered Page 6 For a more thorough explanation of the many features of the mcHF transceiver – particularly the items in the menu – refer to the “mcHF Operators Manual” that is found on the mcHF Yahoo Group in the KA7OEI folder of the FILES section. SDR" dongle (with HF port) as found on Ebay Mar 31, 2024 · As the RX-888 (Mk2) external clock input is directly coupled to its Si5351 clock synthesizer, we have to act as if we are driving that chip directly. May 11, 2019 · I've recently sold my Elecraft KX2; the idea of doing so started occurring soon after receiving my mcHF. It currently supports STM32F4 and STM32F7 MCU based QSD designs. The transmit converter is broadband, capable of operating from below 100 kHz to at least 500 kHz which means that one need only provide appropriate matching and low-pass filters to operate on either band. . com and modulatedlight. There is also information on a simple PIC-based TDOA Oct 22, 2020 · Thanks for this explanation! I'm always looking for new ways to automatically decode additional digital modes. Feb 8, 2021 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. DF8OE, Andreas. ) Dec 20, 2020 · The 10 MHz input - which can come from a GPS Disciplined Oscillator (GPSDO), a 10 MHz oven-controlled oscillator (OCXO) or a Rubidium source - is input to and amplified by Q101 to a logic level and buffered by U1a, one section of a 74HC86 quad XOR gate. 8 seconds (e. Thanks to the Open Source Approach (now with the GPLv3 license) the mcHF firmware has been extended in this project with new functionality and also with support for use on different transceiver hardware. [End] This page stolen from "ka7oei. org Wednesday, August 14, 2019 Revisiting the limited attenuation high-pass filter for the KiwiSDR (or SDRPlay, RTL-SDR Dongle, Fun Cube, or other SDR receivers) Nov 16, 2022 · In an earlier blog post (Fixing the CAT Systems DL-1000 and PT-1000 repeater audio delay boards - LINK) I discussed the modification of a PT2399-based audio delay line for use with the CAT-1000 repeater controller - and I also hinted that it would be possible to take an inexpensive, off-the-shelf PT2399-based audio effects (echo/reverb) board and convert it into just a delay board. E. The Group moderators are responsible for maintaining their community and can address these issues. 2" LCD used at mcHF 0. YAFP - The mcHF SDR HF Transceiver. Figure 1: The MedFER beacon and vertical, tophatted antenna on the metal roof of my house, attached to an evaporative ("swamp") cool Dec 3, 2021 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. Nov 9, 2015 · Earlier this year I picked up a Heathkit HL2200 amplifier (the newer, "brown" version of the SB-220) at a local swap meet for a reasonable price. org Thursday, October 18, 2018 A quick (and probably incomplete) guide to getting kiwirecorder and kiwiwspr (now wsprdaemon) running on Linux May 31, 2015 · There are two "flavors" of the mcHF: The early units used LCDs with "SPI" (high speed Serial) interfaces while the current crop (and by far the majority) use a parallel interface that physically maps the display's RAM to the processor's I/O controller so that it sees it as RAM - plus, it can access the display's normal commands with 16 bit-wide - start: I used mcHF Firmware Source 219. mchf WIKI, bugtracking-system and firmware with configuration files for use with Eclipse, CoIDE and makefile - oz9hi/mchf-github KA7OEI, Clint DF8OE, Andreas Nov 20, 2015 · In a future posting I'll describe how the the modulation part of this feature was accomplished on the mcHF along with the pre-emphasis of audio, filtering and the generation of burst and subaudible tones. When I reassembled and tested everything, I was getting poor output power shown on my oscilloscope, so I checked again and found I wound T5 wrong. based on a document from Clint Turner, KA7OEI. While not directly specified in the Si5351 data sheets (at least the ones that I have found) testing done my myself indicates that a capacitively-coupled sine of about 750 millivolts peak-peak will trigger the '5351 reliably: A bit of looking in Jan 7, 2019 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. Dec 3, 2021 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. 2 MHz fundamental mode crystal in a Colpitts oscillator. In the past I have stated several times on the Yahoo Group that I would not be adding FM to the mcHF (a completely stand-alone QRP SDR HF transceiver) any time soon, mostly because I was quite certain that there was simply not enough processor horsepower to do it properly, but quite recently I (sort of) got obsessed with making it work, going from "0 to 60" in just a few evenings of code Mar 31, 2014 · This is a curious little device - of which several have fallen into my hands. At the site was an existing G5RV-type antenna which provided coverage on 80, 40, 20 and 10 meters (more or less) - but it didn't provide 160 meter coverage (mostly useful during winter months, after sunset) and this G5RV was not taking full advantage of the 65 Sep 28, 2015 · Are you receiving emails from a Groups. Updated for firmware version 0. mcHF Hardware modifications as of April 29, 2015 as compiled by KA7OEI for Version 0. g. Først BOM filer: Mar 21, 2017 · The rarity of the 1L6: Owners of the classic Zenith Transoceanic radios from the early-mid 50's will probably be aware of the pain involved if they have to buy a 1L6 tube (or "valve") for their beloved radio: A "good" 1L6 - seemingly the tube that goes bad most often in these radios - can fetch up to $60 today, a significant fraction of what one might have paid for a second-hand radio to restore. 4 RF boards Comment to new builders – PLEASE READ: It is strongly recommended that new builders do not make these board modifications, other than those Oct 6, 2015 · This is a strange-looking antenna in either its original round ("ring-and-stub") form (Figure 1) or the easier-to-build "square" shape seen in Figure 2. LY2HT vertimas. org Wednesday, October 1, 2014 What to do if your IFR 1200 Service Monitor display just shows "@" signs on the display - and if your deviation meter goes non-linear Initially consulting the low-pass filter tables in an ARRL Amateur Radio Handbook and rescaling the values for the desired frequency, I entered the filter in LTSpice and juggled standard inductor and standard capacitor values that I had in my parts collection until I found a design that was a reasonable performer using more-or-less standard components. The current firmware provides receive and transmit for various analog modes (SSB,AM, FM) including modes like Synchronous AM, plus digital modes like FreeDV, RTTY and of course CW (including Iambic/Ultimatic keyer). About. D. This is a 16 bit device capable of a number of sample rates from 8 to 96 ksps ( K ilo S amples P er S econd) , but in the mcHF it is typically operated at 48 ksps , this to allow the visualization of the spectrum Nov 6, 2017 · Approximate Specifications of the mcHF Transceiver for Firmware Version 0. 3/4 UI and Version 0. org Thursday, December 26, 2019 Using TV (F-connector) 75 ohm splitters and taps in 50 ohm systems on the amateur HF, VHF and UHF bands KA7OEI ARDF page-This page provides a point-of-reference for various Amateur Radio Direction Finding topics - particularly for pages relating to the Montreal I, II and III Doppler DF units by VE2EMM - including "alternate" firmware for those units that can provide additional functionality. But what works well for the first three functions isn't (IMO) necessarily good for VFO functionality. Turner, KA7OEI Preface: This manual is for the mcHF transceiver, the original design by Chris Atanassov, M0NKA, as an opensource SDR (Software Defined Radio), both in terms of Software and Hardware. org Monday, January 7, 2019 Electrically driving a mechanical speedometer from a remote wheel sensor using a motor and PID loop mchf WIKI, bugtracking-system and firmware with configuration files for use with Eclipse, CoIDE and makefile - do7jbh/mchf-github Dec 6, 2017 · Figure 2: Block diagram of the 630 and 2200 meter transmit chain. Diagrammer og BOM filer. 3 installed boot loader v. org Wednesday, December 13, 2023 "TDOA" direction finder systems - Part 2 - Determining signal bearing from switching antennas in software. Using D201, a varactor diode (approx. Front Panel controls: Jan 28, 2013 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. 125"H (185mm x 118mm x 54mm) in size with two good-quality "N" type connectors connected with short lengths of UT-141 PTFE cable and an board-mounted "F" connector. 19 from Clint KA7OEI as base of new mchf-firmware-community working with GITHUB It currently supports STM32F4 and STM32F7 MCU based QSD designs. org Friday, May 31, 2019 Revisiting the 20 meter "helical resonator" band-pass/notch filters Using the mcHF with computer “Sound Card” modes via the Line-Input and Line-Output connections: The mcHF may be connected to a computer, tablet or smart phone via audio cables and the PTT line on the Microphone cable to allow modes such as SSTV, PSK31, WSPR or other digital “Sound Card” mode. io group but have never visited the Groups. Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. mcHF basic specifications (from KA7OEI) Frequency range: (1. 9. 3v @ 150mA) are wired in parallel on the low side with one end of the filament grounded while the 6K6 (400mA), 6S7 (150mA) and 6E5 (300mA) are wired in parallel on the high side Jul 1, 2020 · Report to Moderators I think this message isn't appropriate for our group. 8 volts while also isolating the power mains from the DC output. As such, the features In a future posting I'll describe how the the modulation part of this feature was accomplished on the mcHF along with the pre-emphasis of audio, filtering and the generation of burst and subaudible tones. 3v @ 300ma) - which is also more sensitive than the 6N5, giving a bit more deflection. Improving the thermal management of the RX-888 (Mk2) - link - This page talks about highly recommended modifications to the RX-888 to reduce internal heat to improve reliability. Transformatorius T5. io website? You probably don't have a password set up yet. UHSDR means UniversalHamSDR and consists of a firmware and bootloader part. The 6T7 (150mA), 6A8 (300mA) and the #47 dial lamp (6. The base of the firmware was started by Chris, M0NKA, and Clint, KA7OEI and was exclusively used for mcHF QRP transceiver designed by Chris. Filer til mcHF. 第一卷胶卷终于洗好了 学嵌入式遇到的坑 我为什么写博客 Linux中一些有意思的软件 研究研究SpaceX星舰 那些课本中的意难平 mcHF电台原理浅析 分享一些好看有趣的项目 Flipper Zero复刻计划 入坑穿越机寄录 {"payload":{"allShortcutsEnabled":false,"fileTree":{"mchf-eclipse/useful_manuals/oldguides":{"items":[{"name":"mcHF_Operators_Manual_firmware_ver_0_0_219_26. As such, the features KA7OEI's blog mchf WIKI, bugtracking-system and firmware with configuration files for use with Eclipse, CoIDE and makefile - DG9BFC/mchf-github KA7OEI, Clint DF8OE, Andreas The annual "Homebrew" meeting of the Utah Amateur Radio club meeting was coming up and while I was going to show off what I'd done thusfar on my mcHF transceiver - link I wanted something else that was a bit more "fun" and a very quick build, preferably one that could also give a signal to hear on the transceiver at the same time. Aug 31, 2012 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. 26) and is partially outdated by our continuous work on the Mar 7, 2015 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. com". org Friday, December 3, 2021 The case of the Clicky Carrier - Likely high-frequency trading (that can sometimes clobber the upper part of 20 meters) The base of the firmware was started by Chris, M0NKA, and Clint, KA7OEI as part of the mcHF project. com</u></b The base of the firmware was started by Chris, M0NKA, and Clint, KA7OEI as part of the mcHF project. For those with mcHF & RTC (which demands use of SPI display . mchf WIKI, bugtracking-system and firmware with configuration files for use with Eclipse, CoIDE and makefile - dm6tt/mchf-github. Last update: 20160720. mchf WIKI, bugtracking-system and firmware with configuration files for use with Eclipse, CoIDE and makefile Resources The KA7OEI FT-817 pages A Front-panel view of the FT-817 sitting atop the switching regulator described below , tuned to my "MedFER" beacon. mcHF - HF SDR QRP transceiver S53DZ Status Report Rev 16 Project: mcHF - HF SDR QRP RTX by Chris M0NKA Modifications: FW: Chris M0NKA, Clint KA7OEI, Andreas DF8OE HW: Clint KA7OEI, Paolo IZ6MAF, Andreas DF8OE Date: 26. pdf Mar 25, 2021 · The following part provides you with information how to operate and maintain a UHSDR TRX. <i>Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at <a href="http://ka7oei. Turner, KA7OEI. KA7OEI now QRV on 630 and 2200 meters - This page describes the actual use of this transmit converter as well as a practical matching network and antenna system. At first my teenage brain puzzled over the plate and low voltage (250 volt) supply portions of the diagram, noting the seemingly-odd wiring of the diodes and capacitors, but the circuit description noted that these were voltage doublers and a quick check with my ARRL Radio Amateur's Handbook explained how this circuit worked. Running on 480x320 gives waterfall and scope using full display width and all other elements are placed in a much smoother way. Turner, KA7OEI Preface: This manual is for the mcHF transceiver, the original design by Chris Atanassov, M0NKA, as an open-source SDR (Software Defined Radio), both in terms of Software and Hardware. Oct 5, 2012 · Several weeks ago a friend of mine gave me his old Cushman CE-50A service monitor - a "Swiss army knife" piece of test equipment used for testing and evaluating 2-way radios, receivers and transmitters over the range 0. Apr 12, 2021 · When I reassembled and tested everything, I was getting poor output power shown on my oscilloscope, so I checked again and found I wound T5 wrong. Oct 15, 2014 · The annual "Homebrew" meeting of the Utah Amateur Radio club meeting was coming up and while I was going to show off what I'd done thusfar on my mcHF transceiver - link I wanted something else that was a bit more "fun" and a very quick build, preferably one that could also give a signal to hear on the transceiver at the same time. some seemed worse than others. blogspot. 19 20150730 Prepared by C. Contribute to imoldovavan/mcHF development by creating an account on GitHub. A. Where to get the compiler and the various utilities. He set out to design an inexpensive and small SDR HF home-brew radio back in 2013. This is a 7-element Elliptical (Cauer) filter centered at 7. 5-20pF) its frequency is made variable, the center of the electronic tuning range being adjusted by trimmer capacitor C201. As such, the features I blew my F1 fuse with reverse voltage! While I had the case apart replacing it, I decided to do the T5 and T7 mods as described by KA7OEI in the files section. 2 second carrier at full power) are the position marker bits that are used to identify the various portions of the data frame. Tester Data of test Input Volts 13. Filter Design" program, version 4. The document from Clint is based on a very old mcHF firmware version (0. mchf WIKI, bugtracking-system and firmware with configuration files for use with Eclipse, CoIDE and makefile - OE1FHB/mchf-github KA7OEI, Clint DF8OE, Andreas Jul 31, 2023 · Magic Eye tube: The original 6N5 (6. 14 and then installed mchf_firm_0_219_26_4_ka7oei. In February 2017 all partners agreed to move firmware license to GPLv3. 211. org Friday, December 3, 2021 The case of the Clicky Carrier - Likely high-frequency trading (that can sometimes clobber the upper part of 20 meters) mchf WIKI, bugtracking-system and firmware with configuration files for use with Eclipse, CoIDE and makefile - G4KCM/mchf-github The base of the firmware was started by Chris, M0NKA, and Clint, KA7OEI as part of the mcHF project. This manual is created for put all the information spread in the WWW into one place and maintain it up-to-date with new additions done in the new Hi Guys I have just completed my MCHF v0. Looking up the stock encoder on Mouser reveals a list of similar parts of the same brand, size and pinout. org Monday, November 14, 2016 "TDOA" direction finder systems - Part 1 - how they work, and a few examples. What made it particularly attractive was that it not only had a pair of new, graphic 3-500Z tubes in (Chinese-made, but RF-Parts Inc. mchf WIKI, bugtracking-system and firmware with configuration files for use with Eclipse, CoIDE and makefile - GitHub - pa7n/mchf-github: mchf WIKI, bugtracking-system and firmware with configurati Sep 17, 2014 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. 5 to 30MHz TX max RF power: 10W (nominal 5W) RX sensitivity: -126dBm (0,11uV) at BW 300Hz Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. Go back to the KA7OEI Microwave page This page and its contents copyright 2010-20156by Clint, KA7OEI. Oct 1, 2014 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. Because of this the mcHF firmware has been extended in this project with new functionality and also with support for use on different transceiver hardware. UHSDR means U niversal H am SDR and consists of a firmware and bootloader part. 3v @ 150mA) was replaced with a 6E5 (6. org May 8, 2020 · It turns out that all four encoders used in the mcHF are of the same exact part number. KA7OEI, Clint. 5 to 30MHz 1. On T1, a single 5 volt winding is the audio input and the series 120 volt primaries, wired as if for a 240 volt connection, is used as a center-tapped winding 1. zip radio powers on green led lit and you can hear relays clicking as you go band + - but WHITE SCREEN i have checked continuity between cpu and screen all ok jumpers on screen set to spi and tried other spi mode no difference bit confusing as 1=open 0=short so i have May 9, 2020 · Figure 3: Schematic of the 40 meter bandpass filter. Initially the software […] The base of the firmware was started by Chris, M0NKA, and Clint, KA7OEI as part of the mcHF project. No real attempt was made to make this filter's input and output impedances "flat" across the entire HF spectrum - and to be sure, below about 14 MHz its input impedance a bit high, but this will have little practical effect on its Nov 17, 2019 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. org Thursday, January 17, 2013 Two repeaters, one frequency (part 4) - Voting receivers Oct 28, 2015 · My attempt to modify code. new 3. ) v 0. org Sunday, February 7, 2021 RFI (Radio Frequency Interference) sleuthing with the TinySA - Part 1: The gear Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. Operator's Manual for the mcHF transceiver Updated for firmware version 0. 217 edit. org Tuesday, October 17, 2017 A 10 MHz OCXO (Oven-controlled Crystal Oscillator) ######################################################################### ######################################################################### ## ## ## This file Feb 24, 2024 · Recently, a Kenwood TS-850S - a radio from the mid-early 1990s - crossed my workbench. It was originally designed with the aid of the "A. See this as an attempt to move away from the very nice mcHF manual made by Clint, KA7OEI, which you can find here. There is also information on a simple PIC-based TDOA I blew my F1 fuse with reverse voltage! While I had the case apart replacing it, I decided to do the T5 and T7 mods as described by KA7OEI in the files section. 26 20151028 Prepared by C. Sep 4, 2013 · Here, we have the switcher's output circuit: A high-power oscillator running in the 30-60 kHz range feeding a transformer that converts the voltage from the 150-300 volts of rectified and filtered AC line input, down to the 13. org Monday, January 28, 2013 An L/C audio bandpass filter using cheap audio transformers Jun 18, 2018 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. only a 0. org Monday, October 28, 2013 Repair of the speedometer on a Polaris Sportsman 500 4-wheeler Oct 2, 2014 · Here is the latest firmware modded by K Aug 24, 2018 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. As noted in the earlier article, the round version had been used for FM broadcast use but the bending of round elements (not to mention inputting the model into NEC2 manually!) was deemed to be too difficult for "amateur" construction so it was mchf WIKI, bugtracking-system and firmware with configuration files for use with Eclipse, CoIDE and makefile - BI3MEK/mchf-github KA7OEI, Clint DF8OE, Andreas T5 guide courtesy of Clint(KA7OEI) Winding of T7 (original mcHF transformer) It only makes sense to make T7 in its original form, so you can fully test the functionality of the built mcHF, then make the suggested modified transformer that improves the radio performance. T5 guide courtesy of Clint(KA7OEI) Winding of T7 (original mcHF transformer) It only makes sense to make T7 in its original form, so you can fully test the functionality of the built mcHF, then make the suggested modified transformer that improves the radio performance. Use the Email me a link Operator's Manual for the mcHF transceiver Updated for firmware version 0. org Friday, August 31, 2012 Problems with Lithium Iron Phosphate (LiFePO4) Batteries Operator's Manual for the mcHF transceiver Updated for firmware version 0. 15 MHz - the middle of the U. Contribute to sp9bsl/mcHF development by creating an account on GitHub. QRP SDR mcHF MINI TRANSIVERIS KA7OEI REKOMENDACIJOS DĖL TOBULESNIŲ mcHF PA AD TRANSFORMATORI Ų. com"><b><u>ka7oei. Straipsnio autorius Visiems gaminantiems mcHF M0NKA transiverį linkiu gerų emocijų. 40 meter amateur band. Prepared by C. 5 to 30MHz TX max RF power: 10W (nominal 5W) RX sensitivity: -126dBm (0,11uV) at BW 300Hz KA7OEI's blog Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. Jun 18, 2018 · The diagram above, as rendered by "LT Spice", depicts the load (the receiver) as R2, a 50 ohm resistor - and this is not an actual component that would be installed. The mcHF-QRP is a capable HF transceiver created by Chris, M0NKA. Often available on EvilBay for fairly cheap, these are in some nice, die-cast Hammond (tm) aluminum boxes approximately 7. org Saturday, May 22, 2021 Characterizing the RTL-SDR Blog (Version 3) for HF reception using the "direct" input. I've built a multi, digital mode reporting system (FT8, FT4, JT9, WSPR) that runs on Windows around the jt9 and wsprd command line apps that works in conjunction with my RedPitaya SDR running Pavel's HPSDR code, which provides for 8 simultaneous bands @ 192 KHz b/w. org Monday, September 4, 2023 Measuring signal dynamics of the RX-888 (Mk2) Article by LB5ZH, Geir Inge. org Saturday, March 7, 2015 Using the "RTS. org Friday, August 24, 2018 Preventing a GFCI from tripping on transmitted RF Saved searches Use saved searches to filter your results more quickly KA7OEI's blog Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. Dec 30, 2015 · One of the features that I added to the mcHF many code releases back was that of "Frequency Translation" in which the local oscillator was "off-tuned" from the receive frequency, + or - 6 kHz for the mcHF with the "baseband" signals for receive and transmit being shifted by 6 kHz (in the opposite direction) in software. , both in terms of Software and Hardware. Aug 14, 2012 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. Aparatas vertas jo kainos DERINIMO STALIUKAS ( Sugalvojo ir pagamino LY3MJ Jonas Elektr ėnuose ) Tai tikrai patogus ir reikalingas montažinis staliukas kada reikia derinti ir atlikti įvairius matavimus su SDR mcHF transiveriu. Since 12/2010: Jul 26, 2023 · mcHF电台的一些资料. org Sunday, November 17, 2019 Homebrew construction of 2 and 4 port splitters/combiners for the LF-MF-HF(30 kHz-30 MHz) frequency range. May 15, 2024 · Using an external clock with the RX-888 (Mk2) - link - On this page we detail the sort of signals that it takes to clock an RX-888 from an external source. 27. org Tuesday, May 31, 2016 Audio breakup on the JBL 4315B speaker Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. So using the supplied wire and BN43-202 core, start with pushing one turn Preface: Operator's Manual for the mcHF transceiver. While I'm not in the "repair business", I do fix my own radios, those of close friends, and occasionally those of acquaintances: I've known this person for many years and we have several mutual friends. org Wednesday, July 31, 2024 Rewinding the stainless steel coils with silver-plated copper wire on the JPC-7 and JPC-12 antennas The base of the firmware was started by Chris, M0NKA, and Clint, KA7OEI as part of the mcHF project. Over time the hardware has gone through several iterations, always improving by the group effort of the HAM radio community. 63), and then noticed my SWR meter and Power meter wasn't showing anything. mchf WIKI, bugtracking-system and firmware with configuration files for use with Eclipse, CoIDE and makefile - oz8gw/mchf-github Dec 31, 2016 · Figure 2: Diagram of the push-pull amplifier using 1J18B tubes wired as triodes. Sep 4, 2023 · Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei. tci boi dhdvj oyoau aytmwnt mtb ttyikbrm cpjh sdei zfqmven