Generated by All in One SEO v4.9.9, this is an llms.txt file, used by LLMs to index the site. # QRPblog News, portable adventures and building high-power amplifiers. LDMOS linear kits available in the shop! ## Sitemaps - [XML Sitemap](https://qrpblog.com/sitemap-file.xml): Contains all public & indexable URLs for this website. ## Posts - [A 600W broadband HF amplifier using affordable LDMOS devices](https://qrpblog.com/2019/10/a-600w-broadband-hf-amplifier-using-affordable-ldmos-devices/) - A600 is a 600W HF/VHF linear amplifier project using 2x MRF300 LDMOS transistors. Amplifier kits are available to order and assemble yourself. - [Lightweight beam antennas: Moxon vs Spiderbeam](https://qrpblog.com/2013/02/lightweight-beam-antennas-moxon-vs-spiderbeam/) - [Ampleon ART2K5TPU - new 2.5kW LDMOS transistor for broadband RF power amplifiers](https://qrpblog.com/2024/02/ampleon-art2k5tpu-new-2-5kw-ldmos-transistor-for-broadband-rf-power-amplifiers/) - [Choosing a heatsink for the A600 LDMOS linear amplifier](https://qrpblog.com/2019/12/ldmos-amplifiers-cooling-choosing-the-heatsink/) - Special attention needs to be paid to mounting the transistors on the heatsink: they should be installed on a flat, clean and preferably polished area. - [F600 - a 600W low-pass filter board for 1.8-72MHz](https://qrpblog.com/2019/12/f600-600w-low-pass-filter-board-for-hf-vhf/) - This design offers a practical solution for HF/low-VHF amplifier output filters, handles 600W and is designed to cover all amateur bands form 160m to 4m. - [Icom IC-905 VHF/UHF/SHF SDR transceiver - 144MHz to 10GHz](https://qrpblog.com/2022/08/icom-ic-905-shf-sdr-transceiver-2-4-5-6-10ghz/) - [Elecraft KX3 vs Yaesu FT-817ND](https://qrpblog.com/2013/02/elecraft-kx3-vs-yaesu-ft-817nd/) - [Flex SmartSDR revealed](https://qrpblog.com/2013/02/flex-smartsdr-revealed/) - [DXpedition videos - T33R, T88CJ, VP8SSI, 7J1RL](https://qrpblog.com/2013/03/dxpedition-videos-t33r-t88cj-vp88ssi-7j1rl/) - [X1M - portable chinese HF transceiver](https://qrpblog.com/2013/03/x1m-portable-chinese-hf-transceiver/) - [Developing a HF transceiver around an Arduino - abandoned project](https://qrpblog.com/2013/03/developing-hf-transceiver-around-arduino/) - [HF One MKII - cheap mobile transceiver with SDR technology](https://qrpblog.com/2013/11/hf-one-mkii-cheap-mobile-transceiver-with-sdr-technology/) - [SOTA activation YO/MM-005](https://qrpblog.com/2014/05/sota-activation-yomm-005/) - [SOTA activation YO/EC-049](https://qrpblog.com/2014/07/sota-activation-yoec-049/) - [SOTA marathon in Romania (YO)](https://qrpblog.com/2014/08/sota-marathon-in-romania-yo/) - [SOTA tour YO 2014 - part I](https://qrpblog.com/2014/08/sota-tour-yo-2014-part-i/) - [SOTA Tour YO 2014 - part II](https://qrpblog.com/2014/08/sota-tour-yo-2014-part-ii/) - [SOTA Tour YO 2014 - part III](https://qrpblog.com/2014/08/sota-tour-yo-2014-part-iii/) - [Yaesu FT-991 - replacement for the FT-897](https://qrpblog.com/2014/08/yaesu-ft-991-replacement-for-ft-897/) - Yaesu FT-991 is the next upcoming model from Yaesu. Highlights include 3.5" TFT touch display, a spectrum scope, 32-bit IF DSP, internal antenna tuner and C4FM. - [Ciucas X3 - a good EmComm exercise](https://qrpblog.com/2014/09/ciucas-x3-good-emcomm-exercise/) - Our amateur radio group has provided emergency communications for Ciucas X3 - a yearly trail running event that takes place in Romania's beautiful Ciucas mountains. - [Portable SDR transceiver with integrated VNA and GPS](https://qrpblog.com/2014/10/portable-sdr-transceiver-with-integrated-vna-and-gps/) - Portable SDR transceiver that integrates a Vector Network Analyzer and a GPS module. Covers up to 30MHz plus 144Mhz band. - [Yaesu FT-991 - full details and pricing](https://qrpblog.com/2014/11/yaesu-ft-991-full-details-and-pricing/) - Yaesu FT-991 is an all-band, all-mode radio with integrated tuner, 3.5" TFT touch display and 32-bit IF DSP. - [SOTA activation: YO/EC-520 Seciu peak](https://qrpblog.com/2014/12/sota-activation-yoec-520-seciu-peak/) - Christmas Eve morning caught me in my hometown of Ploiesti; luckily, outside was the clearest and bluest sky I've seen in months, and I immediately thought of the SOTA bag. - [About the Elecraft K3 vs Kenwood TS-590 debate](https://qrpblog.com/2015/01/about-elecraft-k3-vs-kenwood-ts-590/) - While the Kenwood TS-590SG is listed in US shops at the moment around US$1800, the Elecraft K3 starts at US$2400 assembled and it goes up very fast when you add optionals. - [SOTA: gathered season bonus points this weekend](https://qrpblog.com/2015/02/sota-gathered-season-bonus-points-this-weekend/) - I decided to go for two low-effort high-reward 6 point summits I've visited before - only this time I will also collect the seasonal bonuses. - [SOTA activation: YO/EC-090 Malaia and YO/EC-093 Siriu](https://qrpblog.com/2015/05/sota-activation-yoec-090-malaia-and-yoec-093-siriu/) - YO/EC-090 Malaia Peak and YO/EC-093 Siriu Peak are two nearby peaks in the Siriu massif, located about halfway between the cities of Brasov and Buzau. - [YO SOTA Marathon 2015 starting this wekend](https://qrpblog.com/2015/08/yo-sota-marathon-2015-starting-this-wekend/) - The long awaited YO SOTA Marathon2015 will be officially starting on Monday, August 10th 2015, - [Icom reveals first SDR, IC-7300](https://qrpblog.com/2015/08/icom-reveals-first-sdr-ic-7300/) - Saturday, August 22nd 2015, during the Tokyo Ham Fair 2015, Icom revealed their first Software Defined Radio (SDR) HF+6m+4m, 100W transceiver, the IC-7300. - [YO SOTA Marathon 2015 - the story](https://qrpblog.com/2015/08/yo-sota-marathon-2015-story/) - This was a natural evolution to the YO SOTA Tour 2014 from last year, only this time we decided to make it bigger, better, longer and harder. - [YO SOTA Marathon 2015 - the story II](https://qrpblog.com/2015/09/yo-sota-marathon-2015-the-story-ii/) - This article is a sequel to YO SOTA Marathon - the story - [YO SOTA Marathon 2015 - the story III](https://qrpblog.com/2015/09/yo-sota-marathon-2015-story-iii/) - This article is a sequel to YO SOTA Marathon - the story II. - [YO SOTA Marathon 2015 - the story IV](https://qrpblog.com/2015/09/yo-sota-marathon-2015-story-iv/) - This article is a sequel to YO SOTA Marathon 2015 - the story III. - [Icom IC-7300 available in January, official price announced](https://qrpblog.com/2015/12/icom-ic-7300-available-in-january-official-price-announced/) - Icom's IC-7300 is probably the most expected transceiver of 2016, given the fact that it's the first direct-sampling SDR from one of the "big three" manufacturers. - [SunSDR MB-1 listed and available in January](https://qrpblog.com/2015/12/sunsdr-mb-1-listed-and-available-in-january/) - SunSDR MB-1 made by Expert Electronics seemes to be exactly what the amateur radio market lacked: modern technology. HF/VHF SDR radio. - [Yaesu FT-817, Elecraft KX-3 and other portable HF radios](https://qrpblog.com/2015/12/yaesu-ft-817-elecraft-kx-3-and-other-hf-radios/) - A list of popular portable / SOTA HF radios and first hand opinions on most of them. Yaesu FT-817, Elecraft KX-3 and more. - [World's smallest APRS transceiver](https://qrpblog.com/2016/01/worlds-smallest-aprs-transceiver/) - DB1NTO managed to create the smallest APRS transceiver in the world, based on the very small and cheap Dorji DRA818V. - [Icom IC-7300 first impressions from AB4BJ](https://qrpblog.com/2016/02/icom-ic-7300-first-impressions-from-ab4bj/) - William AB4BJ managed to get his hands on an Icom IC-7300, play around with it a little and post a few videos, enough for us to get a better idea on what the IC-7300 can do. - [Icom IC-7300 available in Japan](https://qrpblog.com/2016/02/icom-ic-7300-available-in-japan/) - Icom IC-7300 is already available in Japan and indeed it's surprisingly affordable. - [Nice external power pack for SOTA](https://qrpblog.com/2016/02/nice-external-power-pack-for-sota/) - Goal Zero Sherpa 50 weights only 544 grams and has 5V USB, 19V@5A (to recharge laptops) as well as 12V@ 8A (more than enough for any QRP transceiver) outputs. - [Odyssey TRX - open-source SDR DDC/DUC transceiver](https://qrpblog.com/2016/02/odyssey-trx-open-source-sdr-ddcduc-transceiver/) - Odyssey TRX is an DDC/DUC SDR transceiver covering 0.1-55MHz with a transmit power of 10mW. It is open source and claims VERY impressive RX & TX performance. - [Icom IC-7300 review](https://qrpblog.com/2016/03/icom-ic-7300-review/) - Icom IC-7300 is the first direct sampling SDR transceiver available from one of the Big Three. It brings a new level of performance at an accessible price point - [3 years later](https://qrpblog.com/2016/03/3-years-later/) - I started this blog 3 years ago, a few months after I got my first amateur radio license and about the same time I got my @YO9IRF Twitter account. - [Yaesu FT-891 - new HF/50MHz transceiver ?](https://qrpblog.com/2016/04/yaesu-ft-891-new-hf50mhz-transceiver/) - HF/50MHz mobile radio similar with the FT-857 in size. - [Icom IC-7300 and spectrum / waterfall on the PC](https://qrpblog.com/2016/04/icom-ic-7300-and-spectrum-waterfall-on-pc/) - Icom IC-7300 spectrum / waterfall display on the PC with the Icom RS-BA1 software. Refresh rate and delay. - [Romania (YO) gets 60m access](https://qrpblog.com/2016/04/romania-yo-gets-60m-access/) - Following the conclusions of WRC 2015, the Romanian authority ANCOM is granting amateurs temporary access to a channel in the 5MHz band (60 meters). - [ESDR - new portable SDR HF transceiver](https://qrpblog.com/2016/04/esdr-new-portable-sdr-hf-transceiver/) - ESDR is a 30W portable SDR transceiver with HF coverage. It features a large color display, digimode decoder/keyer, 2x USB ports and micro-SD card. - [Icom IC-705 - considerations on RX power draw (wild guesses ahead)](https://qrpblog.com/2019/09/icom-ic-705-considerations-on-rx-power-draw-wild-guesses-ahead/) - [Icom IC-705 HF/VHF/UHF portable SDR transceiver - full details](https://qrpblog.com/2019/08/icom-ic-705-hf-vhf-uhf-portable-transceiver-announced/) - [Yaesu FT3D - new flagship VHF/UHF handheld](https://qrpblog.com/2019/05/yaesu-ft3d-new-flagship-vhf-uhf-handheld/) - Yaesu FT3D is the latest VHF/UHF FM/C4FM handheld; features a color touchscreen display, Bluetooth, GPS, APRS, Fusion, Wires-X, wide RX, SD card. FT3DR FT3DE - [Red Pitaya STEMlab 122.88-16 for SDR transceivers](https://qrpblog.com/2019/02/red-pitaya-stemlab-122-88-16-for-sdr-transceivers/) - Red Pitaya have just introduced the STEMlab 122.88-16, an updated version of the STEMlab hardware aimed specifically at beaing used as a DDC SDR transceiver. - [Yaesu FT-4X review (it is after all a Baofeng)](https://qrpblog.com/2018/09/yaesu-ft-4x-review-it-is-after-all-a-baofeng/) - Yaesu FT-4X is part of the new range of low-cost outdoor handhelds from Yaesu. Rugged casings, IP54 water protection and loud speakers are just some of the features. - [ADE-1-24 mixer](https://qrpblog.com/2018/06/ade-1-24-mixer/) - ADE-1-24 are double-balanced RF mixers that can be easily found all over eBay, Aliexpress and a few other websites. They are usually available for attractive prices and sometimes might be advertised simply as "ADE-1". - [Yaesu FT-818 details leaked (FT-817nd replacement)](https://qrpblog.com/2018/02/yaesu-ft-818-details-leaked-ft-817nd-replacement/) - After rumors about the Yaesu FT-818 have been circulating for about 6 years, we get to see the first details on the new portable QRP all-band all-mode transceiver from Yaesu. - [XTRX mini-PCIe SDR for embedded, now crowdfunding](https://qrpblog.com/2017/12/xtrx-mini-pcie-sdr-for-embedded-now-crowdfunding/) - XTRX is a mini-PCIe implementation of the Lime Microsystems LMS7002M RF IC aimed at the embedded environment, done by Fairwaves. Available through crowdfunding - [MRF1K50H - new 1500W LDMOS from NXP](https://qrpblog.com/2016/05/mrf1k50h-new-1500w-ldmos-from-nxp/) - MRF1K50H has an output power of 1500W, works at 50V and up to 500MHz, typical effciency is 74% in AB class and the gain is 23.5dB @ 230MHz. - [Yaesu FT-891 update](https://qrpblog.com/2016/05/yaesu-ft-891-update/) - Yaesu FT-891 is the smallest at lightest 100W HF transceiver ever built, at 155x52x218mm and 1.9Kg. The 2A RX current draw is a bit too high for portable. - [Yaesu FT-891 video](https://qrpblog.com/2016/06/yaesu-ft-891-video/) - Tried the Yaesu FT-891 at Friedrichshafen 2016 Ham Radio expo. The radio is pretty menu-driven, important menu options are hidden behind a few button presses. - [Red Pitaya Hamlab - HF/6m 10W SDR transceiver and much more](https://qrpblog.com/2016/06/red-pitaya-hamlab-hf6m-10w-sdr-transceiver-and-much-more/) - Red Pitaya Hamlab is a dual-receiver dual-transmitter DDC/DUC HF/6m 10W SDR transceiver with extended measurement capabilities, based on the Red Pitaya board. - [Yaesu FT-891 Operating Manual](https://qrpblog.com/2016/06/yaesu-ft-891-operating-manual/) - Click here to download the Yaesu FT-891 Operating Manual in PDF format. - [Baofeng UV-50X3 - new mobile radio](https://qrpblog.com/2016/07/baofeng-uv-50x3-new-mobile-radio/) - The Baofeng UV-50X3 covers 2m, 70cm and 1.25m and had wideband RX. It is full-duplex and can be programmed via the popular and free CHIRP software. - [Onion Omega2 - $5 WiFi Linux computer](https://qrpblog.com/2016/07/onion-omega2-5-wifi-linux-computer/) - The Onion Omega2 is a miniature Linux computer with integrated storage and WiFi. It runs on Linux so it supports languages such as C++, Python, PHP, nodeJS etc. - [RedPitaya expands line-up with 7 StemLab models](https://qrpblog.com/2016/10/redpitaya-expands-line-up-with-7-stemlab-models/) - The Red Pitaya powerful test instrument is now available as 2 different models (125-10 and 125-14) in 7 different bundles. - [A600 v2.0 amplifier module - changes and improvements](https://qrpblog.com/2019/12/a600-v2-0-amplifier-module-changes-and-improvements/) - I have recently made available a new version on the A600 amplifier based on MRF300 LDMOS transistors. Here is the list of improvements that come with v2.0. - [B1500 - Backpanel Unit for RF power Amplifiers](https://qrpblog.com/2020/03/b1500-backpanel-unit-for-rf-power-amplifiers/) - [Icom ID-52 VHF/UHF D-Star Handheld Announced](https://qrpblog.com/2020/08/icom-id-52-vhf-uhf-d-star-handheld-announced/) - [What's wrong with ham radio](https://qrpblog.com/2020/07/whats-wrong-with-ham-radio/) - Amateur Radio is an amazing hobby and has many sides to it, but it's far from perfect. A Twitter challenge by Ria N2RJ made me think about what can be improved. - [Icom IC-705 coming in April 2020, price announced](https://qrpblog.com/2019/12/icom-ic-705-coming-in-april-2020-price-announced/) - The new Icom IC-705 should be available starting April 2020, with a MSRP of 124,800 yen + tax. Similar price to the IC-7300. - [Amateur Radio Weekly - great newsletter](https://qrpblog.com/2018/02/amateur-radio-weekly-great-newsletter/) - I recently discovered the Amateur Radio Weekly - a newsletter put together by Cale (K4HCK), and I was impressed. The content is wonderfully curated, it looks amazing and the overall impression is very professional. - [Yaesu FT-818nd user manual](https://qrpblog.com/2018/03/yaesu-ft-818nd-user-manual/) - The Yaesu FT-818nd user manual has been published and it can be downloaded from here. - [US regulator FCC to introduce digital modes practical test for amateur examinations](https://qrpblog.com/2019/04/us-regulator-fcc-to-introduce-digital-modes-practical-test-for-amateur-exams/) - Officials are looking to replace the now discontinued practical CW proficiency test with a modern FT8 test for the next generation of hams. - [Icom IC-7300 schematic](https://qrpblog.com/2016/02/icom-ic-7300-schematic/) - Icom IC-7300's schematic just became available, and you can get it here. Just click to download the PDF file. - [Tmate2 - external CAT console](https://qrpblog.com/2013/02/tmate2-external-cat-console/) - [Kenwood TS-990S revealed](https://qrpblog.com/2013/02/kenwood-ts-990s-revealed/) - [SDR Basics explained](https://qrpblog.com/2013/02/sdr-basics-explained/) - [Over the Horizon radars and ham radio interference](https://qrpblog.com/2013/02/over-horizon-radars-and-ham-radio/) - [WSPR and antenna radiation pattern](https://qrpblog.com/2013/02/wspr-and-antenna-radiation-pattern/) - [Kenwood TS-990S instruction manual is public](https://qrpblog.com/2013/03/kenwood-ts-990s-instruction-manual-is-public/) - [V53ARC - multiband WSPR beacon in Namibia](https://qrpblog.com/2013/03/v53arc-multiband-wspr-beacon-in-namibia/) - [A bit of solar activity](https://qrpblog.com/2013/03/a-bit-of-solar-activity/) - [Kenwood TS-990s - inside pictures](https://qrpblog.com/2013/03/kenwood-ts-990s-inside-pictures/) - [The 630m band is official](https://qrpblog.com/2013/03/the-630m-band-is-official/) - [Raspberry Pi as a WSPR beacon](https://qrpblog.com/2013/03/raspberry-pi-as-wspr-beacon/) - Some guys at the Imperial College Robotics Society in UK found out that you can actually output a modulated clock signal on one of the GPIO pins to act as a small RF transmitter, and Dan MD1CLV and Guido PE1NNZ took the idea further and implemented the necessary coding in order to make it a working WSPR beacon. - [My first contest - CQ WPX SSB 2013](https://qrpblog.com/2013/04/my-first-contest-cq-wpx-ssb-2013/) - [Codan Envoy - SDR-based HF transceiver](https://qrpblog.com/2013/04/codan-envoy-sdr-based-hf-transceiver/) - [Codan Envoy - SDR-based HF transceiver](https://qrpblog.com/2013/04/codan-envoy-sdr-based-hf-transceiver/) - [Baojie BJ-UV55 - new chinese mobile VHF/UHF radio](https://qrpblog.com/2013/09/baojie-bj-uv55-new-chinese-mobile-vhfuhf-radio/) - [LDG RT-100 - new 100W remote tuner](https://qrpblog.com/2013/10/ldg-rt-100-new-100w-remote-tuner/) - [Ghe-O Rescue - offroad monster for emergency situations](https://qrpblog.com/2013/10/ghe-o-rescue-offroad-monster-for-emergency-situations/) - [Intel Galileo - Arduino with a Pentium](https://qrpblog.com/2013/10/intel-galileo-arduino-with-pentium/) - [The Red Tent - must-see movie for radio amateurs](https://qrpblog.com/2013/10/the-red-tent-must-see-movie-for-radio-amateurs/) - [UT-100 - SDR USB dongle transceiver](https://qrpblog.com/2013/10/ut-100-sdr-usb-dongle-transceiver/) - [Steve Jobs influenced by ham radio](https://qrpblog.com/2013/11/steve-jobs-influenced-by-ham-radio/) - [YO9IRF station updates](https://qrpblog.com/2014/01/yo9irf-station-updates/) - [Triband Delta Loop antenna - some theory](https://qrpblog.com/2014/02/triband-delta-loop-antenna-some-theory/) - [Nice day for portable activity](https://qrpblog.com/2014/04/nice-day-for-portable-activity/) - [A good day for SOTA - YO/EC-057 activated](https://qrpblog.com/2014/04/a-good-day-for-sota-yoec-057-activated/) - [Elad FDM-DUO standalone SDR HF+6m transceiver](https://qrpblog.com/2014/04/elad-fdm-duo-standalone-sdr-hf6m-transceiver/) - [SOTA activation YO/MM-001](https://qrpblog.com/2014/05/sota-activation-yomm-001/) - [FLEX-6300 - a more affordable 6000 series model from FlexRadio](https://qrpblog.com/2014/05/flex-6300-more-affordable-6000-series/) - [Elecraft KX3 2m option is available](https://qrpblog.com/2014/06/elecraft-kx3-2m-option-is-available/) - [Yaesu FT-897D is discontinued](https://qrpblog.com/2014/06/yaesu-ft-897d-is-discontinued/) - [Optibeam OB21-3 - largest 20-15-10m antenna](https://qrpblog.com/2014/06/optibeam-ob21-3-largest-20-15-10m-antenna/) - [SOTA activation YO/MC-014](https://qrpblog.com/2014/08/sota-activation-yomc-014/) - [SOTA activity again, near Predeal](https://qrpblog.com/2014/09/sota-activity-again-near-predeal/) - SOTA activation of YO/EC-252 Piatra Arsa and YO/EC-241 Fitifoiul. - [Noble NR4SC - monoband QRP TRX for 70MHz band](https://qrpblog.com/2014/10/noble-nr4sc-monoband-qrp-trx-for-70mhz-band/) - Noble NR4SC is a new transceiver for the 70MHz band, supporting SSB and CW, with 10W output. It's a simple design with good usability, easy to learn and to use. - [An amateur radio beacon will fly to the moon and back](https://qrpblog.com/2014/10/an-amateur-radio-beacon-will-fly-to-the-moon-and-back/) - The 4M Moon Mission will include a JT65 beacon that will transmit shortly after departure on the 2m amateur radio band. - [CQWW SSB 2014 fail](https://qrpblog.com/2014/10/cqww-ssb-2014-fail/) - I wanted to take part in CQWW SSB 2014 in the 10m SOSB QRP category as the propagation was looking good. Unfortunately, the weather defeated me in a big way. - [VHF/UHF transceiver module for US$12 - Dorji DRA818](https://qrpblog.com/2014/11/vhfuhf-transceiver-module-for-us12-dorji-dra818/) - Dorji 808/818 are a series of FM transceiver modules based on RDA Micro's RDA1845/6 chipsets - the same ones in the Baofeng / Pofung handhelds. - [About the Rosetta comet landing mission](https://qrpblog.com/2014/11/about-rosetta-comt-landing-mission/) - The Rosetta mission to study Comet 67P/Churyumov-Gerasimenko is getting ready to land the Philae probe on the comet surface, and it will be webcasted live. - [Icom's new flagship: IC-7851](https://qrpblog.com/2014/12/icoms-new-flagship-ic-7851/) - Icom claims redesigned insides for the IC-7851, aimed at improving performance "no matter what cost". - [Baofeng DMR6X2 - dual band DMR handheld, 7W output](https://qrpblog.com/2017/11/baofeng-dmr6x2-dual-band-dmr-handheld-7w-output/) - Baofeng DMR6X2 is a dual band (2m/70cm) DMR Tier I & II handheld with 7W output and FCC certification. - [Raspberry Pi 2 freezes when photographed](https://qrpblog.com/2015/02/raspberry-pi-2-freezes-when-photographed/) - There is a funny issue with the Raspberry Foundation's new creation: when exposed to strong infrared light it just freezes and crashes. - [HF-P1 portable antenna review](https://qrpblog.com/2015/01/hf-p1-portable-antenna-review/) - The HF-P1 is a lightweight antenna with HF to UHF coverage, designed for portable operations where size and weight are important. Read further to find out more. - [Testing the Ultimate 3 WSPR beacon](https://qrpblog.com/2015/01/testing-ultimate-3-wspr-beacon/) - I just strapped the new filters I made (not only for 6m, but also for 10m and 15m) into the sockets of the Ultimate3 and found a nice metal casing for it. - [Yaesu FT-757GX - fixing some common faults](https://qrpblog.com/2017/11/yaesu-ft-757gx-fixing-some-common-faults/) - FT-757GX with no audio on SSB/AM/FM, no power on some bands, damaged diodes on front end of RF Unit. - [CQWPX 2014 - official results came in](https://qrpblog.com/2014/09/cqwpx-2014-official-results-came-in/) - As I was expecting after the claimed scores, I ranked #5 in 21Mhz single-op QRP category. - [SOTA Spotter Android app](https://qrpblog.com/2015/03/sota-spotter-android-app/) - An app that sends spots to the SOTA cluster, runs on Android and takes very few resources. SOTA Spotter was released back in Oct 2014 by SOTA afficionado Bogdan Lazanu YO8SAW. - [SOTA activation: YO/EC-480 and YO/EC-312](https://qrpblog.com/2015/03/sota-activation-yoec-480-and-yoec-312/) - YO/EC-480 Dealul Frumos and YO/EC-312 Secaria were two summits I've been planning to activate for some time now and I was lucky to find Florin YO9IPF that agreed to come with me. - [Friedrichshafen Ham Radio 2015 (I) - the road, the city and the campsite](https://qrpblog.com/2015/07/friedrichshafen-ham-radio-2015-i-road/) - Friedrichshafen Ham Radio is the largest amateur radio convention in Europe and the second-largest in the world, marginally surpassed by the Dayton Hamfest. - [Yaesu's new HF radio, FT-410](https://qrpblog.com/2015/08/yaesus-new-hf-radio-ft-410/) - Yaesu FT-410 seems to be the latest HF radio to surface from Japan, and from the looks of it it's the successor of FT-600 to fight the Icom IC-718 and Alinco SRT-8/9 series. - [Sci-fi series Colony starring Baofeng UV-5R](https://qrpblog.com/2016/02/sci-fi-series-colony-starring-baofeng-uv-5r/) - All the forces in Colony's occupied LA - military, detectives, the resistance move - use the Baofeng UV-5R. These are all images from one episode : - [Myriad RF - an Arduino transciever shield](https://qrpblog.com/2013/03/myriad-rf-arduino-transciever-shield/) - [SunSDR-MB1 - finally a proper modern transceiver](https://qrpblog.com/2014/06/sunsdr-mb1-finally-proper-modern/) - [DXpedition videos - VP6T, 3D2C, BS7H, 5A7A, AH1A](https://qrpblog.com/2013/02/dxpedition-videos-vp6t-3d2c-bs7h-5a7a-ah1a/) ## Pages - [HF/6m LDMOS linear amplifier kits](https://qrpblog.com/a600-hf-6m-600w-ldmos-amplifier/) - A600 linear HF VHF LDMOS amplifier project using 2x MRF300. Linear amplifier kits and filters available in the shop. - [Privacy Policy](https://qrpblog.com/privacy-policy/) - [About QRPblog](https://qrpblog.com/about-me/) - Amateur radio blog of Razvan M0HZH / YO9IRF. - [YO SOTA Marathon](https://qrpblog.com/yo-sota-marathon/) - YO SOTA Marathon is a mountain hiking and amateur radio event that takes place yearly in the mountains of Romania, related to the Summits On the Air award scheme - [VHF/UHF handheld performance comparison](https://qrpblog.com/vhf-uhf-handheld-performance-comparison/) - This table shows test result data for VHF/UHF handheld transceivers, comparing performance in sensitivity, dynamic range and adjacent channel rejection. - [Shop](https://qrpblog.com/shop/) - LDMOS amplifier kits you can build yourself. - [Cookie Policy](https://qrpblog.com/cookie-policy/) ## Downloads - [A600 v3.0 Amplifier Kit full assembly instructions](https://qrpblog.com/download/a600-v3-0-amplifier-kit-full-assembly-instructions/) - [Spiderbeam, Moxon & Yagi 10m antennas - EZNEC files](https://qrpblog.com/download/spiderbean-moxon-yagi-10m-antennas-eznec-files/) - [F1500 v1.1 LPF Kit full assembly instructions](https://qrpblog.com/download/f1500-v1-1-lpf-kit-full-assembly-instructions/) - [A600 v2.3 Amplifier Kit full assembly instructions](https://qrpblog.com/download/a600-v2-3-amplifier-kit-full-assembly-instructions/) - [F1500 v1.0 LPF Kit full assembly instructions](https://qrpblog.com/download/f1500-v1-0-lpf-kit-full-assembly-instructions/) - [B1500 v1.0 Backpanel Unit Kit full assembly instructions](https://qrpblog.com/download/b1500-v1-0-backpanel-unit-kit-full-assembly-instructions/) - [F600 v1.0 LPF Kit full assembly instructions](https://qrpblog.com/download/f600-v1-0-lpf-kit-full-assembly-instructions/) - [ULQ2003 fix for B1500 v1.0 and F600 v1.0 units](https://qrpblog.com/download/ulq2003-fix-for-b1500-v1-0-and-f600-v1-0-units/) - [A600 v2.1 Amplifier Kit full assembly instructions](https://qrpblog.com/download/a600-v2-1-amplifier-kit-full-assembly-instructions/) - [A600 v2.0 Amplifier Kit full assembly instructions](https://qrpblog.com/download/a600-v2-0-amplifier-kit-full-assembly-instructions/) - [A600 v1.2 Amplifier Kit full assembly instructions](https://qrpblog.com/download/a600-v1-2-amplifier-kit-full-assembly-instructions/) - [Xiegu X108G Schematic](https://qrpblog.com/download/xiegu-x108g-schematic/) - [Icom IC-7300 User Manual](https://qrpblog.com/download/icom-ic-7300-user-manual/) - [Icom IC-7300 Service Manual](https://qrpblog.com/download/icom-ic-7300-service-manual/) - [Icom IC-7300 Schematic Diagram](https://qrpblog.com/download/icom-ic-7300-schematic-diagram/) - [Yaesu FT3DR/E Catalog](https://qrpblog.com/download/yaesu-ft3dr-e-catalog/) - [Icom IC-718 Service Manual Addendum](https://qrpblog.com/download/icom-ic-718-service-manual-addendum/) - [Yaesu FT-8100 Service Manual](https://qrpblog.com/download/yaesu-ft-8100-service-manual/) - This is the Yaesu FT-8100 Service Manual. Includes schematic diagram. - [Kenwood TH-F6A TH-F7E User Manual](https://qrpblog.com/download/kenwood-th-f6-th-f7-user-manual/) - This is the Kenwood TH-F6A TH-F7E User Operating Instruction Manual. - [Yaesu FT-747GX Service Manual](https://qrpblog.com/download/yaesu-ft-747gx-service-manual/) - This is the Yaesu FT-747GX Service Manual. - [Kenwood TH-F6A TH-F7E Service Manual](https://qrpblog.com/download/kenwood-th-f6-th-f7-service-manual/) - This is the Kenwood TH-F6A TH-F7E Service Manual. - [Yaesu FT-8100 User Manual](https://qrpblog.com/download/yaesu-ft-8100-user-manual/) - This is the Yaesu FT-8100 User Operating Instruction Manual. - [Yaesu FT-4X Advanced User Manual](https://qrpblog.com/download/yaesu-ft-4x-advanced-user-manual/) - This is the Advance User Manual for the Yaesu FT-4XR / FT-4XE. - [Yaesu FT-757GX Service Manual](https://qrpblog.com/download/yaesu-ft-757gx-service-manual/) - This is the Yaesu FT-757GX Service Manual. It includes schematic diagrams, service and alignment, signal levels and voltage charts, CAT system interface. - [Yaesu FT-818nd User Manual](https://qrpblog.com/download/yaesu-ft-818nd-user-manual/) - This is the Yaesu FT-818nd User Operating Manual. It includes Installation, Operation, Memory, Spectrum Scope, Scanning, Menu Operation and Optional Accessories. - [Kenwood TS-50S User Manual](https://qrpblog.com/download/kenwood-ts-50s-user-manual/) - This is the Operator Manual for the Kenwood TS-50S. - [Kenwood TS-50S Service Manual](https://qrpblog.com/download/kenwood-ts-50s-service-manual/) - Service Manual for the Kenwood TS-50S. It includes Schematic diagram, Circuit description, Parts list, Adjustment, Block diagram, MC-47 microphone wiring. - [Alinco DX-70 (TH/EH) Service Manual](https://qrpblog.com/download/alinco-dx-70-th-eh-service-manual/) - [Yaesu FT-65 Advanced User Manual](https://qrpblog.com/download/yaesu-ft-65-advanced-user-manual/) - [Yaesu FT4X User Manual](https://qrpblog.com/download/yaesu-ft4x-user-manual/) - [Kenwood TS-440S/SAT User Manual](https://qrpblog.com/download/kenwood-ts-440s-sat-user-manual/) - [Kenwood TS-440S/SAT Service Manual](https://qrpblog.com/download/kenwood-ts-440s-sat-service-manual/) - [Alinco DX70 (TH/EH) User Manual](https://qrpblog.com/download/alinco-dx70-th-eh-user-manual/) - [Yaesu FT-747GX User Manual](https://qrpblog.com/download/yaesu-ft-747gx-user-manual/) ## Products - [A600 HF/VHF 600W Linear Amplifier Kit](https://qrpblog.com/product/a600-hf-vhf-600w-linear-amplifier-kit/) - Linear HF VHF Amplifier kit with 2x MRF300 LDMOS RF power transistors. 600W, 1.8 to 72MHz, 6x onboard sensors. NXP Homebrew RF Design Challenge award winner. - [F600 160m-4m 600W Low Pass Filter kit](https://qrpblog.com/product/f600-160m-4m-600w-low-pass-filter-kit/) - [F1500 160m-4m 1500W Low Pass Filter kit](https://qrpblog.com/product/f1500-160m-4m-1500w-low-pass-filter-kit/) - HF/VHF amplifier LPF Unit that includes 7 low pass filters rated at 1500W PEP, for 160m to 4m amateur radio bands. Low insertion loss, excellent harmonic rejection. - [B1500 RF Amplifier Backpanel Unit kit](https://qrpblog.com/product/b1500-rf-amplifier-backpanel-unit/) - The Backpanel Unit handles RF amplifier RX/TX switching, antenna selection and transceiver interfacing. It also has a DC-DC converter that supplies 12V at 3A. - [A600 HF/VHF 600W linear amplifier kit v2.0](https://qrpblog.com/product/a600-hf-vhf-600w-linear-amplifier-kit-v2-0/) - [A600 HF/VHF 600W linear amplifier kit v1.2](https://qrpblog.com/product/a600-hf-vhf-linear-amplifier-kit-v12/) ## Categories - [News](https://qrpblog.com/category/news/) - [Reviews](https://qrpblog.com/category/reviews/) - [In the shack](https://qrpblog.com/category/in-the-shack/) - [SOTA](https://qrpblog.com/category/sota/) ## Tags - [DDS](https://qrpblog.com/tag/dds/) - [Arduino](https://qrpblog.com/tag/arduino/) - [SDR](https://qrpblog.com/tag/sdr/) - [Red Pitaya](https://qrpblog.com/tag/red-pitaya/) - [computer](https://qrpblog.com/tag/computer/) - [miniature](https://qrpblog.com/tag/miniature/) - [Omega2](https://qrpblog.com/tag/omega2/) - [Raspberry Pi](https://qrpblog.com/tag/raspberry-pi/) - [Onion](https://qrpblog.com/tag/onion/) - [Baofeng](https://qrpblog.com/tag/baofeng/) - [mobile](https://qrpblog.com/tag/mobile/) - [transceiver](https://qrpblog.com/tag/transceiver/) - [fm](https://qrpblog.com/tag/fm/) - [UV-50X3](https://qrpblog.com/tag/uv-50x3/) - [Kenwood](https://qrpblog.com/tag/kenwood/) - [Yaesu](https://qrpblog.com/tag/yaesu/) - [manual](https://qrpblog.com/tag/manual/) - [FT-891](https://qrpblog.com/tag/ft-891/) - [DDC](https://qrpblog.com/tag/ddc/) - [Friedrichshafen](https://qrpblog.com/tag/friedrichshafen/) - [DUC](https://qrpblog.com/tag/duc/) - [Hamlab](https://qrpblog.com/tag/hamlab/) - [PowerSDR](https://qrpblog.com/tag/powersdr/) - [FT-817](https://qrpblog.com/tag/ft-817/) - [FT-991](https://qrpblog.com/tag/ft-991/) - [FT-791](https://qrpblog.com/tag/ft-791/) - [FC-50](https://qrpblog.com/tag/fc-50/) - [FT-857](https://qrpblog.com/tag/ft-857/) - [QRO](https://qrpblog.com/tag/qro/) - [amplifier](https://qrpblog.com/tag/amplifier/) - [LDMOS](https://qrpblog.com/tag/ldmos/) - [transistor](https://qrpblog.com/tag/transistor/) - [Elecraft](https://qrpblog.com/tag/elecraft/) - [digimodes](https://qrpblog.com/tag/digimodes/) - 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[X1M](https://qrpblog.com/tag/x1m/) - [RTL2832](https://qrpblog.com/tag/rtl2832/) - [USB dongle](https://qrpblog.com/tag/usb-dongle/) - [TV](https://qrpblog.com/tag/tv/) - [UT-100](https://qrpblog.com/tag/ut-100/) - [Intel Galileo](https://qrpblog.com/tag/intel-galileo/) - [Ghe-O Motors](https://qrpblog.com/tag/ghe-o-motors/) - [automotive](https://qrpblog.com/tag/automotive/) - [Ghe-O Rescue](https://qrpblog.com/tag/ghe-o-rescue/) - [tuner](https://qrpblog.com/tag/tuner/) - [short wave](https://qrpblog.com/tag/short-wave/) - [Baojie](https://qrpblog.com/tag/baojie/) - [Codan](https://qrpblog.com/tag/codan/) - [BITX](https://qrpblog.com/tag/bitx/) - [AD9850](https://qrpblog.com/tag/ad9850/) - [Myriad RF](https://qrpblog.com/tag/myriad-rf/) - [630m band](https://qrpblog.com/tag/630m-band/) - [frequency allocation](https://qrpblog.com/tag/frequency-allocation/) - [dxpedition](https://qrpblog.com/tag/dxpedition/) - [solar](https://qrpblog.com/tag/solar/) - [propagation](https://qrpblog.com/tag/propagation/) - [dx](https://qrpblog.com/tag/dx/) - [radar](https://qrpblog.com/tag/radar/) - [OTH](https://qrpblog.com/tag/oth/) - [woodpecker](https://qrpblog.com/tag/woodpecker/) - [over the horizon](https://qrpblog.com/tag/over-the-horizon/) - [Woodboxradio](https://qrpblog.com/tag/woodboxradio/) - [HF](https://qrpblog.com/tag/hf/) - [repair](https://qrpblog.com/tag/repair/) - [FT-757GX](https://qrpblog.com/tag/ft-757gx/) - [DMR](https://qrpblog.com/tag/dmr/) - [LMS7002](https://qrpblog.com/tag/lms7002/) - [Crowdfunding](https://qrpblog.com/tag/crowdfunding/) - [FT-818](https://qrpblog.com/tag/ft-818/) - [newsletter](https://qrpblog.com/tag/newsletter/) - [rf](https://qrpblog.com/tag/rf/) - [ADE-1-24](https://qrpblog.com/tag/ade-1-24/) - [Mini Circuits](https://qrpblog.com/tag/mini-circuits/) - [VNA](https://qrpblog.com/tag/vna/) - [user manual](https://qrpblog.com/tag/user-manual/) - [FT-8100](https://qrpblog.com/tag/ft-8100/) - [service manual](https://qrpblog.com/tag/service-manual/) - [FT-747GX](https://qrpblog.com/tag/ft-747gx/) - 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[Schematic](https://qrpblog.com/tag/schematic/) - [NXP](https://qrpblog.com/tag/nxp/) - [PCBway](https://qrpblog.com/tag/pcbway/) - [a600](https://qrpblog.com/tag/a600/) - [cooling](https://qrpblog.com/tag/cooling/) - [thermal](https://qrpblog.com/tag/thermal/) - [low pass filter](https://qrpblog.com/tag/low-pass-filter/) - [amidon](https://qrpblog.com/tag/amidon/) - [kit](https://qrpblog.com/tag/kit/) - [id-51](https://qrpblog.com/tag/id-51/) - [id-52](https://qrpblog.com/tag/id-52/) - [d-star](https://qrpblog.com/tag/d-star/) - [IC-905](https://qrpblog.com/tag/ic-905/) - [SHF](https://qrpblog.com/tag/shf/) - [SHF-P1](https://qrpblog.com/tag/shf-p1/) - [linear](https://qrpblog.com/tag/linear/) - [ampleon](https://qrpblog.com/tag/ampleon/) ## Categories - [User Manuals](https://qrpblog.com/download-category/user-manuals/) - [Service Manuals](https://qrpblog.com/download-category/service-manuals/) ## Product categories - [Uncategorised](https://qrpblog.com/product-category/uncategorised/) - [Complete kits](https://qrpblog.com/product-category/complete-kits/)