Generated by All in One SEO v5.0.1.1, this is an llms.txt file, used by LLMs to index the site. # N1UGK’s Amateur Radio Blog Observations, Experiments, Discussions about Amateur Radio ## Sitemaps - [XML Sitemap](https://n1ugk.com/sitemap.xml): Contains all public & indexable URLs for this website. ## Posts - [Repairing a Vintage Realistic Transistor Radio](https://n1ugk.com/2026/06/repairing-a-vintage-realistic-transistor-radio/) - I found the very same transistor radio I had when I was around 5 years old, an eBay purchase which I was able to repair. - [Texas Instruments TI-92 Plus Graphing Calculator](https://n1ugk.com/2026/01/texas-instruments-ti-92-plus-graphing-calculator/) - I explore the TI-92 Plus (and similar) TI graphing calculators after a few simple repairs as well as introduce the PCUI (Pocket Computer Universal Interface) support for these calculators. - [Pocket Computer Universal Interface](https://n1ugk.com/2025/12/pocket-computer-universal-interface/) - I began development of a Universal Pocket Computer Interface for use with Sharp, Casio, and Texas Instruments pocket computers and graphing calculators. - [SSTV from ISS - World Space Week 2025](https://n1ugk.com/2025/10/sstv-from-iss-world-space-week-2025/) - ARISS commemorated the 68th anniversary of the launch of the world’s first satellite - Sputnik-1 - by transmitting a series of space cooperation-themed SSTV images from the International Space Station (ISS) from October 3 until October 9th. - [Using a Landline Phone in 2025](https://n1ugk.com/2025/09/using-a-landline-phone-in-2025/) - I used the Xtreme Technologies XLink BT landline bridge to make and receive phone calls on a Western Electric Model 500 rotary phone and an old cordless phone from the 1980s. No landline service needed, just an Apple or Android phone with Bluetooth. - [Casio FX-702P Programmable Calculator](https://n1ugk.com/2025/07/casio-fx-702p-programmable-calculator/) - The Casio FX-702P was Casio's first BASIC programmable pocket computer. The associated printer, the FP-10 mini electrostatic printer is quite an experience. - [AM Stereo with the Sony SRF-A1](https://n1ugk.com/2025/07/am-stereo-with-the-sony-srf-a1/) - There was in fact AM Stereo broadcast in the U.S. and elsewhere in the world, back when AM radio was more popular. The Sony SRF-A1 Walkman was one of several AM stereo receivers. - [Casio FX-750P Personal Computer](https://n1ugk.com/2025/06/casio-fx-750p-personal-computer/) - The Casio FX-750P is one of several pocket computers which utilized removable RAM Cards for quickly swapping programs and/or data. - [Uniden SDS100 - Scanner Radios in 2025](https://n1ugk.com/2025/06/uniden-sds100-scanner-radios-in-2025/) - After a long break from using scanners, I stumbled across the Uniden SDS100. Quite a bit has changed since my last scanner from the 90s. - [Casio FX-880P Personal Computer](https://n1ugk.com/2025/05/casio-fx-880p-personal-computer/) - The Casio FX-880P paired with the FA-6 expansion is quite capable for various purposes. As an experiment, I ported the banner and maze programs and tried the globe program as well. - [Casio PB-2000C Personal Computer](https://n1ugk.com/2025/04/casio-pb-2000c-personal-computer/) - The PB-2000C was the first pocket computer I have used which supports programming in C. There are both benefits and drawbacks to this model compared to the Casio PB-1000. - [Back to Compact Discs](https://n1ugk.com/2025/03/back-to-compact-discs/) - This post describes my experiences with various audio formats starting from vinyl all the way to today’s streaming formats and why I came back to the compact disc as the best of them all. - [Bookshelf Speakers Lesson Learned](https://n1ugk.com/2025/01/bookshelf-speakers-lesson-learned/) - Ported speakers require specific room placement, and rear ported speakers limit placement options. I never before noticed port locations nor was I aware of the difference between front and rear ported speakers. - [SSTV from ISS](https://n1ugk.com/2025/01/sstv-from-iss/) - With minimal equipment needed, you can receive and decode SSTV from the ISS. The ISS broadcast SSTV on 2-meters from December 25, 2024 through January 5, 2025. - [Optimus STA-300](https://n1ugk.com/2024/12/optimus-sta-300/) - The Optimus STA-300 is a surprisingly great sounding amplifier. I had one of these new back in the mid 90s and recently picked one up from an auction site. - [USB Charging for any HT](https://n1ugk.com/2024/12/usb-charging-for-any-ht/) - I tried using a USB-C to 12 volt cable to charge my FT5D HT and it did not work as expected. However, I found an equally convenient method to charge this HT. - [Kantronics KAM All Mode TNC for HF Packet Radio](https://n1ugk.com/2023/08/kantronics-kam-all-mode-tnc-for-hf-packet-radio/) - I recently tried HF packet using a vintage Kantronics KAM All Mode TNC and the FT-991A. I used an RJ45 A/B switch to be able to switch between either port of the KAM or between the KAM and my KPC-3. - [Using HF Packet from an M5Stack Cardputer](https://n1ugk.com/2024/12/using-hf-packet-from-an-m5stack-cardputer/) - The M5Stack Cardputer is an inexpensive, functional, and highly portable computer. I was able to use it to connect to my HF TNC via SSH. - [Pioneer SX-626 Restoration](https://n1ugk.com/2024/12/pioneer-sx-626-restoration/) - The Pioneer SX-626 was an early 70s HiFi receiver which had that classic wood case and silver faceplate. This was my first receiver which I had when I was a kid, and I recently restored one. - [QRP Labs Ultimate3S WSPR Beacon Kit](https://n1ugk.com/2022/12/qrp-labs-ultimate3s-wspr-kit/) - My experience with the QRP Labs Ultimate3S Kit for setting up a WSPR beacon. - [AirPort Express (2nd Gen) for Airplay Streaming](https://n1ugk.com/2024/12/airport-express-2nd-gen-for-airplay-streaming/) - Adding AirPlay 2 support to existing amplifiers and receivers is simple and cost effective. Simply add an AirPort Express (2nd Gen) to an audio input and instantly stream to your older equipment. - [Casio PB-770 Personal Computer](https://n1ugk.com/2024/11/casio-pb-770/) - The Casio PB-770 was quite an impressive model given the release date. With a multi-line display and memory expansion options, this model was certainly a competitor to the Sharp offerings of the time. - [(tr)uSDX Rev 1.2 Mainboard](https://n1ugk.com/2024/11/trusdx-rev-1-2-mainboard/) - I updated one of my (tr)uSDX transceivers to the mainboard revision 1.2 to see if it fixed the “howling” issue. - [Refilling Vintage Plotter Pens](https://n1ugk.com/2024/11/refilling-vintage-plotter-pens/) - I have had some success refilling vintage plotter pens for the Casio, Sharp, and Radio Shack printer plotters. After quite a few trials and errors, I might have finally solved the refill challenge. - [Maze Program for the Casio PB-1000](https://n1ugk.com/2024/11/maze-program-for-the-casio-pb-1000/) - I adapted the PB-770 maze program for the PB-1000 and created three types of printouts for the randomly generated mazes. - [Casio PB-1000 Personal Computer](https://n1ugk.com/2024/11/casio-pb-1000-personal-computer/) - I found a Casio PB-1000 and an MD-100 on an auction site. I have spent a few months with this pocket computer and it has become one of my favourites. - [Kenwood TS-830S CW Filter Installation](https://n1ugk.com/2023/01/ts-830s-cw-filter-installation/) - I decided to install the optional CW filters in my Kenwood TS-830S. - [6 Meters - The “Magic Band“](https://n1ugk.com/2024/06/6-meters-the-magic-band/) - As we are approaching the height of the current solar cycle 25, 6-meters has had quite a few openings recently. - [Meshtastic for Off-Grid Texting](https://n1ugk.com/2024/09/meshtastic-for-off-grid-texting/) - After hearing quite a bit about Meshtastic, I picked up a few different inexpensive devices to experiment with and see how well they work for off-grid texting. - [Adding Active Cooling to Older Transceivers](https://n1ugk.com/2024/05/adding-active-cooling-to-older-transceivers/) - Adding a fan to keep an older mobile transceiver cool is easy to do with ready made parts. - [Kenwood TS-530SP](https://n1ugk.com/2022/12/kenwood-ts-530sp/) - The Kenwood TS-530SP is among some of the most popular hybrid rigs from the 80s which are still in service today. I purchased mine from N1QQV who got me into the hobby and who is now a silent key. The radio has sentimental value and operating it is like stepping back in time. - [Repairing a 3.5" Floppy Drive](https://n1ugk.com/2024/07/repairing-a-3-5-floppy-drive/) - I recently needed to read old 3.5" floppy disks for a project and was able to quite easily repair an old 3.5" floppy drive in an old laptop. - [RS-232 Interface for the PC-2](https://n1ugk.com/2024/07/rs-232-interface-for-the-pc-2/) - The RS-232 interface for the Radio Shack PC-2 along with the CE-158 for the Sharp PC-1500 are difficult to find these days. These added possibilities to connect to printers, modems, save load programs faster and more. Luckily the CE-158X has been released. - [Matching Game for the Tandy PC-6](https://n1ugk.com/2024/06/matching-game-for-the-tandy-pc-6/) - I was curious how difficult it would be to program a simple game for the PC-6. I picked a rather simple concept to start with, a "matching" game. - [Power Distribution with Battery Backup](https://n1ugk.com/2023/03/power-distribution-with-battery-backup/) - Using two battery switches, I added a simple way to switch between battery power and AC power. - [1.25-Meter RFI Takes Down My Internet](https://n1ugk.com/2024/05/1-25-cm-rfi-takes-down-my-internet/) - I had an unexpected source of RFI which took out my internet from Verizon FiOS. The fix was simple, but the process to find it was a bit tricky. - [Farewell MFJ](https://n1ugk.com/2024/04/farewell-mfj/) - MFJ have announced they will be shutting down their operations in May 2024. - [Neumayer Station III via WSPR](https://n1ugk.com/2024/04/neumayer-station-iii-via-wspr/) - WSPR is an interesting mode and offers some unexpected spotter locations. With as little as 200 milliwatts of power, you can reach half way across the globe. - [Tandy PC-7 Pocket Computer](https://n1ugk.com/2024/04/tandy-pc-7-pocket-computer/) - Although this is my least favourite of the Radio Shack line of pocket computers, it is the most nostalgic for me, as it is the only one I actually owned back when these were sold. - [Yaesu FTM-500DR](https://n1ugk.com/2023/05/yaesu-ftm-500dr/) - The FTM-500DR is the first mobile rig with a built in speaker in the remote head and with a microphone jack in the head and body. This makes for an easy installation. - [Assembling the “High Bands” (tr)uSDX Kit](https://n1ugk.com/2023/03/assembling-the-high-bands-trusdx-kit/) - After assembling the low bands version of the (tr)uSDX, I decided to try the high bands version of the kit, which includes 10, 12, 15, 17, and 20 meters. I mainly wanted the 10 meter band as we’re on the upswing of the current solar cycle. - [Is it really "Off Grid"?](https://n1ugk.com/2024/03/is-it-really-off-grid/) - There may be some dependencies on the grid needed to use your favourite radio communication mode(s). - [Using C4FM and Pi-Star for DMR Talkgroups](https://n1ugk.com/2023/11/using-c4fm-and-pi-star-for-dmr-talkgroups/) - You do not need a DMR radio to get into a DMR network such as BrandMeister or TGIF. You can use C4FM, D-STAR, and others with some simple configuration on Pi-Star. - [Packet Radio](https://n1ugk.com/2022/10/packet-radio/) - Packet radio is still a popular mode for APRS and Winlink, to name a few uses. With many forms of packet including hardware and software options, it’s worth exploring. - [Raising My First Outdoor HF Antenna](https://n1ugk.com/2023/12/raising-my-first-outdoor-hf-antenna/) - I have never had an outdoor HF antenna until now, and what a difference with the same antenna outdoors versus indoors. I managed to hang an OCFD antenna for 40, 20, 10 and 6 meters in a very small crowded lot. - [Loading Programs from WAV Files](https://n1ugk.com/2023/11/loading-programs-from-wav-files/) - With a bit of organization, you can avoid the frustrations of loading saved programs (wav files) into pocket computers or other vintage computers. - [Upgrading the Kenwood SP-230 Speaker](https://n1ugk.com/2023/10/upgrading-the-kenwood-sp-230-speaker/) - I upgraded the Kenwood SP-230 speaker using the Phits K95A and Phits GPH-X80 kits. The new speaker and foam made quite an improvement in detail and sound quality over the original speaker. - [Tandy PC-4 Pocket Computer](https://n1ugk.com/2023/10/pc-4-pocket-computer/) - I recently acquired the PC-4 printer and cassette modules and wrote a version of my banner program for this model pocket computer. With only 544 bytes available, it was the most challenging version to code. - [TRS-80 PC-1 Pocket Computer](https://n1ugk.com/2023/10/trs-80-pocket-computer-pc-1/) - Recently I’ve been curious about the TRS-80 Pocket Computer (the PC-1), the first pocket computer Radio Shack sold. I was able to find one on eBay and replace the LCD. - [Kenwood MC-50 Desk Microphone](https://n1ugk.com/2023/10/kenwood-mc-50-desk-microphone/) - I found a deal on a Kenwood MC-50 Desk Mic for my TS-530SP or TS-830S. All that was needed was a new 4-pin connector and the mic worked perfectly. - [Tandy PC-6 Pocket Computer](https://n1ugk.com/2023/10/tandy-pc-6-pocket-computer/) - The PC-6 was the best (in my opinion) rebadged Casio pocket computer Radio Shack sold. I built a cable to connect the PC-6 to the FP-12S printer and updated my banner program using only 909 bytes of memory. - [Standardize on Powerpole Connectors](https://n1ugk.com/2022/08/standardize-on-powerpole-connectors/) - Powerpole connectors make for a convenient and simple way to interconnect all of your equipment to your power sources. - [WSJT-X with SDRuno for WSPR Band Hopping](https://n1ugk.com/2022/11/sdr-wspr-receiver/) - Using CAT and VB-CABLE, put your SDR to work on HF with WSPR - [TRS-80 Model 100 with the KPC-3](https://n1ugk.com/2023/09/trs-80-model-100-with-the-kpc-3/) - I was able to solve an issue connecting a TRS-80 Model 100 to a Kantronics KPC-3 TNC. - [Assembling the (tr)uSDX Kit](https://n1ugk.com/2022/12/assembling-the-trusdx-kit/) - The (tr)uSDX is a pocket sized QRP transceiver, capable of CW, LSB, USB (and AM/FM). It covers 80, 60, 40, 30, and 20 meters. What I find amazing about this transceiver is that it has a VFO, OLED screen, built in speaker and key, all inside of a pocket sized case. Further, it can decode CW and measure approximate SWR and power output. - [QRP Labs QDX Kit](https://n1ugk.com/2023/04/qrp-labs-qdx-kit/) - The QDX offers a unique approach to digital modes and is a high quality QRP transceiver. Packed with features, this kit is fantastic for ultra portable digital modes. - [Connecting the FT5D GPS to the FT-991A](https://n1ugk.com/2023/05/connecting-the-ft5d-gps-to-the-ft-991a/) - The Yaesu FT5D has a built in GPS which can be connected to other devices as a GPS source using it’s built in data port and a menu setting. - [Sync PC Clock from the FT5D](https://n1ugk.com/2023/06/sync-pc-clock-from-the-ft5d/) - The Yaesu FT5D’s built in GPS can be connected to a PC for off grid time sync. All that is needed is a data cable and Meinberg NTP. - [FT8 with the (tr)uSDX](https://n1ugk.com/2022/12/ft8-with-the-trusdx/) - The (tr)uSDX can be used for FT8 and other digital modes by using it's CAT capability and audio in/out jacks. - [Speaker Mic Adapter for the (tr)uSDX](https://n1ugk.com/2023/02/speaker-mic-adapter-for-the-trusdx/) - Building an adapter to connect a speaker mic to the (tr)uSDX is fairly simple and can improve the experience when operating in phone modes. - [Ultra Portable PC for Amateur Radio](https://n1ugk.com/2023/03/ultra-portable-pc-for-amateur-radio/) - The GPD Pocket is an excellent form factor for portable, emergency, or field work for digital modes and SDRs. It can easily fit in a small pack with other gear, and is a great alternative to carrying a laptop. - [Connecting the TP-10 Printer to the PC-2](https://n1ugk.com/2023/09/connecting-the-tp-10-printer-to-the-pc-2/) - After successfully connecting a TP-10 to the Model 100, I did the same with the PC-2. I also updated the banner program for the PC-2. This gives the PC-2 the ability to print without needing those expensive plotter pens. - [Improved Banner Program for the TRS-80 Model 100](https://n1ugk.com/2023/09/improved-banner-program-for-the-trs-80-model-100/) - After getting the TP-10 printer working with the Model 100, I set out to improve the banner program I wrote for the PC-8. - [TP-10 Thermal Printer](https://n1ugk.com/2023/09/tp-10-thermal-printer/) - I found a great printer for the Model 100, the TP-10. This printer is thermal and uses 4 1/8" paper. It has a serial connection and I've updated the banner program as an example of it's capabilities. - [Tandy PC-8 Pocket Computer](https://n1ugk.com/2023/08/tandy-pc-8-pocket-computer/) - I found the pocket computer model on eBay that I wanted as a kid, but couldn't get. I repaired the printer cassette interface for it, and wrote a banner program using only 964 bytes of RAM. - [TRS-80 Model 100](https://n1ugk.com/2023/07/trs-80-model-100/) - The Model 100 was arguably the first commercially successful laptop computer. I recently acquired one and recapped it to be able to experiment with its capabilties. - [PC-2 for QSL Cards](https://n1ugk.com/2023/07/pc-2-for-qsl-cards/) - Using a PC-2 pocket computer to print a QSL card was an interesting project to test using BASIC and a 4 color plotter. - [Radio Shack PC-2 Pocket Computer](https://n1ugk.com/2023/07/radio-shack-pc-2/) - I took my Radio Shack PC-2 (Sharp PC-1500) out of the archive and restored a Sharp CE-150 plotter / cassette interface. I was able to connect the PC-2 to a TNC and print out APRS traffic. - [(tr)uSDX FT8 Audio Over USB](https://n1ugk.com/2023/06/trusdx-ft8-without-audio-cables/) - PE1NNZ has updated the firmware (beta version) on the (tr)uSDX to add audio over USB. This allows for digital modes such as FT8 over USB without separate audio cables. - [EMP Protective Containers](https://n1ugk.com/2023/03/emp-protective-containers/) - Building your own EMP protective enclosure can be far less expensive than buying one and can be done with readily available parts. Further, you can use the EMP container as a portable go kit. - [Kenwood TS-830S HV Caps Replacement](https://n1ugk.com/2023/01/ts-830s-hv-caps-replacement/) - Replacing the HV caps in the Kenwood TS-830S is a fairly simple job, thanks to KE4AA for the parts. This is the second hybrid rig that I've replaced these HV caps for. - [Connecting the QRP Labs QLG2 GPS Kit to the FT-991A](https://n1ugk.com/2023/04/connecting-the-qrp-labs-qlg2-gps-kit-to-the-ft-991a/) - Connecting a GPS to the FT-991A is fairly simple. I decided to use my QRP Labs QLG2 GPS Kit in my WSPR beacon and connect it to the FT-991A. - [RF Kits EFHW Kit](https://n1ugk.com/2022/04/rf-kits-efhw-kit/) - The ARRL offered an HF Kits EFHW kit which I decided to try out. This was my first kit and I had some good results with the build. - [Archer Space Patrol Walkie-Talkies](https://n1ugk.com/2023/04/archer-space-patrol-walkie-talkies/) - Toys like these Archer Space Patrol walkie-talkies are what got me interested in the Amateur Radio hobby. Today there are FRS radios which are cheap and have more range and features, but these are a classic from the past. - [LiFePO4 Battery Monitor](https://n1ugk.com/2023/03/lifepo4-battery-monitor/) - Adding a battery monitor is a simple way to be able to view the amount of charge remaining, current draw, and voltage from your LiFePO4 batteries. - [Kenwood TS-830S SDR Panadapter](https://n1ugk.com/2023/03/kenwood-ts-830s-sdr-panadapter/) - The Kenwood TS-830S has an IF output which can easily be used to feed an inexpensive SDR for a panadapter display. - [Learning CW](https://n1ugk.com/2022/09/learning-cw/) - CW is still a very popular mode, and even though it is no longer required on any of the amateur radio license exams, learning it is a challenge worth taking on. - [Kenwood TS-830S](https://n1ugk.com/2022/12/kenwood-ts-830s/) - I found a Kenwood TS-830S in excellent condition and it needed only minor cleaning to get on the air with full power output on all bands. - [Why FT8?](https://n1ugk.com/2022/12/why-ft8/) - If you've heard of FT8 and wonder why this digital mode has become one of the most popular digital modes, but you question "why?" or you don't have interest in it, read this post. It might provide some insight into what it is and why it's so popular. I hear many QSOs quite often from older amateurs who were around before these digital modes became so popular who don't have any interest in FT8. I often wonder if it's because they don't see the purpose of it and how it fits into the hobby, or if they find it too much of a technical challenge to start using it. - [FT-991A and TH-9000D with the CX-333 Antenna](https://n1ugk.com/2022/07/ft-991a-and-th-9000d-with-the-cx-333-antenna/) - Connecting multiple rigs to a single tri-band antenna can be done using duplexers and/or triplexers. I've connected my FT-991A and TH-9000D to my CX-333 triband base antenna. - [Alinco DJ-G29T for 33-cm Activity](https://n1ugk.com/2022/03/alinco-dj-g29-for-33-cm-activity/) - Alinco took a gamble producing an HT for two of the least common bands in the United States (and perhaps globally) when they released the DJ-G29T. It’s a fantastic HT and the only commercially sold amateur radio for the 33-cm band. - [Yaesu SP-10 Modifications](https://n1ugk.com/2021/11/yaesu-sp-10-modifications/) - A modified SP-10 external speaker for the FT-991A dramatically improved RX audio quality, a huge improvement over the built in top-firing speaker. - [Reviving the HTX-202 and HTX-404](https://n1ugk.com/2021/10/reviving-the-htx-202-and-htx-404/) - The Radio Shack / Realistic HTX-202 and HTX-404 are solid HTs that survived over time with minor maintenance items such as the internal battery and the high low power switch. ## Pages - [Contact Me](https://n1ugk.com/contact-me/) ## Categories - [Uncategorized](https://n1ugk.com/category/uncategorized/) - [WSPR](https://n1ugk.com/category/wspr/) - [Off-Grid](https://n1ugk.com/category/off-grid/) - [DC Power](https://n1ugk.com/category/dc-power/) - [FT8](https://n1ugk.com/category/ft8/) - [FT-991A](https://n1ugk.com/category/ft-991a/) - [Kenwood Hybrids](https://n1ugk.com/category/kenwood-hybrids/) - 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