Our HAM Station - Notes on the construction and operation of a multi-op Amateur Radio Station. G3TXQ. QRPpJournal of the Northern California QRP Club Volume 1, 1993 Volume 2, 1994 Volume 3, 1995 Volume 4, 1996 Volume 5, 1997 Volume 6, 1998 Volume 7, 1999 Volume 8, 2000 Volume 9, 2001 Volume 10, 2002 Volume 11, 2003 Last Minute Additions Note that these are very large PDF files.
Power Supply Safety Covers for Astron RS-35A by lorenmcconnell - Thingiverse. This is a set of safety covers for an Astron RS-35A power supply.
I use one of these supplies to power my ham radio equipment. It is reliable, quiet, and produces clean electrical output. The NDB List Datamodes Section. Astron Power Supply Index Page. Note: there is an Astron Wireless Technologies company that makes some very nice antennas.
It is a totally separate operation with no connections to the Astron Corporation that makes power supplies. Astron makes both linear and switching power supplies, and some other products. You should read this Astron Introductory Information article before any of the other articles here in the Astron section It has some very useful information on the Astron linear and switching power supplies, with background, history, model-specific information, both repair and modification suggestions, photos, and more. A Photo Tour of a Bird Wattmeter Element. I bought two Bird elements on a popular auction site: 5 watt, 400-1000 MHz (5E) and 100 watt, 400-1000 MHz (100E).
Both were listed as new old stock (NOS). I put them into my meter about a week after they arrived, connected the meter to a radio and dummy load, keyed the radio, and the needle moved for each one. The other day I picked up a used 80 watt UHF base station and wanted to measure the output power. Project Information Index. There are other good articles on the Technical Info page This page has recently been reorganized.
Everything is still here; items just got grouped together by function. Test Equipment or Parts Thereof: Build your own RF sampler / Iso-Tee for the Bird model 43 Thruline Wattmeter. General Description: This construction article will help you take a dummy slug (more correctly called the dust / safety plug) and with some simple drill press machining, build a very useful RF sampler / Iso-tee for feeding a service monitor, spectrum analyzer, etc., and for a lot less than what Bird wants; (over $100 at the time of this writing!)
If you don't have a dust plug, one can be obtained from Bird directly or a stocking dealer. Concept: The Bird Model # 43 Thruline Wattmeter is a very common test tool among Repeater Builders worldwide. This article will show you how I took a simple dummy slug and turned it into a very useful tool for testing for desense, monitoring waveforms, and feeding other equipment. I've tried to make this article as detailed but concise as possible to benefit readers.
This modification process will not disturb the original intent of the dummy slug; keeping out the dust and shunting the meter movement in travel. Written and HTML'ized by Kevin K. Tips Tricks Info. Ham radio and SWL. Build an APRS IGate – WCARES. Why build an IGate?
There are two fundamental parts of the APRS network that enable communications beyond simple peer-to-peer transmissions. They are Digipeaters and IGates. Digipeaters are just like normal voice repeaters in that when they hear traffic, they rebroadcast it with a little more antenna height and usually a little more power. Thus, they increase the range of the original transmission. Unlike a voice repeater, though, APRS Digipeaters receive and send on the same frequency (144.39 in North America). IGates, on the other hand, are a different story. Families can check in on the progress of loved ones who are driving long distances and well beyond radio range. SV3ORA website. Disclaimer You are free to copy and use everything on this non-profit amateur website.
Note that for copyrighted material, you may need to ask for the authors permission first. All material on this website is provided as is without any guarantee. Many of the material is my own thoughts and do not necessarily represent the truth. It is provided for you to read in order to understand the basic principles of operation. If you find your material is listed somewhere in this page and you want to remove it or get credit for it, please let me know and I will remove it immediately or add relevant notes. . * I am paying lots each year for maintaining this website and you get that for free, please gain knowledge from what you find here and be reasonable about copyright stuff anyway. Website intentionally built using web 1.0 technology.
A stand for the Yaesu FT-817(ND) - KR1ST. The Yaesu FT-817(ND) is a marvelous little radio with lots of features.
One feature, however, is notably absent from this radio. A stand that will lift the front of the radio, so you can actually read the display and reach the controls, is not included. There are several solutions on the market that are well worth looking at, but they will set you back by $20 to $60. If you like to homebrew things and are interested in building your own stand that is sturdy, compact and is virtually free, then read on. BUILD AN AIR WOUND 1:1 CHOKE BALUN FOR HF - THE UGLY BALUN! Another Ugly Choke Balun by G4APL Paul, G4APL, has brought together some excellent examples on how to construct and build Choke Balun in the pictures above and the information below to share with us:
FLAT MAGNETIC LOOP ANTENNA , loop magnetico morbido i6ibe pratola peligna. FLAT MAGNETIC LOOP portable ANTENNA pdf DOWNLOAD SOFTWARE LOOP CALCULATOR 3,5 *- 7 - 14 - 21 - 28 Mhz portatile per Yaesu FT-817 vedi video. Improved Dutch helix/helical for WiFi. High Gain Yagi Wi-Fi Antenna. The leading resource for "Roel Roscam Abbing" on the web! Dave Richards AA7EE. The BIG List of RTL-SDR Supported Software. BM800 Microphone Mods - Welcome to g4izh.co.uk. Dual Band SDR Receiver - Welcome to g4izh.co.uk.
Remote Balanced Aerial Matching Unit - Welcome to g4izh.co.uk. Astron Power Supply Meter Modification. w4zt astron power supply meter modification. Adding Digital Metering to Astron 14V Linear Power Supplies. M0DTS.co.uk all new! 1.8M EME Dish Project This is all there is to the dish and just some 12.5mm wire mesh for the reflector. The Ribs are 15mm square tube. I made a template up in wood first then formed them to shape by hand. I used a large mallet, holding the rib between two large wooden blocks and slowly formed the required shape. Surely someone else can come up with an easier method! Centre Ribs. My CB Installation (in detail) Stunning Ultra-HD View; Sun Timelapse 2015 (NASA/SDO) This video is ten minutes of coolness. This cool time-lapse video shows the Sun (in ultra-high definition 3840×2160 – 4k on YouTube) during the entire year, 2015.
The video captures the Sun in the 171-angstrom wavelength of extreme ultraviolet light. Our naked, unaided eyes cannot see this, but this movie uses false-colorization (yellow/gold) so that we can watch in high definition. The movie covers a time period of January 2, 2015 to January 28, 2016 at a cadence of one frame every hour, or 24 frames per day. VU2ESE's radio experiments: Specan - A reboot of the W7ZOI/K7TAU spectrum analyzer. An easy to build spectrum analyzer for the homebrewers. The KA7OEI FT-817 page. Update your FT-817, FT-857, or FT-897 with the new 60 meter channel.
In the US starting in 2003, amateurs have had a secondary allocation of five specific channels in the 60 meter band. f1ehn. Digital Audio Filter Modules - SOTABEAMS. ***Don't forget your optional Filter Integration Kit*** Our new range of ready-made LASERBEAM digital audio filter modules are the perfect addition to your project or even to your existing radio. Unlike analogue filters, digital filters provide near-perfect characteristics. Vk3ye. The Chart of the Electromagnetic Spectrum - Quad Questions. Open gigapan by clicking the Play icon (opens in light box)