Category Archives: Cables
As soon as I get my Yaesu System Fusion FTM100-DR online, I want to mate my Bencher paddles to the new MFJ-490X Menu Driven Memory Keyer that I picked up at the 2016 Dayton Hamvention last week (May 21, 2016). I am itching to get these two toys working in some CW / More Code Contesting very soon! 5 programmable memories plus all sorts of keyer speed, weighting, side tone, hand key capability, serial number decrements, random code practice, iambic settings, etc.
(See video below!)
MFJ-490X Memory Keyer Instruction Manual
THE BEST Multimeter Tutorial
The voltmeter… the Volt-Ohm Meter… the Multimeter… digital or analog… continuity… amperage, voltage and ohms… COME ON, MAN! What is it and how hard is it to use in the every day life of a ham radio enthusiast or just someone working in their workshop? Once again, Afrotechmods has an excellent tutorial on his YouTube channel for us to learn from!
Any one who has EVER coiled wire, coaxial cables, audio cables or even a hank of rope knows UNCOILING it has at one time or another created a “rats nest” of tangled mess that will increase your blood pressure, makes you exceedingly cranky and often has caused Tourettes-like symptoms. Fighting an unruly coil of coax or audio cable wastes a lot of time when setting-up a gig, a Field Day site or even coiling a power chord at home! Having spent years working in television studios, control rooms, and other audio gigs on a daily basis, I learned early on from the engineers that there is ONE way to coil cabling… W2AEW shows that in his video! (P.S. Engineers can be especially grouchy if you don’t coil correctly and THEY get to untangle YOUR improperly coiled rats-nest from a previous gig tear-down as they work on an important production. Time is money.)
These are very handy for all sorts of your 12 volt ham radio projects!
Will be looking for these at the next hamfest!
Recently I remodeled the attached garage into an additional room (which will include my revised ham shack) so that it became a functional area. Before hanging the dry wall I ran both electrical circuits and a network circuit so that I could not only supply power to the whole room but also 2 circuits for my ham radio equipment and computers. After pulling the CAT5 cables I had to terminate them for hooking up the wireless router and computers. This video shows and explains the exact sequence of the individual multicolored CAT5 wires and the order they need to be slipped into the connectors before they are crimped. WRITE DOWN THE WIRE COLOR CODE ORDER GIVEN IN THE VIDEO TO USE WHEN YOU ARE READY TO MAKE THE CONNECTIONS.
This video shows how to measure the value of unknown capacitors and inductors using your oscilloscope and a simple pulse generator. There are many ways to do this, but this video focuses on just two basic techniques. The video was inspired by this blog post on scopejunction.com:
The techniques are very simple, and are a good example of basic principles of RC and LC circuits. Another bonus is that it shows another use for the fast-edge pulse generator that was shown in a video I posted several days earlier on making your own basic TDR:
The capacitors are measured by simply measuring the RC time constant, and the inductors are measured by making a simple LC tank circuit and measuring the resonant frequency.
This video shows one way to use a scope and function generator to measure the length of a piece of coax transmission line as well as estimate its impedance. It uses a “poor man’s TDR” type of measurement by launching a pulse into the coax and measuring how long it takes to return after being reflected by the open circuit end. This same technique can be used to determine the distance to a fault (open or short). A simple method for determining the impedance of the line is also shown.
This video touches briefly on transmission line and reflection theory, but is definitely not intended to dive deep into these topics. There are literally books written about this topic – so that won’t be covered here.
If you are going to connect audio equipment devices you will most likely run into the XLR male and female connectors at some point. Or maybe you need to repair a cable that is no longer working. This video is a good example of how to make the proper connections! It’s not difficult to do.
If you are looking for coax, antenna wire, connectors, rotor cable, insulators, rope or the tools to make antennas Davis RF Company is a place I like to use.
Click link below to go to the Davis RF website…
Need to figure out what cables to use or what the pinout configuration should be? This is a nice resource for just that!
Welcome to the Hardware Book. Internet’s largest free collection of connector pinouts and cable descriptions. (Click the following link…) http://www.hardwarebook.info/