But the RG400 has a *slightly* larger center conductor requiring a different connector (or careful drilling of a standard one). 73, -de John NI0K LMR400 is the size of RG8, center is copper coated Al
If you are going to do a wire Yagi with inverted vee elements, be certain to carefully model it using EZNEC, 4NEC2, etc. The rules of thumb for Yagi design yield a very, very poor antenna. I spent ho
Older Andrew LDF4 connectors had a soldered center pin. -John NI0K wc1m73@gmail.com wrote on 9/8/2019 5:56 PM: I stand corrected. It's Amphenol part number 182130-10. The drawing indicates the center
Art, This situation occurs all the time! Freight truck drivers hate waiting and any of them above a moron will call you ahead with an ETA. The tower company will tend to work with only one shipping c
You convinced me.... I ordered a copy. -de John NI0K De Canck Marcel wrote on 9/15/2019 4:32 AM: Hi everybody, After writing for about 3 years, my book "Advanced Antenna Modeling" is finally availabl
Can I infer that a 3-legged tower with 3 ground wires, each with multiple rods would have a total ground resistance of each wire's resistance in parallel? I.E. 1/R wire1, etc? -de John NI0K Grant Sav
Intermittent connection somewhere? -de John NI0K ed_richardson@shaw.ca wrote on 10/20/2019 11:06 AM: Finally got around to making the long awaited antenna repairs. However I now find myself with a st
And now you can buy high-visibility antenna wire! -de John NI0K Jim Brown wrote on 1/2/2020 10:18 PM: Teflon insulated wire, especially the silver-coated stranded copper I've found on the internet to
Ken, In regard to learning EZNEC, there are a lot of resources to learn the basics of the software- YouTube, a tutorial built into the software, etc. But for more advanced use nothing beats this book
Have you tried the modeling with NEC4? I have and can run the model if you send me the model file. -- 73, -John NIØK VE6WZ_Steve wrote on 5/28/2020 9:07 AM: How important is it to get that Beverage t
$33 for the 5 page article. I'd like to read it but I'm not sure there would be enough unique info to justify the price. Perusing the IEEE website I wasn't able to find the cost for individuals to be
Jim, I noted that your two links are modeled using NEC2. Let's see the results using NEC4. -de John NI0K The differences jump out at you when field strength for multiple mounting heights are plotted
You might want to model this before building it, if you haven't already done so. The inverted vee configuration isn't very good for low angle radiation. I built a 7 element for 40 but haven't complet
There's a fellow making copies of the Rohn plates. Seems like he is in Wisconsin. -- 73, -John NI0K Phil wrote on 7/4/2020 9:02 AM: Does Rohn offer flat bottom and top plates for 45G? If so, buy one
I'm sure this has been covered before, but a search of the archives didn't turn up anything. I have 80' of 25G, well guyed, and a TH11 at the top turned by a T2X. I'd like to add a 40M beam, somethin
JK antennas have designs that you might look at for ideas. -de John NI0K john@kk9a.com wrote on 7/9/2020 8:23 PM: In the past I found it difficult to design interlaced Yagis so I have avoided buildin
I'm pretty sure that it is an 80M mobile resonator mounted to the top of the 14AVQ. Radials are everything! -de John NI0K Gary wrote on 7/14/2020 8:41 AM: Greetings, I am wondering if anyone has seen
Balun Designs recommends and sometimes puts weep holes on the bottom of their balun boxes. I had some cable junctions in an 8" 'waterproof' electric PVC box. I traced a failure of the connections in
The spec on switches few look at is- isolation. This isn't terribly important if you are switching antennas for a transceiver. It IS terribly important if you are switching radios between an antenna-
Power line people do this all the time, but they have no-concrete anchors with much more holding strength. Soil type will greatly affect the anchor strength of screw-in anchors. Clay is good, sand is