Thank you to everybody that has replied so far both on and off the list. At the moment I'm leaning towards a Butternut HF2V with top loading wires. I did think about a delta loop but came to the conc
Hi I've been reading the ON4UN book and antenna articles online on and off for a couple of years now but I thought I'd share my situation with some more experienced Guys on here to see if I can perha
John, Threadlockers require ALL grease & oil be removed. Otherwise, they don't work. I've used Henkel/Loctite thread lock) in all sorts of applications. Properly applied, the ONLY way it lets go is
Only for the multi-element yagis. The range measurements for the 2-element do not agree well with later modeling or measurements by others. NBS Tech Note 688 has a peculiar history. Although publishe
Does anyone know how to install an inverted V antenna for 80m on a retractable tower? Is there anything that could be done to prevent the wires from laying on the ground when the tower is retracted?
Since you are in the UK, the best reference is: http://www.qsl.net/gm3woj/latticetower.htm Section 5, 'Grease'. -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek __________________________________
You mean, we shouldn't order tower sections "planed all round"? Here in the Land of Mixed Units, our house is built in feet-and-inches on the ground floor, but from the staircase on up it's all metri
Hey, I'm supposed to be retired here! (But if their people were to call my people, well then, maybe... :-) That's right. It's something new, but you simply follow the on-screen instructions and by ne
A few points from this and earlier postings.... Warning: this has turned into something of a "Guide to Test Instruments", so proceed at your own risk. There are three completely different categories
Ah, the joys of southern California... In this climate, outdoor connectors are something to be used only when absolutely essential. -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek ______________
The problem may be that he needs to decide right now, while he is installing the coax. On the other hand, large ferrite cores will be very expensive imports in ZL, so it won't be cost-effective to sc
It's been a few years now, but in correspondence with Dean Straw about the general topic of creating data sets, I don't recall any mention of conflicts arising from the internal model. -- 73 from Ian
If may be easier than you think, because HFTA already makes a linear extrapolation between data points, regardless of horizontal separation. Faced with 360 sets of computer-generated radial data at 1
Alcohol works too, as it causes the mouth parts to open. (This is true for all species.) -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ _________
What I have said (and consistently, I hope) is that "only the choke's resistance is completely DEPENDABLE" for solving RFI problems. Your insight is a very valuable one, and it may well explain why e
[...] I agree with Jim, but calling this a "brute force" approach is being unkind to ourselves. Real-life RFI problems provide a deeper technical rationale. RFI problems often affect other people, an
Broadly speaking, yes... For coaxial feedlines, "common mode current" is the name applied [1] to RF current flowing on the outside of the shield, regardless of the reason. The outside of the shield t
Neither; or both. The only parameters that can truly be labeled "first causes" of antenna behavior are the physical dimensions of the antenna elements and feedline, their location relative to ground
In more detail... The problem with corroded braid is the poor contact between adjacent strands. This is important because the skin effect keeps the RF current on the outside surface of the entire bun
When a friend delivered 360 files of detailed radial profiles out to 100km from this site, it certainly concentrated the mind about the editing problem! This is messy terrain, with a lot of local det