I did say "for a receive-only setup". Duplexing UHF on a HF transmitting coax requires more thought and planning to avoid overload or damage, but can certainly be done; and Pete's application with Be
Take care to use the right grade of Loctite. The blue liquid 242/243 should be fine for the three undamaged holes, as it is designed to be released with hand tools. For the fourth hole that doesn't
Or even worse, the centre pin pushes *forward* and breaks the center pin of the fixed socket. That can easily happen with some types of cable, and then you have a rig to repair - or worse still, say
Somebody had to be first, and Mr E Clark Quackenbush [1] did a fine job... for its time, which was in the 1930s. But it's important to remember how long ago that was. That problem became apparent ver
The database method will produce a table with rounded, uniform numbers in the distance column and interpolated heights; but when using a local topographic map it's probably easier to do it a differen
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
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
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
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
[...] 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
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
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 _______________________________________________ _________
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
One thing I forgot: falling ground on the far (shadowed) side of distant ridges can almost certainly be simplified in quite a brutal way. This might be a good first target in step 3. -- 73 from Ian G
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
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
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 ______________
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
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
Thanks for the thoughtful comments, Jim. That last point is entirely fair: we *should* be able to connect an "antenna analyzer" to an antenna, without it falling over due to strong received signals.