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Search results

  1. N

    Regarding antennas, what does counterpoise mean?

    There's a lot more going on with a mobile installation than we may first imagine, this image depicts some of what is going on, along with the equivalent circuit: This image appears in Les Moxon's, G6XN, book HF Antennas For All Locations, and whilst it is a book that contains many a 'ham'...
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    Regarding antennas, what does counterpoise mean?

    I have vol2 pdf if you you're interested
  3. N

    Regarding antennas, what does counterpoise mean?

    Reflections isn't a document, it's a book, are you thinking of 'Another Look at Reflections' as can be found on the net?
  4. N

    Does height above Earth effect the common mode current response?

    Including the mast is important, it's the very reason why isolating the coax alone (RF choke) on a DC grounded vertical isn't enough to eliminate CMC, the mast will carry the CMC instead, it's worthy to note that unless the vertical antenna has resonant elevated radials then potentially the...
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    ¿ is height really might?

    I've worked in Nova Scotia, I've seen what you guys eat, we only see such things in a zoo here :blink:
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    ¿ is height really might?

    I think you should take a look at what you actually wrote as I see you have misquoted what you said, you make an exclusive statement, he either accepts things cant get any better or he's not a reasonable person, as Ive already stated he'd like a taller tower, the reader is left no choice but to...
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    ¿ is height really might?

    I can understand why some will believe it impossible, it's the same when someone the other side of the World questions why my signal can be so strong with 75W and a vertical antenna on a backpack, it's because they haven't experienced it, that's not necessary theoretical understand, but...
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    ¿ is height really might?

    Ad hominem is where one attacks the person, not the argument, that isn't disagreement it's condemnation, however I'm not going to try and convince you either way, you'll see it how you see it :confused1:
  9. N

    ¿ is height really might?

    Because you were so sure of this I thought you had modelled this and knew what you were talking about, but my curious nature got the better of me and I decided to carry out some rudimentary modelling of my own, and guess what, you're wrong. Not satisfied with suggesting the chap needs to study...
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    ¿ is height really might?

    I make a comment in a forum about a discussion I had with someone and that's all you need to decide he needs to learn something about antennas, if only everything in life were that straight forward :blink: As for the difference between the two antennas, that's most definitely one of the...
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    ¿ is height really might?

    I often speak to a chap in Australia who has a 200' tower with stacked 5 element monobanders, granted this is for 20m, but he's still not happy, his antenna at 200' doesn't have as low enough take off angle as he'd like. The difference between his lower antenna and upper antenna on our last...
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    ¿ is height really might?

    Reliability is, and that's why we tune our system, and not just the antenna, if height played no part in reliable DX, then there'd be no point in a tall tower, we are talking horizontal polarisation by the way, I do mighty fine with a vertical at ground height ;)
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    ¿ is height really might?

    Height = Might, sometimes, I guess it depends what that height means, real long haul DX, yeas height every time, however that isn't always the case, a study of arrival angles will give you an indication of the take off angle required to achieve a particular goal, and here one size does not fit...
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    imax 2000 with or without?

    IF you intend to use the groundplane kit then you need to consider a couple of other actions to take, the antenna must be isolated from the mast and you must choke the coax or the groundplane won't work as it should, what we mustn't do is give the ground current any option, but to use the radial...
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    10 meter mobile, 102 whip vs Larsen NMO 27 (or similar)

    If it wasn't repeatable I'd have said magic fairy dust blew in the right direction, but I was based in Crete for a month and these figures were repeated on numerous occassions with numerous stations, not just myself. I agree about the S meters, that's why I introduced the term calibrated S meter...
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    10 meter mobile, 102 whip vs Larsen NMO 27 (or similar)

    102" on the roof, win win :D The only real way to find out which would be better, test them both, I don't know what the NMO antenna is, but I'm very familiar with the 1/4WL vertical as I use one. If you bumper mount the 102" then the currents in the car would be in opposition to the...
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    New mobile antenna

    I know I should have stolen the money out of my wife's purse and buy both, I regret not buying it as the Scorpion was selling for £390, and if I was to import new to the UK it would cost around £1,100, but my head ruled the heart this time. I already have an MFJ269, but I've promised myself an...
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    New mobile antenna

    There was a chap locally selling his as new SA680, I was soooo tempted, but had to think, another antenna or an AIM4170C antenna analyser, with the former I'd have a good mobile antenna, with the latter I'd have a very handy tool that would help me build as many antennas as I fancy, a bit like...
  19. N

    New mobile antenna

    The screwdriver is my day to day antenna and my home brew bugcatcher style 8' antennas are my preferred choice for DX, for 40m and 80m I use the screwdriver antenna with 5' element and huge capacitance hat, if I'm really going for it then I use a full size 1/4WL for 40m and an inductively and...
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    New mobile antenna

    Ok, so my thing is mobile radio, be that on foot, bicycle, or in the car, usually by the sea, however I spend a lot of time driving to and from work so that forms the bulk of my on air time. When I park up for a DX session, I like big antennas, 1/4WL antennas to be precise, now this isn't such a...