Foundations of Amateur Radio - Episode 78

Discussion in 'Amateur Radio News' started by VK6FLAB, Dec 3, 2016.

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  1. VK6FLAB

    VK6FLAB Ham Member QRZ Page

    bearing.jpg
    The folly of throwing away cruft from my desk last week caused concern for my mental health. Fortunately the bearing lives. This week I look at ball-bearings, no, antennas and how an Amateur License helps you understand the drivel that manufacturers use to describe their product and expose some of the fun and games associated with helping a fellow spectrum user.

    Foundations of Amateur Radio is a weekly radio podcast about the wonderful activity of ham radio and covers the 1000 different hobbies that make up this wonderful pursuit, one concept at a time.

    You can listen to the current and previous edition at http://podcasts.itmaze.com.au/foundations/ or on iTunes by searching for VK6FLAB.
     
  2. W1YW

    W1YW Ham Member QRZ Page

    I have no idea what this is about.

    Do you have something against antenna manufacturers?
     
  3. VK6FLAB

    VK6FLAB Ham Member QRZ Page

    W1YW, thanks for listening, but I'm unsure what's unclear.

    My 4 minute podcast explains the experience I had with an antenna that a friend brought along. The instructions and marketing material were filled with incorrect references to gain and comparisons with non-existent antennas.

    I pointed out several of the errors and went on to suggest that the CB community cannot be held accountable for the errors made by manufacturers and then advised that the manufacturing marketing department talk to the engineering department before sending out their brochures.

    Do I have something against antenna manufacturers? Not particularly.

    Do I have something against crazy and incorrect claims being made? Absolutely.

    Onno de VK6FLAB
     
    Last edited: Dec 4, 2016
    W7GST and KG5PFD like this.
  4. W1YW

    W1YW Ham Member QRZ Page

    Your OP has nothing that takes me there.... what does the video have to do with your OP?

    If you have something against incorrect claims well, then: show us.

    Its 2016. I don't know an antenna manufacturer that revels in false claims. Go name them and go show that the measurements say otherwise.

    There's a now infamous case where a former ham published a 'Small Antenna Handbook' a few years back, claiming that 'antennas on a chip' were bogus and pesudo science--- The latest published projections are for $2.2 billion USD in chip antennas by 2022... well over a billion right now.

    Your link is a library. How are we supposed to find this podcast? You don't name it or directly link it.
     
    Last edited: Dec 4, 2016
  5. VK6FLAB

    VK6FLAB Ham Member QRZ Page

    I'm unclear what you're referring to. There is no video. The podcast is audio only. The current episode is #78, which can be found on the link or by searching for my callsign in iTunes.

    73, Onno de VK6FLAB
     
  6. W1YW

    W1YW Ham Member QRZ Page

    So taking your link I stumbled on the relevant podcast.

    What, exactly is your point here? You make several assertions about contradiction on gain-- for starters.


    There are LOTS of 'antenna gains'. Maybe theye should ALL be dBi, but they seldom are used that way professionally. Same with efficiency: the latest trend is so-called 'total antenna efficiency'. Good luck finding that in the IEEE Dictionary of Antenna Terms..

    Exactly which ones--gains-- are you stating and how do they contradict each other? You can put pictures up here (product sheet?) to back up your assertions...

    Antenna manufacturers aren't stupid and have no interest in deliberately misleading customers....
     
  7. VK6FLAB

    VK6FLAB Ham Member QRZ Page

    Thank you for listening.

    I will not be naming and shaming a manufacturer, since that was not the point of the podcast. The specification sheet referred to several different gains in the same sentence, and I'll quote an example here:

    In my opinion, this is a statement that makes no sense what-so-ever, in any context.

    As I said in my podcast, if only the marketing department would talk to the engineering department before publishing their materials.
     
  8. W1YW

    W1YW Ham Member QRZ Page

    A ground independent monopole can easily have gain--in dBi-- over a 'grounded one'.

    What is usually meant by 'ground independent monopole ' is a vertical radiator with its own counterpoise plate acting as a partial or full (but not infinite)ground plane, as part of the 'antenna package'.

    You are asserting shame but present nothing to support the assertion. Just scan the sheet and block out the manufacturer's name.

    Otherwise how is anyone going to learn from --or believe--your assertions?
     
  9. VK6FLAB

    VK6FLAB Ham Member QRZ Page

    How can an antenna have a 4dB improvement in performance and deliver only 2.5dB actual gain?
     
  10. W9JM

    W9JM Ham Member QRZ Page

    Give a guy a computer and time on his hands and this is what you end up with.
     
    W7GST, KG5PFD, KC5HWB and 4 others like this.

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