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#21
December 7th 15, 01:17 AM
posted to uk.radio.amateur,rec.radio.amateur.antenna
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Follow up to Spike ;Bent dipoles?
In rec.radio.amateur.antenna Spike wrote:
On 06/12/2015 18:29, wrote: In rec.radio.amateur.antenna Spike wrote: On 06/12/2015 00:06, wrote: snip Your problem, or at least one of them, is that your first response included this statement: "Sky wave propagation doesn't happen at those frequencies for all practical purposes." I let this slide in the interests of discussion, but seeing as you wish to nit-pick and be rude, we'll revisit this by my asking you what you meant, as you are implying that there is in fact some form of skywave at these low-MF Aeronautical beacon frequencies. Please explain. I see you finally read the link so now you think you are going to sharp shoot the original post. BTW, "for all practical purposes" is synonymous with "unlikely to ever happen". You don't seem to know whether or not sky-wave exists at these frequencies. 'Practically', sky-wave would be unreliable for NDB working, but that doesn't mean to say sky-waves don't exist. When you make up your mind about the topic, let me know what your answer is. To help you, there is a shed-load of information out there on MF sky-wave propagation. The term is "skywave" and it is not known to happen below 500 kHz. While doing that, please also explain what you think it is that causes the claimed variations in the ground wave than enable DX beacon hunters to hear such stations at very long ranges. Search for "ground wave propagation" and read up on it. I can't take that from someone who doesn't know that sky-wave exists at MF. Once again, the term is "skywave". Define MF; there is no exact frequency where skywave ceases to exist, but it has not been observed below 500 kHz. That does not mean that under some extreme ionospheric conditions is can not happen, it means no one has ever seen it happen. Your variable ground-wave is a hoot. The term is "ground wave" and ALL propagation modes are variable due to many reasons; a heavy rainstorm will effect ground wave propagation as it changes the ground conductivity. The relevant quotes are he Sky wave propagation doesn't happen at those frequencies for all practical purposes. Tell that to the beacon DX hunters. That is ground wave propagation; I'd give you a link but you obviously prefer to pull crap out of your ass to reading links. You're a troll, aren't you? Says someone that can not even use the correct terms. -- Jim Pennino |
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