Ham Radio Extra Class - 12th Edition - Chapter 9 Part 1 - Antennas & Feed Lines
HTML-код
- Опубликовано: 28 авг 2024
- Teaching for the Amateur Radio Extra License Exam.
Please buy the book using our Affiliate Link: amzn.to/2U3QT77
PLEASE DONATE TO SUPPORT THE CHANNEL - Visit: w4eey.com/inde...
Handouts for this video may be viewed and downloaded from this link:
www.dropbox.co...
Thank you for this.
You are very welcome! 73 de W4EEY
Hi Guys!
Just got my Extra Class license this morning (50/50), due in no small part to the excellent and congenial teaching you both provide. Am very grateful for your dedication and hard work to make a complex and far reaching topic digestible by even the meanest observer (me).
Have recommended your courses to others and will continue to do so.
Respect & 73,
John
KK7JBZ
Very proud of you! Congratulations! 73 de W4EEY
Regarding the opening monologue, a GMRS license will now cost significantly less than before. Up to now the application fee for a GMRS license was $70. With this Report and Order, the new GMRS license fee will be only $35, which is $15 less than the proposed fee and half the cost of the fees previously charged by the FCC. The license is still valid for 10 years and covers an entire family.
Thanks for the Update! 73 de W4EEY
Remember while saltwater has salt as a major part it also contains minerals of almost every description and variying mixture in suspension. -Mike KB7HFS
Use railroad rails as antennas? There are LONG
01:35:34: Extended Double Zepp antenna. For this antenna and other configurations requiring elements to be in-phase, 90° or 180° out-of-phase, you mention phasing lines, but IDK what that means or how to implement in real life. How is setting the phase of the antenna elements accomplished?
Thank you!
73, KK7JBZ
John - Phasing differences are accomplished using different lengths of transmission lines feeding each of the antennas. The longer the line the more "delayed" the RF wave will be. This delay can be measured in time (picoseconds) or in degrees of wavelength. Note that this delay only works out for (technically) one frequency - though in practice it is useful for a band of frequencies.
Dividing the signal to feed two antennas while maintaining an impedance match is another problem. A Wilkinson Divider is one way (ruclips.net/video/3IAVJ4gVunE/видео.html). A broadband RF Transformer is another. A Transmission Line Transformer is another.
Hope this helps! 73 de W4EEY
@@W4EEY Wow, thanks so much! IDK what's up with YT but I didn't get a notice that you had posted a reply. Hence the delayed response.
Very helpful as always. Have done a screenshot and will check out the link. Have bought the ARRL Antenna & Feedline books as well.
73,
John/KK7JBZ
Dr K channel. is now called: Physics Videos by Eugene Khutoryansky