Tuesday, November 13, 2018

Building a Doublet Aerial-Antenna. Post 1677.


If you can't view the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=vAYbkVhsSBY.

I've always enjoyed "classic" antennas for their simplicity, efficiency, and low cost.  One of my favorites is the HF Doublet, which can be designed to cover all amateur radio frequencies between 3.500 MHz (80 meters) and 29.000 MHz (10 meters). 

In this enjoyable and detailed presentation, Adrian documents his construction of a doublet HF antenna from start to finish.  By using an antenna transmatch (i.e. "tuner"), a 1:4 current balun, and twin feeders (ladder line, tv window line, or homebrewed 600 ohm feed line), you can use Adrian's creation to cover several amateur HF radio bands--all this with one antenna.  Give this "old timer" antenna a try--you won't be disappointed.

For the latest Amateur/Ham Radio news and information, please visit these websites:

http://www.HawaiiARRL.info.
http://www.arrl.org.
http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon).
https://oahuarrlnews.wordpress.com.
https://hamradiohawaii.wordpress.com.
https://bigislandarrlnews.com.
https://www.eham.net.
http://www.southgatearc.org.

Thanks for joining us today.

Aloha es73 de Russ (KH6JRM).

Monday, November 12, 2018

How To Tune a 10 Meter Dipole. Post #1676.


If you can't view the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=Ogxp3yjAzCs&index=110&list=PLKKNqDVcbnzV-vN-gtGhODMTAkmnUDBX0&t=0s.

Randy Hall (K7AGE) does an excellent job of describing how to "tune" a 10 meter dipole antenna. Although the video will prove most useful for newly licensed radio amateurs, the information will serve as a general review for all hams who wish to design, build, and use simple dipole antennas.  The length of this dipole is 468/frequency in MHz.  The antenna is cut for 28.3 MHz and measures 16.5 feet/5.03 meters long.  Randy shows us how to use a MFJ Antenna Analyzer to trim the antenna to resonance.  The procedure outlined by Randy can be used for any HF band from 160 meters to 10 meters.

For the latest Amateur/Ham Radio news and information, please visit these web sites:

http://www.HawaiiARRL.info.
http://www.arrl.org.
http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon).
https://oahuarrlnews.wordpress.com.
https://hamradiohawaii.wordpress.com.
https://bigislandarrlnews.com.
https://www.eham.net.
http://www.southgatearc.org.

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).

Sunday, November 11, 2018

My favourite magnetic loop for HF Pedestrian Mobile. Post 1675.


If you can't view the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=YswnVmAKSP0.

Australian radio amateur Peter Parker (VK3YE) enjoys experimenting with antennas.  He especially likes to design antennas for portable operations, including what he calls "Pedestrian Mobile." 

In this video, Peter compares two magnetic loop antennas for the "Pedestrian Mobile" situation--one being made from copper tubing and the other fashioned from aluminum tubing.  According to Peter, both magnetic loop antennas performed well on the 40 meter Amateur Radio Band, with contacts ranging between 300 and 1500 kilometers. 

You can find more magnetic loop antennas on his website at vk3ye.com.

For the latest Amateur Radio/Ham Radio news and information, please visit these websites:

http://www.HawaiiARRL.info.
http://www.arrl.org.
https://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon).
https://oahuarrlnews.wordpress.com.
https://hamradiohawaii.wordpress.com.
https://bigislandarrlnews.com.
https://www.eham.net.
http://www.southgatearc.org.

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM)

Saturday, November 10, 2018

How to build the ZS6BKW multiband HF antenna. Post #1674.


If you can't view the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=BfUbL_4VCww.

If you're a fan of the classic G5RV antenna designed by the late Louis Varney (G5RV), you may find this video from the Stamford Amateur Radio Association (W1EE) most fascinating.

The team in this video discusses how to design, build, and use an improved variant of Varney's original antenna known as the ZS6BKW.  This antenna was developed by Brian Austin (formerly ZS6BKW, now G0GSF).  In the early 1980s, Austin created computer programs used in conjunction with Smith Charts to calculate optimum dimensions for the classic G5RV.

This video uses those calculations to design and build a ZS6BKW antenna from scratch.  The video discusses the G5RV, the ZS6BKW, tuning suggestions, and mounting options.  An interesting examination of a classic antenna and its modern persona.

For the latest Amateur/Ham Radio news and information, please visit these websites:

http://www.HawaiiARRL.info.
http://www.arrl.org.
http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon).
https://oahuarrlnews.wordpress.com.
https://hamradiohawaii.wordpress.com.
https://bigislandarrlnews.com.
https://www.eham.net.
http://www.southgatearc.org.

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).



Friday, November 9, 2018

Installation of an N9SAB OCF Antenna. Post #1673.


If you can't view the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=PF0mBpfwa0A.

If you have limited space to install a multiband dipole antenna on your property, you may find this video by Tom (W7TCT) interesting.  In this video, Tom shows us his multiband Off-Center-Fed (OCF) dipole antenna which fits into his limited suburban lot.  He also offers a few suggestions for those wanting to try this dipole antenna variant.  Why not build one and see what results you can gain from Tom's model.  Most of the antenna materials can be found in your junk box or at the nearest home improvement/building supply outlet. 

For the latest Amateur/Ham Radio news and information, please visit these websites:

http://www.HawaiiARRL.info.
http://www.arrl.org.
http://www.arrl.org/arrl-audio-news
https://oahuarrlnews.wordpress.com
https://hamradiohawaii.wordpress.com
https://bigislandarrlnews.com
https://www.eham.net
http://www.southgatearc.org

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).