Sunday, August 20, 2017

Compact Homebrew End Fed QRP Antenna. Post #1225.


If you can't view this video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v-6hq7HAOYjZA.

Here's a handy, lightweight end-fed HF antenna for portable and emergency operations. KD9EAS says he built this antenna for low wattage QRP use "to be compact and inexpensive."  The antenna uses 33-feet/10.06 meters of hookup wire with a 9:1 unun wrapped on a T-106-2 toroid.  The design is based on the end fed matchbox antenna from the Emergency Radio Club of Honolulu (EARCH).

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

http://www.HawaiiARRL.info.
https://oahuarrlnews.wordpress.com.
https://bigislandarrlnews.com.
http://www.arrl.org.
http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon).
https://paper.li/kh6jrm/1430289353 (Amateur Radio News & Information).

Other sites of interest:

Hawaii Science Digest (https://paper.li/f-1476233615).
Hawaii Intelligence Digest (https://hawaiiintelligencedigest.com).
Hawaii Intelligence Daily (https://paper.li/f-1482109921).

Be sure to check the blog sidebars for more antenna and propagation articles.

Opinions expressed in this blog are mine unless otherwise stated.

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM)

Saturday, August 19, 2017

Winding a 1:4 Current Balun with 15 turns. Post #1224.


If you can't view this video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=IR-8T0QjUjM.

A 1:4 current balun is a handy device if you use 450 ohm ladder line, 300 ohm television twin lead, or homebrewed 600 ohm balanced line to feed your antenna. In this video from N7JFP, we see how to make a simple 1:4 HF Current Balun with 15 turns per side.  This balun uses a T-130-2 toroid and 18 gauge copper wire. N7JFP says this is a low power device (around 5 watts) suitable for 20 and 40 meters.

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

http://www.HawaiiARRL.info.
https://oahuarrlnews.wordpress.com.
https://bigislandarrlnews.com.
https://paper.li/kh6jrm/1430289353 (Amateur Radio News & Information).
http://www.arrl.org.
http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated every Friday afternoon).

Other sites of interest:

Hawaii Science Digest (https://paper.li/f-1476234615).
Hawaii Intelligence Digest (https://hawaiiintelligencedigest.com).
Hawaii Intelligence Daily (https://paper.li/f-1482109921).

Be sure to check the blog sidebars for more antenna and propagation articles.

Opinions expressed in this blog are mine unless otherwise stated.

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM)

Friday, August 18, 2017

Apartment loop antenna for HF. Post #1223.


If you can't view this video, please insert this title URL into your browser search box: https://www.youtube.com/watch/v=i6VrbsYsx6s.

If you live in a deed-restricted antenna environment (HOA/CC&R), this indoor loop from Joe Baille may enable you to get on the air.  According to Joe, he used 86 feet/26.219 meters of #16 AWG wire to form a two-turn loop around the ceiling of his apartment. He used a CG-3000 automatic antenna "tuner" to work several HF bands.  Although there is no commentary or test data provided by Joe, the antenna seems to work.  As long as you keep power below 10 watts you should have no problems with rfi.

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

http://www.HawaiiARRL.info.
https://oahuarrlnews.wordpress.com.
https://bigislandarrlnews.wordpress.com.
https://paper.li/kh6jrm/1430289353 (Amateur Radio News & Information).
http://www.arrl.org.
http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon).

Other sites of interest:

Hawaii Science Digest (https://paper.li/f-1476233615).
Hawaii Intelligence Digest (https://hawaiiintelligencedigest.com).
Hawaii Intelligence Daily (https://paper.li/f-1482109921).

Be sure to check the blog sidebars for more antenna and propagation articles.

Opinions expressed in this blog are mine unless otherwise stated.

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM)

Thursday, August 17, 2017

Building the 80m horizontal loop @PE4BAS. Post #1222.


If you can't view this video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=u4efv1tb3ME.

If you have the space, time, and the help of a few close friends, this full-sized 80 meter loop antenna will be worth the effort to design, build, erect, and use. In this video, Bas Lev (PE4BAS show us the 4-hour project compressed into a few short minutes. With a bit of help from friends or your radio club, construction time can be reduced significantly.  While this antenna is perfect for NVIS (near vertical incident skywave) propagation, it will also perform well on several Amateur Radio HF bands if 450-ohm ladder line or 300-ohm television twin lead is used in conjunction with a balanced antenna "tuner." This loop antenna would be useful on ARRL Field Day events or other portable operations now that propagation is favoring the lower HF bands.

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

http://www.HawaiiARRL.info.
https://oahuarrlnews.wordpress.com.
https://bigislandarrlnews.com.
http://www.arrl.org.
http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon).
https://paper.li/kh6jrm/1430289353 (Amateur Radio News & Information).

Other sites of interest:

Hawaii Science Digest (https://paper.li/f-1476233615).
Hawaii Intelligence Digest (https://hawaiiintelligencedigest.com).
Hawaii Intelligence Daily (https://paper.li/f-1482109921).

Be sure to check the blog sidebars for more antenna and propagation articles.

Opinions expressed in this blog are mine unless otherwise stated.

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM)


Wednesday, August 16, 2017

Portable Solar Powered GoKit for Ham Radio. Post #1221.


If you can't view this video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=1_Q0ORT93M.

Here's another informative and well-produced tutorial from Julian (OH8STN), the creator of Survival Tech Nord. Over the past few weeks, Julian has produced a series of videos on "Man Portable Off-grid Power for Amateur Radio". This video addresses the use of solar power for your emergency "GoKit".  Julian's explanations are clear, simple, and thoroughly understandable.  He also discusses
antennas and other equipment needed for portable and emergency operations.

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

http://www.HawaiiARRL.info.
https://oahuarrlnews.wordpress.com.
https://bigislandarrlnews.com.
http://www.arrl.org.
http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon).
https://paper.li/kh6jrm/1430289353 (Amateur Radio News & Information).

Other sites of interest:

Hawaii Science Digest (https://paper.li/1476233615).
Hawaii Intelligence Digest (https://hawaiiintelligencedigest.com).
Hawaii Intelligence Daiy (https://paper.li/f-1482109921).

Be sure to check the blog sidebars for more antenna and propagation articles.

Opinions expressed in this blog are mine unless otherwise stated.

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM)