ham-antennas.blogspot.com
Ham Antenna Blog: May 2014
http://ham-antennas.blogspot.com/2014_05_01_archive.html
Collections of Ham Radio antenna projects from web. Saturday, May 31, 2014. Historical Events in Amateur Radio. 1894-1899- Marconi conducts his wireless experiments in Europe and sends a message across the English Channel. 1901-Marconi sends a wireless signal across the Atlantic. 1900-1908- Thousands experiment with wireless. Few at this time are interested in it as a hobby only. 1904-J.A. Fleming develops the 2 element (Diode) vacuum tube. 1914-1917- The number of amateur radio stations increases. T...
ham-antennas.blogspot.com
Ham Antenna Blog: Make a magnetic loop antenna for 7-21 mhz
http://ham-antennas.blogspot.com/2014/07/make-magnetic-loop-antenna-for-7-21-mhz.html
Collections of Ham Radio antenna projects from web. Sunday, July 6, 2014. Make a magnetic loop antenna for 7-21 mhz. This antenna has several advantages, not least being only 1 metre diameter! So what are its disadvantages? Magnetic loop dimension details. Diameter of loop 1000mm. Diameter of tube 15mm. Width of base 780mm. Diameter of support pipe 42mm. Loop end spacing (for tuner) 50mm. Height of support 1590mm. Gamma match width 310mm. Clean the tube with wire wool before any soldering. Use inverted s...
ham-antennas.blogspot.com
Ham Antenna Blog: July 2014
http://ham-antennas.blogspot.com/2014_07_01_archive.html
Collections of Ham Radio antenna projects from web. Sunday, July 6, 2014. Small loop antennas (magnetic loops). Built well, these small antennas perform really well. Built well, only the bandwidth suffers as a result of miniaturisation. 80m loop [3 x 1.5 x 0.8m], using 15mm copper tube. Top right (and detail):. 80 and 40m loop [1.8m x 1m x 0.8m], using 1m wide 1mm thick aluminium sheet. 160 and 80m loop [octagonal with 1.5m sides]. Using 28mm copper tube. And 272 ohms at 3.7MHz. 244/5 = 48.8A. From these...
ham-antennas.blogspot.com
Ham Antenna Blog: WA1ION version of the K9AY loop
http://ham-antennas.blogspot.com/2011/02/wa1ion-version-of-k9ay-loop.html
Collections of Ham Radio antenna projects from web. Tuesday, February 15, 2011. WA1ION version of the K9AY loop. By Mark Connelly, WA1ION. The K9AY loop antenna. Can provide a cardioid (heart-shaped, single-null) pattern when one end of the antenna is connected to ground through a variable DC resistance. This occurs because of the interaction between electric and magnetic field pick-up patterns. Above are of a K9AY loop tested at sites in Billerica, MA and East Harwich, MA during 1999. Small loop antenna...
ham-antennas.blogspot.com
Ham Antenna Blog: A Shortened Inverted L for 160 Metres
http://ham-antennas.blogspot.com/2014/07/a-shortened-inverted-l-for-160-metres.html
Collections of Ham Radio antenna projects from web. Wednesday, July 2, 2014. A Shortened Inverted L for 160 Metres. Despite the dreadful noise on top band caused by modern electronic gadgets and the difficulty in accommodating a necessarily large aerial in a small garden, I was keen to try to get on to top band. I experimented with some different ideas during 2009, some of which are shown on this. Shortened Base Loaded Top Band Antenna For Small Gardens. September 23, 2015 at 10:44 PM. G7FEK Limited Spac...
ham-antennas.blogspot.com
Ham Antenna Blog: Six-element 2-meter Yagi beam antenna
http://ham-antennas.blogspot.com/2011/02/six-element-2-meter-yagi-beam-antenna.html
Collections of Ham Radio antenna projects from web. Friday, February 18, 2011. Six-element 2-meter Yagi beam antenna. The antenna is fed with coaxial cable at the center of the driven element. Ordinarily, either a matching section of coax, or a gamma match, will be needed because the effect of parasitic elements on the driven element feedpoint impedanceis to reduce it. Subscribe to: Post Comments (Atom). Six-element 2-meter Yagi beam antenna. Antenna Tuning Unit (ATU) For 27-MHz CB Radios. HOW TO MAKE YO...
radio-receivers.blogspot.com
Radio receivers: Links
http://radio-receivers.blogspot.com/p/links.html
Collected from the internet. I'm listing here some of the websites I found useful or they are containing quality materials about radio receivers and electronics in general. Ham Radio related links. Crystal radios - Dave Schmarder. Simple home-built radios - Rick Andersen KE3IJ. Alan Yates' laboratory - VK2ZAY. Pass Band Filters - Miguel Angelo Bartié. Richard McWhorter's Youtube channel. Ray C Ring W4KIA. PA0FRI's Technical information for Hams. Amateur Radio QRP Projects. QRP HomeBuilder - QRPHB.
ham-antennas.blogspot.com
Ham Antenna Blog: April 2014
http://ham-antennas.blogspot.com/2014_04_01_archive.html
Collections of Ham Radio antenna projects from web. Friday, April 11, 2014. Car antenna for the 144-146 MHz. Subscribe to: Posts (Atom). Six-element 2-meter Yagi beam antenna. Figure 18-8 shows the construction details for a six-element 2-meter Yagi beam antenna. This antenna is built using a 2 X 2-in wooden boom. Antenna Tuning Unit (ATU) For 27-MHz CB Radios. 160; This antenna tuning unit (ATU) enables half-wavelength or longer wire antennas to be matched to the 50-? Antenna input of 27-MHz Citize.
ham-antennas.blogspot.com
Ham Antenna Blog: VHF/UHF Dualband vertical antenna
http://ham-antennas.blogspot.com/2011/03/vhfuhf-dualband-vertical-antenna.html
Collections of Ham Radio antenna projects from web. Tuesday, March 8, 2011. VHF/UHF Dualband vertical antenna. Subscribe to: Post Comments (Atom). Six-element 2-meter Yagi beam antenna. Figure 18-8 shows the construction details for a six-element 2-meter Yagi beam antenna. This antenna is built using a 2 X 2-in wooden boom. Antenna Tuning Unit (ATU) For 27-MHz CB Radios. 160; This antenna tuning unit (ATU) enables half-wavelength or longer wire antennas to be matched to the 50-? 160; A very simple and ef...