4 meter atu

25 links

Transmitting Ferrite Loop for 80-160 - Article from 73 Amateur Radio Today about experimenting on ferrite loops transmitting loop antennas for 80 and 160 meters bands.
[ Hits: 604 | Votes: 3 | Rating: 7 ]

Squarooka Antenna - squared bazooka for 2 meters band - Sort of similar to the one of the 6m omni. Instead of using twin-lead, this design makes use of a more or less regular double bazooka antenna (coaxial dipole). Your attention shall be drawn to the available standart literature, such as Rothammel. In order to "compute" the dimension, Karl Rothammel mentioned that the total length of the dipole shall be 95% of the free-space wavelength. The short-circuit bridges (closing the folded dipole) are to be placed at a distance-fraction being equal to the velocity factor of the coax cable used, which will be 66% using RG-58 or RG174.
[ Hits: 356 | Votes: 0 | Rating: 0 ]

2 Element 30 meter Yagi Antenna - Dimensions and EZNEC plots for a 2 Element 30 meter Yagi antenna with 28 Ohm featuring 4.3 dBd Gain and a 16dB F/B with a good bandwidth.
[ Hits: 914 | Votes: 2 | Rating: 6.5 ]

Delta Loop for 40 and 20 meter Band by UR0GT - This wire antenna for 40 and 20 meter band feature a good SWR. Horizontal side of the antenna is placed at two meters above the ground. Impedance of the antenna are depending by the height of the base from the ground and conditions of the ground
[ Hits: 536 | Votes: 5 | Rating: 7.8 ]

40m 2 elements HQ Traps Yagi - The longest element has a total length of 14m and has a boom length of 5.5 meters featuring a total bandwith of 166 kHz
[ Hits: 174 | Votes: 1 | Rating: 8 ]

The 50 MHz DK7ZB Quadlong - The Quadlong antenna for the six meter band. This antenna feature a total gain of 6,4 dBd, F/B 21 dB and is also available in 70MHz version. Includes detailed pictures and plot diagrams.
[ Hits: 1440 | Votes: 27 | Rating: 9.04 ]

4 el yagi for 50 Mhz - The EF0604S is a compact 4 elements yagi antenna plan for six meters band featuring 8.77 dBi gain and a front back gain of 17.89 dB. Article includes elements dimensions and spacing, along to pictures of some homebrewed examples.
[ Hits: 3751 | Votes: 10 | Rating: 6.84 ]
6 Elements Yagi for 50 MHz - Six elements yagi antenna for 6 meters band. This antenna design is based on the QuickYagi 4 software by WA7RAI, uses a 6.5 m boom, feature 12.0 dBi gain and 35dB front/back
[ Hits: 767 | Votes: 1 | Rating: 10 ]
5 Element LFA Yagi for 6 meters band - A Loop Fed Array Yagi antenna for 50 MHz featuring 11 dBi gain and 23 f/b ratio. In this excellent page the author even includes a detailed drawing in DWG format, with element lenght and spacing measures, in a separa file a full list of material list needed to build this yagi antenna including source and price, the EZnec file for this antenna plan, and a lot of pictures of this LFA Yagi for 50 Mhz. A ten page PDF file containing all infos, is also available to download.
[ Hits: 1179 | Votes: 7 | Rating: 8.57 ]

Delta Loop antenna - This DeltaLoop antenna has a length of 125 meters, divided into three sides of 40, 42 and 43 meters.
[ Hits: 2200 | Votes: 2 | Rating: 7.5 ]

A 5 band log periodic dipole array - Modified version of the Telerana antenna which was orginially featured in the July 1979 issue of QST. The array is suspended within a framework made of fiberglass poles emanating from a central hub with the ends tied together with light weight rope around the perimeter. 10-15-20-30-40 meter band coverage
[ Hits: 10004 | Votes: 12 | Rating: 6.59 ]

Multi Band Slinky Doublet Antenna - An home made doblet antenna made with two Slinkys that are aproximately five meters in length connected with a twin-feed connected to a balanced ATU
[ Hits: 463 | Votes: 1 | Rating: 10 ]

Balcony Vertical HF Antenna - The simple balcony vertical HF antenna made with plastic fishing pole. Just along the pole I install copper wire in 7 meter length. Then was installed ATU. It was used home brew tuner. For each band was used one counterpoise in length 0.8 x lambda/4
[ Hits: 238 | Votes: 0 | Rating: 0 ]

The FD4 Windom antenna - This antenna originated from darc QRV magazine in 1971 should be attributed to DJ2KT, works on 80 40 20 10 meters without ATU, based on the Windom principle.
[ Hits: 3744 | Votes: 3 | Rating: 8 ]

AGCW-DL QRP Contest - The AGCW-DL invites all radio amateurs to participate in the annual QRP CONTEST. Annually on the second Saturday in March from 1400 to 2000 UTC. 80-10 meters bands except WARC
[ Hits: 45 | Votes: 0 | Rating: 0 ]

Ameritron AL-811 Panel Meter Lights - A solutiom for the Ameritron AL-811(H) RF power amplifier, burnt panel meter lights. A common failure with the Ameritron AL-811 and similar amplifiers is that the panel meter lights burn out prematurely. These bulbs are usually integrated into the actual panel meter. The solution for this is to provide the meter backlighting with LEDs.
[ Hits: 1184 | Votes: 2 | Rating: 5 ]

ZL2IFB Elecraft K2 K3 - A page dedicated to the Elecraft K2 and K3 transceivers, Connecting the K3 to your PC Useful K3 features, K3 REF CAL re-calibration of the VFO frequency, W2 wattmeter, KPA500 QSK amplifier
[ Hits: 104 | Votes: 2 | Rating: 10 ]

Yaesu FT-100 specifications - The Yaesu FT-100 is a miniature mobile transceiver that provides coverage of the 160 to 6 meter bands plus the 144 MHz and 430 MHz bands
[ Hits: 1842 | Votes: 0 | Rating: 0 ]

3-500Z Amplifier Project - This article loaded with nice pictures and schematics, describes a 160-10 meter linear amplifier that uses a pair of 3-500Z triode power tubes. It was designed and constructed by William Moneysmith, W4NFR. The amplifier features fast warm up and 1500-Watt RF output with 100-Watts of drive.
[ Hits: 1082 | Votes: 4 | Rating: 9.5 ]

Arduino antenna tuner - This project describes an ARDUINO based automatic antenna tuner, for an end-fed half wave (EFHW) antenna, working on 20 & 40 meter bands
[ Hits: 4908 | Votes: 9 | Rating: 6.04 ]