high drive
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Antennas : 40M- 40 Meter Bowtie Antenna
- A bowtie antenna is a type of antenna that reputedly provides higher gain at lower radiation angles than a center-fed dipole antenna at heights considerably less than 1/2 wavelength above ground.
[ Hits: 1421 | Votes: 4 | Rating: 7 ]
- GTV 50 - 3W Yagi Antenna
- A compact high G/T Yagi with bent Drive element by DG7YBN
[ Hits: 386 | Votes: 1 | Rating: 10 ]
- 432 MHz 5 elements Yagi
- 5 Element Yagi with Conventional Driver, this little Yagi has a high F/B, which makes it quite useful as a contest stack.
[ Hits: 725 | Votes: 2 | Rating: 10 ]
- Magnetic Loop Antenna Calculator Spreadsheet
- Excel spreadsheet that help calculating dimensions of a high efficiency magnetic loop antenna for HF bands. Giving in input the loop perimeter, loop diameter and loop conductor will calculate electric characteristics, bandwidth, and efficiency
[ Hits: 1877 | Votes: 4 | Rating: 9.25 ]
- 20m Half-Wave End Fed
updated
- A Half wave antenna has a high impedance feed point. This can be matched using a 1/4 wave stub matching section and converts the 40m vertical into an L-shaped 20m J-Pole antenna. The 300 ohm feeder used for this purpose must be kept away from the ground.
[ Hits: 1841 | Votes: 7 | Rating: 8 ]
- The Midnight Loop
updated
- An Experimental, High-efficiency, Graphic-Tunable Magnetic Loop antenna and loop controller in a 52 pages PDF presentation with drawings and pictures
[ Hits: 1173 | Votes: 2 | Rating: 8.5 ]
- Antennas of Field Day
- Main High Frequency Antennas from the 2009 LARC FARL Field Day, Ford Amateur Radio League. A document comparing antenna performances and flexibility among a G5RV an Carolina Windom and a Cushcraft R7 vertical antenna.
[ Hits: 409 | Votes: 0 | Rating: 0 ]
- Cookie Cantenna Wi-Fi
- Make a cheap, portable, high performance (15-18 db) directional antenna out of commonly available parts that can be purchased in most grocery and hardware stores.
[ Hits: 6565 | Votes: 5 | Rating: 7.6 ]
- Some Useful ZS6BKW Modifications
- The ZS6BKW antenna evolved from an optimization of the G5RV antenna. The SWR on 80m is too high and the 40 ft ladder line matching section is a little too long on 17m and a little too short on 10m
[ Hits: 1017 | Votes: 3 | Rating: 4 ]
- World Grid Square Map PDF
updated
- This free PDF file contains two Worldwide grid square maps. The first map displays the fields (first two letters of a maidenhead locator) while the second includes also squares (third and fourth digit) and it can be useful to determine what is your ham radio grid square. PDF file can be enlarged and scaled to A3 and higher dimensions.
[ Hits: 3269 | Votes: 14 | Rating: 7.15 ]
- Iambic Keying
- Iambic Keying, Debunking the Myth by Marshall G. Emm, N1FN. A keying system controls transmitter activation, ranging from basic switches to electronic keyers that generate Morse code based on paddle input. Iambic keyers, introduced in the late 1950s, respond to simultaneous paddle closures with alternating dots and dashes. Despite touted efficiency, actual benefits are modest, offering about a 5% improvement in keystrokes, diminishing at higher speeds. Iambic keying's practical value is limited and may restrict sending speeds.
[ Hits: 625 | Votes: 0 | Rating: 0 ]
- Icom IC-2300H Review
- ICOM IC-2300H 2 Meter FM Transceiver
A worthy successor to the IC-2200H, a popular high power 2 meter mobile rig QST review
[ Hits: 444 | Votes: 1 | Rating: 10 ]
- CBC International CB Radio
- "CB books, plans, and kits. Repairs, modifications, 10-Meter conversions, amplifiers, FM, unique high-performance accessories. Publishers of the classic ""Screwdriver Expert's"" Guide book."
[ Hits: 10844 | Votes: 13 | Rating: 5.85 ]
- AADE Filter Design
- Dowwnload this free windows programs to design Butterworth, Chebyshev, Elliptic (Caur), Bessel, Legendre and Linear Phase low-pass, high-pass, band-Pass, and band-reject filters. Coupled Resonator band-pass filters
[ Hits: 24825 | Votes: 113 | Rating: 7.16 ]
- 1.5 to 30 Mhz RF Amplifier
pop
- This high range amplifier is very small [SB200 size] Vacuum variable input and output caps as well input and output switching.
[ Hits: 53845 | Votes: 43 | Rating: 3.82 ]
- Autonomous Satellite Tracker
- This two-axis tracker tracks satellites with high accuracy entirely by reference to built-in spatial sensors in conjunction with a 9-DOF (degrees of freedom) sensor attached to the antenna boom and a GPS receiver.
[ Hits: 1711 | Votes: 6 | Rating: 8.5 ]
- Batteries and QRP
- Thanks to the popularity of cell phones, laptops and other personal electronic devices, the battery industry has been market-driven to produce higher capacity batteries in lighter weights than previously possible with yesterday's chemistries.As a result, a wide variety of battery types are available to the outdoor QRP operator.
[ Hits: 504 | Votes: 0 | Rating: 0 ]
- A Transceiver Front-End Protector
- A transceiver front-end protector in high signal level environments. An homemade RF limiter to protect your receiver front-end from high radio frequency.
[ Hits: 656 | Votes: 0 | Rating: 0 ]
- A Modern Directional Power/SWR Meter
- Every ham needs an RF power meter. Here is a high performance unit to build at home.
[ Hits: 1559 | Votes: 2 | Rating: 5.5 ]
- 144 Mhz Stop band TVI filters
- A High pass filter will not help, use a stop-band filter to notch out the beast.
[ Hits: 722 | Votes: 1 | Rating: 2 ]
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