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Max.loop size for 20m. and projects
15MM COPPER TUBING LOOPMagnetic loopantenna calculator by KI6GD : http://www.standpipe.com/w2bri/software/loopcalc.exeThe prog. doesn't have an icon, just klick in the white square above it's name .DO...
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20m. end fed halfwave antenna
Working portable demands an easy setup of your antenna. The antenna also has to give enough punch at a low radiation angle without the need of radials.The vertical end fed half wave antenna is my...
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Simple antenna analyzer 0.1 - 30 MHz
This is a verry simple but good working swr analyzer based on the LTC 1799 smd generator . Tuning is easy: Connect your antenna to the analyser with the meter at full scale and look with the 100K...
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Travel loop antenna type 40-10 and 80-10
Haunted as many others by radio interference and noise I started looking for a wideband portable antenna . Soon I became focused on a magnetic loop antenna. The only catch was the method of feeding...
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Z-Match 100 and mini Z-Match
FIRST TEST WITH A 4C65 TOROIDThis is a one for all antenna tuner with wide range tuning on all the HF bands. The tuner is based on a G3WQW design. A T200-6 should give a better Q but the T200-2 was...
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No ground antenna for backpackers, balconies or plastic car bodies
A common problem with backpacker or balcony antennas is finding a good counterpoise. Also cars and caravans with a plasic body are a problem. Althow nothing beats a set of resonant radials, the shown...
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Coaxial half wave antenna
READY FOR FIELDWORK .USES A COAXIAL T- CONNECTOR For those who don't like to wind transformers there is handy solution for making a have wave antenna for fieldwork on a 12m.fisching pole. Althow a coax...
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Multiband end fed antennas 3.5 - 30mHz
This is a 200 Watt PEP step up transformer for end fed full and half wave antennas without radials, designed as a 200 Watt PEP upgrade by PA0EJH for the originaly Par Electronics designed 25 Watt HF...
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Antenna program Levy
There are not many simple antenna programs out there for free , but this is a welcome exeption.This program made by F5IMV wil calculate a dipole,extended double Zepp,G5RV, ZS6BKW and many other wire...
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LM386 on steroids
A problem with DC receivers is getting enough audio output. With a simple mod you can lift the gain of the LM386 to 34-74 dB .This is the ultimate mod for Pixie type transceivers. My Pixie needed a...
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Adjustable bandwidth
A MAX7400 is an 8th order elliptical filter giving a 100 Hz to aprox. 3000 Hz tuning rate. It means much more selectivity in many homebrew receivers.The output can drive a LM386 . This filter is a...
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Iler qrp 20/40 power mod
The 2SC1945 has 2.5 dB more gain than the 2SC1969 .Without changing the drive train a full 8 - 10 Watt PEP qrp ssb should be possible. The emittor resistors should be changed to handle the current. The...
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ILER 20 QRP MODS
My Iler 20 is finally oparational. The IF has changed to 4.000 MHz and the vxo has 10.250 MHz cristals.(Ebay) The VXO coil now holds 64 turns no.26 (0.31mm) magnet wire and the tuning range with the...
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End fed half wave high pass for 20m.
A common problem with qrp transceivers is a weak frontend . Most end fed antennas use low pass tuners causing high stress due to strong signals coming from BC stations .The High pas tuner used here...
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Broad band 1:1 current/choke balun
In search of a no nonsence 1:1 balun i came up with this easy to build unit. It offeres a almost flat swr curve from 1 to 30 MHz as you can see in the plot. Use 10 turns of side by side1 mm enamelled...
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Traveltuner 3.5-30 MHz
There is no known qrp tuner for both small magnetic loops and longwire antennas for sale so here is an idea for your next holiday . A 2.5 m circumflex loop wil cover 6.5 - 30 MHz , a 5m loop wil...
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Mini Travelloop for receivers
Portable shortwave receivers are normally equiped with short telescopic whip antennas producing a poor reception. This option has more selectivity and a better impedance (low Z) over the 5-21 MHz...
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Helical Loop Antenna for 20m. Window/Balconey use.
Always in surge for a better Window/Balconey antenna i found this nice Russian design by UA9JKW.http://educypedia.karadimov.info/library/slinky8.pdfMy copy is a little smaller with a 70cm loop made...
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Cheap 5A power supply for the FT-817
The Toshiba PA3083U-1ACA laptop powersupply deliveres 15V at 5A.without any noise.It has been my travell supply for more than 3 years now without any problem. They can be found on Ebay for fair prices...
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Single knop Travelloop 6.5 - 31 MHz
First attempt with a large space between the loopsThis small loop can handle 20 Watts from 45-10m . Loop circumference is 2.5 m with a Faraday coupling loop of 50 cm . Sticks are 6 mm glass fibre (...
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