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Antennas : 15M
21 mhz half wave GP Antenna
updated
- 21 mhz half wave ant -very low radiation angle - full size and light weight- all coax matching system - decoupling care to prevent low angle radiation degrade
The Sperrtopf antenna for 2 meter band
- By ON4CFC Pascal, describe how to build a Sperrtopf or Sleeve antenna for the 144 Mhz, PDF File by antennex
137 MHZ QHF Quadrafilar APT Antenna
- This version of the 135mHz quadrafilar antenna for APT reception is an adaptation from Bill Sykes and Bob Cobey's article Taming the QFH which appeared in the March 1997 RIG magazine.
Vertical half-wave aerials for 4m
- Practical designs pictures and alternative design of antennas for 70 Mhz by Ross Wilkinson G0WJR
3 element 50 Mhz Yagi
- A 3 elements long yagi antenna for 6 meters band by ON6MU
W4JOH Cobra Antenna
- The original Cobra antenna, is a multiband 160 or 80 to 10 meter, designed by W4JOH is built using standard insulated wire of about 14 gauge and fed with 450 ohm ladder line down to the shack into a tuner.
900 MHz antenna
- VE3CVG's 900 MHz 7 Element Plumber’s Delight Yagi Antenna
4 element yagi for 20 meters
- Pictures and plans of a 4 elements yagi beam antenna for 14 Mhz
S50E Danilo Brelih site
- S50e, radio klub cerkno
IK1HGI Beacon
- Beacon from qrss on 28.322,08 Mhz
HB9DHG QSL gallery
- Fully seachable and ordered QSL cards gallery includes front and back of thousands of QSL cards received by HB9DHG
W9BPT Palisades ARC
- This club originated in the mid 1950’s with a small break in the late 50’s early 60’s and a rebirth in the middle to late 60’s.
RF Amplifiers
- Solid State and TWT Amplifiers From 1 MHz to 40 GHz with Power Levels from .1 mil Watt to 2.5 Kw
LEMO Connectors
- Lemo offers over 50,000 circular connectors for a variety of industries including medical, military, and test and measurement.
UHF Reject filter
- This filter is a 0.1 dB Tschebychev lowpass with a rejection of 90 dB
or better at 430 MHz, and 0.2 dB insertion loss at 72 MHz.
APRSa4
- APRS+SA does most of the functions of the original APRS(tm) with a big difference: The maps it uses to plot the locations are Street Atlas 4.0 or 5.0 Maps. This allows great precision in locating objects and stations.
ATPDEC
- Atpdec is an open source program that decodes images transmitted by POES NOAA weather satellite series.
These satellites transmit continuously, among other things, medium resolution images of the earth on 137Mhz.
These transmissions could be easily received with an inexpensive antenna and dedicated receiver.
For more information about receiving POES satellite images consult the rig site.
IK5MEN HF amplifier 10-160m.
- Italian page including pictures schematics diagrams of an home made linear amplifier using four EL509 in parallel. Output power is about 700W.
G3YXM 500 W PA
- 40-80-160 meter band linear amplifier
LA7MI 40W RF Amplifier for 80m
- 40W Linear Power amplifier with FETs for 80m
Some notes about saturation in ferrite- and iron-cores.
Written by LA7MI Stein Torp, N-5005 Bergen
432 MHz Power amp
- by RA3YCR
GJ4ICD's 8877 50MHz Amplifier
- A Compact 8877 50MHz amplifier and Power supply
IK8MKK Home-Made equipment
- Two 50 Mhz amplifiers and antenna switch
YU1AW 2m PA
- GI-7B, GS-31B & GS-35B power amps, 144 MHz QRO
50 MHz GS35b Power Amplifier
- OZ1DPR six meter power amplifier using the russian VHF triode GS35b
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