east la
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Antennas : End-Fed- Multi-Band End-Fed Antenna Design for Limited Space
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- This document details the construction of a multi-band end-fed antenna, suitable for situations with limited space for larger antennas. The design utilizes a 1:49 to 1:60 impedance transformer to match a half-wave wire antenna fed at one end. Compared to a traditional dipole, this antenna resembles a highly unbalanced Windom antenna with one very long leg and a virtual short leg. The design eliminates the need for radials but relies on the coax cable shield for grounding. The document recommends using at least 10 meters of coax and installing a common mode filter at the entry point to the shack for improved performance.
[ Hits: 76 | Votes: 0 | Rating: 0 ]
- 5 Band Pipe Vertical Antenna
- A simple, cheap and easy to build 26 feet long vertical antenna that works DX on 20 - 10 meters including WARC Bands, it is designed for portability for field days, camping, or permanent installation, cost, and to achieve at least 1/2 wavelength on the WARC bands.
[ Hits: 554 | Votes: 5 | Rating: 6.2 ]
- HD8R Galapagos 2021
- DX Pedition to Galapagos will be active from October 26th to November 7th, from 6 to 160 meters (including Warc bands) on CW, SSB and Digi modes with at least 4 stations on the air at the same time.
[ Hits: 112 | Votes: 1 | Rating: 10 ]
- T32TT Log Online
- T32TT East Kiribati, Christmas Island Log Search provided by clublog. This is 2 man activity from 6m to 160m
[ Hits: 90 | Votes: 6 | Rating: 8.67 ]
- Websdr Polska
- RSP1A receiver with LoG (Loop On Ground) antenna in quiet QTH - southeastern Poland. Very low QRM!
[ Hits: 91 | Votes: 2 | Rating: 2.5 ]
- Resistor combination finder
- If you need a non-standard resistor value you could probably realize a close match using two resistor. If you use two resistor in series it is quite easy to figure out which values give the best match; on the other hand, using a parallel connection it is not so easy (at least for me) to find a good combination.
This resistor calculation tool shows which combinations of two resistors (series or parallel) gives a match better than the closest standard value, for the E12 (10%), E24 (5%) and E96 (1%) series.
[ Hits: 56 | Votes: 1 | Rating: 10 ]
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