70cm 5

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70cm 5

38 links

Antennas : 70cm
  • Cross-Yagi 10el Antenna for 70cm - 10 Elements Cross-Yagi Antenna for 433 MHz. The base of the 10el antenna is the recalculated RA6FOO antenna.Circular polarization is realized - by a phasing quarter-wave line, matching of horizontal and vertical polarization antennas
    [ Hits: 173 | Votes: 6 | Rating: 8.83 ]
Antennas : J-Pole
  • A Dual Band VHF/UHF J Pole - This antenna provides continuous coverage of the 2 metre (144-148MHz) and 70cm (430-450MHz) bands and is an excellent choice for base station use.
    [ Hits: 2279 | Votes: 17 | Rating: 6.83 ]
  • Homemade 2M/440 J-Pole Antenna - A 2m 70cm Dual Band J-Pole antenna for 35 USD. An excellent performing J-Pole type antenna, constructed from readily available materials.
    [ Hits: 1044 | Votes: 5 | Rating: 3.4 ]
Antennas : Lindenblad
  • Build a twin-lead Lindenblad Antenna for 70cm and 2m - This document contains the detailed instructions to build a homemade lindenblad antenna using a twin-lead as dipole elements. This document contains 9 pages and includes a detailed construction sequence and some drawings to build this antenna for UHF and VHF ham radio bands
    [ Hits: 1268 | Votes: 3 | Rating: 8.67 ]
Antennas : Satellite
  • Satellite Yagi crossed 2m, 70cm - Construction of an antenna for experimental satellite communication, 8el. (435 Mhz) x 4el. (145 Mhz) Satellite Yagi crossed. No difficulty to built this antenna. Except the gamma match. that requires a little more attention
    [ Hits: 146 | Votes: 0 | Rating: 0 ]
  • UHF VHF Crossed Satellite Yagi Antenna - This home made antenna provides around 10.5dBd gain on 70cm, and 6.5dBd gain on 2m, which is more than adequate to work the FM satellites with a handheld dual band radio
    [ Hits: 371 | Votes: 2 | Rating: 9 ]
Antennas : Slim Jim
  • 70cm Slim Jim antenna - A simple slim jim antenna for 433 MHz. Simple drawings and pictures of a simple Slim Jim antenna.
    [ Hits: 266 | Votes: 0 | Rating: 0 ]
Antennas : VHF UHF
  • 5 Element 2M / 70cm Yagi - On this page is the design for Dual Band 2M / 70cm antenna with 3.2mm elements. The antenna has a 50 ohm designed driver. This Yagi has a unique element called a Open Sleeve
    [ Hits: 1689 | Votes: 10 | Rating: 5.5 ]
  • Dual Band VHF UHF Yagi Antenna projects - On this page are designs for Dual Band 2M / 70cm antennas. All antennas are 50 ohm designed driver. These Yagis have a unique element called a Open Sleeve. 4 Element 5 element and 9 element Dual Band - 2M / 70cm antenna projects
    [ Hits: 752 | Votes: 4 | Rating: 5.75 ]
  • FBK 2m-70cm dualband coax antenna - A travel, or a fixed vertical coax antenna originally designed by PA0FBK. This antenna is very easy to make from a piece of 50 ohm or 75 ohm coaxial cable, and can be either smooth, roll-up version, or rigid cable
    [ Hits: 350 | Votes: 3 | Rating: 9.33 ]
  • Tri-Band VHF/UHF Antenna Design - The TBJ-1 – a triband base antenna was published in March 2017 QST. This antenna covers 2M/220 MHz/70cm in one 6ft 3/4 inch PVC pipe and requires no radials.
    [ Hits: 210 | Votes: 0 | Rating: 0 ]
  • VHF UHF Duo band Yagi Antenna - Duoband Yagi 2m/70cm with 4 Elements on 2 m and 5 Elements on 70 cm and one Feed point. The 4-El.-Ultralight-Yagi for 2m can be used on 70cm with an SWR of 1,5 without any changes.
    [ Hits: 150 | Votes: 6 | Rating: 7 ]
Radio Equipment : VHF-UHF Amplifiers : Mirage BD-35 Technical Reference : Beacon keyers
  • 70cm Beacon - PLL synthesized 70cm CW beacon exciter. The exciter is built arround a slightly more advanced ADF-4351 single chip PLL synthesizer rather then (among amateurs) more popular Si-570 or Si-5351 integrated circuits. The exciter is capable of providing up to 250 mW of RF output power,
    [ Hits: 127 | Votes: 1 | Rating: 10 ]
Technical Reference : Preamplifiers
  • 435 plus 1296MHz ATF54143 Pre-amplifier - The prototype for this amplifier was originally designed for 70cm and was used on the 2004 3B9C Dx-pedition to Rodriguez Island for satellite and EME. It had a noise figure of 0.49dB with an associated gain of 20dB.
    [ Hits: 333 | Votes: 0 | Rating: 0 ]
Technical Reference : Repeater
  • 70 cm Repeater Project - Multi Mode 70cm DIY Repeater Build Project made with two Tait TM8235 and acting as modem a Repeater Builders MMDVM plus a Raspberry PI
    [ Hits: 47 | Votes: 0 | Rating: 0 ]
Technical Reference : Transverters
  • 70cm Mini Transverter - A low cost, low power microwave transverter so that you can operate easily on 70cm band even with a HF or VHF transceiver
    [ Hits: 389 | Votes: 0 | Rating: 0 ]
  • 70cm Mini-Transverter Project - The project in this article illustrates how to do this in a simple and low cost way so that you can easily access the microwave bands using the existing HF or HF/VHF transceiver as IF.
    [ Hits: 252 | Votes: 2 | Rating: 9 ]

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