The design of a 2.4 GHz antenna that is ideal for amateur satellite communications, this antenna is easy to assemble because the design itself tolerates inaccuracies in the construction without really affecting performance

From 1296 MHz up to 24 GHz with excellent RX performance,i will use that antenna temporary on low bands too

With almost 10 dbd gain, we have an effective radiation power erp 10 times greater of the tranceiver maximum output without coaxial-loss

The actual design was choosen mainly because of its broad 50 Ohm characteristics

The Leo Pack is a relatively lightweight circularly polarized antenna system for working satellites using the 2 m and 70 cm bands

A description is then given on how this dual band principal is applied to a fully portable roll-up J-pole antenna

The uhf section is made of 6 elements with gain-optimized spacing as opposed to 7 elements with equal spacing for the arrow, this makes my antenna shorter by 6 inches

The actuator is a cheap and heavy tool with high enough torque, ideal for elevation systems, but in practice it needs quite an effort in order to operate correctly in your homebrew antenna system

Due spezzoni di cavo 75 ohm la cui lunghezza deve differire esattamente di un quarto d'onda della frequenza di 136-137 MHz

L'antenna può venir corredata da due riflettori incrociati.è consigliato un preamplificatore in prossimità dell'antenna

In my case, I had been working SO-35 with a 1/2 wave on 70cm and a 1/4 or 5/8 wave on 2m. With these antennas and a little planning, it is possible to work this bird from a train

Lindenblad is the name of a type of antenna that is circularly polarized yet has an omnidirectional radiation pattern

I recently made my first sstv contact on ao-40 with ja5cu/1

A portable high gain antenna for AO-40,it's work in progress, but it turns up a lovely strong signal

I like Lindenblads because they're easy, cheap, robust, and good performers

The project has built in accurate sun and moon tracking, but may be optionally interfaced to a computer for satellite tracking

The loops should be built with # 8 AWG wire and the reflectors should be increased to about 1/4 diameter

Assembling a Raspberry Pi based Satellite

Choose good sturdy cardboard or other material, cardboard is actually one of the best choices for antennas because it is very light

The gamma-match is much easier to build and adjust, i initially chose this system

For two purposes a cross-yagi can be useful, satellite work or if you need both vertical and horizontal polarization for terrestrial contacts

This antenna was conceived mainly for high-speed digital transmission via satellite

Very easy to home brew & very effective

Dipole is an antenna that can be made by a simple wire, with a center-fed driven element for transmitting or receiving radio frequency, these antennas are the simplest practical antennas

Those calculations were made using Yagimax antenna modeling software

Construction details for antennas, in this case the description and design info for a helix antenna, this antenna, which is very forgiving in tolerances, is an ideal feed for offset fed

A full wavelength in the 70cm band means, a 70cm 27.6 inches long antenna in a quad this means that every side is 17.5cm 6.9 inches long, almost nothing

The antenna is made up of 2 loops at 90 ° making a 90 ° rotation in the vertical plane,the polarization is circular,right circular if the turns rotate counterclockwise and conversely

The 70cm radiator is changed to coaxial antenna design. Coax cable is routed through the bottom ¼ lambda element, thus no balun is needed – the sleeve is actually the balun

More than 20 years ago, it was much more interesting and enjoyable to do qso via satellite than today, it had no internet and no cheap pc computers

Eggbeater antenna consist of two loops , both the loops are connected to each other with rg 58, 50 ohms it should be quarter wave length

A traditional Lindenblad antenna uses four,dipole, driven-elements to create a circularly-polarized, omni-directional radiation pattern

Three antenna were trialled, a 600mm g3ruh dish, a flatter 600mm dish of about .5 f/d and a commercial 640mm off-set satellite dish, for the g3ruh dish and the off-set unit

Traditional Lindenblad antenna uses four,dipole, driven-elements to create a circularly-polarized, omni-directional radiation pattern

Two types of directional antennas that are cheap, fun to build

You can buy cheap inline-amps for tv-sat, they are wideband 900-2400 MHz, some also work in the 47-2400 MHz range

I am using a "Sattrak 3" tracking computer to automate the tracking, the basic mechanics that I will describe can be adapted to most methods of control that use electric motors

I use orbitron to calculate the satellite position and my program remote self extracting or here zip file to communicate between the computer and the shack unit

This is the second antenna array developed for amsat oscar 40

The Lindenblad antenna consists of four half wave folded dipoles slanted 30 degrees to the horizon, oriented 90 degrees to each other in azimuth, spaced 0.3 wavelength apart

Need some coax to run to your antennas, we will talk about coax

Successful communication via ao-40 by using the uhf uplink, a power of 150-200 watts erp was necessary erp is a combination of rig power output, coaxial loss, and antenna gain

I put together a portable antenna that is easy to build, but yet powerful

Vhf-uhf portable yagi-uda antenna construction for satellite communication

View the Earth as currently seen from a satellite in Earth orbit, choose the satellite from the list below