My Satellite Antenna

Download: Satellite Antenna Plans

Satellite Antenna
DIY Satellite Antenna. To view larger, click here.

My satellite antenna is a Moxon-Yagi-Uda dual band VHF-UHF antenna with a single feed point (connects directly to the radio, no duplexer needed), based on the original design of LY3LP. This allows using a full duplex radio to simultaneously transmit in one band and receive in the other. Properly tuned, this antenna has an SWR (Standing Wave Ratio) of 1.0:1 in VHF and 1.1:1 in UHF.

4I1AWN_antenna2
The antenna’s boom may be split in the middle, for easy storage and transport.

Features

1. Very good RX and TX signals. Check out the logs on my QRZ page or hear the audio recording as received by this antenna in this video prepared by DV2JHA.
2. Easy to build. This antenna build is intended to be very easy to replicate. Very few tools and materials needed to build one. No special parts needed. Anyone can build it.
3. Elegant design. Because it only has one feed point, you only need one dual-band VHF-UHF radio to use this antenna (instead of using two different radios and feed points for each band, thereby eliminating the need for a duplexer). The coaxial cable from the radio connects directly to the antenna (no baluns). To maximize the full capability of this antenna, use it with a radio with full-duplex capability.
4. Easy to tune. You only need to adjust the gap between the Moxon (VHF) driven element, and the Yagi-Uda (UHF) driven element to achieve perfect SWR. If you wish to move the center frequency (the frequency with the lowest SWR), adjust the length of the driven elements.
5. Lightweight. You will begin to appreciate this once you compare it with other antenna designs. Heavy antennas are not particularly useful for hand-held satellite work.
6. Portable. With the split-boom feature, you can easily store and transport this antenna. If needed, you can always disassemble and collapse everything into a very small package.
7. Durable. This antenna design is built to last a lifetime of satellite work.
8. Low-cost. How much does a commercial satellite antenna cost? To build this antenna, I spent an equivalent of 5 USD.

This antenna has been fully tested to work with satellites such as AO-91, AO-92, SO-50, IO-86, and PO-101 (Diwata 2). To build your own satellite antenna, kindly refer to the antenna plans below.

4I1AWN_2019
To view at full resolution, click here. Adapted from the original design by LY3LP. This particular version with a number of modifications is created by 4I1AWN. It uses 3 mm copper tubing elements.

To see this antenna in action (a recorded ‘live’ satellite demo), head directly to Satellite Communications. To view the portable radio setup I use with this antenna, head directly to Portable Radio Setup. 

DIWATA2 LIVE DEMO CNN
The DIY antenna described on this page was used during the live contact via Diwata 2 satellite’, reported on CNN Philippines

Download: Satellite Antenna Plans
For inquiries, please email: 4i1awn@nightskyinfocus.com

Night Sky in Focus
Astronomy and Amateur Radio
© Anthony Urbano (Manila, Philippines)

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3 thoughts on “My Satellite Antenna

  1. Hi
    My name is Salman, am a SWL member of Pakistan Amateur Radio Society and a newbie in this amazing Hobby / Service.
    I’m planning to build a dual band moxon following your instructions and plan for satellite reception.
    I’m a litter confused – – as per your plans, measurements of radiator (2m) is 700 mm, and reflector is 680 mm long but they look equal to each other.
    and as per my calculations total length of copper wire is 3475 mm right ?

    please explain

  2. Hello

    My name is Salman, I’m a SWL from Pakistan.
    I’m planning to make a dual band moxon using your plans however, i’m a little confused with the size of moxon’s (2m) Radiator and Reflector. Radiator is 700 mm of coper wire and the reflector is 680 but they look equal to each other. Could you please tell me the size of coper wire used in Radiator and Reflector.
    also, please confirm the total length of Copper wire used in the antenna is 3475 mm ?

    thanks

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