Moxon Dual Band VHF/UHF satellite antenna

I have built some simple yagis the last years and seen that many have tried a Moxon Dual Band yagi. I decided to try the model by George Smart – @M1GEO. For all details of the antenna please see George homepage.

I have used the following materials:

  • PVC pipe 32 mm diameter
  • PVC pipe clamps for 32 mm pipe. These are to attach the elements with glue and the just clamp it on to the pipe. See pictures.
  • TIG Aluminium elements (Tigrod ESAB OK 4043 (3.2 mm/1000 mm)
    In Sweden you can buy these at https://www.svetsmaskinservice.se/
  • Coax cable direct connection to the VHF element

Some pictures from building

VHF element construction
VHF element test outside
UHF elements completed

SWR measurment

VHF – very good SWR
UHF – better then VHF!

Real tests on UHF and VHF

UHF:
Below a very simple test with RS-44 on UHF SSB and with SDR Console. I will need to do better tests with FM sats like SO-50.

Very simple test on UHF with the RS-44 satellite

This is the second test with RS-44. Recorded with SDR Console v3 and Airspy Mini. As you can see the signal levels are not so high with this antenna so it’s sometimes hard to hear the QSOs. And the fading from the satellite is very clear. The antenna was in horizontal position, vertical was even lower signal levels. It would be fun to compare the antenna with an Arrow yagi…

Second test with RS-44 satellite on UHF

VHF:
Very good RX!
This is a test with DIY Moxon Dual Band VHF/UHF portable satellite antenna. Satellite received is AO-91 on 145.960 MHz FM. In the video you can see the signal fading when twitching the antenna vertically/horizontal. You can also see when pointing the antenna away from the satellite position that the signal drops.
In the last 20 sec of video you can see, in the background, my large yagis (2×6 el) tracking the satellite.

RX test on VHF AO-91 satellite