Transmitting ATV at
5.6Ghz - (6cm Amateur Band)
It is very easy (and low cost) to get on
air on 5.6Ghz (the 6cm amateur band), using the cheap
modules intended to transmit "First Person Video" (FPV)
back from drones to their operators. These units can be
used without any modifications to get on air, and with
simple WiFi plate or dish antennas (and a clear line of
sight path) can be used to send ATV to stations using
the same equipment over paths in excess of 60-70Km.
VK2RTS (Sydney) Repeater has a input of 5.695Ghz.
The FPV equipment receive and transmit
frequencies are set using DIP switches, and most tune to
5695Mhz - but care needs to be taken when selecting
equipment to make sure it does cover this frequency, as
other channels NOT cover the 6cm Amateur Band. Most of
the available brands have 5 - 6 channels within the 6cm.
The FPV units are widely
advertised on eBay and other sites with titles similar
to "Tarot 5.8G 600mW Telemetry TX/RX Combo for FPV Image
Transmission TL300N" and are available at reasonable
prices. The typical units are very small but have good
FM-TV performance with a quoted transmitter spec of
600mW output and receiver sensitivity of -80dBm.
Amplifiers are available to raise the output power to 2
- 5 watts.
FPV - TX/RX Unit
Whilst the basic units work
very well and have been used to transmit over paths of
50Km, power amplifiers to boost the 600mW transmitter
signal to 2 - 5 Watts are available from several
suppliers on eBay and other sites, and will
significantly increase the path length that the units
will work over. Theses amplifiers should be connected
after the transmit unit, but before any antenna change
over relay's (if used)
Be aware that all the 5.6Ghz
FPV units use "reverse SMA" connectors (as used on WiFi
equipment) and that all low-loss cables (unless bought
specifically for the purpose) and surplus SMA relays
will almost certainly have standard SMA connectors -
which will NOT fit.
Adapters from reverse to standard SMA are available on
eBay or other suppliers - search for "RP-SMA to SMA
As 5.6Ghz is used by broadband wireless networks, there
is a wide choice of antennas available for use on the
5.6Ghz ATV. These can range from flat plates/panels to
wire mesh (grid) dishes. Horizontal polarisation has
been chosen as the standard
It is also possible to use satellite mini dish with a
suitable feed, such as a waveguide/horn.
Dishes of this size typically have a beam width of 4-8
Using dish aerials of 30-60cm, line of sight ranges of
80Km can easily be achieved.
P5 (noise free) FM-ATV pictures have been exchanged over
a 138Km path using equipment described here on this page
I, will at some more info soon,
currently I am testing my set-up, as I have NOT my
standard license I am limited in my research (need help
of a standard license amateur to transmit).
So far we have very good results. My antenna sits on a 7
meter mast and can without any problem transmit to
VK2RTS repeater in Lawson (Blue Mountains) from my QTH,
This configuration will cost around $150.
This Info will be updated when more
testing is done. Thanks goes out to VK2ANU and VK2CRJ
for there help.