Use your microwave transverter
It is really easy to use an existing narrowband
transverter with current home-constructed digital
ATV (DATV) equipment to transmit and receive
DATV on the microwave bands. Both of the
commonly-used digital ATV signal sources, the
and DATV Express
can generate a DATV signal on any frequency
between 70MHz and 1500MHz. Similarly,
the MiniTioune DATV receiver can tune from
144MHz to 2650MHz.
The main effort required to put such a system
together is in arranging suitable switching
between receive and transmit whilst retaining
the narrowband capability, which is very useful
for establishing contact and calibrating frequency
and dish heading against beacons. The other
factor that needs to be considered is getting the
drive level right: this often means bypassing
the input attenuator on the transmit side of
the transverter so that the 5mW or so from the
DATV exciter drives the transverter and PA to
the correct level. The main components can be
Dave, G4FRE has recently built a Portsdown
transmitter and used the transverter approach to
conduct tests on 24GHz and 47GHz. During his
most recent test he transmitted about 0.2mW of
DATV from a 20dB horn on 47GHz and received
it 30km away (
) using a 30cm dish on
a Pasolink-based receiver
with an IF near
ATV activity is thriving again and this has
been encouraged by the monthly ATV Activity
Weekends. The Sundays are particularly popular.
In January there were 9 stations active in the
south-west. Contacts took place using digital ATV
on 146MHz, 10GHz and 24GHz. Additionally, a
number of stations tested their 5.6GHz FM ATV
equipment, including Shaun, G8VPG/P and I
Adrian, G4UVZ achieved good results with
an indoor aerial on 5.6GHz.
setup he used to receive G8GTZ/P through his
News about planned ATV activity is generally
posted on the BATC Forum
. No log-in is
required to view what is going on. During the
day talkback is generally on 144.75MHz FM.
Stations also use the excellent DXSpot.TV
for coordination. The next Activity
Weekends are on 10/11 March and 7/8 April.
Dave Crump, G8GKQdave.email@example.com
Transmit converter and PA
Existing microwave transverter
G4UVZ’s 5.6GHz station receiving
G8GKQ/P with 146MHz, 5.6GHz, 10GHz and 24GHz.
Using a normal microwave transverter for digital ATV.
G4FRE received at 30km on 47GHz.