ARLA/CLUSTER: Será que há necessidade de repetidores digitais D-Star nas bandas de amador.?

João Costa > CT1FBF ct1fbf
Segunda-Feira, 12 de Dezembro de 2016 - 11:01:54 WET

Ham Radio and the Lack of D-Star Repeaters

* D-Star* is one of the modern digital communications modes which are
gaining pace in the Ham Radio world. Call routing GPS location and data
transfer are three benefits to the new radio ham with an interest in
digital communication. Ham radio is essentially about communicating with
people and how this is achieved is a matter of choice for today's Ham

When H.F. conditions are poor and Maximum Useable Frequency measurements do
not allow traditional Radio signals to be propagated around the world,
D-star or one of the other popular digital voice modes can make a
significant difference to the keen radio ham who likes to converse, or as
we say in the Ham Radio World, engage in a Q.S.O., which means to be in
contact with.

How do you operated on D-Star when no local repeaters are within your
vicinity. The answer to this problem is to secure a Digital Voice Access
Point, or D.V.A.P.; this small device simply plugs into the USB port on
your computer or laptop and allows any suitable D-star transceiver to
connect to the International digital network.

The D.V.A.P. is available on two metres or seventy centimetres and is
essentially a low powered transceiver on either of these bands. The output
of the device is around 10 mill watts which is strong enough to allow
connection from a hand-held transceiver to connect to and receive the
digital signal. A USB lead is supplied together with instructions on how to
download the software from the manufactures website.

On one end of the D.V.A.P. a s.m.a. socket allows connection to a suitable
Aerial, a stubby aerial is supplied but I have found connecting the device
to an outside vertical improves not only the range it also allows for a
more stable connection. The D.V.A.P. was not designed to be plugged into an
amplifier and looking at the spectrum of my model which is the two metre
version I have discovered that the low powered signal is not as clean as
other low powered devices, however it works very well and achieves its
purpose which is to allow reflector operation and International
communication where no D-Star repeater exists.

D-star has its place in today's Ham radio community; it is an effective
communication system between continents and will probably improve as time
moves forward. I speak with several mobile stations in the U.S.A. On a
regular basis and find the mode convenient to use while operating
pedestrian mobile with my hand-held I-com ID-51-E transceiver. For those of
you who no longer can erect aerials outside due to physical conditions, or
due to problems of old age, D-star and the D.V.A.P. gives you the
opportunity to engage in Ham Radio communication which you may have enjoyed
for a number of years using conventional multi hop propagation via High
Frequency Ham bands.

* John Allsopp G4YDM*

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