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Who is Viola?
Our mascot. A fictional person from a computer
game
and from same, our fictional radio station.
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Back to the frontpage: |
More info and latest NEWs:
We normaly broadcast as announced in
the weekends starting at 13:00 CET (CEST).
and sends normally in two hours (to about 15:00 CET / CEST).
If we do not send a weekend due to holiday, illness or death, it
will be announced
in our FaceBook group.
The same applies to additional unscheduled broadcasts.
Therefore :-)..
For more details and
'last minute info',
sign up to our FaceBook Group:
You can also find Radio OZ-Viola on
'Google Maps'.
See North Zealand and search 'radio station' or search directly
for 'radio oz-viola'.
If you want an E-QSL cards
from us.
Then you should in the report you
send, giving us the following information:
PS: You are also welcome to send us a 'sound file' report as
extra info.
' Send your report to: jansteendk (a) hotmail.com '
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Our signal out there.
Most of
Europe, Iceland and sometimes in US
on 5980 / (6055) kHz.
Hvis du bor i vores lokale område, så
kan du se her om du kan høre os via 'jordbølgen'.
Kvaliteten af signalet afhænger dog ofte af sidebånd fra
nabofrekvenserne.
Alle målinger er foretaget med en håndholdt transistorradio med
stavantenne.
The 'Station Master' Jan
Sorensen (OZ8AO).
In our small studio. |
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Inside stations technology:
Our station consists of '3 RF elements'.
An exciter (2.5W AM), a linear driver (40W AM) and a linear
PA stage (150W AM).
More from our 'technical room':
The PA-stage 150W AM / (225W
RMS to the antennas)...
Our PA is a 'Hams PA
stage', mount with extra 'fans' for continuous operation.
plus rebuildt with a 'QB4-1100 tube. |
We are using this
DDS exciter, also homemade..
Data:
Output 2.5W AM (10W PEP), al spurious better than -60dB.
Adjustable frequency range without adjustments, 2 MHz. to 7 MHz.
(+/- 1dB). Adjustable +/- 1 Hz. Stability +/- 5 Hz. 'after warmup'.
AF response 15
Hz. to 50 kHz. Excellent sound, under 1% distortion. |
Our first
homemade PLL Exciter: 2.5W
'balanced AM' (10W PEP). Spurious: -45dB.
Frequency stability after warm up: +/-
10Hz. on 5825 kHz. AF Distortion: Better than 1%.
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Our
sound...
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The AM signal is close to perfect symmetry..
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Can you hear the bass ? |
Distortion measurement via
spectrum. |
White Noise test.. |
Our antennas:
Being used mostly when we
broadcast for our
'Groundwave listeners'.
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It is not the best antenna in
the world, but due to lack of space and neighbors it became the
solution. But good for 'groundwave'. |
Our 'normal operating' antenna
is a half-wave dipole. |
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Wednesday night (23:00 CET
and one hour) we bring our broadcast 'Midnight Jazz'. This
broadcast is mostly intended for our 'groundwave listeners' and
is broadcast on our vertical antenna. This is due to very strong
'sidebands' from our neighbor frequencies. But try to listen
anyway.
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DR Kalundborg is approved as
'frequency standard'..
Transmitting only at 'scheduled times'.
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Erik from previous DR
shortwave department, Stig from Radio 208, WMR and Jan from
Radio OZ-Viola. |
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An upcoming
project under development:
( Draft )...
500 Watt AM transmitter for ourselves or maybe
for other radio stations.
More will follow here.
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