Who is Viola?
Our mascot. A fictional person from a computer game
and from same, our fictional radio station.

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 '


 If you don't have your own short wave receiver and a good aerial, try using a SDR receiver instead.

 SDR Receivers:

 http://www.websdr.org/        Menu..
 http://kiwisdr.com/public/    Menu (Kiwi) ..

 Here you will hear us best in the morning and in the afternoon:

 http://websdr.ewi.utwente.nl:8901/?tune=5825AM    Twente Holland.
 http://jnlb0dg4phlqpnun.myfritz.net:8073/    Asendorf (Hamburg).
 http://julussdalen.proxy.kiwisdr.com:8073/   Julussdalen Norway
 http://sa4bna.hopto.org:8073/  Arvika Sweden
 http://sm2byc.ddns.net:8073/    Haparanda Sweden.    Hallingdal Norway
 http://southwest.ddns.net:8073/    England.
 http://emeraldsdr.ddns.net:8073/    Ireland.    http://ozviola.dk/Irland.mp3

 Best at our night broadcasts:

 http://sdr.ok2kyj.cz:8073/    Czech republic.
 http://kiwisdr.hamspirit.de:8073/    Schweiz.    http://ozviola.dk/Schweiz.mp3    Nürnberg Deutschland.
 http://a5.t28.net:8073/    Ukraine.
 http://kiwisdr.briata.org:8073/    Italy.
 Or find one via the SDR-menu's.

Or ... Sometimes you can hear us directly on our 'groundwave' without fading:
http://oz1bfm.proxy.kiwisdr.com:8073/    Vejby Denmark.

 What is AM and what is ShortWave:

 https://da.wikipedia.org/wiki/AM-radio    On Danish.

 You may risk that, a selected SDR is temporarily out of service,
 so have some patience and try again later, or maybe the next day.

 Try also Google....


  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.

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..

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%.

Our sound...

The AM signal is close to perfect symmetry..

Can you hear the bass ?

Distortion measurement via spectrum.

White Noise test..
Our antennas:

Being used mostly when we broadcast for our
'Groundwave listeners'.

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.

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.

DR Kalundborg is approved as 'frequency standard'..
Transmitting only at 'scheduled times'.

Erik from previous DR shortwave department, Stig from Radio 208, WMR and Jan from Radio OZ-Viola.