The voice of the fighting Netherlands
During World War II (WWII),
Radio Oranje (Radio Orange)
was a Dutch radio program, aired by the BBC European Service 1
on behalf of the Dutch Government in exile in London. The programs,
that were typically 15 minutes long, were broadcast from London and were
aimed at the German-occupied Netherlands.
It is named after the Dutch monarchy's House of Orange-Nassau .
Radio Oranje is best known for the speeches of the Dutch Queen
Wilhelmina, although she only appeared on the show 34 times in 4 years,
first on the opening broadcast on 28 July 1940 .
The program was on the on the air between 1940 and 1945,
every evening between 20:15 and 20:30 (CET). The aim was to provide
support and information to the Dutch people and also to counter German
propaganda. In addition, it aired the so-called special messages,
in which secret messages were passed to the Dutch resistance
— usually a common saying or a short phrase.
The programs of Radio Oranje were broadcast on the LW, MW and SW bands,
but due to the fact that SW receivers had not been introduced in
The Netherlands until 1935/36, most people only had an LW/MW receiver.
As the Germans did not want the Dutch to receive information from the
Dutch Government, they actively jammed the BBC broadcasts on the regular
LW and MW bands.
To make matters worse, the Germans issued a directive on 13 May 1943,
ordering all radios to be handed in. From that moment on, the possession of
a radio was illegal and people risked a high fine, or even the death penalty,
if a radio was found in their house. Although many radios were indeed handed in,
people often kept one back so that they could secretly listen to
In addition, small covert receivers were secretly built by employees of
Philips and NSF,
and by radio amateurs, 2
from clandestinely obtained components.
Such receivers were made as small as possible, and were hidden inside common
objects, such as cigar boxes, biscuit tins and even picture frames. Such
clandestine receivers were commonly known as Radio Oranje receivers.
On 18 September 1944 the south of the Netherlands was liberated, and on
3 October a new radio station, named
Radio Herrijzend Nederland (The Netherlands Revived),
started broadcasting from Eindhoven, where Philips engineers had secretly
been building a transmitter during the war. This station relayed the programs of
Radio Oranje and vice versa. On 2 June 1945, three days before the liberation
of the entire country, the transmissions of Radio Oranje were terminated .
Part of the BBC World Service.
At the beginning of the war, the Netherlands had approx. 400 licenced
amateurs radio operators. In addition there were many hobbyists and enthusiasts
who were also able to build their own radio.
Radio Oranje receivers on this website
As the Germans did not want the Dutch people to receive any information other
than the plethora of German propaganda, they actively tried to
interfere with the transmissions of the BBC in the LW and MW bands
by deploying a network of jammers. The SW band was seen as a relatively low risk.
In the secretly recorded broadcast (above) of 18 September 1944,
war correspondent Robert Kiek speaks about the liberation of Eindhoven
and the dropping of troops over occupied Nijmegen and Arnhem.
The first part of the broadcast is severely jammed by the German
The image on the right shows one of the original jammers 1 that was used for
this purpose. It is a self-exited free-running oscillator/amplifier,
with two large valves in balanced configuration. A motor-driven variable
capacitor, causes the oscillator signal to wobble (i.e. vary quickly),
causing a humming sound in the receiver.
Although the jammers did indeed cause serious interference in the
reception, they had limited effect. They had to
be close to the receiver to have any success at all, and if people used
a directional antenna, the effect could be reduced.
The effect could also be reduced by altering the position or
direction of the wire antenna, or by adding a so-called Moffenzeef 2
– also known as a Kraut Filter – which was in fact a jamming eliminator.
Several designs of a Moffenzeef are known, but it is unknown which one came first.
Three versions of the Moffenzeef are shown above. The one at the left
(1) was published in the May 1942 issue of De Wervelwind, a propaganda pamphlet
created by the Dutch Government in exile, and dropped in large quantities
over occupied territory by the British RAF .
The second one (2) was developed by Erik Schaaper in Scheveningen (Netherlands),
and built in large quantities. It was advertised as a filter against interference
from vacuum cleaners, but the Germans soon discovered that it was actually
intended as a filter against their jammers . It uses two antennas (no ground)
that are positioned at different angles and heights. By adjusting the
potentiometer and the variable capacitor, the signal from the jammer can be cancelled out, using phase and amplitude differences. For the main antenna
(A1) a curtain rod (in east-west direction) was recommended. The base plate
of the stove (or the stove itself) acted as the second antenna.
The third solution (3) is more complex, but is arguably the most effective
one. It combines the effect of a directional window antenna, with a passive
sense antenna. Being a loop, it is sensitive only to the magnetic component of the
radio wave, and has a sharp null. It was designed and built during the war by
J. Verhagen, and is described in more detail by Louis Meulstee in .
Photograph taken at the exhibition Secret Messages in Museum Jan Cover
in November 2008. The item was given on loan by Museum voor Communicatie
(later: COMM, now: Instituut voor Beeld en Geluid), for the duration of
the exhibition. Photograph copyright Crypto Museum 2008.
Literally translated: Kraut Sieve, or Kraut Filter
— a sieve to filter out the Germans (Krauts). During the war,
the word 'Mof' was the Dutch nickname for the Germans (similar to 'Kraut'
After people had found ways to circumvent the German radio jammers, it became
clear to the Germans that the Dutch did not want to obey, and that the German
propaganda had very little effect on them. As a last resort, they made the
possession of radios illegal and issued a directive on 13 May 1943, that
all radios had to be handed in. The diagram below shows how many people
obeyed the directive in each of the provinces.
- BBC Dutch Service
Radio program of the BBC in the Dutch language, not under control of the
Dutch Government, that existed from 1940 to 1957. It first broadcasted a
speech of the Dutch Queen – Wilhelmina – on 15 May 1940. The programs were
financed by the Dutch broadcasters AVRO, VARA, KRO, NCRV and VPRO .
- Radio Vrij Nederland (VN)
Radio Free Netherlands.
Short-lived predecessor of Radio Oranje, that broadcasted a Dutch program via
Radio Paris. Founded in 1940 by Dutch correspondents living in Paris at the
time of the German invasion of The Netherlands. Terminated one month later when
the Germans invaded Paris .
- De Brandaris
Radio station aimed at Dutch sailors of the (merchant) navy. Founded in 1941
at the initiative of the Dutch Government in exile, and broadcasting from
London. Due to the free and uncensored presentation, it became more popular
that Radio Oranje. In October 1942 it was merged with Radio Oranje .
- Radio Herrijzend Nederland
The Netherlands Revived (literally: Radio Resurrected Netherlands).
The radio service that replaced Radio Oranje
shortly after the south of the Netherlands had been liberated by the
Allied Forces. The program was broadcast from Eindhoven, using a transmitter
that had clandestinely been built during the war at
Exmples of Radio Oranje receivers
By Louis Meulstee
A nice collection of Radio Oranje receivers are described
by Louis Meulstee in the supplement chapters of his excellent book
Wireless for the Warrier - Volume 4, in which he has listed them as
Clandestine Midget Receivers . These supplements are available free
of charge from the Wireless for the Warrier website
but can also be accessed directly from the links below.
Note that the midget receiver described in Chapter 153 is now
in the Crypto Museum collection.
Similar clandestine midget receivers were built and used during WWII in Norway.
A nice collection of these can be found in the following chapters of
Wireless for the Warrior - Volume 4:
HostBBC European Service
First28 July 1940
Last2 June 1945
FrequenciesLW, MW, SW, see below
ProgramDaily between 20:15 and 20:30 (CET)
SuccessorRadio Herrijzend Nederland
LW1500 m (200 kHz)
MW373 m (804 kHz), 285 m (1053 kHz) and 261 m (1149 kHz)
SW49 m (6122 kHz), 41 m (7317 kHz) and 31 m (9677 kHz)
- Wikipedia, Radio Oranje
Retrieved January 2021.
➤ Dutch version
- Wikipedia (Netherlands), Radio Vrij Nederland
Retrieved January 2021. In Dutch language.
- Wikipedia (Netherlands), De Brandaris
Retrieved January 2021. In Dutch language.
- Wikipedia (Netherlands), Radio Herrijzend Nederland
Retrieved January 2021. In Dutch language.
- Andere Tijden, Radio Oranje
VPRO/NTR, 6 May 2009. Episode 272.
- Nederlands Instituut voor Beeld en Geluid, Objecten in beeld: de moffenzeef
YouTube, 30 April 2014.
- Louis Meulstee, Moffenzeef
Wireless for the Warrior - Volume 4. Supplement, Chapter 162, July 2018.
- Jan Corver, Uit den strijd tegen de stoorzenders
Radio-Express, 28 September 1945. 1
- Piet Bakker en Tim de Wolf, De Moffenzeef; Erik Schaaper's bijdrage...
2006. Based on ~1969 interview by Cor Doesburg.
- Nu Actueel, The impact of the German occupation
Noordhoff Uitgevers. 13 October 2020. In Dutch language.
- Het Geheugen, Bekendmaking, Inlevering Radio-ontvangtoestellen
- Louis Meulstee, Wireless for the Warrier - Volume 4, Supplement
Wireless for the Warrier. Retrieved January 2021.
- Instituut voor Beeld en Geluid, Collection of Broadcasts...
SoundCloud. Public Domain. Retrieved January 2021.
Copy of original article obtained from NVHR.
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© Crypto Museum. Created: Monday 04 January 2021. Last changed: Thursday, 01 April 2021 - 09:52 CET.