It has a sensor keyboard for local commands, includes a plurality of
tuning positions each defined by an adjustable potentiometer, a neon
bulb indicator, a UHF/VHF switch and a two pole momentary contact
touch switch. A common tuning capacitor has a tuning voltage developed
thereacross for controlling the tuning of a varactor diode tuner. A
source of reference potential is coupled across the tuning
potentiometers and closure of any touch switch results in the tuning
capacitor being charged from the voltage reference source through the
selected one of the tuning potentiometers. The neon bulbs yield a
visual indication of the selected tuning position. Circuitry for
automatically placing control of the tuner to a preselected one of the
tuning positions upon turn on of the receiver is also included.A
solid-state voltage-controlled capacitor (varactor or varicap) UHF
television tuner is described which includes a varicap preselector tuned
circuit, a varicap tuned RF amplifier stage inductively coupled to the
preselector circuit, and a varicap tuned oscillator stage, both the
oscillator stage and the amplifier stage being inductively coupled to
the diode mixer stage from which an IF signal is derived. The tuner
employs a single tuning voltage source to tune across the entire UHF
range and also includes provision for AGC. Trimmer capacitors and
inductance adjusting devices of unique and advantageous configuration
are employed to align the tuner. Further disclosed are unique methods of
assembly and alignment for the tuner. In the "recent" introduction (1970's) of several models featuring
touch-sensitive tuning is the culmination of a series of developments in
television tuning techniques over a long period of time. In the
earliest (66/67's) push-button tuner units (v.h.f.) tuning was effected
by the extent to which a multiple slug was inserted into the inline
signal and oscillator coils. This was an improvement over rotary types
of tuner and proved to be very reliable though the reset accuracy tended
to diminish after prolonged use. The earlier u.h.f. and integrated or
multiband tuners were also purely mechanical in operation and though the
designs were considerable technical achievements the push-buttons
nevertheless required quite some pressure to effect channel changing.With the developmente of application covering the use of m.o.s. devices for television and radio channel selection and indication a device relates to a specially developed m.o.s.-technology integrated circuit which is already produced in development quantities. The touch -tuner as the i.c. is designated ans was intended to replace mechanical push-button TV tuner mechanisms. It provides a sensing system which operates in conjunction with a finger -touch plate, a switching arrangement to control a varicap tuner and in addition outputs to operate channel indicating neon lamps. The sensing system comprises a very high -impedance circuit which is effectively shorted out by the resistance of a finger placed across the external touch plate. One side of the touch plate is connected to the sensing input of the i.c. and the other to a positive voltage which may be d.c. or a.c. When the touch plate is operated the chann
els are stepped through in sequence: the
selected channel latches on and the appropriate indicator lights. The
i.c. operates from a standard 33V varicap tuner supply and enables up to
eight channels to be selected. Remote control can be applied to the
system if required and the set is provided for that. Touch -sensitive
control units form a welcome and natural adjunct to the use of varicap
tuner units. As they dispense completely with the need for electrical
switches and switch contacts they should reduce further the number of
service calls for tuning faults. Various circuit arrangements are used
in touch operated tuner control units but all operate when a finger tip
bridges a pair of contacts which incidentally look at first glance like a
single contact. When the finger tip completes the circuit forward bias
is applied to a high gain switching transistor. This in turn switches on
another transistor or transistors and the net outcome is that the
supply to the appropriate tuning potentiometer is connected and held on
while the supply to the previously selected potentiometer is switched
off. In addition a channel ident fication bulb is usually brought into
circuit. As skin resistance is high the touch contacts must be
incorporated in a correspondingly high resistance circuit; in practice
resistor values in the range 10-22MegaOhm are used. The switching
operations are carried out either by discrete transistors or i.c.s.
Transistors form almost ideal switches of course.It's a Circuit arrangement for establishing a reference potential of a chassis of an electrical device such as a radio and/or TV receiver, such device being provided with at least one contactless touching switch operating under the AC voltage principle. The device is switched by touching a unipole touching field in a contactless manner so as to establish connection to a grounded network pole. The circuit arrangement includes in combination an electronic blocking switch and a unidirectional rectifier which separates such switch from the network during the blocking phase.In electronic devices, for example TV and radio receivers, there are used in ever increasing numbers electronic touching switches for switching and adjusting the functions of the device. In one known embodiment of this type of touching switch, which operates on a DC voltage principle, the function of the electronic device, is contactlessly switched by touching a unipole touching field, the switching being carried out by means of an alternating current voltage.
(To see the Internal Chassis Just click on Older Post Button on bottom page, that's simple !)
Nordmende was a manufacturer of entertainment electronics based in Bremen, Germany.
The original company, Radio H. Mende & Co, was founded in 1923 by Otto Hermann Mende
(1885-1940) in Dresden. Following the destruction of the plant during the bombing raids in 1945, Martin Mende (the founder's son) created a new company in Bremen in 1947, in a former Focke-Wulf plant, under the name North German Mende Broadcast GmbH.
The name was subsequently changed to Nordmende: subsequently the
company became one of the prominent German manufacturers of radios,
televisions, tape recorders and record players in the 1950s and 1960s.
In
the 1970s, Nordmende televisions were renowned for their innovative
chassis, and for the rigorous testing and quality control of their
finished products. Both created high costs, however, which soon proved a
competitive disadvantage when the price of colour televisions began to plunge.
In 1969, Mende's sons took over the company, and in 1977 a majority shareholding was sold to the French Thomson Brandt company and the chassis remains the original NordMende until CHASSIS F9. The
following year, the family sold their remaining shares to Thomson.
In the 1980s, the factories in Bremen were closed, Nordmende becoming
purely a Thomson trademark (Starting from chassis F10 F11 they're all THOMSON).
In the 1990s, the name Nordmende was used with decreasing frequency, and it eventually disappeared in favour of the Thomson name. In 2005 Videocon Group acquired all cathode ray tube activities from Thomson. This led to the creation of VDC Technologies, which manufactures TV sets using the Nordmende brand under licence from Thomson.
The Nordmende brand name was relaunched in Ireland in September 2008 by the KAL Group. Although
Nordmende
was well known for its televisions throughout Ireland during the
1970s and 1980s, the company bought the rights to the name and
launched a range of white goods including fridges, freezers, washing machines, and dishwashers, alongside a revamped range of flat-screen TVs and stereos.
NORDMENDE HISTORY IN GERMAN:
Die Vorkriegsgeschichte findet sich unter Mende. Nach dem T
otalverlust in
Dresden gründet Martin Mende (30.12.1898-1982) unter Mitwirkung von
Hermann Weber am 26. August 1947 [FT5901] in Bremen-Hemelingen die
Norddeutsche Mende-Rundfunk GmbH.Die ersten Gehäuse liefert ein Tischler in Achim gegen Kompensation von fünf Gehäusen zu einem Rundfunkgerät. Der frühere Mende-Konstrukteur, Obering. Heer zeichnet wieder für die Geräte verantwortlich [FT49??].
Ab 27. Juli 1948 liefert die neue, zuerst 18 und bald 60 Personen umfassende Firma auf Grund von Währungsreform, Krediten und Zulieferverträgen die neue Radioproduktion.
Das Regime in Ostdeutschland lässt den Namen Mende nicht zu, so dass Martin Mende mit grafischen Konstruktionen im Zusammenhang mit «Nord» an seinen Vorkriegserfolg anschliesst.
Die Hallen der ehemaligen Focke-Wulf AG beim Bahnhof Seebaldsbrück dienen als Werkstätten. 1950 beschäftigt das Unternehmen 700, 1959 schon 3500 und im Zenit 6300 Personen.
1950 beginnt die Firma mit UKW-, 1953 mit Fernseh- und 1954 mit Mess- und Prüfgeräten. Gegen Ende der 50er Jahre heisst die Firma Norddeutsche Mende Rundfunk KG [RP7901].
Nachdem sich Nordmende bislang nicht mit Magnettongeräten befasst hat, bringt das Werk 1958 das erste deutsche Heim-Tonbandgerät mit drei Motoren auf den Markt. Allerdings dominieren auf diesem Sektor eindeutig andere Firmen wie AEG/Telefunken und Grundig. Von Nordmende kommen jeweils nur ein bis zwei Geräte (1960 keines) in die Kataloge. Dafür hat die Firma Erfolg mit einem anderen Neueinstieg:
1958 stellt Nordmende mit «Mambo» ihr erstes Reisegerät vor - aber nicht «das erste deutsche, serienmässig hergestellte und volltransistorisierte Koffergerät», wie man aus einer Quelle nachlesen kann. Danach wird Nordmende in Deutschland auf dem Sektor Reisegeräte besonders stark, obwohl sie keine Röhren-Koffer baute. Immerhin kosten die in «Mambo» verwendeten 8 Halbleiter dann im Einzelhandel DM 98.70, während für die vier D-Röhren der 90er-Serie - auch zum Katalogpreis - etwa DM 35.- auszugeben wären. Preis des ganzen Gerätes: DM 189.- plus zwei Flachbatterien von 4,5 V.
Bis 1969 gibt es ca. 92 Modelle der tragbaren Radios (Koffer- bzw. «Handradios», d.h. «Hand held radios»). Beispielsweise finden sich im Katalog 1961/62 [448] je 11 Tischradios und Radiomöbel sowie 8 Modelle von Reiseradios. 17 verschiedene Fernsehmodelle zeigen dagegen, wo in jener Zeit der Erfolg zu holen war.
Gemäss [FT7901] liegt Nordmende während kurzer Zeit mit der sogenannten «Tippomatik-Bedienung» sogar technisch vorne. Siehe auch Philips etc.
Auch Konzertschränke
scheinen Ende der 50er bis Anfang 60er Jahre eine tragende Säule für
Nordmende zu sein. Dabei verwendet die Firma immer wieder gleiche Namen
wie «Cabinet», «Caruso», «Casino», «Cosima» sowie «Arabella» und
«Isobella» mit wechselnden Zusatz-Nummern oder den Zusatz «Stereo», z.B.
in den Jahren 1959 und 1960/61.Im März 1967 nimmt das Werk die Produktion von Farbfernsehgeräten auf. Zum Firmenjubiläum erscheint eine Gerätereihe mit der Bezeichnung 'Goldene 20'. 1969 übernehmen die Mende-Söhne Karl und Hermann die Geschäftsführung.
1977 führt der verschärfte Wettbewerb zum Verkauf der Mehrheit an den französischen Konzern Thomson-Brandt; die Familie Mende zieht sich anschliessend ganz aus dem Unternehmen zurück. Martin Mende stirbt 1982.
Weblinks:
Commons: Nordmende – Sammlung von Bildern, Videos und Audiodateien
Tote Marke NORDMENDE – Verblasster Stolz. Artikel im Manager-Magazin
Ein neues Programm. Artikel in der Zeit
Fernseher: Inder produzieren neue Nordmende. Artikel bei itespresso.de
Videocon produziert Plasmaschirme für Nordmende. Artikel im pressetext.de
Einzelnachweise
Spectra Color Studio und Spectra SK2 Color de Luxe Studio auf radiomuseum.orgMarke Nordmende mit Digital- und Internetradios zurück, teltarif.de, Artikel vom 2. September 2017.
Company profile. Phillar, archiviert vom Original am 6. März 2008; abgerufen am 26. April 2013 (englisch).
Broschüre – Sprachmanager24. Abgerufen am 5. Januar 2015.
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