přístroj k odstranění impulsního rušení (podobný jako Noise Blanker), který se zařazuje do přijímací cesty mezi anténu a přijímač
a funguje v rozsahu od 1,6 do min 70 MHz.Na rozdíl od jiných přístrojů není potřeba pomocná anténa.
Je vybaven konektorem pro PTT, který pístroj odpojí přii vysílání .

napájení 13,8V
vstupní a výstupní konektor BNC
rozměry š.9 x hl. 9 x v.3,5 cm

Ovládací prvky:
IMD - přepíná pásmové propusti na vstupu pro požadované pásmo
GAIN - úroveň signálu na vstupu
BALANCE - vyvážené
OUTPUT - úroveň na výstupu

Pečlivým nastavením těchto tří prvků lze docílit účinného potlačení rušivého impulsního rušení, pocházejícího např. z vadných síťových transformátorů a izolátorů,
motorů, zapalování motorů a generátorů, vadných spínaných zdrojů a měničů (FVE, nabíječů LED lamp, routerů) a dalších jiskřících zařízení produkujících pulsní rušení.
(Potlačí pouze pulsní rušení, nikolv šum)

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* Remove that annoying noise before it reaches the transceiver.

* This is NOT a QRM-eliminator/X-phaser, it does not use a separate antenna.

The NR-1 is an RF interference removal device (Noise Blanker type), which allows the removal of impulse-type
noise in the HF radio spectrum.
The frequency range, in which the NR-1 has been tested to operate, is from 1.6MHz to over 70MHz (modification
for lowfer is possible). It is wideband and it can be used inside and outside the radio amateur bands (e.g. for
listening to commercial shortwave stations too). No additional noise antenna is required for its operation.

NR-1 is a type of Noise Blanker and therefore it only removes impulse-type noise. This noise usually takes the
form of pulses or "spikes" of short duration and high amplitude. Its repetition rate can vary from a few Hz to a
few KHz. In the waterfall, this noise may appear like repeating horizontal lines that cover most (if not all) of the
band. Such noise may be caused by anything that generates sparks in devices such as:
• Faulty power line transformers and insulators
• Motors brushes/commutators (elevators, household electrical appliances, etc.)
• Internal combustion engines spark plugs (cars, motorbikes, generators, etc.)
• Faulty (sparky) inverters and switching power supplies (solar panels, chargers, LED lamps, routers, etc.)
• Any other device (defective or not) that produce sparks one way or the other.
The NR-1 is exceptionally effective on power-line noise, whereas other noise removal devices struggle.

The NR-1 works directly on the antenna side and not in the intermediate frequency that common
radios/receivers noise blankers work on. Furthermore, the principle of operation of the NR-1 is not based on
cutting-off of amplifiers, unlike common noise blankers do. Because of these, the NR-1 has a number of
important advantages, compared to common internal Noise blankers of radios, which are summarized as
follows:

• NR-1 removes noise before it even reaches the receiver. Because of this, the front-end RF stages of the
receiver are unaffected by noise. This improves the receiver dynamic range, as the AGC is unaffected by
noise. In contrast, a common internal noise blanker, removes the noise after it has first passed through
the internal circuits of the receiver.

• NR-1 completely cleans out the waterfall display of modern transceivers. In contrast, common internal
noise blankers (e.g. IC-7300) leave the noise displayed on the waterfall, when they manage to clean the
audio (IF).
• NR-1 removes high-level, high-repetition-rate noises that common internal noise blankers usually
cannot cope with.
• NR-1 is not affected by strong near-by signals. Instead, common internal noise blankers perform poorly
when there are strong near-by signals and they distort the signal quality of the station we want to hear.
This distortion caused by the common noise blankers, is the reason most HAMs prefer to listen with the
noise blanker switched off.
• NR-1 can be used by many radios at the same time. Because it is an external device, it can be connected
to various radios/receivers without the need to modify them.
• NR-1 has a built-in 8-position preselector and helps eliminate intermodulation (birdies) caused by
strong local medium and shortwave stations, on RF direct sampling radios (e.g. IC-7300). The preselector
is relatively wideband and does not affect the sensitivity or the waterfall spectrum in the amateur and
commercial shortwave bands, even at big spans.