is een betaalbare counter voor
Digitale en Analoge signalen. Door zijn
compacte pocketsize afmetingen kan de DDS-SC-1 op iedere
locatie worden ingezet. De DDS-SC-1 is uitermate
geschikt voor het meten van frequenties van GSM, GPRS,
Digitale Transceivers, Data-Transmitters en snel
schakelende Analoge Zenders. Deze counter weegt slechts
210 Gram, heeft een interne NiCd-accu-pack en word
geleverd met laadadapter en 7-secties telescoop antenne.
- 7 digit Liquid Crystal Display
Frequency counter for digital, on/off keying and
analog signals with a minimum pulse width of 250
Ultra sensitive synchronous detector - 16 section
bargraph to show RF signal strength
(-35dBm to 0dBm)
Two range positions - the 1 GHz position for
frequencies between 30 MHz and 0.8 GHz and the 2.8
GHz position for frequencies between 500 MHz and
Squelch adjustment for input signals
Hold switch to lock display
Low battery indicator
- Low power consumption (Average 5 hour battery life)
- SQL Knob - This knob turns the RF counter on and
tunes the squelch up or down to set the signal
strength for reception.
- Range Switch - This should be switched to the 1
GHz position for frequencies between 30 MHz and 0.8
GHz and switched to the 2.8 GHz position for
frequencies between 500 MHz and 2.8 GHz.
- Hold Button - This holds the current display and
stops the counter from counting.
- Calibration - The calibration adjustment opening
is located on the front panel of the counter. This
allows access to the trimmer capacitor that provides
about a 10 PPM adjustment range of the time base
oscillator. This is not usually necessary but to do
so read a signal of a known frequency before
adjusting the trimmer for correct frequency display.
If you calibrate at 4.1943 MHz or above then the
counter will be more accurate.
Electronics, Corp. guarantee the RF counter and its
accessories for one year against defects in manufacture.
This warranty does not cover items that have been
modified, subject to unauthorized repairs, misuse or
abuse. This warranty does not cover damage caused by
excessive power levels applied to the signal input.
make any kind of connection between the RF counter and a
RF counter can operate for up to six hours from its
fully charged NiCd batteries. They are charged when
the unit is plugged into the supplied AC/DC adapter.
Full recharge will occur over 12 to 16 hours. Before
recharging the batteries you should be deep cycled
occasionally by allowing them to completely discharge
to maintain maximum battery capacity. The NiCd
batteries should last for several years. However, it
is a good idea to check them every twelve months for
signs of corrosion or leakage. Always replace the
whole set if any one cell fails.
- NiCd Operation
When using the RF counter with an antenna for
signal pick up, random frequencies may appear on the
display. This is quite normal and is caused by the
high gain of the receiver circuits, which amplify
noise in the absence of a strong readable signal.
Never get the unit too close to a transmitter as
internal damage will result.
The supplied telescopic antenna is best for
general purpose use. This is because its length can
be adjusted to suit the frequency required. Usually
you will want a shorter antenna for UHF and a fully
extended one for VHF / HF.
Reception Distance From Transmitter
The distance from which you will be able to
receive frequencies will depend upon the type and
location of the transmitting antenna, transmitter
output power and the frequency in use.
Ohms (BNC Socket) VSWR less than 2:1
MHz - 2.8 GHz
less than 5 mV
10 KHz for digital signals or On/Off
1 KHz for Analog
than 1 PPM at room temperature
80 mm high x 68 mm wide x 31 mm deep
Stamped aluminum with black anodized
Internal 4 x AA 600 mAH NiCd pack
9 VDC 300 mA