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The WSE RX10700 is a converter that converts two radio frequency signals at
10.7 MHz to 2.5 MHz.
The WSE RX10700 is designed for use together with the WSE RX2500 as a part of
a receiver for the amateur radio bands.
The WSE RX10700 contains four crystals; the center frequency can be set
to one of the following values: 10.675 MHz, 10.700 MHz 10.725 MHz
or 10.750 MHz.
This way the frequency coverage is extended from the 93 kHz obtainable
at 2.5 MHz with the RX2500 to 168 kHz at 10.7 MHz.
The RX10700 is intended to be the second IF of a receiver system that
uses the RX70 for the first IF. The RX70 contains five crystals and
the two units together provide a frequency coverage of 0.5 MHz at 70 MHz.
Other converters convert from amateur bands to 70 MHz in 0.5 MHz wide
segments.
The WSE RX10700 was sold in the years 2002 to 2010 in a quantity of
about 50 units for a price of 2760 SEK excluding VAT.
The WSE project is now closed but there is some left-over from the
project that we offer here:
WSE surplus
WSE RX10700 technical data
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Input
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Two BNC connectors for two receive channels.
Nominal input impedance 50 ohms.
SWR < 2 for frequencies between 10.4 and 11.0 MHz.
Maximum input RF power +25 dBm.
Note that the wideband input is unprotected.
A single pulse with a voltage above 6V could damage the
input transistor.
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Output
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Two BNC connectors for two receive channels.
Nominal impedance 50 ohms.
SWR < 1.5 for frequencies between 1.5 and 15 MHz.
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Bandwidth
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500 kHz at -3dB.
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Supply
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DC +15V and -15V at 0.6/0.7 A (20W)
The supply is connected on a 9-pin d-sub.
pin 9 = DC ground
pin 5 = +15V DC, 0.7A
pin 4 = -15V DC, 0.6A
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Computer interface
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A simple computer interface is used to select one of the
four crystals.
The computer interface is on the same 9 pin d-sub connector
as the supply voltage.
pin 1 = Select
pin 2 = Data
pin 3 = Status
pin 6 = Clock
pin 9 = Ground
Do not connect the d-sub connectors to the RX10700 unless you are sure
the box is properly connected to the computer chassis and the power supply
zero.
The parallel port interface is an open drain, a 74HC03, and it may be
damaged by static electricity.
Repairing the RX10700 is trivial, but if the computer parallel
port is damaged, repair is not easy.
Making sure that ground is connected before the cable to a computer
parallel port is connected is always a good idea.
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Sensitivity
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Noise floor in 500 Hz bandwidth -140 dBm (NF = 7 dB).
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Gain
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+1 dB.
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Dynamic range
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1 dB compression point +18 dBm.
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Third-order
intermodulation
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Two signals at + 10 dBm produce third order intermodulation
below -40 dBm (IP3 > +35 dBm).
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Weight
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1.4 kg.
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Size
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48 mm x 218 mm x 350 mm.
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The RX10700 is inteded to be used together with the RX2500
and a modified Delta 44 soundcard.
Read about the Delta 44 soundcard modifications here.
System performance data for WSE RX10700 used with a
WSE RX2500 and a modified Delta 44
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Sensitivity
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System noise floor in 500 Hz bandwidth with the Delta 44
in minimum gain mode -132 dBm (NF = 15 dB).
System noise floor in 500 Hz bandwidth with the Delta 44
in maximum gain mode -136 dBm (NF = 11 dB).
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In-band dynamic range
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Level for A/D saturation -14 dBm.
Noise floor relative to near saturating carrier at 5 kHz frequency
separation with Delta 44 in minimum gain mode -146 dBc/Hz.
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Out-of-band dynamic range
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Level of interference that causes 3 dB loss of S/N for a weak signal
with Delta 44 in minimum gain mode.
Frequency Level
separation (dBHz)
50 162
70 166
100 171
200 173
400 181
Carrier above noise floor in 1 Hz bandwidth.
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The WSE RX10700 is designed by SM5BSZ, Leif. A detailed description is
available here:
details of the RX10700
Some general information about the WSE converters is available here:
WSE converters
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