WSE (Weak Signal Equipment) A joint effort by SM5BSZ Leif and SM7UFW Niklas.
(Dec 17 2011)
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

Input 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.
Output Two BNC connectors for two receive channels. Nominal impedance 50 ohms.
SWR < 1.5 for frequencies between 1.5 and 15 MHz.
Bandwidth 500 kHz at -3dB.
Supply 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
Computer interface 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.
Sensitivity Noise floor in 500 Hz bandwidth -140 dBm (NF = 7 dB).
Gain +1 dB.
Dynamic range 1 dB compression point +18 dBm.
Third-order intermodulation Two signals at + 10 dBm produce third order intermodulation below -40 dBm (IP3 > +35 dBm).
Weight 1.4 kg.
Size 48 mm   x   218 mm   x   350 mm.

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

Sensitivity 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).
In-band dynamic range 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.
Out-of-band dynamic range 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.

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