The WSE RX2500 is a converter that converts 2 radio frequency signals to
audio signals that fit a four channel 96 kHz 24 bit sound card.
The input signals are centered at 2.5 MHz and the useful bandwidth is over 90 kHz. Together with a Delta44 sound card, WSE RX2500 provides the hardware for an SDR (software defined radio) receiver such as Linrad with a bandwidth of 93 kHz centered at 2.5 MHz.
The WSE RX2500 is intended for use together with other converters that bring radio frequencies of interest to 2.5MHz. Such converters are easily designed with standard technology, but to fully utilize the exceptional dynamic range of the RX2500 some non-standard solutions are required.
There are WSE converters that match the performance of the RX2500. These converters use crystal oscillators only to avoid noise floor degradation and therefore several converters are used to provide a wide frequency coverage with a limited number of crystals.
The WSE converters provide a receiver having a first intermediate frequency of 70 MHz. The WSE RX70 converts to 10.7 MHz and the WSE RX10700 converts from 10.7 to 2.5 MHz. The frequency coverage at 70 MHz is 0.5 MHz. Other converters convert from amateur bands to 70 MHz in 0.5 MHz wide segments. The output of these receivers is four audio channels that form two baseband signals that fit a four channel soundcard such as the Delta44.
The WSE RX2500 was sold in the years 2002 to 2010 in a quantity of about 50 units for a price of 4200 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 RX2500 technical data
The RX2500 fits to a Delta 44 soundcard. It is a good idea to make some modifications, the Delta 44 soundcard suffers from spurs and noise due to several inadequacies in the design. The sensitivity to ground loop currents can be eliminated and the flat noise floor can be improved by about 3 dB. Read more about the Delta 44 soundcard modifications here.
System performance data for WSE RX2500 used with a modified Delta 44
The WSE RX2500 is designed by SM5BSZ, Leif. A detailed description is available here: details of the RX2500
Some general information about the WSE converters is available here: the WSE converters