A very limited number of these units were made about 200 unlike other models that were made in the 1000's

A experiment model to work with raising the usable frequency range of the SoftRocks to 30 MHz, it used a slightly different QSD detector that did help lower the noise level, but it used analog clock and quadrature generation with it's problems with phase noise. The reson being in order to keep the cost low 30 MHz would have required a 120 MHz clock in order to generate the quadrature using digital methods and would have entail use of different logic families and voltages.

Some of it's features were;

It functioned at 30 MHz although it had low sensitivity due to not having an pre-amp.
Analog Quadrature clock generation
Very limited run of 200 units.

Here is a directory with documentation on the Softrock models;

File directory