[Premium-Rx] WJ-8711A or WJ-8712P

[Michael O'Beirne]

Dear Karl-Arne

That's most interesting and thanks for sharing.

73s
Michael
G8MOB



Regarding the relative performance of the WJ-8711 compared to the 
Racal RA3701 and the RA3791, about 15 years ago,I came across an 
internal report compiled at the 
Swedish Ministry of Foreign Affairs in the mid 90's.

They commissioned the Swedish Defence Radio Establishment to compare 
these receivers as part of an upcoming procurement and replacement 
project, 
as the SRT CR91 recently had been discontinued and the SRT operations 
had gone bankrupt for the first 
time.
 
The findings were that the RA3701 and 3791 "ran circles" around the 
WJ-8711,especially with regard to reciprocal mixing and 2-nd order 
IP.

Also the IP3 of the WJ-8711 was considered to be inadequate in the 
light of the 
Northern European HF signal levels.

For reasons unknown, the MFA receiver procurement was postponed, and
the very new few receivers purchased for SDRE survelliance purposes 
became R&S or Deutsche Aerospace units, and the SRT units were
refurbished to prolong their service life. 

The MFA then bought the Rockwell/Collins Mediaware or Spectrum-2000 
system which turned out to be
an expensive but mediocre performer which in the end lead to the 
complete abolishment of the MFA HF operations.

73/
Karl-Arne
SM0AOM