[hpsdr] Phoenix - possible mixer and transformer possibities

[Glenn]

Dear all

Please evaluate the possible mixer and transformer possibities explored here:

http://www.xs4all.nl/~martein/pa3ake/hmode/conclusion.html
Quote: "...
Both the FSA3157 and the NC7SZ384 mixers did not suffer at all from 
the fact that the mixer is constructed from two to four separate 
devices rather then just one, with regard to IMD.
...
The best values are found on the bands where it is needed most namely 
80M and 40M. Those values are easily exceeding +46dBm making it very 
difficult to construct the surrounding subsystems (BPF and roofing 
filter) so that they don't compromise the mixer's IP3.
...
The category 6 mini-circuits transformers (ADTT1-6, ADT1-6T, TT1-6, 
T1-6T) turned out to be well worth investigating too. Although no 
winners in spur reduction, these transformers are the best if spurs 
are not the first concern. What these transformers have in common is 
that for an unexplained reason they almost completely eliminate the 
mixers bias point sensitivity.
..."


Main page:
http://www.xs4all.nl/~martein/pa3ake/hmode/
http://www.xs4all.nl/~martein/pa3ake/hmode/introduction.html


IP3 measurement
Signal Generators and Hybrid Combiner:
http://www.xs4all.nl/~martein/pa3ake/hmode/ip3measurements.html

kind regards,

Glenn/OZ1HFT