ITs a mix of bitx and the plessy BIDI from EMRFD.
I've used the plessy Bidi and its two transistors and works well at 9-17db (depends on how you
bypass the emitters) included is a picture of page 6.61 of EMRFD.
I built a 6M compact radio using that. With the devices selected it works to about 30mhz at 17db
and at 14db good to 50.? The voltage applied must not exceed 6-8V.
Its upside is good gain easily laid out, reproducable, and compact.? Downside not easily understood
unless standing on ones head for the other direction.? The TR lines must switch to voltages with no
drop.
Allison
