DEMI 70CM Setup with Flex 6700

Hi Mike ! I have DEMI L432-28HP as well and unit works successfully 


I have separate one for full duplex purpose in combination with other bands and 0dbm TX input level.  In my case  
DEMI IF TX - 6700 transverter port
DEMI IF - to RX A



In Radio setup you should enter RF Freq and IF Freq , RX Gain - just for compensation level of on PAN (Manual:  RX Gain (dB): this field is optional, but will correct the receive signal level reading in the Panadapter and Slice Receivers.) - you can adjust further to correct you zero noise level 





and in my case I use universal tools like screwdriver and soldering iron where
first one for tuning signals levels properly on DEMI side(TX (for TX power at 0 dbm output and max power on SSDR, and RX - to reach +10db increase of noise level on SSDR PAN after DEMI switch ON)   - access to variable resistors on the bottom side of the transverter)  however I was not satisfied with tuning and used "second tool" for changing attenuators resistors on DEMI PCB.
BTW I need to mentioned what my DEMI unit some time start like oscillator after switch to TX and I found very usual problem in schematic - in RX and in TX parts of transverter in use integrated voltage stabilizers like 7805 (see schematic diagram), I have modified with add before stabilizer any resistors (20-50 ohm) and all input and outputs of stabilizers was blocked with capacitors (0.01 )
all elements are SMD type.
For now works perfectly  and many contacts via SAT in full duplex mode

73!

Wayne you are right but in our case LO sync with GPSDO

No, Flex with GPSDO has output of 10mhz what synch LO (Apollo by N5AC) of transverter

In DEMI case this is an option (LO PLL with ext 10mhz), but in my setup any RX/TX unit are synch with GPSDO with that I am sure completely with “True” of indicated freq )