DEMI 70CM Setup with Flex 6700

Mike Presnell

I am having difficulty getting my DEMI L432-28HP configured with my Flex 6700.  There has been "some" discussion in the past, but nothing complete posted in the forum.

Specifically,  what Transverter settings in the Flex Radio Setup?

Here is what I have (and don't have):
RF Freq (MHz):  432.000
IF Freq (MHz):  28.000
LO Freq (MHz):  404.000
LO Error (Hz):  ????
RX Only:  Disabled
Max Power (dbm):  ???
Rx Gain (dB): ???

Also curious about IF cable connections.  My unit has Common RF and Split IF.

For cabling:
DEMI PTT:  to  6700's RCA TX3  (PTT is working)
DEMI REF:  to 6700's 10MHz out (The DEMI Lock Blue Light is on....working).
DEMI IF:  to 6700's transverter port.
DEMI TX IF:   Not connected

Any help is greatly appreciated.  Thanks!

Mike Presnell

Sergey R5AU

WA2SQQ

Sergey R5AU

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

WA2SQQ

Surgey if the local oscillator in the transverter is slightly off fequency which they usually are, isn't the L O error actually correcting that? GPSDO is actually controlling the Flex radio not to transverter, right?

Sergey R5AU

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

WA2SQQ

Ok, but not all transverter s, right?

Sergey R5AU

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 )