DEMI 70 CM TRANSVERTER PROBLEM

  • 1
  • Problem
  • Updated 9 months ago
  • Solved
First let me say I already have one of the transverters from Ukraine for 2m and have no problems in either TX or RX with my FLEX 6300.  Have had it for about 6 months.   Just received a brand new, waited for 6 months, DEMI L432-28 70cm transverter.  And, I have no RX signal and no indication of TX signal.  The panadapter is showing nothing with a very faint reading below -120.  However, the rig does key up when I go into TX and I am getting about 15 watts out on the meter but no indication of modulation on the panadapter.   I have set up the DEMI with a  RF Freq of 440.000, which it was customized to do, a Max Power of 0.0 dbm, also customized for that power rating, and a RX Gain of 20.0db.  I have tried increasing the RX gain to 40.0db with no effect.  I must be doing something wrong which is very simple.  I use the same dual band vertical for the 2m Ukraine transverter with pretty good results.  What am I missing?
Photo of Mark Gottlieb

Mark Gottlieb

  • 99 Posts
  • 3 Reply Likes

Posted 1 year ago

  • 1
Photo of Mark Gottlieb

Mark Gottlieb

  • 99 Posts
  • 3 Reply Likes
Official Response
Better late than never...the problem originated, and was solved, through the FLEX XVTR settings.  I had 412.0 as the LO setting and it should have been 404.0 mHz.  Also, I had the dbm setting at 0.0 dbm and it should have been 15dbm.  Once those two settings were adjusted, everything has been working fine since.   The DEMI is a nice piece of engineering.  I am routinely hitting repeaters about 40 miles away with an antenna in the attic and only a 25 watt output.