I am using a PLL exciter with a 5C Icom. I am going to check the 10 volt supply. I have a couple of 10 volt cards that I will swap out if needed.
Thank you Steve --- In [email protected], Mike Morris <wa6...@...> wrote: > > At 03:33 PM 08/03/10, you wrote: > >Hello all, > > > >I have having a severe drift problem on my GE Mastr II 2 meter > >repeater. The transmit freq will drift nearly 2 KHZ over a 5-10 > >minute period. I have changed exciters and used a different ICOM but > >no improvement. The building that I am in is not ventilated and is > >very very hot. I put a high/low thermometer in and one day the high > >temp in the building was 114 degrees. Is this the problem? > > > >Thanks for any help. > > > >Steve W4SEF > > Can you elaborate on the situation? > Is it an FM exciter or a phase mod exciter? > Is it an EC, a 5C, or 2C Icom? > > Have you read <http://www.repeater-builder.com/ge/m2icoms.html> > especially the paragraph that starts with "Any voltage change on the > +10vDC power supply line will change the frequency on the Icom..." ?? > > You will also what to read the page at > <http://www.repeater-builder.com/tech-info/temperature-compensation.html>. > > An idea on cooled down a building before you set the frequency... > I once took a couple of cheapie box fans and setting one to blow > in (at floor level) and the second stacked above it to blow out (at > the top of the door level), and with a piece of cardboard in between > them as an air dam. The cardboard was cut from the side of a large > cardboard box that was used to ship a washing machine (ask for one > at any appliance store). > > You could do something similar for the time period needed > to set the frequency - your target is 75 to 80 degrees F for > about an hour. > > Look at page 5 of this: > <http://www.repeater-builder.com/ge/lbi-library/lbi-38505a.pdf> > Yes, it's a receiver LBI, and you have a drifting transmitter, > but the temperature notes apply. > > Mike WA6ILQ >
