Steve. Make sure you check the jumpers, if you switch the cards.
Butch, KE7FEL/r On Wed, Aug 4, 2010 at 6:11 AM, steve <[email protected]> wrote: > > > > 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]<Repeater-Builder%40yahoogroups.com>, > 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 > > > > >
