Is the Icom an EC model? If so you need to have at least a 5C plugged in to compensate it. Preferably a 2C on transmit. EC = External Compensation. 5C=5 ppm stability and 2C= 2 ppm.
You can also check the pins on the exciter board, they have a history of being cold soldered or breaking loose. As a matter of course, I'd resolder all of them while you are in there. Bill ________________________________ From: Stanley Stanukinos <ka5...@swbell.net> To: Repeater-Builder@yahoogroups.com Sent: Tue, August 3, 2010 8:06:53 PM Subject: RE: [Repeater-Builder] Re: Mastr II drift problem Next thing look at the comp voltage going to the tcxo it comes off of the 10v reg card. Have you checked or swapped it yet? From:Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of steve Sent: Tuesday, August 03, 2010 8:06 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Mastr II drift problem Hi Stan, Yes I sent the crystals to International. I have 3 fans running full time on the heat sink. Thanks for any help! Steve --- In Repeater-Builder@yahoogroups.com, "Stanley Stanukinos" <ka5...@...> wrote: > > Did you just buy the crystals and insert them in the ICOMs or did you send > them in to the crystal MFG to be compensated. If you did them yourself the > compensation is probably now messed up. The best way to fix it is to send > them in to the crystal MFG for compensation. > > > > Stan > > > > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of steve > Sent: Tuesday, August 03, 2010 5:33 PM > To: Repeater-Builder@yahoogroups.com > Subject: [Repeater-Builder] Mastr II drift problem > > > > > > 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 >
