Yes please do use a fan. I have seen that even though you reduce power you are correct that too low makes the radio unstable in many ways. Lower RF output does not mean lower current draw, it will drop to one point but then level out. The lower RF also does not mean less heat on the PA, maybe some but 50% less power does not mean 50% less heat.
But these radios are nice for links as long as the PA stays cool. Rich -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] Behalf Of Bruce Nanney Sent: Tuesday, July 12, 2005 2:17 PM To: [email protected] Subject: Re: [Repeater-Builder] GM300 power adjustment limit? I can tell you what I've came up with on mine and it might help. I have M120's as link transmitters, the boards are basically the same. If I turn my power down below 8 to 10 watts it starts acting up, spurs and changing power out each time you tx out. I keep my power set at 12 to 15 watts and seem to do fine. I mounted it and VHF radius 100 on top of 12 amp Astron. I have 5 of these units running in repeater system. Some of them have ran as long as 8 years with out being touched. When I did have problems it was power supply problems not radio problems. I also put 4" fan blowing across the fins. Hope this helps. Bruce KD4BOH. ----- Original Message ----- From: "Ken" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, July 12, 2005 9:17 AM Subject: [Repeater-Builder] GM300 power adjustment limit? >I have a 40 watt UHF GM300 I would like to tune down to 10 watts? Is > this a safe level to set to on the 40 watt units? I heard that if the > power level is set too low it will cause spurs? What is the lowest > power level I can set the amp to? > > Thanx for reading. > Ken > > > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
