Scott, If the UHF rig is going to be dedicated to this wervice, consider disabling the final, and jumpering the driver stage to the output network if possible. If you get a couple tenths of a watt it will be plenty, and won't bring your repeater's link side to the attention of others.
As mentioned in another thread recently, many solid state PA's make as much heat (or more!) when dialed back than they do at full power. My Alinco DR570T draws 9 amps at 45 watts out on 2m, but still draws 4 amps at 5 watts. Assuming about an amp runs everything but the PA, and 13.8 volt supply, that means I'm dissipating about 65 watts of heat on high power, but still putting about 36 watts into the heatsink at low power, despite dropping power output 9 dB. 73, Paul, AE4KR ----- Original Message ----- From: Scott Yeager To: Repeater-Builder@yahoogroups.com Sent: Thursday, July 02, 2009 6:51 PM Subject: Re: [Repeater-Builder] GM300 Crossband Ham repeater Bi-Directional The UHF Radio I have is rated at 25 watts according to RSS but I'd like to attempt turning the output power down to around 10 watts... .
