When the tubes get weak it becomes an issue. On a 1000 watt transmitter I have seen the power output needle swing between 80% and 100%, This would be 200 watts of AM. Of course that is after 21 months of non-stop FM (CW) service. Kinda like a stupid trucker with a 100W linear, that will get into your car radio's audio even when it is off.
When the tube is fresh the power output will not move at all. Also the ageing can depend slightly on whether the output is tetrode or triode and if it is a new or remanufactured tube. Also remeber that a floating pin on an op-amp will make one of the damn nicest broadband AM radios you ever did see, just connect the power supply to an earth ground. On 2/13/07, Ken Arck <[EMAIL PROTECTED]> wrote: > At 12:31 PM 2/13/2007, you wrote: > > >"A transmitter can be transmitting a FM carrier with a significant > >amount of incidental AM. > > <---I didn't think there'd be enough incidental AM in a commercial > broadcast xmtr to be a factor here but I guess I'm wrong. Thanks > > Ken > ------------------------------------------------------------------------------ > President and CTO - Arcom Communications > Makers of the world famous RC210 Repeater Controller and accessories. > http://www.arcomcontrollers.com/ > Authorized Dealers for Kenwood and Telewave and > we offer complete repeater packages! > AH6LE/R - IRLP Node 3000 > http://www.irlp.net > > >
