[BC] getting the right tube combinations

[DHultsman5@aol.com]

In a message dated 8/6/2006 8:18:58 AM Central Daylight Time,  
woollard at inreach.com writes:

>From  a sales point of view, Broadcast transmitters do not present a huge 
market  that would inspire futuristic design trends.
Modern Transmitter designs  move slowly in order to keep up with the 
technical abilities of the  service industry.
Wayne Woollard



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Transmitters are a very small part of the entire electronics  industry.
 
I think today the reason transmitters move slower is that there are no new  
components coming along for the development.  We have had solid state AM  for 
30 years now and we have evolved from series type modulated devices at 50  Volt 
up to 300 VDC digital switched devices.
 
In FM we are still playing around with the same 48 volt mosfets for 10  
years.  Manufacturers have all been making transmitters by paralleling the  400 
Watt 48 V MOSFET's all the way to 40 kW.   Lots of junctions and  combiner loss.
 
All the manufacturers are waiting for a new device that would make better  
power witha single device and still be able to be attached to the lightning  
rod.  It would be nice to have a 200 Volt or higher MOSFET for  VHF.
 
Dave