[Boatanchors] AM linear question

Bry Carling bcarling at cfl.rr.com
Wed Dec 9 21:56:39 EST 2015


Yes, and in fact the majority of commercial broadcast transmitters nowadays use low level modulation fed to a linear amplifier.

Best regards - Brian Carling
 AF4K Crystal Co.
http://af4k.com

Tel: 321-262-5471




> On Dec 9, 2015, at 7:23 PM, WA5VGO <hbrnut at suddenlink.net> wrote:
> 
> I'm not saying it can't work. It can work well. The problem is, most commercial amplifiers don't have the cooling and power supply necessary to do the job, and there is a large group of guys out there that have no idea of what it takes to tune a linear amplifier for AM. The guy running the 811A's was driving it with a B&W 5100B running full tilt. These guys get a 50-100 watt AM rig, hang an SB-200 on the tail end of it, tune for maximum output and let it rip. 
> 
> Darrell
> 
>> On Dec 9, 2015, at 6:13 PM, Paul Baldock <paul at paulbaldock.com> wrote:
>> 
>> Correctly adjusted linear amplifiers and AM are an excellent combination and should be encouraged. Most of the modern 100W SSB rigs when set to AM will automatically limit the carrier to 25 watts, drive your typical well adjusted 10dB linear amplifier such as a pair of 3-500Zs and you have 250 watts of carrier with a potential for 1000+ watts PEP, and a nice clean signal.
>> 
>> With this combination we have 1000s of amateurs that can contribute and extend the life of Amplitude Modulation on the bands. If you are trying to limit AM to Vacuum Tube Rigs and High Level Modulation then AM operation will dwindle to even less than it is now.
>> 
>> - Paul  KW7Y
>> 
>> at 03:48 PM 12/9/2015, WA5VGO wrote:
>>> Generally speaking, linear amplifiers and AM are a bad combination.
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