[Amps] Class-E Amplifiers

[Peter Frenning [OZ1PIF]]

Carl
I'm using IRF510 on six (50MHz) to produce 500W in Class AB. Judged from 
my efforts to tame the beast, they should be able to switch fast enough 
to do Class E at least as high as that!

jeremy-ca skrev:
> I should have been more specific.
>
> When using power Mosfets of the IRF and similar cheapies numbers which is 
> what many hams appear to be using on MF and low HF.
>
> Carl
> KM1H
>
> ----- Original Message ----- 
> From: "Bill Fuqua" <wlfuqu00 at uky.edu>
> To: "jeremy-ca" <km1h at jeremy.mv.com>; "AMPS" <amps at contesting.com>
> Sent: Friday, February 29, 2008 3:57 PM
> Subject: Re: [Amps] Class-E Amplifiers
>
>
>   
>> No, they are making class-E amplifiers up in the microwave range now.
>> Naturally they don't have such high efficiencies as they have at HF 
>> frequencies.
>> But broadcast triodes in class-C have been able to get 80 to 90 percent 
>> plate efficiency.
>> 73
>> Bill wa4lav
>>
>>
>> At 03:28 PM 2/29/2008 -0500, jeremy-ca wrote:
>>     
>>> Arent Class E monoband amps and pretty much with a 7 MHz upper limit?
>>>
>>> At least that was what I was told by an active E builder who had a 400W 
>>> 75M
>>> AM amp inside about a 17 x 12 x 3 chassis minus the PS. I was impressed 
>>> but
>>> I still like the glow of my 250TH's and 304TL's ! Even tho it takes up a 
>>> lot
>>> of space and weighs a ton.
>>>
>>> Carl
>>> KM1H
>>>
>>> ----- Original Message -----
>>> From: "Bill Fuqua" <wlfuqu00 at uky.edu>
>>> To: "AMPS" <amps at contesting.com>
>>> Sent: Friday, February 29, 2008 10:12 AM
>>> Subject: [Amps] Class-E Amplifiers
>>>
>>>
>>>       
>>>>     Class E amplifiers have high efficiency but what about gain and 
>>>> drive
>>>> power. Some that I have see have about 10db gain but  unlike tube type
>>>> Grounded Grid amplifiers
>>>> I don't think any of the input power goes to the output. If so this 
>>>> would
>>>> reduce the overall  efficiency of a single stage amplifier  and driver 
>>>> if
>>>> the driver is not  Class-E.
>>>>
>>>> 73
>>>> Bill wa4lav
>>>>
>>>> _______________________________________________
>>>> Amps mailing list
>>>> Amps at contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>
>>>>         
>>     
>
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>
>   

-- 
Vy 73 de OZ1PIF/5Q2M, Peter
 
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