That is impressive Peter. Do you have any details, spectrum plots, etc?
Carl
KM1H
----- Original Message -----
From: "Peter Frenning [OZ1PIF]" <peter@frenning.dk>
To: "jeremy-ca" <km1h@jeremy.mv.com>
Cc: "AMPS" <amps@contesting.com>; "Bill Fuqua" <wlfuqu00@uky.edu>
Sent: Friday, February 29, 2008 6:04 PM
Subject: Re: [Amps] Class-E Amplifiers
> 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@uky.edu>
>> To: "jeremy-ca" <km1h@jeremy.mv.com>; "AMPS" <amps@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@uky.edu>
>>>> To: "AMPS" <amps@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@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>>>
>>>
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>
> --
> Vy 73 de OZ1PIF/5Q2M, Peter
>
> ** CW: Who? Me? You must be joking!! **
> email: peter(no-spam-filler)@frenning.dk
> http://www.frenning.dk/oz1pif.htm
> Ph. +45 4619 3239
> Snailmail:
> Peter Frenning
> Ternevej 23
> DK-4130 Viby Sj.
> Denmark
> ***********************************
>
>
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