Why is the forum repeating 1-2 day old messages?
Carl
----- Original Message -----
From: "jeremy-ca" <km1h@jeremy.mv.com>
To: "Peter Frenning [OZ1PIF]" <peter@frenning.dk>
Cc: "AMPS" <amps@contesting.com>; "Bill Fuqua" <wlfuqu00@uky.edu>
Sent: Saturday, March 01, 2008 8:56 AM
Subject: Re: [Amps] Class-E Amplifiers
> 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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