What home page???
Carl
----- 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: Saturday, March 01, 2008 11:16 AM
Subject: Re: [Amps] Class-E Amplifiers
> No spectrum plots or IMD figures, unfortunately. Lots of detailed
> information (enough for reproduction anyway) on my homepage.
> Several thousand QSOs under the belt with it and no complaints heard, so
> nothing obvious is wrong with its output or linearity.
>
> jeremy-ca skrev:
>> 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
>>> ***********************************
>>>
>>>
>>
>>
>
> --
> 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
> ***********************************
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|