The type of tube has no bearing on the harmonics and almost nobody builds PP
these days unless its SS.
Im sure any well designed Pi or Pi-L and anything else that is self
contained to help suppress harmonics would meet specs. Its expensive to get
certification and maybe K1FO doesnt want to go thru that so lists as
"export" .....that doesnt mean anyone in the USA cant get one.
I havent read the rules recently so maybe with the 10M ban lifted other
specs were relaxed??
Carl
KM1H
----- Original Message -----
From: "Roger (sub1)" <sub1@rogerhalstead.com>
To: "Carl" <km1h@jeremy.mv.com>
Cc: <amps@contesting.com>
Sent: Friday, November 19, 2010 5:23 AM
Subject: Re: [Amps] 3CX1000A7
> On 11/17/2010 6:49 PM, Carl wrote:
>> Harmonic and spurious attenuation rules are stricter there. Easy to meet
>> with a stub or LPF.
> True, but if you look at the tank circuit running a pair isn't is about
> the same as Palstar uses.
> Alpha uses a 4CX1500B for the legal limit out with a conventional pin net,
> or Pi-L.
> There are a number of 2-meter amps including the 2002A that *suggest*
> stubs or a network on the output.
> It appears the Palstar 2-meter amp uses a pair of tubes in the same type
> of circuit the 2002A uses although they use the Russian Tetrode (4CX-800)
> instead of the 3CX800.
>
> I don't see anything in the circuit compared to other legal limit 6-meter
> amps that would keep it from certification unless it'd be the tubes
> themselves.
>
> 73
>
> Roger (K8RI).
>>
>> Carl
>> KM1H
>>
>>
>>
>>
>> ----- Original Message ----- From: "Roger (sub1)"
>> <sub1@rogerhalstead.com>
>> To: "Carl" <km1h@jeremy.mv.com>
>> Cc: <amps@contesting.com>
>> Sent: Wednesday, November 17, 2010 1:30 PM
>> Subject: Re: [Amps] 3CX1000A7
>>
>>
>>> On 11/16/2010 9:37 PM, Carl wrote:
>>>> Because it doesnt meet FCC specs
>>> In what way? Just never approved yet?
>>>
>>> 73
>>>
>>> Roger (K8RI)
>>>>
>>>> Carl
>>>> KM1H
>>>
>>
>>
>
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