[Amps] Dedicated RF

[Roger (K8RI)]

On 7/29/2012 7:41 PM, Gary K9GS wrote:
> Well, my point is that I'd be happy to see some
> experimentation/development in SS amps, instead of another commercial
> amp using hideously expensive tubes.  Let's face it, the days of the
> 3CX800 are numbered.  Why introduce a commercial product with expensive
> and, potentially in the near future, hard to get tubes?  Other than a
> handful of ham radio amplifiers, is there any commercial application for
> 3CX800s other than replacement parts?

You should be able to purchase a pair of the Freescale devices for about 
half the price of one 3CX800A7. That's a max of 2400 watts. I'd think it 
could be derated to 1500 watts. But even then, could 4 of the devices 
derated by 50% to 2400 watts be practical.  I'd spend  a grand on them 
if I could both get a decent signal out of them and depend on them for 
160 through 10 or even 160 through six.  The protective circuitry is 
more complicated than the amp.
BUT put a simple microprocessor in there, sample the desired points and 
the coding would be simple, particularly in machine language.

I sure would like to see some IM figures for these devices.

Maybe I need to pick up some tested 8877 pulls.<:-))


73

Roger (K8RI)


>
> If you're going to introduce a tube amp at least pick some reasonably
> priced tubes.  The Alpha website lists a pair of 3CX800's at $2100.00.
> That's almost 1/3 of the selling cost of this amp.
>
>
> On 7/29/2012 3:50 PM, Carl wrote:
>> And just what SS devices would you suggest that will run 1500W CCS and still
>> give -40dB or better SSB IMD3 over 1.8-30MHz?
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message -----
>> From: "W2XJ"<w2xj at nyc.rr.com>
>> To:<amps at contesting.com>
>> Sent: Sunday, July 29, 2012 2:29 PM
>> Subject: Re: [Amps] Dedicated RF
>>
>>
>>> For all that and what it will cost, Solid State is a better way to go.
>>>
>>>
>>> On 7/29/12 2:25 PM, Dan Simmonds wrote:
>>>> Gary K9GS wrote:
>>>>> I agree with Rob....yet another 2x 3CX-800 amp.  Big deal.  What would
>>>>> be the point of buying one of these
>>>>> when I could buy an Alpha 87, TenTec, etc....
>>>>>
>>>>>
>>>> 20 kV (working limit) / 28 kV (test limit) vacuum caps
>>>> Custom-built edge-wound tank roller inductor (1/16" x 3/8" silver plated
>>>> Beryllium)
>>>> Toroidal HV transformer with 97% efficiency + or -
>>>> Remote display head
>>>> etc, etc
>>>>
>>>> Dan  KK3AN
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>