[Elecraft] KPA 500

[Joe Subich, W4TV]

 > Why hasn't anybody else designed a legal limit solid state amp?
 > 8 MRF-150's are about the same price as 2 Microsemi ARF-1500's
 > 50V high current DC supply vs 200V high current DC supply (in
 > the box).

8 MRF-150 will not do the job ... that's what is in the ALS-1300
and it's good for 1200 Watts.  Legal limit would take 12 MRF-150.

73,

    ... Joe, W4TV

On 2/5/2011 7:30 PM, R. Kevin Stover wrote:
> THP's amps are anything but primitive.
> Check me if I'm wrong but they are the only manufacturer producing a
> legal limit solid state amp. The THP 2.5KFX.
>
> Notice I said legal limit, not close to or in the neighborhood, or
> might make it if the wind blows just right, but legal limit.
>
> The design for that amp was hashed out on the pages of QEX.
>
> It is expensive but not Alpha 9500 expensive and it is one of a kind.
>
> Why hasn't anybody else designed a legal limit solid state amp?
> 8 MRF-150's are about the same price as 2 Microsemi ARF-1500's
> 50V high current DC supply vs 200V high current DC supply (in the box).
> Same stupid proof auto-protection systems all the other "not quite
> there" amps employ. Well, maybe not. I don't think any of the MFJ amps
> will auto band switch without buying their little add-on decoder.
>
> What was that about primitive?
>
>
>
> On Sun, 6 Feb 2011 07:58:06 +0800 (HKT)
> Johnny Siu<vr2xmc at yahoo.com.hk>  wrote:
>
>> Hello John,
>>
>> THP is a manufacturer for commercial equipment as well as per
>> their web site. I just don't know why their ham amplifiers are so
>> primitive.  They should have the technology and know how.  My past
>> experience with THP in HF is not promising. V/U linears are ok.
>>
>> I would always see linear + ATU as a package.  Therefore, THP + its
>> own dedicated ATU is not that cheap.  Of course, I shall see how
>> KPA500 + KAT500 come out.
>>
>>   cheers,
>>
>>
>> Johnny VR2XMC
>
>
>