[Amps] SPE 1.3K-FA and FTDX-5KMP / IMD at rated PEP

[Joe Subich, W4TV]

On 11/13/2015 4:50 PM, Leigh Turner wrote:
 >
> That sensible criteria Joe just about excludes all solid-sate
> commercial amps that are currently in the ham-market...rather sadly
> :-(

Which is a shame because the Quadra and PW-1 with 8 x MRF-150 *should*
*be* capable of -40 dB(PEP) at 800W output and -35 dB(PEP) at their
rated 1 KW output.  Given the age of those designs, it is amazing that
the new designs are so sloppy.

A pair of BLF-188A based amplifiers with splitter/combiner each running
800W PEP for 1600W PEP total should be able to make the -40 dB(PEP) as 
long as the designer takes care to keep the bias stable and avoid any
saturation of the output transformers.

I suspect, but have not seen the IMD curves, that the two of the old
EB-104 boards updated with VRF-2933 VFETs and new output transformers
could also make the grade (again 800 W(PEP) per board with transistors
capable of 2400W total saturated power).

73,

   ... Joe, W4TV


On 11/13/2015 4:50 PM, Leigh Turner wrote:
>
> That sensible criteria Joe just about excludes all solid-sate commercial
> amps that are currently in the ham-market...rather sadly :-(
>
> Leigh
> VK5KLT
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Joe Subich,
> W4TV
> Sent: Friday, 13 November 2015 8:06 AM
> To: amps at contesting.com
> Subject: Re: [Amps] SPE 1.3K-FA and FTDX-5KMP
>
> Given SPE's own IMD test results at 1 KW PEP - not even the rated
> 1300 W PEP Output - I would not drive an SPE 1.3K-FA with *any*
> transceiver.  If an amplifier can't make at least -30 dB relative
> to PEP at rated power it belongs in the garbage rather than making
> garbage on the air.
>
> 73,
>
>      ... Joe, W4TV
>
>
> On 11/12/2015 2:23 PM, Richard Solomon wrote:
>
>> What would folks think about running the FTDX-5KMP
>> in Class A to drive the SPE Amp ?
>>
>> 73, Dick, W1KSZ