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@contesting.com] On Behalf Of Joe Subich,
W4TV
Sent: Friday, 13 November 2015 8:06 AM
To: amps@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
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