Hi Jim,
I fully concur with all of your points below.
Someone would have to have lost all of their good sense to even consider
buying an amplifier without a complete set of detailed schematic diagrams
and associated Parts List. It is the ultimate insult to their customers and
the epitome of arrogance for a manufacturer not to do so.
To be considerate of other band users, one would have to operate the 1.3K-FA
"linear" amplifier with considerable Po back-off below the amp's rated 1300
Watts PEP that's well clear of its 1 dB power compression point and
saturated Po to yield any half-decent / semi-respectable IMD figures.
Leigh
VK5KLT
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Jim Thomson
Sent: Monday, 9 November 2015 9:45 PM
To: amps@contesting.com
Subject: [Amps] Question about SPE 1.3K-FA amplifier
Date: Sun, 8 Nov 2015 06:59:35 -0700
From: Richard Solomon <dickw1ksz@gmail.com>
To: Amps group <amps@contesting.com>
Subject: Re: [Amps] Question about SPE 1.3K-FA amplifier
Here is a link to what looks like the Test Report for
FCC Type Acceptance.
https://fccid.io/pdf.php?id=2443307
Curious as to what folks think about the results.
## This is almost as good as an arrl report for basic stuff.
Their test method seems a bit flawed imo. You can't test
any linear amp, by stuffing a 2 tone signal into the mic jack.
Unless the xcvr is running in class A. In this case, the icom 7800
used for the test, afaik, does not run class A.
## If SPE cant / doesn't want to provide a schematic for this amp,
or any of their other amps, I would not touch it, or buy one.
## at least they provide imd info for imd3 to imd11.
## The imd test is further flawed.... since they only ran the test at 1000
w pep out. The harmonic test was run at 1300w out. They are also stated in
db below pep, and not db below one tone. So u have to subtract 6 db from
all their tables. IE: their IMD3 on 7.150 mhz is a lousy -27.6 db. (and a
lousy -24.8 db on 160m and also 10m). Again, re-run the test at 1300w pep
out, and imd results will be a helluva lot worse.
## They need to re-run the test, this time using TWO xcvrs, each feeding a
cxr into a hybrid etc, then into the input of the amp.....and do it with the
amp running 1.3 kw pep out.
Jim VE7RF
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