[Amps] Question about SPE 1.3K-FA amplifier

Leigh Turner invertech at frontierisp.net.au
Mon Nov 9 16:33:50 EST 2015

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.


-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Jim Thomson
Sent: Monday, 9 November 2015 9:45 PM
To: amps at contesting.com
Subject: [Amps] Question about SPE 1.3K-FA amplifier

Date: Sun, 8 Nov 2015 06:59:35 -0700
From: Richard Solomon <dickw1ksz at gmail.com>
To: Amps group <amps at 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.


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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