Many more had power adjustment, but just for CW, I.E. "Setting the drive
level" per se.
Collins S Line series, KWM-2, Yaesu FT-101 up to FT-One, etc. Most of the
1980/90's vintage were like that. Radios that permit overall output level
adjustment to include SSB didn't come out until sometime later.
Concur that there were lots of "mods" out there that taught folks how to
turn a good radio into an IMD Monster. The only thing that mattered was how
far the watt-meter deflected. No thought of the total products that caused
it to deflect. More is better. Spec An's were things only seen in labs.
Which brings up my 9000MP, that I was very upset to look at on the Anritsu
and then which also ties into the 15 dB gain discussion. Increasing the
gain increases the IMD. A no-brainer, but who would have thought that a
$15,000 radio would be anything other than perfect? Maybe just me I guess.
Mark Bitterlich
WA3JPY
----- Original Message -----
From: "MU 4CX250B" <4cx250b@miamioh.edu>
To: <jim@audiosystemsgroup.com>
Cc: <amps@contesting.com>
Sent: Tuesday, January 03, 2017 3:31 PM
Subject: Re: [Amps] FCC Denies Expert Linears' Request for Waiver of 15
dBRule
I remember that with the Drake C-Line, some ops would short the T4XC
ALC line, which would increase the power output to 175W. Most vacuum
tube transmitters I am familiar with did not have a power adjustment.
Even the mighty solid state Collins KWM-380 lacks a power adjustment.
73,
Jim w8zr
Sent from my iPhone
USING ALC to control drive level for a power amplifier is a CAUSE of
splatter and clicks. ALC should NEVER be used to set drive level. The
ONLY good reason for using ALC between rig and power amp is to protect
solid state output stages from damage due to a fault in the antenna
system.
Radios with slow-acting ALC are also famous for causing IMD blasts and
key clicks without even needing an amp, and there are many. But the most
usual way of producing lousy signals is by intentionally defeating the
ALC of the transceivers. In my environment they call it "liberating" the
radio, because the poor radio was tied down to just 100W by the evil
manufacturer, and by defeating that "brake" it can produce 150W or so,
when turning the mic gain to full and then screaming into the mike,
right?
I can't imagine what you are talking about. Since the days of separate TX
and RX, I don't remember ever seeing a rig that didn't allow adjustment
of output power.
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