[Amps] FCC Denies Expert Linears' Request for Waiver of 15 dBRule

[Mark Bitterlich]

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 at miamioh.edu>
To: <jim at audiosystemsgroup.com>
Cc: <amps at 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.
>>>