[AMRadio] Was what is this???? now why i like am

[Jay Bromley]

HI Rob,
On most rigs the "Power Control" sets the power for the final section, the 
carrier control controls the driver to those finals.  So if you set the 
Power Control on most Japanese rigs to say 20 watts ALC will be cutting in 
on you very quickly during modulation.  The carrier control on most rigs is 
harder to adjust, but you won't be hitting the ALC, if at all, if you leave 
the Power Control crank up and just set power level with with the "Carrier 
control".

For some reason it is very hard thing for the new AM guys and also new ops 
using digital modes like PSK31.

Many times the carrier control is an afterthought like in the TS-940.  I 
also hate that in Icom ads they rate AM power for their 100 watt rigs at 40 
watts, instead of the more proper 20-25 watts.

73 de jay/w5jay..

-----Original Message----- 
From: Rob Atkinson
Sent: Wednesday, December 01, 2010 6:57 AM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Was what is this???? now why i like am

Jay, maybe because I got up 15 minutes ago but I don't know what you
mean.  I have a FT1000MP and there is a "power" pot on the front panel
which I think somehow adjusts PA collector current and as far as I
know, that's it.  What's the carrier control?  Maybe a control found
on older JA rigs with tube PAs?

Jim in Waco, what is your exciter and amp?  I use the exciter to drive
a pair of 3-500zgs.  they are g.g. cathode driven so they need more
drive.  There are limits due to plate dissipation and B+ (2800 v.) but
20 w. drive gets 300 w. out, which is about my maximum for my amp.
the ricebox has a 200 w. PA so 20 w. modulated does not get any ALC
reduction.  If your exciter is 100 w. maximum you probably want to
stay at around 12 w. if you make long transmissions.  at 20 w. the
heat sink on my rig gets pretty warm after a while--the 200 w. spec is
for SSB.
I use a SB610 monitor scope and an old Tek 438.  These old scopes are
cheap at hamfests--actually the 610 cost more than the real
oscilloscopes hi hi.  You can turn a scope into a trapezoid monitor.
I'm sure we all can tell you how to do it if you want to know.   if
you get an old heath monitor scope replace the caps in the h.v. CRT
supply.

73

rob
K5UJ


On Wed, Dec 1, 2010 at 3:53 AM, Jay Bromley <jayw5jay at cox.net> wrote:
> You will get better performance using the carrier control for adjusting
> power.  Leave the power control wide open so when you modulate you will 
> have
> plenty headroom.
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