[AMRadio] why i like am

Thu Dec 2 06:13:44 EST 2010

so you are saying that my Bird wattmeter and or rf amp meter should not 
increase?   agree that the Plate current should not change unless the wave 
form is not symetrical. Bernie.
----- Original Message ----- 
From: "Bob Macklin" <macklinbob at msn.com>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Thursday, December 02, 2010 1:09 AM
Subject: Re: [AMRadio] why i like am


>A plate modulated transmitter that is not exceeding 100% modulation will 
>not
> show a bouncing plate current or RF power.
>
> But a controlled carrier transmitter will.
>
> You have to understand the modulation method.
>
> Bob Macklin
> K5MYJ
> Seattle, Wa.
> "Real Radios Glow In The Dark"
> ----- Original Message ----- 
> From: "Jim in Waco WB5OXQ" <wb5oxq at grandecom.net>
> To: "Discussion of AM Radio in the Amateur Service"
> <amradio at mailman.qth.net>
> Sent: Wednesday, December 01, 2010 8:47 PM
> Subject: Re: [AMRadio] why i like am
>
>
>>I have a TS-2000 and it has both power and carrier settings.  Since I
>>cannot
>> use more than 12 watts of drive to limit output to 375 watts of carrier I
>> find this;
>> Setting the carrier to 100% and reducing the power to 12 causes the alc 
>> to
>> limit the output.  This seems to cause the wattmeter not to move much on
>> modulation peaks.  If I leave the power control set at max the alc drops
>> to
>> 0 on carrier but rises on  modulation peaks.  If I then set the carrier
>> control to allow 12 watts of carrier out the alc barely moves on
>> modulation
>> and the wattmeter moves a great deal with modulation.  I have not tried
>> airchecks though to see if others can hear the difference.  My service
>> monitor never registers more than 80% modulation with either setting.
>> WB5OXQ
>>
>> ----- Original Message ----- 
>> From: "Jay Bromley" <jayw5jay at cox.net>
>> To: "Discussion of AM Radio in the Amateur Service"
>> <amradio at mailman.qth.net>
>> Sent: Wednesday, December 01, 2010 10:31 PM
>> Subject: Re: [AMRadio] Was what is this???? now why i like am
>>
>>
>>> 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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>>
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>
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