[1000mp] AMP Question

[Garry Shapiro]

Win et al:

Point of order, Mr. Chairman...

A steady carrier conveys no information. Morse code is one way to 
implement the more general On/Off Keying (OOK), which adds information 
to the carrier and is the simplest form of modulation. The idea that 
modulation must involve tones is simply wrong.

As for input impedance, the input Z of a cathode-driven GG stage varies 
considerably between no drive and driven, and with the type of tube and 
how it is operated. The variation in impedance can be ameliorated or 
buffered by swamping the input or by the use of an LC tank between 
driver and tube. In the latter case, the energy storage in the tank 
provides the buffering. The driver's antenna tuner constitutes an LC tank.

Garry, NI6T

Win wrote:
> You are right, Tom.  Modulation is the adding of information to an 
> existing carrier.
>
> Win
>
>
> ----- Original Message ----- From: "Tom Childers, N5GE" <n5ge at n5ge.com>
> To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
> Sent: Friday, May 04, 2007 9:35 AM
> Subject: Re: [1000mp] AMP Question
>
>
> On Thu, 3 May 2007 22:28:51 -0500, you wrote:
>
> There is no modulation in a CW carrier.  It is pure RF.  Modulation is 
> applied
> to a carrier to transmit varying pitch so speech can be transmitted.  
> Only MCW
> is modulated.
>
>
>> Not to draw this out, but I have to wonder if this is true in CW mode.
>> Modulation is either 100% or nothing.  It would seem that the input Z 
>> would
>> remain the same and not cycle the tuner.  Am I off base?
>>
>> Win, WoLZ
>>
>>
>>
>> ----- Original Message ----- From: "Garry Shapiro" <garry at ni6t.com>
>> To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
>> Sent: Thursday, May 03, 2007 8:05 PM
>> Subject: Re: [1000mp] AMP Question
>>
>>
>>> The impedance is nonlinear--and so voltage and current do not have a
>>> constant relationship.
>>>
>>> Rob Atkinson wrote:
>>>> Hi,
>>>>
>>>> I guess I don't understand how the Z of a load can change with the 
>>>> power
>>>> delivered to it unless the components affecting the Z are underated 
>>>> for
>>>> the power.   maybe i'm missing something?  sorry.
>>>>
>>>> 73
>>>>
>>>> rob / k5uj
>>>>
>>>>
>>>> On Thursday, May 3, 2007, at 10:09  AM, Rod Elliott wrote:
>>>>
>>>>> Dick...
>>>>>
>>>>> I use a Mk5 Field to drive an AL-1200. No problems... works great.
>>>>>
>>>>> In my experience the SWR presented to the Field by the amp's input is
>>>>> always well below 2:1, even if the output of the amp is not perfectly
>>>>> matched. The Field has no problem with that.
>>>>>
>>>>> One precaution... do NOT use the Field's internal antenna tuner when
>>>>> driving the amp. (The amp's input impedance varies with drive 
>>>>> level...
>>>>> you don't want the Field's tuner to strip its gears trying to follow
>>>>> your voice! )
>>>>>
>>>>> 73
>>>>> Rod VE3UW
>>>>>
>>>>
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>>
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> Tom, N5GE
>
> http://www.n5ge.com
> http://www.eQSL.cc/Member.cfm?N5GE
>
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