K3 power creep

[Ron W3ZV]

My normal RTTY contest mode is S&P. I am using AFSK A mode. When I am
doing this with my K3 and FL-7000, I set my drive so I get about 300
watts out of the amp. On the rare occasion that I try to hold a
frequency long enough to run on it, I back off the power so that the amp
runs 250 watts. Not much difference, but I feel better about it. I
noticed during the CQ WPX that after each power change, the amp output
is lower than expected and creeps up during the first transmission. All
subsequent transmissions are where I want them and steady. Typically
when changing from 300 watts to 250, I would see 180 out on first
transmission, which would creep toward 250 during the transmission. This
is what show on my amp PO meter, so it is somewhat less than a precision
measurement.

I had been using FSK in the past ( and will again shortly) and don't
remember seeing this before. However, like my amp's PO meter, my memory
is not a precision instrument.

Is this normal, perhaps ALC related, or a problem.

Ron W3ZV


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[Joe Planisky]

Hi Ron,

I can't comment on whether this is normal or a problem, but I can  
confirm that I see the same thing in AFSK-A mode, so it's not just  
you :-) I believe it is ALC related.

73
--
Joe KB8AP



On Feb 15, 2009, at 1:25 PM, Ron W3ZV wrote:

> ...

> Typically
> when changing from 300 watts to 250, I would see 180 out on first
> transmission, which would creep toward 250 during the transmission.  
> This
> is what show on my amp PO meter, so it is somewhat less than a  
> precision
> measurement.
>
> ...
>
> Is this normal, perhaps ALC related, or a problem.
>
> Ron W3ZV

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[Henk PA5KT]

Same here.

Its only on AFSK-A, not on FSK D.

Henk PA5KT

Joe Planisky schreef:

> Hi Ron,
>
> I can't comment on whether this is normal or a problem, but I can  
> confirm that I see the same thing in AFSK-A mode, so it's not just  
> you :-) I believe it is ALC related.
>
> 73
> --
> Joe KB8AP
>
>
>
> On Feb 15, 2009, at 1:25 PM, Ron W3ZV wrote:
>
>  
>> ...
>>    
>
>  
>> Typically
>> when changing from 300 watts to 250, I would see 180 out on first
>> transmission, which would creep toward 250 during the transmission.  
>> This
>> is what show on my amp PO meter, so it is somewhat less than a  
>> precision
>> measurement.
>>
>> ...
>>
>> Is this normal, perhaps ALC related, or a problem.
>>
>> Ron W3ZV
>>    

--
Henk Remijn PA5KT
email: [hidden email]
www: www.remijn.net

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[Philip Leonard WVØT]

Same here, I have to keep an eye on it all the time.


Henk Remijn PA5KT wrote:

> Same here.
>
> Its only on AFSK-A, not on FSK D.
>
> Henk PA5KT
>
> Joe Planisky schreef:
>> Hi Ron,
>>
>> I can't comment on whether this is normal or a problem, but I can  
>> confirm that I see the same thing in AFSK-A mode, so it's not just  
>> you :-) I believe it is ALC related.
>>
>> 73
>> --
>> Joe KB8AP
>>
>>
>>
>> On Feb 15, 2009, at 1:25 PM, Ron W3ZV wrote:
>>
>>  
>>> ...
>>>    
>>  
>>> Typically
>>> when changing from 300 watts to 250, I would see 180 out on first
>>> transmission, which would creep toward 250 during the transmission.  
>>> This
>>> is what show on my amp PO meter, so it is somewhat less than a  
>>> precision
>>> measurement.
>>>
>>> ...
>>>
>>> Is this normal, perhaps ALC related, or a problem.
>>>
>>> Ron W3ZV
>>>    
>

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