[Elecraft] Amp specs

[Joe Subich, W4TV]

 > could it be that 750 watts PEP is the same as 600 watts key down

After spending a lot of time looking at solid state amplifier
design the most likely reason for a 750 W PEP/600 W CW specification
is either cooling or power supply limitations.

In practice, if the power supply and cooling can support it, the
CW rating could actually be 1 dB or so higher than the PEP rating
simply since increased IMD is not a concern for CW/RTTY (single
tone applications).  One would normally set the PEP rating below
the 1 dB compression point for maximum linearity (e.g. AB1 in tube
parlance) while setting the CW rating somewhat higher (e.g., class
B or even class C in the tube world).

73,

    ... Joe, W4TV


On 5/26/2011 11:07 AM, riese-k3djc at juno.com wrote:
> could it be that 750 watts PEP is the same as 600 watts key down
>
> Hmmmm
>
> Bob K3DJC
> On Thu, 26 May 2011 06:50:48 -0500 "John Harper"<john at ae5x.com>  writes:
>> In looking at several HF amps, I notice that PEP and CW are usually
>> of different levels for a given amp.
>>
>> For example, THP's HL-1.2 is rated at 750w PEP, 600w CW. Granted, a
>> receiving station would not notice any difference in a 0.9 dB
>> increase of power on any mode but I'm wondering how the KPA500
>> compares - is the 500w rating PEP or CW?
>>
>> John AE5X
>> Radio: http://www.ae5x.com/blog
>>
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