[Amps] power limiting in 8410 amps?

[Steve Bookout]

Hello Jim,

I have several of them and it's all about the same.

Plus/minus on different bands, but quite similar.

I've had several people suggest it's because the screen voltage is only 
200 volts.

73 de Steve, NR4M

On 11/3/2018 1:40 PM, Jim Thomson wrote:
> Date: Thu, 1 Nov 2018 19:32:58 -0400
> From: Steve Bookout <steve at nr4m.com>
> To: Amps at contesting.com
> Subject: [Amps] power limiting in 8410 amps?
>
>
> <I ask because, I have 4 of these amps in my M/M contest station and I've
> <always noticed that the higher the power out, the more input it takes to
> <get there.?? They tune up real nice and easy to about 1200 to 1300
> <watts, with about 40 watts of drive, but to get to 1500 seemed to be a
> <challenge.? Seemed like the gain would fall off, maybe taking twice as
> <much power to get the last 200 watts.
>
> <I know there is no real difference in the effect of
> <the power out, but I would rather get 1500 watts out @ 45 watts of
> <drive, than 65-70 watts of drive.
>
>
>
> <73 de Steve, NR4M
>
> ##  whoa, if the  8410  requires just 40 watts for  1200-1300 w
> but  75-80 watts  to get 1500w, something is amiss... as in the
> 8410 isnt linear under those conditions.. not even close. Are
> you sure whatever watt meter you are using to measure drive
> power is  dead on..ditto with output wattmeter  ?
> The gain is falling off..and fast, when driven harder.
> Its almost like you have entered the gain compression region.   A  2 tone
> imd test  would show the effect right away.
>
> Your gain dropped from  14.95 db...down to  12.87 db.   That’s a 2.08  db drop.
>
> ##  Does it do this on all bands ?
>
> Jim   VE7RF
>
>
>
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