[Amps] KPA1500 Efficiency vs. RF-Kit B26

[Artek Manuals]

Yep ....same here with my KPA1500 though I rarely see temps over 70C (Im 
not as good a contester as K9YC) . 25000 QSO's in the first two years of 
ownership...I put the Alpha 9500 in the cabinet as a spare and it has 
never seen the light of days since ..

The fault level according to the manual is 112C

Back in the good old days at Bipolar days at Motorola 2-Way we had PA 
decks get hot enough the reflow the solder on the PA transistors on the 
ceramic substrate...8^)

Dave
NR1DX


On 7/13/2021 3:25 PM, jim.thom jim.thom at telus.net wrote:
> Date: Mon, 12 Jul 2021 01:40:49 -0700
> From: Jim Brown <jim at audiosystemsgroup.com>
> To: amps at contesting.com
> Subject: Re: [Amps] KPA1500 Efficiency vs. RF-Kit B26
>
>
>
>
> <When I'm contesting on HF, always at 1.5kW, I've seen temps at 90 C, the
> <fans run faster, I'm happy, and the amp is happy.
> <73, Jim K9YC
>
> ## 90 deg C ? wtf?
> 90 deg C = 194 deg F !
>
> ## Are u sure abt this ? That's stupid hor for a LDMOS device. What is
> the ambient temp in the shack when this is going on ?
>
> Jim VE7RF
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-- 
Dave Manuals at ArtekManuals.com www.ArtekManuals.com


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