Dave,
Back in the day I DID repair Motorola VHF amps that had that very problem!
--
73,
-de John NI0K in rural Debs, MN USA
https://www.qrz.com/db/NI0K
Artek Manuals wrote on 7/13/2021 3:52 PM:
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@telus.net wrote:
Date: Mon, 12 Jul 2021 01:40:49 -0700
From: Jim Brown <jim@audiosystemsgroup.com>
To: amps@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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