Message-ID: <15c691384e7.marcocadeddu@tin.it>
Date: Fri, 2 Jun 2017 15:51:45 +0200 (CEST)
From: "marcocadeddu@tin.it" <marcocadeddu@tin.it>
To:  <rsgb_lf_group@blacksheep.org>
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Subject: R: Re: R: LF: Re: I: Fw: For today the FETs survived...
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Hello Chris,

yes I'm testing into a dummy load and getting troubles trepassing the 
15kmW (thousend of mW) limit!!!
I drive with a reasonable waveform both the qrp TX and 
medium power TX (and now the halfbridge tx) with an IXDD614 chip.

Will resist still in this microwaves area waiting that the oter folks 
go to DC ;-)))

CU Marco

----Messaggio originale----
Da: dead.fets@gmail.com
Data: 2-giu-2017 15.14
A: <rsgb_lf_group@blacksheep.org>
Ogg: Re: R: LF: Re: I: Fw: For today the FETs survived...

Hello Marco,

My  loading coil drifts as it warms up, but that's only when a kW or so
is  run,  not  at  low power. But I think you are testing into a dummy
load?   I  also had a poor drain waveform on one side of my push pull
Class  "D",  that  was  only cured by changing one of the 2 FET's (that
tested  fine  out  of circuit). We "microwavers" are old school now 
that
people are moving to DC toggled every hour or so ;)


Friday, June 2, 2017, 2:00:07 PM, you wrote:

> Hi Alan,

> and thanks for joining :-)
> it's hard to believe at this stage that is correct to speak of "high 
> currents"..
> The PA is an half bridge like 
> Andy's 700W but now I'm testing at low voltage: I see these problem 
> trepassing the 30Vdc supply level (and power is about 15W)..
> Anyway will try with the "pulse rated caps" you suggested just in 
case
> my "low current" "low tension" ideas are wrong.
> 73 Marco


-- 
Best regards,
 Chris                            mailto:dead_fets@gmail.com