[1000mp] Re: Mark V Field Power Output IMD Specs

[Rob Atkinson, K5UJ]

thanks to everyone who wrote with the mk V imd spec info.
Also, thanks to the knowledgable fellow (I apologize for not remembering
your name) who
wrote to explain the higher power class A seeming paradox.  I apologize for
doubting the other
person (hans?). increasing power to reduce heat is a foreign concept to me.

rob/k5uj

----- Original Message -----
From: "Joe Subich, K4IK " <k4ik at arrl.net>
To: "'All about Yaesu 1000mp'" <1000mp at mailman.qth.net>; <k5uj at mc.net>
Sent: Friday, August 06, 2004 7:56 PM
Subject: RE: [1000mp] Re: Mark V Field Power Output IMD Specs


>
>
> > The data on the components and configuration of the Field PA
> > is interesting.  Does anyone have similar information for the
> > Mk V?  I am not at home right now and I have not had mine
> > very long.  I'd be interested in finding out the type and
> > number of PA transistors, optimum power for each one with
> > regard to low IMD ... the sort of data that's been given here
> > for the Field just now.
>
> The FT-1000MP/MKV uses a pair of Phillips BLF-147 FETs rated
> at 150 watts each.
>
> The complete datasheet is:
>       http://www.platan.ru/pdf/1dist/philips/BLF147_3.pdf
>
> In class AB, third order products are less than -40 dB from
> approximately 50 Watts to 115 Watts per transistor (100 to
> 230 Watts for the pair) and remain less that -35 dB to 145
> Watts per transistor.  Fifth order products remain below
> -35 dB through 180 Watts per device with a minimum of -42 dB
> at 120 to 140 Watts.
>
> In summary, at rated output the MKV has approximately 6dB
> less IMD than the Field when the Field is operated as designed
> and up to 10 dB lower IMD than a Field operated at 150 Watts!
>
>
> 73,
>
>    ... Joe, K4IK
>
>
>
>
>
>