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Re: Toshiba M57762 Power Module



Thanks Bob,

I was hoping that I may be able to get 20w (linear) out of the module with
the new MOSFET device.  That still may not be enough for Mode L with my loop
yagi.  I may have to dust off the 2C39 cavity amp.

Of course this all assumes Yaesu returns the missing parts.

Ken

----- Original Message ----- 
From: "Robert McGwier" <rwmcgwier@comcast.net>
To: "kgshutt" <kgshutt@cox.net>; <amsat-bb@AMSAT.Org>; "Jari Koivurinne"
<jari.koivurinne@virpi.net>
Sent: Sunday, November 02, 2003 11:22 AM
Subject: RE: [amsat-bb] Toshiba M57762 Power Module


> Down East Microwave has a fair supply of the M57762's,
> of course, you do need a circuit board to put it on ;-).
>
> Bob N4HY
>
>
> -----Original Message-----
> From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
> Behalf Of kgshutt
> Sent: Sunday, November 02, 2003 5:05 PM
> To: amsat-bb@AMSAT.Org; Jari Koivurinne
> Subject: Re: [amsat-bb] Toshiba M57762 Power Module
>
>
> Jari,
>
> Yaesu returned my 1.2 Ghz module, less the PA module, circuit board, relay
> and all other components in the PA enclosure.  I am still workin with them
> to return the missing parts.
>
> The new Mitsubishi RA18H1213G module appears attractive as a replacement.
> However, I have been unable to locate a data sheet.  RF parts has it
listed
> but doesn't have the data sheets on line.
>
> According to RF Parts, the efficiency of this module is 20% versus 30 to
40%
> for the M57762.  I am concerned about overloading the 736 switching power
> supply.
>
> Do you have any comments or suggestions on a source for the data sheets
for
> this part.
>
> 73 de Ken - K5GUU
> ----- Original Message -----
> From: "Jari Koivurinne" <jari.koivurinne@virpi.net>
> To: "kgshutt" <kgshutt@cox.net>
> Sent: Sunday, October 12, 2003 12:33 AM
> Subject: RE: [amsat-bb] Toshiba M57762 Power Module
>
>
> > > Hello Everyone,
> > >
> > > My 1.2 Ghz module for my FT-736 has apparently gone south.  Yaesu
> amateur
> > > repair service reccomends relpacement of the Toshiba M57762 Power
> > > Module at
> > > an estimated repair cost of $420.  Ouch!  I am considering replacing
the
> > > module myself.  Anyone have suggestions on a good source of these
> Toshiba
> > > modules?
> > >
> > > Regards,
> > >
> > > Ken - K5GUU
> > >
> > >
> >
> > Hello Ken!
> >
> > Ask RF PARTS. (www.rfpars.com) They have a MOSFET-replacement of M57762.
> > It is called RA18H1213G. Price is about 78.25. Note that this module
needs
> > only
> > 10mW of drive so a little attenuator somewhere is needed. The module is
> more
> > linear than the old M57762. You can get allmost 20W of linear power
> compared
> > to
> > 12W for M57762. (and not so linear!!)
> >
> > -Jari
> >
> >
>
> ----
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>
>
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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