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Re: bloody smd bits :P. help someone pls :)



I looked at the circuit and I doubt that it is a Gali-6 MMIC. The circuit
using the RF6Z is a transistor amplifier not a MMIC amplifier. It has
feedback to make it an amplifier with about 50 ohm impedance by looking at
the feedback resistors. Any transistor with a decent ft should work. DO NOT
put a GALI MMIC in it's place because it will not work. You can replace all
of the IF circuitry by a GALI, two caps, a resistor and a choke and it will
work but the circuit needs to be rewired.

Pieter N4IP


----- Original Message -----
From: "Scott Elliott" <scott@pieh0.co.uk>
To: <amsat-bb@AMSAT.Org>
Sent: Sunday, May 12, 2002 7:14 AM
Subject: Re: [amsat-bb] bloody smd bits :P. help someone pls :)


> thanks for everyones help, but after 4-5 days of searching the net almost
> constantly...
>
> ive found out what the hell that IF pre amp is.
>
> its  micro circuits Gali-6f in a SOT-89 package.
>
> not sure on the proper details, but im closer :).
>
> i shall let the board know when i find it, and where (hopefully) to get
it.
> i think GH engineering do it, just need to check.
>
> so with anyluck, anyone with deaf aidc 3731's, can replace them :).
>
> at times like this, i could almost kill the net :P
>
> thanks for all your help :)
> Speak to you later.
> Scott Elliott
> Scott@pieh0.co.uk
> 2E1FJB / M1SJE
> ----- Original Message -----
> From: "Scott Elliott" <scott@pieh0.co.uk>
> To: <amsat-bb@AMSAT.Org>
> Sent: Saturday, May 11, 2002 10:22 PM
> Subject: [amsat-bb] bloody smd bits :P. help someone pls :)
>
>
> > hi there,
> >
> > ive got one of the k5gna transystem aidc 3731 downconverters, and im
> looking
> > for the IF pre-amp smd, the chip has RF6Z on top.
> >
> > just wondering if anyone knows where to get them from, or knows what i
can
> > replace it with.
> >
> > it doesnt seem to like 35w of cw going into it.
> > lucky i wasnt using ssb, im sure that would have blown something else up
> :)
> >
> > thanks for ANY help on this, ive been looking for the past 3-4 days and
> the
> > net isnt being much help :/
> >
> > thanks again  :)
> >
> > Speak to you later.
> > Scott Elliott
> > Scott@pieh0.co.uk
> > 2E1FJB / M1SJE
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
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