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Re: Preamp bypass circuit



You do not want to use the PTT from the back of the FT847 to start you
sequencer.  RF has traveled up to the preamp by this time and will kill it.
The only foolproof was to do this using the sequencer method is to start the
sequencer with a footpedal or other similar switch which first turns off the
preamp and then enables the PTT line of the rig.

Scott

Scott Olitsky
AC3A
Buffalo, NY
FN03pa

AC3A@arrl.net

144 MHz EME
4 x M2 9SSB
8877 PA by antennaworks
MHP - 145 preamp
----- Original Message -----
From: "Jon Ogden" <na9d@mindspring.com>
To: "David Rush" <ky0dr@earthlink.net>; <amsat-bb@AMSAT.Org>
Sent: Thursday, February 15, 2001 6:15 PM
Subject: Re: [amsat-bb] Preamp bypass circuit


> on 2/15/01 12:40 PM, David Rush at ky0dr@earthlink.net wrote:
>
> > A sequencer would be nice, but won't a typical one triggered off the
mic's
> > PTT cause the downconverter to be switched out of my 2m receive, even
when
> > I'm transmitting on 70cm?  I won't be able to hear my downlink.
>
> No, you use the PTT line out the back of the radio - the same used for
> keying the amplifiers.  There is a separate one for each band.
>
> 73,
>
> Jon
> NA9D
>
> -------------------------------------
> Jon Ogden
> NA9D (ex: KE9NA)
>
> Member:  ARRL, AMSAT, DXCC, NRA
>
> http://www.qsl.net/ke9na
>
> "A life lived in fear is a life half lived."
>
> ----
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>

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