[time-nuts] FS700 schematic
Ulrich Bangert
df6jb at ulrich-bangert.de
Sat Nov 27 09:13:13 UTC 2010
Paul,
I am currently in a terrible hurry with my job. Must return to the FS700
later. Currently it runs completely ok on the W3DZZ with 102 dB receiver
gain and 31 dB noise margin. I have connected the output of my Z3805 to the
FS700's comparator input and the display says that ther is a delta-f of
1.9E-13 measured over a period of 117 hours.
Best regards
Ulrich
> -----Ursprungliche Nachricht-----
> Von: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von paul swed
> Gesendet: Freitag, 26. November 2010 17:27
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] FS700 schematic
>
>
> did you have any luck?
>
> On Tue, Nov 23, 2010 at 8:05 PM, paul swed
> <paulswedb at gmail.com> wrote:
>
> > Not a problem on spelling especially if tired.
> > The problem you are running into is really curious indeed. Since we
> > have no LORAN C in N A anymore. I can only use the loran
> simulator to
> > drive the FS700 and that works very well. I have the
> antenuator in the
> > simulator at -55 db as I recall to simulate the signal I
> used to get
> > from the 9960 chain. Literally have no problem at all as
> you have run
> > into. I did put the eproms on the K04bb site for safe
> keeping. Maybe
> > software vintage? Regards
> >
> >
> > On Tue, Nov 23, 2010 at 12:52 PM, Ulrich Bangert
> > <df6jb at ulrich-bangert.de>wrote:
> >
> >> This: sours should of course read: source
> >>
> >> > -----Ursprungliche Nachricht-----
> >> > Von: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com]
> >> > Im Auftrag von Ulrich Bangert
> >> > Gesendet: Dienstag, 23. November 2010 18:32
> >> > An: 'Discussion of precise time and frequency measurement'
> >> > Betreff: Re: [time-nuts] FS700 schematic
> >> >
> >> >
> >> > Hi Paul,
> >> >
> >> > > If you are using something different then an active
> antennathat
> >> > > draws current. You need a 470 ohm resistor to ground at the
> >> > > antenna bnc.The system sense current being drawn both high and
> >> > > low.
> >> >
> >> > Yes, this is understood. My "antenna coupler" for the W3
> includes a
> >> > 560 Ohm resistor and Frank has found out that even a 1 K
> resistor
> >> > is "accepted" as a functioning active antenna. My active
> loop draws
> >> > some 8 mA from the center conductor and is therefore
> accepted as a
> >> > functioning active antenna too.
> >> >
> >> > If the mysterious action has taken place it seems indeed
> as if the
> >> > the receiver gain is set to a very low if not zero
> value. This is
> >> > well understood because SRS says: If the <1 dB condition
> is met the
> >> > receiver stops action, so setting the gain to zero or so
> may be a
> >> > natural result of this. The big question is: What has happened
> >> > before that makes the receiver THINK that this condition is met?
> >> > Franks and mine receiver doing literally the same seems
> to indicate
> >> > that the sours is the same for both of them.
> >> >
> >> > Best regards
> >> > Ulrich Bangert
> >> >
> >> > > -----Ursprungliche Nachricht-----
> >> > > Von: time-nuts-bounces at febo.com
> >> > > [mailto:time-nuts-bounces at febo.com] Im Auftrag von paul swed
> >> > > Gesendet: Montag, 22. November 2010 23:34
> >> > > An: Discussion of precise time and frequency measurement
> >> > > Betreff: Re: [time-nuts] FS700 schematic
> >> > >
> >> > >
> >> > > Looked at the schematics front end is simple.
> Essentially op amps
> >> > > notch filters and most important electronic selectable
> >> > > attenuators. Any of it could cause issues. But the
> good news is a
> >> > > amplified loran signal is on the back of the unit so you could
> >> > > look to see whats happening to the signal. Oh other
> big point. If
> >> > > you are using something different then an active antennathat
> >> > > draws current. You need a 470 ohm resistor to ground at the
> >> > > antenna bnc.The system sense current being drawn both high and
> >> > > low. Regards Paul.
> >> > >
> >> > > On Mon, Nov 22, 2010 at 1:46 PM, paul swed
> <paulswedb at gmail.com>
> >> > > wrote:
> >> > >
> >> > > > My thats a reasonable answer indeed.
> >> > > >
> >> > > >
> >> > > > On Mon, Nov 22, 2010 at 12:24 PM, Stan, W1LE
> >> > <stanw1le at verizon.net>
> >> > > > wrote:
> >> > > >
> >> > > >> It is not just one page. What are you specifically
> >> > looking for ?
> >> > > >> Most sheets are B size ( double A size).
> >> > > >>
> >> > > >> I got the complete manual from SRS for ~35$
> >> > > >>
> >> > > >> Stan, W1LE
> >> > > >>
> >> > > >>
> >> > > >>
> >> > > >> On 11/22/2010 10:00 AM, Ulrich Bangert wrote:
> >> > > >>
> >> > > >>> Gentlemen,
> >> > > >>>
> >> > > >>> I know this one has been asked a few years before
> but I give
> >> > > >>> it another
> >> > > >>> try:
> >> > > >>>
> >> > > >>> Has anyone of you a Stanford Research FS700 schematic
> >> > > available that
> >> > > >>> he can share with me?
> >> > > >>>
> >> > > >>> Best regards
> >> > > >>>
> >> > > >>> Ulrich Bangert
> >> > > >>> www.ulrich-bangert.de
> >> > > >>> Ortholzer Weg 1
> >> > > >>> 27243 Gross Ippener
> >> > > >>>
> >> > > >>>
> >> > > >>> _______________________________________________
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