[time-nuts] FS700 schematic

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
> >> > > >>>
> >> > > >>>
> >> > > >>> _______________________________________________
> >> > > >>> time-nuts mailing list -- time-nuts at febo.com
> >> > > >>> To unsubscribe, go to 
> >> > > >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> >> > > >>> and follow the instructions there.
> >> > > >>>
> >> > > >>>
> >> > > >>
> >> > > >> _______________________________________________
> >> > > >> time-nuts mailing list -- time-nuts at febo.com
> >> > > >> To unsubscribe, go to 
> >> > > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> >> > > >> and follow the instructions there.
> >> > > >>
> >> > > >
> >> > > >
> >> > > _______________________________________________
> >> > > time-nuts mailing list -- time-nuts at febo.com
> >> > > To unsubscribe, go to 
> >> > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> >> > > and follow the instructions there.
> >> >
> >> >
> >> > _______________________________________________
> >> > time-nuts mailing list -- time-nuts at febo.com
> >> > To unsubscribe, go to 
> >> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> >> > and follow the instructions there.
> >>
> >>
> >> _______________________________________________
> >> time-nuts mailing list -- time-nuts at febo.com
> >> To unsubscribe, go to 
> >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> >> and follow the instructions there.
> >>
> >
> >
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to 
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.