[time-nuts] FS700 schematic

paul swed paulswedb at gmail.com
Wed Nov 24 01:05:10 UTC 2010


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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