[time-nuts] FS700 schematic

Ulrich Bangert df6jb at ulrich-bangert.de
Tue Nov 23 17:52:13 UTC 2010


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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> 
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