[time-nuts] FS700 schematic

[Ulrich Bangert]

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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