[time-nuts] FS700 schematic

paul swed paulswedb at gmail.com
Fri Nov 26 16:26:57 UTC 2010


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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>> > > >>>
>> > > >>>
>> > > >>
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>> > > >
>> > > >
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