[time-nuts] RE: phase locking Rb to GPS

Magnus Danielson cfmd at bredband.net
Sun Sep 18 18:10:12 EDT 2005

From: "Brooks Shera" <ebs at starband.net>
Subject: Re: [time-nuts] RE: phase locking Rb to GPS
Date: Sun, 18 Sep 2005 15:11:48 -0600
Message-ID: <004101c5bc95$a10167a0$0200a8c0 at EBS8500>

> Magnus is correct that many Rb's have a voltage
> input EFC control.  But in case yours needs a
> current source, the note below, which is an
> excerpt from some notes on how the drive an
> Efratom FRK-L from a gps controller, might be a
> start.
> The FRK-L has one end of the C-coil grounded and
> the other fed by a resistor network.  The resistor
> Rc mentioned below is the piece of the network
> that connects to the C-coil.

In the R&S XSRM Rb-standard (which I have), the 0 - 10V input goes straight
into the resistor network and coil setup as you described. The range is 1E-9.
Pretty much as your FRK-L modification, but this one is standard issue and
comes with a BNC in the back, as you would prefer.

PS. Anyone got the manuals for the frequency-converter XSRM-Z and the phase-
comparator XSRM-Z3? I would enjoy having them. Have the XSRM RB-standard and
XSRM-Z PSU manuals with schematics.


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