Message-ID: <000b01c3b4fc$dc4e8ec0$6401a8c0@comcast.net>
From: "Jay Rusgrove" <JRusgrove@comcast.net>
To: rsgb_lf_group@blacksheep.org
References: <000001c3b4f7$5047f240$fce8c593@rsch15>
Date: Thu, 27 Nov 2003 10:41:01 -0500
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Subject: Re: LF: Impedancebridge
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Jim & group

If your selective level meter has a tracking generator output it can serve
as the signal generator (may need to be amplified a bit) as well as the
detector. I use an old General Radio 516 bridge (recommended by John
Andrews - tnx agn John) and an HP 3586C selective level meter with good
success. Makes for an interesting mix of old and new test equipment sitting
side by side!

Jay Rusgrove, W1VD

----- Original Message ----- 
From: "James Moritz" <J.R.Moritz@herts.ac.uk>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, November 27, 2003 10:01 AM
Subject: RE: LF: Impedancebridge


> Dear Peter, LF Group,
>
> >Hello LFers,
> >is the Gereral Radio 1656 covering our LF-Band?
>
> I am not certain, but I believe this is an audio-frequency bridge - if
> it does work at 136k, it is probably with reduced specification.
>
> >May be that any impedance bridge using as RF detector some selective
> level
> >meter (pegelmesser) can help you for this measure.
>
> Selective level meters work very nicely as RF bridge detectors - Since
> it is only null detection that is needed, a receiver with "S" meter or
> output meter would also work fine. All you have to do is make sure there
> is enough attenuation between the bridge and RX/level meter so that the
> local QRM does not overload the front end.
>
> Cheers, Jim Moritz
> 73 de M0BMU
>
>
>
>