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Date: Sun, 31 Jan 2010 23:43:07 +0100
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1ACF@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: LF: 2nd try of sending the pic of my loop preamp with the BF862
Thread-Index: Acqifxe5KwR5yT3JThSSyDrSdJp8sAARAHpI
References: <12077821.1264946261487.JavaMail.root@wamui-cynical.atl.sa.earthlink.net>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
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Subject: AW: LF: 2nd try of sending the pic of my loop preamp with the BF862
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


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Hello Chris,=20
=20
I am not a communication engineer (but a power electronic engineer ;-) ),=
 so rather an amateur in this field. So my answer is kept simple ;-)
=20
In the datasheet of this cable i just found that attenuation is less than=
 150dB/km, so abt 3dB for my 20m cable. I have tried a cable of 2m (for in=
door tests) and changed the cable to 20m. The difference (e.g. of DCF39 in=
 the Argo monitor) is less than one S unit.
=20
In the moment i use a SFH350V (photo transistor)as the receiver. But recen=
tly i read in the web that a photodiode has (significant) less noise. So=
 i want to try a SFH250V in a next step to reduce the overall noise, proba=
bly in combination with a second BF862 in the input stage of the RX. The=
 SFH250V has even much better switching times. I have already ordered some=
 of those. I will try this and send the circuit here...
=20
The cable i use has a PE shielding which is not suitable to exist 10s of=
 years in the summer sun. But the distributor told me, it will be no probl=
em for some years. And since LF is a living project, this is enough for me=
.
=20
The losses of the cable must be compensated by a gain of an amplifier with=
in the system. This gain is not reached without a noise (e.g. by a OPA) bu=
t this noise can be much smaller than the noise that you fed into a sensit=
ive RX antenna, i expect. But the main aspect is, that one doesn't have to=
 worry any more if it could be possible that a noise is fed from the PC/RX=
/house to the preamp by the cable.
=20
73s, Stefan/DK7FC
=20
=20

________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von Chris Trask
Gesendet: So 31.01.2010 14:57
An: rsgb_lf_group@blacksheep.org; rsgb_lf_group@blacksheep.org
Betreff: Re: LF: 2nd try of sending the pic of my loop preamp with the BF8=
62



>
> Some OMs informed me, that the picture of the loop preamp is
> in a strange design. That may be come, since i (have to) use
> outlook exchange (?)
>
> Now i try to do it again. Those who asked for the picture,
> please give my a short confirmation if the picture is in the
> correct format now.
>
> I do some modifications to the RX in the moment and will send
> the new and perhaps better circuit soon. But the setup is
> already working vy fine!
>

     That is a very interesting approach to minimizing induced noise on th=
e RX cable.  What are the loss characteristics of the optical link, includ=
ing the diode(s)?


Chris Trask
N7ZWY
WDX3HLB
Senior Member IEEE
http://www.home.earthlink.net/~christrask/



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