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From: "Dave G3WCB" <ganymede444@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
Date: Sun, 22 Jul 2007 15:48:40 +0100
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Subject: LF: RE: Re: SPM-3 - deaf?
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Thank you for that tip, Walter.

I will give it a try.

73, Dave G3WCB IO91RM

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Walter Staubach
Sent: 20 July 2007 14:23
To: rsgb_lf_group@blacksheep.org
Subject: LF: Re: SPM-3 - deaf?


Dear Dave,
        the SPM-3 handles symmetric ( bottom and middle port ) and
assymetrical signals ( bottom or middle port and upper port, which is
ground. ) If you take an ohmmeter you will not find a connection between
ground and bottom or middle port, but between bottom and middle port
something like 50Ohm. Hope this was the reason and the equipment is ok.
73   Walter   DJ2LF / DI2AG

-----Urspr�ngliche Nachricht-----
Von: Dave G3WCB <ganymede444@btopenworld.com>
An: rsgb_lf_group@blacksheep.org <rsgb_lf_group@blacksheep.org>
Datum: Freitag, 20. Juli 2007 00:35
Betreff: LF: SPM-3 - deaf?


>
>Dear LFers,
>
>I have just acquired a Wandel & Golterman SPM-3, but it seems a bit deaf.
>The wide-band setting works OK, but the "Selective" channel can't be
>calibrated, and is 15 dB low in gain. Looks like a popped front-end or a
>damaged input circuit. I've opened up the case, but all the innards are in
>screened metal boxes.
>
>Is this a common fault with this unit, and does anyone have experience of
>this fault? (and managed to fix it!)
>
>73, Dave G3WCB IO91RM
>
>
>