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
-----Ursprüngliche Nachricht-----
Von: Dave G3WCB <[email protected]>
An: [email protected] <[email protected]>
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
>
>
>
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