LF: Re: Re: Re: Siemens D2006 Selective Level Meter/Pegelmesser...and W&G SPM-3

["Tracey Gardner" <tracey.gardner@ntlworld.com>]

Hello Jan-Martin

The SPM-3 has a single xtal filter at the 650kHz 1st IF followed by a narrow
LC filter at the 1.5kHz 2nd IF.
The 1.5kHz filter is something like 100/120Hz wide at -6db.

73s Tracey

SPM-3 is another interesting unit, but I believe the selectivity
is based on LC-filters, and it really is too broad. Have kept a few for
possible
interest for 136kc activity in Norway.