[JMS] Testing Unknown Mechin

[JAMES HANLON]

Jeff,

The mechanical filters that I know of have center frequencies in the 200 to 500 kHz range.  I'd try connecting the sweep generator to one end and the scope to the other.  Make sure the scope can "see" the level of signal coming out of the sweep generator by itself.  Restrict the sweep range as much as possible, to a single, manually set frequency if at all possible, and see if you get any indication of output through the "filter" as you tune or sweep through the suspected range.  If you find a frequency or band of frequencies that pass through the filter, use the counter to determine what they are.

Jim, W8KGI
________________________________
From: james_millen_society-bounces at mailman.qth.net <james_millen_society-bounces at mailman.qth.net> on behalf of n2lxm at juno.com <n2lxm at juno.com>
Sent: Saturday, December 4, 2021 2:26 PM
To: boatanchors at mailman.qth.net <boatanchors at mailman.qth.net>; james_millen_society at mailman.qth.net <james_millen_society at mailman.qth.net>
Cc: milsurplus at mailman.qth.net <milsurplus at mailman.qth.net>
Subject: [JMS] Testing Unknown Mechin

Good Afternoon ALL,

        While digging through my storage aera for parts for a winter
project. I found what appears to be a small mechanical filter. The only
marking on it are 512453. What would be a good way to test it? Not
knowing the center frequency or bandwidth. As for equipment, I have a HP
8061A RF / sweep generator, Frequency counter, Oscilloscopes, and a LP
technologies, LPT-2250 150KHz - 10000 MHz Spectrum analyzer. Any
information would be helpful.



                                                    Jeff N2LXM
                                          Amateur Radio Operator
                                                      American
                                                        Patriot
                                     Proud Father of Two US Marines

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