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Author Topic: Passive Bandpass Filter For "Poor Man's Spectrum Analyzer"  (Read 2307 times)
VA6AWR
Member

Posts: 23




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« on: November 13, 2012, 11:37:43 AM »

I purchased a Poor Man's Spectrum Analyzer kit from
Science Workshop in 2011.

I finally found the time to put it together but discovered that
one of the 10.7 Mhz passive bandpass filters is missing from the
main board kit.

I tried contacting Bruce Barlowe at Science Workshop to see if he
could supply me with the missing part but it appears he may
have gone out of business as he isn't responding to my
attempts to contact him.

The part in question looks like a disc capacitor in colour, size
and shape.  I thought it was a capacitor until I saw the third
lead.

Can anyone suggest where I might be able to buy the missing
part?

73,



Wayne
VA6AWR
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KE3WD
Member

Posts: 5694




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« Reply #1 on: November 13, 2012, 12:19:02 PM »

Very common part used in many FM receivers, you are looking for a "10.7MHz Ceramic Filter". 

Murata makes these, likely stocked by Digikey, Mouser, etc. as well as the first one up on a websearch here: 

http://www.grumpyshop.net/index.php?main_page=product_info&products_id=277

Don't spend more than about a dollar for one. 

And you can likely find a free one inside any old transistor FM radio...


73
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VA6AWR
Member

Posts: 23




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« Reply #2 on: November 13, 2012, 02:57:55 PM »

I really appreciate the information.

73,



Wayne
VA6AWR
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W2AEW
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Posts: 638


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« Reply #3 on: November 14, 2012, 06:30:18 PM »

I recently tore apart an old cordless phone, and there were several of them in there.
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