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 Post subject: How to tell if you broke a crystal filter.
PostPosted: Oct Fri 18, 2019 7:54 pm 
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Location: Boston, MA
I was installing a crystal SSB filter into my Icom ic765 and dropped the filter from a height of about four feet onto a concrete floor.
SxxT I yelled. $98 dollars down the drain.
I installed the filter and it seems to be working as expected.

How easy or hard is it to damage a crystal filter? Is it a go, no go, situation where it would either work or not work if it got damaged?


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 Post subject: Re: How to tell if you broke a crystal filter.
PostPosted: Oct Fri 18, 2019 9:51 pm 
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Crystal filters typically consist of some number of crystal sections connected in series to create the desired bandpass characteristic. Obviously the fact that it still works is a very good sign. The concern would be that if the fall caused a microscopic crack in structure of one of the crystals, it may work for a while before it fails. Only way to know is to run it and find out.

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 Post subject: Re: How to tell if you broke a crystal filter.
PostPosted: Oct Mon 21, 2019 2:38 am 
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Greetings to morseguy and the Forum:

I pretty much agree with Chris. If you have an accurate curve of the specified filter response, you could use a spectrum analyzer / tracking generator to check the response curve and see if it has deviated from the norm. Otherwise, as Chris said, if has the selectivity that you need and has not adversely affected the receiver gain, then you probably got away with it.

Best of Luck,

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 Post subject: Re: How to tell if you broke a crystal filter.
PostPosted: Oct Mon 21, 2019 2:13 pm 
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Joined: Jan Sat 12, 2008 12:25 am
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Location: Kingwood, Texas
If it’s working, you’re okay. These things are much more rugged than you might think. I’ve seen them with dents in the case and they still work fine.


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 Post subject: Re: How to tell if you broke a crystal filter.
PostPosted: Oct Wed 23, 2019 2:08 pm 
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On the other hand, many early mechanical fliters would have been destroyed by a similar drop.

Pete

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 Post subject: Re: How to tell if you broke a crystal filter.
PostPosted: Oct Wed 23, 2019 2:19 pm 
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Joined: Jan Sat 12, 2008 12:25 am
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Peter Bertini wrote:
On the other hand, many early mechanical fliters would have been destroyed by a similar drop.

Pete


Very true.


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 Post subject: Re: How to tell if you broke a crystal filter.
PostPosted: Nov Tue 05, 2019 6:56 pm 
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Location: Boston, MA
I think it's okay.
Thanks for the suggestions.


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