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Author Topic: Quartz crystal filter manufacturer?  (Read 2778 times)
KC2NLT
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Posts: 145




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« on: January 31, 2018, 11:21:32 AM »

Does anyone know of a good quartz crystal RF filter manufacturers?

I need a bandpass filter, something along the lines of a half lattice crystal filter, mainly due to its slope response which falls away quickly.
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AA4HA
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Posts: 2626




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« Reply #1 on: January 31, 2018, 11:44:14 AM »

Here are some possibilities;

http://bomarcrystal.com/inv_ordering.html
http://www.crystek.com/home/crystek/default.aspx

The biggie, International Crystals, went out of business about a year ago.
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Ms. Tisha Hayes, AA4HA
Lookout Mountain, Alabama
KC2NLT
Member

Posts: 145




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« Reply #2 on: January 31, 2018, 01:38:08 PM »

So one of those two would be able to custom build a bandpass filter for me?

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W1BR
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Posts: 4052




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« Reply #3 on: January 31, 2018, 02:11:21 PM »

A single custom filter would probably cost thousands.  PTI can probably build one.

http://www.mtronpti.com/



What frequency, BW, termination Z and slope factor do you need?  There are many sources for decent surplus crystal filters.

Most hams and some manufacturers have gravitated to ladder filters.  Easy to design, and they use single frequency uP crystals that sell for peanuts. Lattice filters aren't that common.


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G3RZP
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Posts: 834




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« Reply #4 on: February 01, 2018, 06:46:31 AM »

Depends on frequency, but you might find Inrad has something.

http://www.inrad.net/home.php
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AA4HA
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Posts: 2626




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« Reply #5 on: February 01, 2018, 10:54:10 AM »

Yea, if it's a standard IF frequency there is probably some off-the-shelf solutions that are already available.

You could even get something that has a half a dozen or so poles that has a terrific shape factor and set up for the input/output impedances you want.

I thought you were looking for raw crystals to make your own filter.

Tish
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Ms. Tisha Hayes, AA4HA
Lookout Mountain, Alabama
W1VT
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Posts: 2928




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« Reply #6 on: February 01, 2018, 01:51:53 PM »

Yes, contact a ham friendly company like Inrad and tell them as much as you are comfortable with about what  you want to do.
They may be willing to make a really good deal on something that is just sitting on the shelf.
I've also bought crystal filters at good prices at hamfests.

Zak W1VT
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N8YX
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Posts: 1274




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« Reply #7 on: February 02, 2018, 06:02:12 AM »

Quartslab (UK) is another possibility.
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G3RZP
Member

Posts: 834




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« Reply #8 on: February 02, 2018, 07:15:01 AM »

The recording that answers the Quartslab telephone requests you to leave a name and telephone number and they will call back. Interesting that they don't appear to have updated the website for some years, though. Their telephone number is +44 20 7100 6357. The email is sales2@quartslab.com and the website is http://quartslab.com/
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NE1U
Member

Posts: 90




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« Reply #9 on: February 03, 2018, 03:28:38 PM »

Maybe make sense to look for a compatible digital filter ... http://www.ab4oj.com/icom/dspfilter.html
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