EMRFD Message Archive 11019
Message Date From Subject 11019 2015-04-29 08:58:32 winston376 Current Source(s) for High Q Crystals In doing research on a custom design crystal filter a couple years ago, finding a manufacturer that could cut custom crystals with high Q (greater than 200,000 at 10.7 MHz) was challenging. ICM was the only provider that could get close to these specs.
If anyone could provide some current sources/manufacturer for custom cut high Q crystals, it would be much appreciated.
Thanks in advance.
Alex
11020 2015-04-29 09:21:16 bobtbobbo Re: Current Source(s) for High Q Crystals JAN Crystals in Florida can do all that if they are still in business. In years past they were my go-to crystal manufacturer.
Bob, K1AO11021 2015-04-29 10:11:09 Garey Barrell Re: Current Source(s) for High Q Crystals Not any more.
73, Garey - K4OAH11022 2015-04-29 10:41:18 Dana Myers Re: Current Source(s) for High Q Crystals 11023 2015-04-29 11:38:33 Garey Barrell Re: Current Source(s) for High Q Crystals Dunno... Saw a 'news item' somewhere that said they had closed up. Perhaps a 'future'? Closing.
73, Garey - K4OAH11024 2015-04-29 13:12:45 Lasse Moell Re: Current Source(s) for High Q Crystals Quarztechnik in Daun Germany should be able to help!
http://www.quarztechnik.com/contact.html
They produced the roofing filter crystals for the PA3AKE receiver... average of Q > 130 000
http://martein.home.xs4all.nl/pa3ake/hmode/roofer_ssb.html
/Lasse SM5GLC29 april 2015, winston376@yahoo.com [emrfd]
skrev: In doing research on a custom design crystal filter a couple years ago, finding a manufacturer that could cut custom crystals with high Q (greater than 200,000 at 10.7 MHz) was challenging. ICM was the only provider that could get close to these specs.
If anyone could provide some current sources/manufacturer for custom cut high Q crystals, it would be much appreciated.
Thanks in advance.
Alex
11026 2015-04-29 19:58:11 Ashhar Farhan Re: Current Source(s) for High Q Crystals Andhra Elec was a defence contractor to the local defense industry (joke, joke). they sell in small quantities too. shipping may be slightly painful. but they do deliver quickly and they are inexpensive. i have used them before. the only catch is that they are a little old fashioned. you have to write to them, probably talk over the phone. but they can deliver the crystals you need.- f11045 2015-05-01 08:52:02 winston376 Re: Current Source(s) for High Q Crystals Ashhar,
I looked at the Andhra website.
My primary parameter for selecting a custom crystal source is the quartz Q (> 200,000).
Once I drilled down and asked for hard test data on crystal Q, many of the sources that I contacted, were unable to provide or otherwise substantiate their claims with this regard.
Do you know or do you have experience with this source when it comes to delivering a high Q crystal?
Alex11055 2015-05-01 21:57:58 Ashhar Farhan Re: Current Source(s) for High Q Crystals Alex,I never got around measuring the Q of those crystals. We mostly used them for local VHF handies' crystals. The guy we contacted was sastry@andhraelec.com. They delivered in a week's time. Charging around Rs.150 (three dollars) per crystal. I have some lying with me. I will run a sweep and get back to you? Let's take this offline from the group.- f