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Re: [TenTec] Replacement cw filter

To: tentec@contesting.com
Subject: Re: [TenTec] Replacement cw filter
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Reply-to: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 14 Dec 2010 10:52:20 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
At Mouser (www.mouser.com) and Digi-Key (www.digikey.com) you can buy 
microprocessor crystals for less than 50 cents each. You just have to 
buy a bunch and do your own matching which can take having a signal 
generator, which is possible to build from one of the crystals and a few 
parts and a frequency measuring scheme, like a counter. Details have 
been published several times, including books from MFJ and the ARRL book 
"Experimental Methods in RF Design" 
http://www.arrl.org/shop/Experimental-Methods-in-RF-Design/ which 
sometimes can be found at other stores for a better price.

73, Jerry, K0CQ

On 12/14/2010 10:13 AM, Neal Laugman wrote:
> Hi Marty,
> Of course there is the alternative to spend as much as the rig is
> worth:
> http://www.inrad.net/home.php?cat=95
> I have Inrad filters in several rigs, and I will probably get a filter
> like you are looking for to fit into my Triton IV, too.
> http://www.inrad.net/product.php?productid=207&cat=95&page=1
> Again, if price is an issue ($125) you can get some cheap-but-
> matched crystals from Dan's Small Parts and roll your own. The trick is
> having them matched.
> 10 MHZ HC18-U PACKAGE ..... 6/$6.00
> 4.000 MHZ HC18-U PACKAGE ..... 6/$6.00
> 9.600 MHZ HC18-U PACKAGE ..... 6/$6.00
> 8.000 MHZ HC18-U PACKAGE .... 6/$6.00
> http://www.danssmallpartsandkits.net/
> None of these are the right frequency (9000.5 - 9000.8), but if you look
> around the net you can probably find something. HTH.
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