[Elecraft] Checking crystal filters, [K3]

[Mike Scott]

I received a bad 6 KHz filter and it was replaced immediately upon my
discovery. In my case the upper and lower sidebands had significantly
different pass band characteristics so it was easy to tell by ear and then
measured with "Spectrogram" software on my PC.

I have a 500 Hz filter and would not know how to test it for IMD. I don't
have the test equipment to support the test. Does someone know of something
simple that can be done to check roofing filters?

Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
K3-100 #508/ KX1  #1311


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Date: Wed, 18 Jun 2008 15:16:19 -0400
From: Jerry Flanders <jeflanders at comcast.net>
Subject: Re: [Elecraft] RSGB RadCom K3 review posted on RSGB Members
	web page
To: "Eric Swartz - WA6HHQ, Elecraft" <eric at elecraft.com>
Cc: elecraft at mailman.qth.net
Message-ID: <6.2.5.6.1.20080618150501.060fa3c8 at comcast.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 02:44 PM 6/18/2008, Eric Swartz - WA6HHQ, Elecraft wrote:
>Looks like he clearly had a bad 500 Hz filter. It does not match our 
>measurements here or Sherwood's.  We'll make sure the customer gets 
>a replacement.

Just curious - do you guys check filters before shipping them? Most 
of us out here wouldn't have a clue if we had a bad filter - we would 
just suffer with poor performance without ever knowing why.

Jerry W4UK