I just installed both the 500hz and 250hz Inrad filters and they are excellent.
$110 apiece but well worth it. jim N5KY
-----Original Message-----
From: Mel Bach <[EMAIL PROTECTED]>
To: [email protected]
Sent: Fri, 14 Oct 2005 10:28:40 -0400
Subject: [drakelist] R4C PTO
Has anyone had problems with instability of the cw note? Has anyone used the filters provided by INRAD for 500 cycle cw etc?
