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Re: [TenTec] Century 670 keyer manual / help

To: tentec@contesting.com, kc5qbc@swbell.net
Subject: Re: [TenTec] Century 670 keyer manual / help
From: Bwana Bob <wb2vuf@qsl.net>
Reply-to: wb2vuf@qsl.net, tentec@contesting.com
Date: Sun, 28 Nov 2004 22:16:08 -0500
List-post: <mailto:tentec@contesting.com>

I have a paper copy of the 670 data sheets. I can make a photocopy and mail it to you or I could scan it.

If power and output were interchanged, it may only blow Q4, the output transistor, a type MPS 6514. Probably any general purpose NPN transistor will work as a substitute. The output is an open collector NPN transistor, so it will not key negative voltages (i.e.: grid block keying) or high positive voltage (cathode keying).



Floyd Rodgers wrote:

Anyone have one in pdf or scan form? Otherwise, plain old copy will get converted to PDF, once I have it. Basic problem is what dies when the power and output leads get reversed? Thanks

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