CQ-Contest
[Top] [All Lists]

Re: [CQ-Contest] MFJ-434 Voice Keyer

To: K0HB <k-zero-hb@earthlink.net>
Subject: Re: [CQ-Contest] MFJ-434 Voice Keyer
From: "Kenneth E. Harker" <kenharker@kenharker.com>
Date: Mon, 26 Dec 2005 08:14:04 -0800
List-post: <mailto:cq-contest@contesting.com>
On Sun, Dec 25, 2005 at 04:54:13PM +0000, K0HB  wrote:
> Santa left me a new MFJ-434 voice keyer to help with contesting vocals.  
> 
> Has anyone here used that with CT or other software, and built the interface 
> shown in the MFJ literature?

Here's one idea:
http://www.qsl.net/ae0q/contest/dvk_trlog.htm

> MFJ shows two resistors on each 'input' wire --- a 470-ohm at the computer 
> end of the wire and a 1K in series with that on the circuit board at the gate 
> of the switch transistor.  What's the point of separating these series 
> transistors?  It requires hiding a glob of 470-ohm resistors inside the Dsub 
> at the computer end of the cable.  Why not just put single 1.5K resistor on 
> the circuit board?
> 
> 73, de Hans, K0HB
> --
> ><{{{{*> http://www.home.earthlink.net/~k0hb 
> _______________________________________________
> CQ-Contest mailing list
> CQ-Contest@contesting.com
> http://lists.contesting.com/mailman/listinfo/cq-contest

-- 
Kenneth E. Harker WM5R
kenharker@kenharker.com
http://www.kenharker.com/

_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest

<Prev in Thread] Current Thread [Next in Thread>