[CQ-Contest] MFJ-434 Voice Keyer

Alexis Deniz yv5ssb at gmx.net
Mon Dec 26 07:54:41 EST 2005

With the N1MM works great in cw and ssb......

Alex www.yv5ssb.org.ve www.4m5dx.org www.yw5cq.org
----- Original Message ----- 
From: "K0HB " <k-zero-hb at earthlink.net>
To: "CQ-Contest" <CQ-Contest at contesting.com>; "MWA Reflector" 
<mn-wireless-assn at yahoogroups.com>
Sent: Sunday, December 25, 2005 12:54 PM
Subject: [CQ-Contest] MFJ-434 Voice Keyer

> 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?
> 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
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