[Boatanchors] [Hallicrafters] Hallicrafters TO Keyer modification - Using it witha straight key

[Duane Fischer, W8DBF]

Good stuff Greg! Thank you sir.

----- Original Message ----- 
From: "Greg Mijal" <bluebirdtele at embarqmail.com>
To: <Hallicrafters at mailman.qth.net>
Cc: <boatanchors at mailman.qth.net>
Sent: Sunday, October 24, 2010 12:14 PM
Subject: [Hallicrafters] Hallicrafters TO Keyer modification - Using it 
witha straight key


> Hi:
>
> Here's a good modification that allows the Hallicrafters HA-1 (TO Keyer) 
> to be used with a staight key.  Hallicrafters did not build the TO keyer 
> to use a staight key but I have a mod that will allow the user to run a 
> staight key or bug thru the keyer with side tone and mercury relay action 
> intact.
>
> At V4A pin 2 (grid) of the 12AU7 attach a 47 k ohm resistor.  The free end 
> of the resistor goes to the first terminal of the straight key.  The other 
> terminal of the straight key goes to chassis ground of the keyer chassis. 
> I ran a length of RG 174 thru the phone jack at the rear to the key to 
> complete the modification.
> The mod works great and you do not loose the electronic keyer action 
> either.
> 73's
> Greg
> WA7LYO
> Kinston NC
>
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