[Lowfer] I need an Inverted keying circuit idea

[we0h at yahoo.com]

I would use a transistor to invert the keyline logic.

Not at home right now so I can't pull up a drawing to show you.

Mike
WE0H
------Original Message------
From: Andy - KU4XR
Sender: lowfer-bounces at mailman.qth.net
To: lowfer at mailman.qth.net
ReplyTo: Discussion of the Lowfer \(US, European, &UK\) and MedFer bands
Subject: [Lowfer] I need an Inverted keying circuit idea
Sent: Oct 4, 2009 2:47 PM

Hi all:

I found my erratic frequency problem. I was floating the Osc. Gnd.
and using the K1EL to key it to Gnd. This worked fine on the other 
Epson Osc. but not on this one for some reason. With Gnd's connected,
the Osc. runs continuously. I have 2 possibilities of keying.
The K1EL pulls to Gnd, So !! I either Make and Break the voltage
line on the Osc. which will require an external relay, I don't want
to go that route. Or, as Lyle pointed out in the article; an inverter
circuit is needed. I tried connecting a MC14049 HEX Buffer/Inverter
in the key line thru the protection resistor. I can get it to key
the XMTR, but it will not unkey. I am not a designer, will someone
tell me what I'm not doing right so I can get this thing keying again.
Thank you !! I appreciate your help.

73 :::


Andy - KU4XR - EM75xr - Friendsville, TN.
LOWfer Beacon " XR " @ 185.29855 KHz ( QRSS-60 )
Coordinates:  N:  35* 43' 54" - W:  84* 3' 16"
http://www.myspace.com/beaconxr


      

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