Hi Wade,
Nice drawings. I would suggest a 47K resistor from the transistor base to
ground. I have had several occasions where the input to the base floated
(neither pulled high or to ground) and it caused the transistor to operate
erratically.
73, Tony VE3DWI
Subject: Re: [Repeater-Builder
Excellent undeniably accurate point Sean!
-Original Message-
From: Sean Fitzharris [mailto:[EMAIL PROTECTED]
Sent: Thursday, December 02, 2004 4:32 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Inverting COS
There is where the problem lies... your his
There is where the problem lies... your his elmer on this list.
I guess your down 20 points.
-Sean
On Thu, 2 Dec 2004, Neal Newman wrote:
Hey as an Elmer I teach my students electronic theory.
His Elmer apparently has NOT. shame on Him minus -20 Elmer for him.
Jeff Otterson
Hey as an Elmer I teach my students electronic theory.
His Elmer apparently has NOT. shame on Him minus -20 Elmer for him.
Jeff Otterson wrote:
Neal Newman:
You should be ashamed of yourself.
Minus 10 Elmer points.
Jeff
At 11:44 PM 11/30/2004, you wrote:
Sorry I cannot
]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, November 30, 2004 9:56 PM
Subject: RE: [Repeater-Builder] Inverting COS
Just like you, I've now failed to resist voicing my wish that you'd been
successful at resisting your comments.
How very rude! How about showing a little support
Here you go... You can even connect them together and we can end up right
where we started. ;-)
- Original Message -
From: Neal Newman [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, December 02, 2004 5:29 PM
Subject: Re: [Repeater-Builder] Inverting COS
Well
A 2N3904 transistor and a couple of resistors.
Of course, part of this depends on the circuitry as supplied.
Neil
jay_kruckenberg wrote:
I have a Motorola radio that has an active low COS signal. I need
this to be an active high COS signal. Does anybody know how to build
a
Replce it with a GE ! Seriously,build a one transistor inverter,NPN with
a 10 k pull up resistor. They naturally invert...
jay_kruckenberg wrote:
I have a Motorola radio that has an active low COS signal. I need
this to be an active high COS signal. Does anybody know how to build
a simple
Sorry I cannot resist this one..
And you call yourself a Ham?
My wife the Novice could answer that question.
Basic Transistor theory..
even an op-amp inverter
Her reply isIf he does not know how to invert the signal
he should not be building a repeater...!
Next question...
I bought a bag of 2N6426 Darlington Pair transistors some time back. These
work nicely for COS pick off because they do not load the existing circuit
very much.
Say you have a point that goes between 1/2 volt and 5 volts for a cor
source, (it will take around 1.4 V to turn on a dp cause of
At 08:00 PM 11/30/04, you wrote:
I have a Motorola radio that has an active low COS signal. I need
this to be an active high COS signal. Does anybody know how to build
a simple circuit that will invert the COS signal from a low to a
high signal?
Thanks
J
What controller do you have that can't
30, 2004 8:45 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Inverting COS
Sorry I cannot resist this one..
And you call yourself a Ham?
My wife the Novice could answer that question.
Basic Transistor theory..
even an op-amp inverter
Her reply isIf he does
...and if transistors are too hi tech, just use a relay!
Just in case you were confused by the terms active low and active high,
active low means to ground when active, and active high means to positive
power source when active.
John
- Original Message -
From: jay_kruckenberg [EMAIL
Here ya go:
http://www.repeater-builder.com/pix/cosswitch.gif
Kevin
jay_kruckenberg wrote:
I have a Motorola radio that has an active low COS signal. I need
this to be an active high COS signal. Does anybody know how to build
a simple circuit that will invert the COS signal from a low to a
Notice that his email username is groucho. I guess there is a reason for
that.
- Original Message -
From: Eric Brownell [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, November 30, 2004 9:56 PM
Subject: RE: [Repeater-Builder] Inverting COS
Just like you
Neal Newman:
You should be ashamed of yourself.
Minus 10 Elmer points.
Jeff
At 11:44 PM 11/30/2004, you wrote:
Sorry I cannot resist this one..
And you call yourself a Ham?
My wife the Novice could answer that question.
Basic Transistor theory..
even an op-amp inverter
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