PTT Signal Question

[Kevin Shaw]

I'm in the process of designing a USB interface board for my K2 and I have a
technical question concerning the "/DOT-PTT" signal in the K2. The signal
goes into Port D of the PIC processor. PTT is grounded when the microphone
is keyed yet I don't see a pull-up resistor on the signal. I believe Port B
of the PIC has internal pull-ups but not Port D. Is there a pull-up on that
signal somewhere on the schematic that I'm missing?

 

Thanks,

 

Kevin

N8IQ

 

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[Jim Younce]

Kevin:

Look on Page 1 of  1 of the Control Board on the bottom of the page
Connector P3 Pins 17 & 18 are tied to 5 Volts through 82K resistors in RP4
(5&6 7&8) .

73
Jim Younce K4ZM
K2  SN: 18


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[Kevin Shaw]

Ah! I see it now. Thanks Jim.

Kevin
N8IQ


-----Original Message-----
From: k4zm [mailto:[hidden email]]
Sent: Monday, March 13, 2006 2:06 PM
To: elecraft@Elecraft List; Kevin Shaw
Subject: Re: [Elecraft] PTT Signal Question

Kevin:

Look on Page 1 of  1 of the Control Board on the bottom of the page
Connector P3 Pins 17 & 18 are tied to 5 Volts through 82K resistors in RP4
(5&6 7&8) .

73
Jim Younce K4ZM
K2  SN: 18



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