Pete -

The Red (Wht/Red) is Vcc+10, the Green (Wht/Grn), is the RF Output, and the Brown is most likely "sorta" black and is the Ground. The RIT is the terminal on the side of the PTO, (used to be the RTTY shift.)

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 4-B, C-Line&  TR-4/C Service Supplement CDs
<www.k4oah.com>


RadiosRUs wrote:
I recently purchased a Drake TR-7 PTO that I will be using in a homebrew radio project. What I don't know is which wire is which. There are three wires coming from the PTO. A red, green and brown wire plus I assume case ground is yet another connection. One wire I am sure is for Vcc, another one has to be for the output and I think other wire goes to an internal varactor. Help please.
Thanks
Pete N6QW

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