If your PC is using a version of the Prolific driver other than the 3.2.0.0 version Miklor recommends, that may be the root cause of the keyup. My rig stopped keying up when I switched from the (newer, otherwise functional) driver Windows 7 picked to the 3.2.0.0 driver from Miklor. My conclusion is that the newer driver switches the TX line to the break or all-space state when the port doesn't have an open connection. Might only happen with this chipset and driver, I suppose. Your recommended procedure is certainly a good one in any case.

Regards,
Steve


On Thu, Mar 27, 2014 at 11:51 PM, Michael Rathbun <KL7F@kl7f.us> wrote:
On Thu, 27 Mar 2014 14:08:04 -0400, Stephen Hersey <n1xnxham@gmail.com>
wrote:

>Incidentally, is it normal for the UV-5R to key up when the serial cable is
>present? I'm going to make a practice of always having a dummy load
>connected when programming this radio.

It is the case here, with two (non-counterfeit) cables.  The rig keys up as
soon as the software (any software) activates the serial port.

I have identified two solutions:

1.  Connect the unit to the cable (power off!), prepare Chirp so that you
only need to click the OK button in order to start the transfer, power the
unit on, and click the OK button as soon as the rig's display lights up.
The transfer begins and the transmitter doesn't turn on.

2.  Put in a receive-only channel (I have local NWS in channel 1, with
transmit disabled), set the rig to that channel, plug stuff in, run Chirp,
everybody happy.

mdr KL7F
--
   Sometimes half-ass is exactly the right amount of ass.
       -- Wonderella

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--
Steve Hersey N1XNX
n1xnxham@gmail.com
-----
Each of us has strengths and talents that others don't. Whether innate or learned, these are gifts -- and a gift not shared is a sad and lonely thing. Using our gifts for the benefit of all is an ethical obligation for every intelligent being. (The magic only works if you pass it on!)