On Tue, 22 Jun 2004 03:17:56 -0000, arholub wrote:
>Was just thinking about the keying levels out of a laptop as compared to a
desktop.
I've specifically looked at the keying levels on two of my IBM laptops with a
DC
coupled scope. One has a built-in serial port (T22) and the other, a T41, uses
a
B&B Electronics PCMCIA dual serial port card. Both put out more than enough to
very solidly key the NPN interverter (sometimes called a level shifter) that
needs to
sit between the computer and the radio's keying line. I have several inverters
built
up, all identical, that use a 2N4123 transistor that I had a lot of in my junk
box. So
far, I have used it to key a TS850, Omni V, K2, and TS790A.
Jim K9YC
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