[Elecraft] K3 Key Out line

I noticed from the documentation that the K3 Key out line can handle up to 200 VDC and 5 amps. I assume this means that when the key out is closed that it can handle 5 amps of current. So, I am curious, what kind of switch mechanism is used for TR switching. Is this an actual relay or is it

Re: [Elecraft] K3 Key Out line

Hi Phil, Key out is driven by a very rugged N-channel MOSFET. 73, Wayne N6KR On Dec 23, 2009, at 9:01 AM, Phil Hystad wrote: I noticed from the documentation that the K3 Key out line can handle up to 200 VDC and 5 amps. I assume this means that when the key out is closed that it can

Re: [Elecraft] K3 Key Out line

Phil, There is no direct relationship between the KEYOUT line and the T/R switch in the K3. The T/R switch is fully electronic, no relays to clack and clatter. The KEYOUT line goes to ground before the onset of RF - and the delay can be adjusted in the menu. It is normally used for keying

Re: [Elecraft] K3 Key Out line

Phil, You can see the T-R switching circuitry in the schematics available on the Elecraft web site. Just search for t-r and you'll find the circuitry for both the 10W and 100W PAs. -- 73 -- Brian -- K1LI On Wed, Dec 23, 2009 at 12:01 PM, Phil Hystad k7...@comcast.net wrote: I noticed from