The manual says: http://www.elecraft.com/manual/E740156%20K3EXREF%20Installation%20and%20Operation%20Manual%20Rev%20A2.pdf Connect the external 10 MHz signal source to the K3 rear panel REF connector . The 10 MHz source should have a signal levelbetween +4 dBm and +16 dBm, nominal . For square wave sources, 2VDC to 3.3VDC peak is optimum. If the source is a 5V logic level, use a 50-ohm resistor in series with the input. Caution: To avoid damage to the K3EXREF, do not exceed these levels
My Jackson Labs LC-XO-Plus manual says: http://www.jackson-labs.com/assets/uploads/main/LC_XO-PLUS-specsheet1.pdf Oscillator Specification: Frequency Output 10MHz CMOS 5Vpp So I'm concluding the need for a 50ohm resister in series with the input. The K3EXREF board will come pre-installed with my new K3S, so I'd prefer an exterior solution. Is there a tidy little SMA connector with 50ohm in series that I can get off the shelf? Or would I have to make that? If so, how to best do that? I can certainly chop a SMA(M)-SMA(M) jumper in half and solder a 50ohm resister across the center wire, but I'm not sure how to maintain the shielding ground web. Twist each side and solder, sure, but seems I lose shielding of a delicate signal. Thanks for the help! BRET/KC1CJN -- View this message in context: http://elecraft.365791.n2.nabble.com/K3S-K3EXREF-10MHz-Voltage-Help-tp7620550.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
