I brought out a connection from the sub-Rx IF of my K3, today. Not too hard once I figured out a couple things. I am tapped into the IF at P86A (or W3). This is the input to the Noise Blanker on the KRX3. One caution is that +9vdc is present at this point so one must provide a .001 uF coupling capacitor to block the DC as this is subject to loading or shorting when you connect to the IF. I used a small disc ceramic cap.
The cap feeds a run of RG-174 (100% shield Belden 7805) coaxial cable which I have placed two ferrite beads over the coax shield at the connection to the cap. I bring the coax out a large hole in the KRX-3 shield where I added two windings thru a .37 inch toroid core for more decoupling. The coax then runs to a panel-mount (UG-1094) BNC connector in the hole provided for the XV144 internal transverter (which I do not have). This provides equal signal level as the the main-Rx IF to my LP-Pan's. I will write up the installation with plenty of photos on my webpage for the Linrad Project: http://www.kl7uw.com/LINRAD.htm A big CAVEAT to anyone considering doing this: Use anti-static mat, wrist-strap, and ground your tools and solder iron to the radio case before touching any circuitry. This is best left to the experienced builder. 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep [email protected] ====================================== ______________________________________________________________ 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
