Johnny, To sweep the LPF in the K2 with an antenna analyzer, you must terminate the LPF with a 50 ohm resistor (51 ohms is a close enough standard value). Terminating the LPF is easy if you have the K160RX header installed - simply put the resistor leads between pins 7 and 2 of the K160RX header. If the K160RX is not installed, W1 must be removed and the resistor connected between the right end of W1 and ground.
To accomplish the sweep, select the band of interest and power off the K2 - connect the analyzer to the antenna jack and sweep across the band. You will not likely see a perfect SWR=1, but you will definitely see a low SWR and be able to observe the SWR climb as you approach the cutoff frequency. It is an easy and interesting exercise in observing filter behavior with frequency if you have never swept a filter before. For those filters with capacitors in parallel with the inductors (eliptical filters), you can see the very sharp increaase in SWR as you approach the resonance points. 73, Don W3FPR > -----Original Message----- > > Could please advise how I can use antenna analyser to achieve > better power > output with the LPF? Do you mean feeding the output of the antenna > analyser to the antenna jack with W1 terminated with 50 ohm load? > > > Johnny Siu VR2XMC > > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
