Jack, 20-30 feet separation puts your antennas in each others' near fields, and they become coupled together [i.e. you're trying to receive on conductors that are actually parasitically part of your partner's transmit antenna]. Invest in a roll of coax and get them at least a couple of wavelengths apart, more is better. It'll make a big difference, and may get the QRM down to levels the K3 can handle. You may still need a couple of filters for 80/40 operation, the the higher frequency bands may turn out OK. Don't even think about 80/75 operation, we fried the T/R switch diodes in a K3 when someone tried that at our M/2 CQP expedition.
73, Fred K6DGW - Northern California Contest Club - CU in the 2012 Cal QSO Party 6-7 Oct 2012 - www.cqp.org On 10/27/2011 2:21 PM, Jack Nelson wrote: > We are generally using K3s and W3EDP antennas or maybe a Buddipole. The > antennas are 20-30 feet apart, so as you might guess, If one of us is on 40, > the guy operating on 20 knows it and visa versa. ______________________________________________________________ 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
