Wanting to try to phase two end to end Beverages I took several MFJ Noise Canceller 1026 and 1025 of the shelf and while trying to evaluate their ability I noticed on both unit that even without any antenna connected to either input there is a least an S-unit increase in background noise. One of the units has a built in pre-amp that that was switched off.
My question: Is this normal? Won't that noise increase mitigate any improvements I could ever achieve by trying to get a signal enhancement from two Beverages pointed in the same direction. Both units do a great job of nulling a AM station on the expansion band right off the front end of both antennas almost down to the noise. But with the two units in the null and the phase switched reversed I was expecting an enhancement in that direction but either Beverage produced higher signal level when the unit is by-pass by turning it off or with either antenna hooked directly to the receiver. Also my two Beverages that I am trying to phase are end to end. Both are 600' long and pointing west. The first one ends where the other begins with a spacing of 3 feet and with separate ground rods. I have seen plots, models, and gain figures for broadside or side by side phasing of Beverages but have not seen anything on end to end attempts. Maybe this does not work to any advantage. Right now the only thing I have noticed is the increase noise floor when the unit is turned on and the ability to null stations from the front, both traits are not needed nor desired. Any suggestions on this would be appreciated. Herb Schoenbohm, KV4FZ _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK