Hi Team,
I'd like to try out one of these amplifiers on a 1.8m aluminium loop I have built. Not sure if the designer Chris Trask himself has time to answer questions right now, but I thought I'd put them out on the mailing list in case anyone else could answer as well, and others might be interested in the answers anyway.
The loop I have built has the feed point at the top, and the balance point at the bottom is grounded to earth. It's up that way to get the business end as far up as possible. The bottom part is actually strapped to an alloy pole that is clamped to the centre pole of the old rotary clothesline out the back of the house. Hopefully that's fine, although she who wears the pants isn't totally impressed because it removes the "rotary" function out of the rotary clothesline.
I'm getting fairly good results with the lz1aq amp I have installed at present, but have IMD problems with BCB stations. I'm interested in 0 to 30MHz, so would rather avoid a BCB filter. The plan is to orientate the loop so the 2 local AM BCB transmitter sites are sitting in the null. (~90 deg at 2km and ~60 deg at 5km)
But my feedline I use is a run of Cat 5 ethernet cable, with one pair carrying the signal and the other 3 pairs sharing the +V and 0V load. So I need to reconfigure the amplifier's T6 output transformer for separate power feed, and balanced 100 ohm coming out.
Suggestions gratefully received.
Andy
ZL3AG
