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Need advice for Transamerica homebrew loop
I am gathering parts for a large loop for MW & 75m AM window. I'll be
taking the loop across America at the end of September. I hope to fatten up my MW & 75m logbooks. I hope to get up early every morning and do about 5-6 hours driving a day. Camping out at night with my Loop. I wish I could take my dog, but I'm flying back and I can't risk problems a dog might cause on that type of a trip. Loop has to be sturdy and fit in a 4'x4' space in my pickup. I'll cobble up a case for it so it don't get smashed. So loop is going to be near 4' on each side and I suppose enough turns to resonate a 450pf air variable. The variable has two 20pf-450pf sections. I'm told this variable came out of a Heath SB220 linear. I suppose I could wire the sections in series for 10pf to 225pf. So there is one question. How do I want to wire this thing up? More inductance and less capacitance? I'm afraid I might have problems tuning this thing if I wire them in parallel and i have a lot of Q. I might turn the shaft a microdegree and have the peak blow right by the station I'm going to tune. Now I think I can just stick the radio Degen DE-1103 portable near the loop and do ok. I shouldn't have to hardwire the thing into the radio, right? Not sure how to couple in 75m. Now how critical is the loading on the loop? Can I wind one turn and find a sweetspot in the way of coupling for best signal? I understand the loading -vs- Q issues with coupling. Now does the secondary suffer from some kind of balancing issues? In other words if I send the one turn secondary into a single ended preamp will that be a problem? Should I do a double ended preamp with a pair of Jfets? 3904s? Does this thing need to tilt, or is just spin around enough? Ok, I think that about covers it for now. I am leaving in a month, so I don't have a lot of time for research and experimentation. I know there are those here who know loops - I have read your posts. 73 NEO |
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