Well, that FO0AAA KAZ terminated loop has pretty good gain as terminated RX loops go, so I wouldn't expect the system to be noise starved, but the gain opf that loop is of the order of -30 dBi at 160, so a preamp is in order.
Charlie, K4OTV -----Original Message----- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI Sent: Thursday, August 22, 2013 9:41 PM To: 'topband' Subject: Re: Topband: Two 2:1 transformers to choose from!! > > Since you wound both transformers, why not try them both, and see if you > can measure any difference? I' guessing you won't see much! > Unless the antenna system is starved for background noise, or the element is in an end-fire phased array, it makes very little difference. The only real effect of mismatch is signal and noise from the antenna drop equally. Outside of a low sensitivity array, or an array that is phased end-fire, until background drops with 10 dB of RX system noise floor, or preamp noise floor, it really doesn't matter. Two turns for 75 ohms is plenty for decent 100 kHz to 30 MHz performance. Now if you hook up a Sky Buddy, it's a different problem. :) Tom _________________ Topband Reflector _________________ Topband Reflector