There is some interesting reading on loop theory here: http://w8ji.com/magnetic_receiving_loops.htm
73 -Jim NU0C On Tue, 1 Jan 2019 06:13:25 +0800 Simon <[email protected]> wrote: > Hi Al, > > Thanks for advises. > > Why u have a horizontal loop? From web photo, most is vertical (vertical as > the hollywood sign on hill) > > Are these receive loop consists of 1 turn of coil and another outer > shielding tube, earthed to eliminate minor e field pickup. Outter shield > tube with a small gap, not a full ring as it short circuit the inner coil. > > Is the coil as construction above, for use in MW AM radio factroy connect > to signal generator to create a standard h field to be picked up by ferrite > bar in mw am radio, since year 1950 style? > > 73 Simon > > On Monday, December 31, 2018, Al Pawlowski <[email protected]> wrote: > > > The loop you reference is a broadband, amplified, rx only loop - not > > really a (small tuned) magnetic loop. > > > > I use an LZ1AQ setup with a horizontal loop, vertical loop and a vertical > > dipole - switchable via the LZ1AQ's onboard input relays. > > > > Both loops are significantly less “noisy" than the dipole and the vertical > > loop is usually quieter than the horizontal loop. > > > > I also have a rotatable, vertically mounted, small tuned loop (MFJ) which > > can, at times, beat the LZ1AQ loops on rx SNR because of the tuning - the > > tradeoff, of course, being bandwidth limits. > > > > > > Al Pawlowski, K6AVP > > Los Osos, CA USA > > > > > > > > On Dec 29, 2018, at 14:28, [email protected] wrote: > > > > Date: Sun, 30 Dec 2018 05:36:06 +0800 > > From: Simon <[email protected]> > > To: "[email protected]" <[email protected]> > > Cc: WSJT software development <[email protected]> > > Subject: Re: [wsjt-devel] SOTA test at 'low radio noise' area to > > evaluate 'slow mode' perfromance > > > > How good is magnetic loop antenna, may be with amplifier for receive > > only, in REJECTING man made noise, especially at or near city area, > > with huge number of SMPS, florescent lamp etc. at people's home? > > > > This websdr use loop and received around 90 to 100 countries per week > > on pskreporter.info statistics. (loop currently down)……….. > > > > > > _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel
