Mike, I am using it with 2 loops, which are mounted at a 90 degree angle with respect to eachother. This allows me to switch direction, which is most pronounced on 160m and medium wave. The loops themselves are square rather than round (as recommended by LZ1AQ) due to mechanical constraints, furthermore each loop actually consists out of 2 loops in parallel to lower the inductance. I hardly use the dipole mode, since that almost always results in a much higher noise floor due to man made noise at my QTH.
Jim, David, Regarding differential inputs, I concur with David that the diagrams published on http://active-antenna.eu/amplifier-kit/technical-documentation/ suggest that the amplifier has a differential input, so not sure which schematic you refer to Jim? 73, Wouter Jan PE4WJ On Mon, Feb 2, 2015 at 5:59 AM, jim <jbol...@outlook.com> wrote: > There was a schematic published by LZ1AQ that showed the implementation of > a loop required that one of the inputs of the amp was referenced to ground. > > Jim > > -----Original Message----- > From: David Cutter [mailto:d.cut...@ntlworld.com] > Sent: Sunday, February 1, 2015 11:59 AM > To: Mike va3mw; jim > Cc: elecraft@mailman.qth.net; Wouter Jan Ubbels > Subject: Re: [Elecraft] Seperate Receive Antenna > > > Jim > > How did you determine that the LZ1AQ amplifier is not a differential amp? > the diagrams lead me to believe that it has differential inputs. Page 29 > shows the specification item 10 which states that the inputs are balanced. > What am I missing, where should I be looking? > > 73 > > David > G3UNA > > > >> On Jan 31, 2015, at 6:02 PM, jim <jbol...@outlook.com> wrote: > >> > >> > >> The LZ1AQ amplifier is NOT a differential input amp, rather it is > >> referenced to ground. > >> > >> This can have significant issues as it relates to common mode noise. > >> > >> As a result of my research, I ended up with a Pixel loop. The amp > >> has great characteristics, differential input, uses an A.C. wallwart > >> for low noise, and the install instructions isolate the amp from any > ground. > >> > >> The loop interface also has a control line input from your rig, that > >> controls an internal relay, so the amp is protected when you transmit. > >> The loop was designed by hams. > >> > >> The mechanical design of the loop is excellent, using welds at the > >> aluminum joints. > >> > >> I have no interest in the Pixel company, just a very satisfied customer. > >> So satisfied, I bought two of them and phase them with a DX > >> Engineering > >> NCC-1 phaser. > >> > >> Jim > >> W6AIM > >> > >> > >> > >> -----Original Message----- > >> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of > >> Wouter Jan Ubbels > >> Sent: Saturday, January 31, 2015 12:28 PM > >> To: elecraft@mailman.qth.net > >> Subject: Re: [Elecraft] Elecraft Digest, Vol 129, Issue 41 > >> > >> Hi Paul, > >> > >> I can recommend LZ1AQ´s active loop antenna. > >> See > >> > >> http://active-antenna.eu/ > >> > >> It offers a nice variety of antenna configuration options, and it > >> plays very well here as a separate RX antenna at my urban & noisy > >> QTH. The unit is of high quality, and very well documented. > >> I am using it with my KX3 and a homebrew switchbox which uses reed > >> relays for QSK switching, controlled by the KX3 PTT output taken from > >> the ACC2 jack. > >> > >> 73, > >> > >> Wouter Jan PE4WJ > >> > >> > >> > >>> Message: 2 > >>> Date: Fri, 30 Jan 2015 19:15:32 +0000 > >>> From: Paul Barlow <paul.bar...@upcmail.ie> > >>> To: <elecraft@mailman.qth.net> > >>> Subject: [Elecraft] Separate Receiving Antenna > >>> Message-ID: <dub405-eas19886eb1dccd9a8d869e61994...@phx.gbl> > >>> Content-Type: text/plain; charset="us-ascii" > >>> > >>> Dear Elecrafters, > >>> > >>> I have a very small and odd shaped garden in which to play Ham Radio. > >>> I have a K3 (and a K2 and... ), I run QRP CW and I was wondering if > >>> anyone had experience of using active loop antennas as receiving > >>> antennas to lower the noise floor. I was looking at Wellbrook's > >>> Website this afternoon, and I see that their loops get good reviews > >>> on EHam. I was wondering what experience you guys might have with > >>> these and similar antennas. > >>> > >>> 73, Paul EI5KI > >> ______________________________________________________________ > >> Elecraft mailing list > >> Home: http://mailman.qth.net/mailman/listinfo/elecraft > >> Help: http://mailman.qth.net/mmfaq.htm > >> Post: mailto:Elecraft@mailman.qth.net > >> > >> This list hosted by: http://www.qsl.net Please help support this > >> email list: http://www.qsl.net/donate.html Message delivered to > >> jbol...@outlook.com > >> > >> ______________________________________________________________ > >> Elecraft mailing list > >> Home: http://mailman.qth.net/mailman/listinfo/elecraft > >> Help: http://mailman.qth.net/mmfaq.htm > >> Post: mailto:Elecraft@mailman.qth.net > >> > >> This list hosted by: http://www.qsl.net Please help support this > >> email list: http://www.qsl.net/donate.html Message delivered to > >> va...@portcredit.net > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net Please help support this email > > list: http://www.qsl.net/donate.html Message delivered to > > d.cut...@ntlworld.com > > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
