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:[email protected]] Sent: Sunday, February 1, 2015 11:59 AM To: Mike va3mw; jim Cc: [email protected]; 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 <[email protected]> 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:[email protected]] On Behalf Of >> Wouter Jan Ubbels >> Sent: Saturday, January 31, 2015 12:28 PM >> To: [email protected] >> 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 <[email protected]> >>> To: <[email protected]> >>> Subject: [Elecraft] Separate Receiving Antenna >>> Message-ID: <[email protected]> >>> 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:[email protected] >> >> This list hosted by: http://www.qsl.net Please help support this >> email list: http://www.qsl.net/donate.html Message delivered to >> [email protected] >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net Please help support this >> email list: http://www.qsl.net/donate.html Message delivered to >> [email protected] > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html Message delivered to > [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
