Re: Topband: Hi-Z Antennas
Hi Tim, Thanks for the update. I am glad to hear that Hi-Z product line will be making a comeback. 73, Mike W4EF.. On 9/26/2024 7:19 AM, Tim Duffy wrote: HI Mike; I am glad you asked. I do know what is happening and will share here. We are redesigned the outdoor enclosures for many HI-Z products to make them better for outside use. There will be a time when some HI-Z products will not be available, but they will be back. Stay tuned. We have introduced new products like the AVA-3 which is the best in class short vertical buffer amplifier - built with precision components (1% tolerance). This replaces the DXE AVA-2 and the HI-Z buffer amplifier. https://www.dxengineering.com/parts/dxe-ava-3 You can always ask me directly if there is a particular product or question you have. Thanks and 73, Tim K3LR CEO DX Engineering -Original Message- From: Topband [mailto:topband-bounces+k3lr=k3lr@contesting.com] On Behalf Of Michael Tope Sent: Thursday, September 26, 2024 1:10 AM To:topband@contesting.com Subject: Topband: Hi-Z Antennas I noticed that DX Engineering is listing a bunch of Hi-Z products as "not available". Does anyone know what is happening there? 73, Mike W4EF... _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Hi-Z Antennas
I have several of the DXE AVA-5 on each element in a 9 circle array, and 1 on a public accessible KiwiSDR remote receiver. They work great. Steve, NA5C Sent from my mobile device > On Sep 26, 2024, at 9:25 AM, Tim Duffy wrote: > > HI Mike; > > I am glad you asked. I do know what is happening and will share here. > > We are redesigned the outdoor enclosures for many HI-Z products to make them > better for outside use. > There will be a time when some HI-Z products will not be available, but they > will be back. Stay tuned. > > We have introduced new products like the AVA-3 which is the best in class > short vertical buffer amplifier - built with precision components (1% > tolerance). This replaces the DXE AVA-2 and the HI-Z buffer amplifier. > https://www.dxengineering.com/parts/dxe-ava-3 > > You can always ask me directly if there is a particular product or question > you have. > > Thanks and 73, > Tim K3LR > CEO DX Engineering > > -Original Message- > From: Topband [mailto:topband-bounces+k3lr=k3lr@contesting.com] On > Behalf Of Michael Tope > Sent: Thursday, September 26, 2024 1:10 AM > To: topband@contesting.com > Subject: Topband: Hi-Z Antennas > > I noticed that DX Engineering is listing a bunch of Hi-Z products as > "not available". Does anyone know what is happening there? > > 73, Mike W4EF... > > _ > Searchable Archives: http://www.contesting.com/_topband - Topband Reflector > > > _ > Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Hi-Z Antennas
HI Mike; I am glad you asked. I do know what is happening and will share here. We are redesigned the outdoor enclosures for many HI-Z products to make them better for outside use. There will be a time when some HI-Z products will not be available, but they will be back. Stay tuned. We have introduced new products like the AVA-3 which is the best in class short vertical buffer amplifier - built with precision components (1% tolerance). This replaces the DXE AVA-2 and the HI-Z buffer amplifier. https://www.dxengineering.com/parts/dxe-ava-3 You can always ask me directly if there is a particular product or question you have. Thanks and 73, Tim K3LR CEO DX Engineering -Original Message- From: Topband [mailto:topband-bounces+k3lr=k3lr@contesting.com] On Behalf Of Michael Tope Sent: Thursday, September 26, 2024 1:10 AM To: topband@contesting.com Subject: Topband: Hi-Z Antennas I noticed that DX Engineering is listing a bunch of Hi-Z products as "not available". Does anyone know what is happening there? 73, Mike W4EF... _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Hi Z Antennas
Dennis, I congratulate you on your efforts to make your top band receiving adequate despite your local noise. There have been too many poor excuses for remote RX sites. You exemplify the true ham spirit, experimenting with antennas that fit your needs at your location. I wish others would do the same. See you in the contest this weekend and good luck. 73, Larry n7dd Sent by Larry On Nov 30, 2018, at 1:10 PM, Dennis W0JX via Topband wrote: I have had a Hi-Z four square up since early 2012. It is a very good system for my needs. I have adequate land - although it was necessary to put it out in the front yard to get it away from the TX antenna - for the 80 foot per side layout. I see 18 to 24 db front to rear rejection depending upon angle of signal arrival. My system is probably compromised by power lines that border two sides of my property. The Hi-Z is connected to the second RX in my K3 and is used in diversity mode on 160 and 80. For main RX on the low bands I used to have two, 450 foot reversible beverages. However local noise sources have made those beverages almost unusable in the past 5 years. Hence I was forced to put up antennas which have excellent rear rejection. For that purpose, I installed three "dual flag" receive arrays. These are similar to DHDL rx antennas developed by George, AA7JV except that I use two flag loops instead of the half deltas. The flag antennas (really simplified Waller flags) have excellent rear rejection and make the AC power line noise almost non-existent. If you purchase the Bev-Flex, I do recommend installing it as a EWE or FLAG. If you go with the Hi-Z two element, make sure there are no antennas or large metal objects in near by proximity or you won't get the receiving pattern you need. 73, Dennis W0JX Milan, OH _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Hi Z Antennas
I have had a Hi-Z four square up since early 2012. It is a very good system for my needs. I have adequate land - although it was necessary to put it out in the front yard to get it away from the TX antenna - for the 80 foot per side layout. I see 18 to 24 db front to rear rejection depending upon angle of signal arrival. My system is probably compromised by power lines that border two sides of my property. The Hi-Z is connected to the second RX in my K3 and is used in diversity mode on 160 and 80. For main RX on the low bands I used to have two, 450 foot reversible beverages. However local noise sources have made those beverages almost unusable in the past 5 years. Hence I was forced to put up antennas which have excellent rear rejection. For that purpose, I installed three "dual flag" receive arrays. These are similar to DHDL rx antennas developed by George, AA7JV except that I use two flag loops instead of the half deltas. The flag antennas (really simplified Waller flags) have excellent rear rejection and make the AC power line noise almost non-existent. If you purchase the Bev-Flex, I do recommend installing it as a EWE or FLAG. If you go with the Hi-Z two element, make sure there are no antennas or large metal objects in near by proximity or you won't get the receiving pattern you need. 73, Dennis W0JX Milan, OH _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5
Tnx, Jeffr, for your observations..Jim R. K9JWV > From: j...@ac0c.com > To: rodenkirch_...@msn.com; topband@contesting.com > Date: Tue, 11 Feb 2014 20:02:48 -0600 > Subject: Re: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5 > > It takes some mental gymnastics to wrap your head around a hi-z feedpoint > where the radial system is almost negligible vs. a low-z feedpoint (like a > typical 30 ohm range transmit vertical) which is strongly dependent on the > radial system. I have the hi-z pro4-8 circle array and never thought at > gut-level those short verticals and 4’ ground rods would work as advertised - > but the performance is really fantastic. I guess that’s the march of > technology moving the art forward. > > In addition to 80/160 (intended application) I have found the array very > useful on 30 and 17m as well. I have a vertical dipole on 30 for transmit so > the residual directivity of the circle is a benefit there. And on 17 it’s as > good or better than my 3-element monobander. I suspect the 17m improvement > comes from the relatively closer location of that beam (near the house) > compared to the circle (800’ away from anything). > > 73/jeff/ac0c > www.ac0c.com > alpha-charlie-zero-charlie > > > > From: James Rodenkirch > Sent: Tuesday, February 11, 2014 7:55 PM > To: Jeff Blaine ; Top Band Contesting > Subject: RE: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5 > > > Tnx, Jeff > > > > From: j...@ac0c.com > > To: rodenkirch_...@msn.com; topband@contesting.com > > Date: Tue, 11 Feb 2014 18:35:00 -0600 > > Subject: Re: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5 > > > > The Hi-Z buffers have a feedpoint Z around 50K ohms. So a single 4' ground > > rod provides an adequate round system. No radials needed. > > > > 73/jeff/ac0c > > www.ac0c.com > > alpha-charlie-zero-charlie > > > > -Original Message- > > From: James Rodenkirch > > Sent: Tuesday, February 11, 2014 3:20 PM > > To: Top Band Contesting > > Subject: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5 > > > > Do the two verticals require any type of radial system or can a simple > > "array" of 4 to 6 20' radials do the job?? > > 72, Jim R. K9JWV > > _ > > Topband Reflector Archives - http://www.contesting.com/_topband > > > > _ > > Topband Reflector Archives - http://www.contesting.com/_topband > _ > Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5
It takes some mental gymnastics to wrap your head around a hi-z feedpoint where the radial system is almost negligible vs. a low-z feedpoint (like a typical 30 ohm range transmit vertical) which is strongly dependent on the radial system. I have the hi-z pro4-8 circle array and never thought at gut-level those short verticals and 4’ ground rods would work as advertised - but the performance is really fantastic. I guess that’s the march of technology moving the art forward. In addition to 80/160 (intended application) I have found the array very useful on 30 and 17m as well. I have a vertical dipole on 30 for transmit so the residual directivity of the circle is a benefit there. And on 17 it’s as good or better than my 3-element monobander. I suspect the 17m improvement comes from the relatively closer location of that beam (near the house) compared to the circle (800’ away from anything). 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie From: James Rodenkirch Sent: Tuesday, February 11, 2014 7:55 PM To: Jeff Blaine ; Top Band Contesting Subject: RE: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5 Tnx, Jeff > From: j...@ac0c.com > To: rodenkirch_...@msn.com; topband@contesting.com > Date: Tue, 11 Feb 2014 18:35:00 -0600 > Subject: Re: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5 > > The Hi-Z buffers have a feedpoint Z around 50K ohms. So a single 4' ground > rod provides an adequate round system. No radials needed. > > 73/jeff/ac0c > www.ac0c.com > alpha-charlie-zero-charlie > > -Original Message- > From: James Rodenkirch > Sent: Tuesday, February 11, 2014 3:20 PM > To: Top Band Contesting > Subject: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5 > > Do the two verticals require any type of radial system or can a simple > "array" of 4 to 6 20' radials do the job?? > 72, Jim R. K9JWV > _ > Topband Reflector Archives - http://www.contesting.com/_topband > > _ > Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5
Tnx, Jeff > From: j...@ac0c.com > To: rodenkirch_...@msn.com; topband@contesting.com > Date: Tue, 11 Feb 2014 18:35:00 -0600 > Subject: Re: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5 > > The Hi-Z buffers have a feedpoint Z around 50K ohms. So a single 4' ground > rod provides an adequate round system. No radials needed. > > 73/jeff/ac0c > www.ac0c.com > alpha-charlie-zero-charlie > > -Original Message- > From: James Rodenkirch > Sent: Tuesday, February 11, 2014 3:20 PM > To: Top Band Contesting > Subject: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5 > > Do the two verticals require any type of radial system or can a simple > "array" of 4 to 6 20' radials do the job?? > 72, Jim R. K9JWV > _ > Topband Reflector Archives - http://www.contesting.com/_topband > > _ > Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5
The Hi-Z buffers have a feedpoint Z around 50K ohms. So a single 4' ground rod provides an adequate round system. No radials needed. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie -Original Message- From: James Rodenkirch Sent: Tuesday, February 11, 2014 3:20 PM To: Top Band Contesting Subject: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5 Do the two verticals require any type of radial system or can a simple "array" of 4 to 6 20' radials do the job?? 72, Jim R. K9JWV _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5
How's the phasing controlled amongst those antennas, Gary? Coaxial phasing lines and relays? Or more complex networks? 73 Charlie, K4OTV -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Gary Smith Sent: Tuesday, February 11, 2014 6:12 PM To: Topband@contesting.com Subject: Re: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5 I have the triangular array and the antennas are the same. No, you don't need radials with these. My elements are about 20' tall and the preamp mounted to the antenna itself is attached to a ground rod at the base of the antenna. Works great. 73, Gary KA1J > Do the two verticals require any type of radial system or can a simple "array" of 4 to 6 20' radials do the job?? > 72, Jim R. K9JWV > _ > Topband Reflector Archives - http://www.contesting.com/_topband > --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5
I have the triangular array and the antennas are the same. No, you don't need radials with these. My elements are about 20' tall and the preamp mounted to the antenna itself is attached to a ground rod at the base of the antenna. Works great. 73, Gary KA1J > Do the two verticals require any type of radial system or can a simple > "array" of 4 to 6 20' radials do the job?? > 72, Jim R. K9JWV > _ > Topband Reflector Archives - http://www.contesting.com/_topband > --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Hi-Z Antennas back in business
Here is the latest on the court case: http://docs.justia.com/cases/federal/district-courts/ohio/ohndce/5:2010cv028 06/171142/24/. It appears that the pending patent infringement lawsuit has been suspended for now. 73, John W1FV ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
