Re: Topband: Question on active vertical spacing

My rx antennas are around 40 to 50 feet separated. I get good peaks and nulls on 160 and the top of the AM broadcast band. 80 m. doesn't work as well. But 160 is where you really want it to work. That's where noise is a big problem. Use a groundwave broadcast station on 1400 or higher to

Re: Topband: Question on active vertical spacing

Thank you very much for the info! 73 James KI0KN On Fri, Aug 6, 2021 at 8:18 AM Tim Duffy wrote: > Hello James: > > Responding on behalf of DX Engineering. I do not see your email in the que. > > You can separate the antennas 1/4 wavelength for 160 and the operation will > also be OK on 80

Re: Topband: Question on active vertical spacing

Hello James: Responding on behalf of DX Engineering. I do not see your email in the que. You can separate the antennas 1/4 wavelength for 160 and the operation will also be OK on 80 meters. You need the larger spacing so that the NCC-2 will work on 160. If you have questions, please refer them

Re: Topband: Question about on ground radials field.

Hi Jim, That simply makes the radiating part of the vertical taller and elevates feed point. Its known in professional antenna engineering circles as a sleeved monopole with elevated feed point. The classic version is a vertical with its feedline routed through a sleeve that is 1/2 the

Re: Topband: Question about on ground radials field.

The antenna becomes a ground mounted vertical having elevated feed. The wire from the ground radial system to the base of the vertical becomes a radiating portion of the vertical. The vertical has increased in length by the wire length. Dave KH6AQ On Thu, Dec 31, 2020 at 9:48 AM Jim Clymer

Re: Topband: Question about on ground radials field.

On 12/31/2020 11:47 AM, Jim Clymer wrote: This is somewhat related to the "Will radials on ground help?" thread. I have poked around in various discussion groups but haven't found a specific answer. The best way to learn technical things is to study them, and, and the best recent work on

Re: Topband: Question about on ground radials field.

Not a simple , on size fits all answer What happens depends on the frequency  you are talking about     ( I assume 1.825 but if it is a multi band vertical ..then???) and how much above the ground plane you are talking about And the approximate foot print of your radial systems ( square lot

Re: Topband: Question about KH1 to EU QSO possibilities with respect to auroral oval

IARU was going on and lots of people are on 6m for E skip season.  I have been leaving my rcv on 6m not 160 lately. W0MU On 7/14/2018 7:50 PM, Grant Saviers wrote: Agree. At my QTH 47.6 N (Seattle) the oval is almost always in the way to EU so long path on 80 is more reliable winter months

Re: Topband: Question about KH1 to EU QSO possibilities with respect to auroral oval

Agree. At my QTH 47.6 N (Seattle) the oval is almost always in the way to EU so long path on 80 is more reliable winter months if the EU's hang around for the west coast sunrise. So far EU on 160 has been very difficult. Not complaining since I was one of the lucky 120 that worked KH1 on

Re: Topband: Question about KH1 to EU QSO possibilities with respect to auroral oval

Rick, I live at about 59 deg North and also have operated from T2 and T32 of which T32 must be similar to KH1. At T32 my guess on propagation is that we could expect in a 4 week on air trip, four EU openings of one sort or another. On that basis the KH1 trip may get one or none, on a short

Re: Topband: Question for the K2AV FCP users...

Howdy, all. <<>> Peter's post here follows a direct inquiry some weeks ago that I was unable to fully answer before now. Wire mats connected to ground radials have been around a long time and instances reported improving sparse on/in ground radial systems. So an intuited extension to a mat on

Re: Topband: question about matching network for short vertical RX antenna

I've received word that the Dropbox link was requiring sign-ups to Dropbox, so I have created a link to the Smith chart using a different image upload service: http://imgur.com/a/RmE1Q 73, Matt NQ6N On Thu, Mar 9, 2017 at 1:04 PM, Matt Murphy wrote: > I realized the attached

Re: Topband: question about matching network for short vertical RX antenna

I realized the attached Smith chart image did not come through on the reflector so I posted it on the web, here is the chart: https://www.dropbox.com/s/nwfqr6xhsfdgjjb/Screenshot%202017-03-09%2013.03.33.png?dl=0 73, Matt NQ6N On Thu, Mar 9, 2017 at 12:46 PM, Matt Murphy wrote:

Re: Topband: question

  Hi Luis,   Your question about the BOG wire.   After my last email thinking possibly you were writing  about single wire BOGs. In this case the wire size is not important other than large enough not to break.. The insulation should be good I like plastic insulation.   My opinion:  

Re: Topband: question

Hello Luis,   The BOG wire is not the gauge of the wire, but the impedance. Many transformer  suppliers are using 150 ohms.   BOG antennas react with the earth it rest (sits) upon. The BOG length to get a good pattern varies a lot with the local earth. It is basically a one band antenna,

Re: Topband: question

I can't help about BOG questions but... For those who do not read Spanish (or most other languages) you can find out what you can not understand, here: https://www.google.com/webhp?sourceid=chro me-instant=1=2=UTF-8#q=transla te It is an on-line translator. Here is what it translates that

Re: Topband: Question on common mode chokes

Tnx, all, for the comments...learning more and more From: charlie-cunning...@nc.rr.com To: k...@pacbell.net; topband@contesting.com Date: Wed, 3 Jun 2015 21:57:27 -0400 Subject: Re: Topband: Question on common mode chokes I agree. We really don't want the coax shield to be part

Re: Topband: Question on common mode chokes

Jim, It will be interesting to see what others say but my take on this is that the tuner function is to provide an impedance match to the vertical and doesnt provide any choking. You still should have the choke. 73, Bob K6UJ On Jun 3, 2015, at 9:42 AM, James Rodenkirch

Re: Topband: Question on common mode chokes

Those would be transmitted signal strength concerns. On the receive side, if one ever listens on one's transmit antenna, the feed coax shield is a potential path for RF noise from the house. Any noise voltage allowed to go from the coax shield to the radials becomes a differential voltage versus

Re: Topband: Question on common mode chokes

On Wed,6/3/2015 9:42 AM, James Rodenkirch wrote: I seem to recall, while reading up on common mode chokes, where I wouldn't need one if I employ an autotuner at the base of the antenna...is that true/factual? The function of a choke on the feedline is to prevent it from becoming part of the

Re: Topband: Question on common mode chokes

. Regards, Charlie, K4OTV -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Robert Harmon Sent: Wednesday, June 03, 2015 4:21 PM To: Top Band Contesting Subject: Re: Topband: Question on common mode chokes Jim, It will be interesting to see what others

Re: Topband: Question...

before so that I can fix it. Hopefully I'll meet you on the air. Mike N2MS - Original Message - From: Eddy Swynar deswy...@xplornet.ca To: mstang...@comcast.net Cc: topband@contesting.com Sent: Sun, 01 Mar 2015 14:34:52 - (UTC) Subject: Re: Topband: Question... On 2015

Re: Topband: Question...

On 2015-02-27, at 4:04 PM, mstang...@comcast.net wrote: Eddy, You do have a computer in the shack. You are an internet operator. Ham radio was one of the first forms of social media. We used to discuss operating and contesting issues on the air with our nets. We replaced the radio

Re: Topband: Question...

) Subject: Re: Topband: Question... On 2015-02-27, at 4:04 PM, mstang...@comcast.net wrote: Eddy, You do have a computer in the shack. You are an internet operator. Ham radio was one of the first forms of social media. We used to discuss operating and contesting issues on the air with our nets

Re: Topband: Question...

: Jim Brown Sent: Saturday, February 28, 2015 2:51 AM To: topband@contesting.com Subject: Re: Topband: Question... On Fri,2/27/2015 2:33 PM, k8...@hughes.net wrote: Now people swap qsl's for contacts that they personally never heard; one's that their computers have worked instead That's funny

Re: Topband: Question...

On Fri,2/27/2015 2:33 PM, k8...@hughes.net wrote: Now people swap qsl's for contacts that they personally never heard; one's that their computers have worked instead That's funny -- I work meteor scatter and other WSJT modes, and I damned sure DO hear virtually all meteor scatter QSOs. There

Re: Topband: Question...

Ufff Again, again and again Would be great to have a REMOTE reflector!! 73, Jorge Enviado desde mi iPhone El 27/02/2015, a las 10:34, Eddy Swynar deswy...@xplornet.ca escribió: Hi Guys, My appreciation of computers in the Ham shack, I'm afraid, is limited to placing the contest QSOs

Re: Topband: Question...

This is just another genie in a long list of genies that have been let out of the bottle. We will all live through it. Mike W0MU On 2/27/2015 9:07 AM, Eddy Swynar wrote: Hi Guys, Wow...! What an interesting question I've posed re. my fictional ...working-North-Korea-from-a-remote-location

Re: Topband: Question...

Hi Eddy, You certainly can. However, you may not. I suspect the Japanese regulatory agency will have some say in how you operate in Japan and what you may use for a callsign. Your real question might be will dishonest hams do this? Probably. But where are you going to find any dishonest

Re: Topband: Question...

Well, you probably can operate a remote station somewhere via the Internet to work the next DXpedition to a rare-one, and/or North Korea if/when they get on the air. The QSO should count for your 160M total - but ONLY for your 160M DXCC total from where the transmitter, receiver, and antennas are

Re: Topband: Question...

Eddy, This is fine as long as you sign VE3XZ/JA drone. Mike N2MS On 02/27/2015 07:34 AM, Eddy Swynar wrote: Hi Guys, My appreciation of computers in the Ham shack, I'm afraid, is limited to placing the contest QSOs that I might make into Cabrillo format , post-contest, for benefit of

Re: Topband: Question...

I believe I understand what you are saying ... if you can't control it then legalize it. Doug -Original Message- thrown out a hotel upper storey window. Question: can I link myself via the internet to some remote ...rent-a-station in, say, nearby Japan, and use that station to QSO

Re: Topband: Question...

Hi Guys, Wow...! What an interesting question I've posed re. my fictional ...working-North-Korea-from-a-remote-location scenario...! Amazingly enough, fully 7 of the direct respondents to me stated that---in one way, shape, or form---one COULD, indeed, have the physical ability to do just

Re: Topband: Question...

me and spend more time on internet groups that on the air. We have met the enemy and it us. Mike N2MS - Original Message - From: Eddy Swynar deswy...@xplornet.ca To: topband@contesting.com Sent: Fri, 27 Feb 2015 16:07:17 - (UTC) Subject: Re: Topband: Question... Hi Guys, snip

Re: Topband: Question...

I don't think signing VE3XZ/JA is good enough for remote through Japan. The ones I know who do such stuff, have a special foreigner in JA call that starts with 7J, and there's even a special block of callsigns for club of foreigners in JA. The truly groundbreaking remote operations I know of, are

Re: Topband: Question...

...@comcast.net Cc: topBand List topband@contesting.com Sent: Fri, 27 Feb 2015 21:58:01 - (UTC) Subject: Re: Topband: Question... I don't think signing VE3XZ/JA is good enough for remote through Japan. The ones I know who do such stuff, have a special foreigner in JA call that starts with 7J, and there's

Re: Topband: Question...

, but now that it's made easy, very few do. As BB King said The thrill is gone... Brian Mattson K8BHZ -Original Message- From: mstang...@comcast.net Sent: Friday, February 27, 2015 4:04 PM To: Eddy Swynar Cc: topband@contesting.com Subject: Re: Topband: Question... Eddy, You do have

Re: Topband: Question - optimum number of radials

The r-f loss at the operating frequency in a set of buried radials varies with the conductivity and permittivity of the earth in which they are buried. The NEC4.2 study below shows that for poor earth conditions (within about 1/2WL from the base of the monopole), the number and length of

Re: Topband: Question - optimum number of radials

That's a lot of good information, Richard! Thanks for sharing! 73, Charlie, K4OTV -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Richard Fry Sent: Friday, February 14, 2014 7:00 AM To: topband@contesting.com Subject: Re: Topband: Question - optimum

Re: Topband: Question - optimum number of radials

On 02/14/2014 09:15 AM, Charlie Cunningham wrote: That's a lot of good information, Richard! Thanks for sharing! 73, Charlie, K4OTV The whole topic of radials as it applies to me on my small lot is put in as many as you can. The same probably applies to others on small lots. On top band I

Re: Topband: Question - optimum number of radials

While Tom touched on the subject yesterday the subject of an individuals ground conductivity has to be stressed, continuously it seems. The FCC maps arent perfect and hams usually dont have the options of perfect siting for their verticals as do many of the BC stations. Home developers often

Re: Topband: Question - optimum number of radials

: Friday, February 14, 2014 10:02 AM To: topband@contesting.com Subject: Re: Topband: Question - optimum number of radials On 02/14/2014 09:15 AM, Charlie Cunningham wrote: That's a lot of good information, Richard! Thanks for sharing! 73, Charlie, K4OTV The whole topic of radials as it applies

Re: Topband: Question - optimum number of radials

...@contesting.com] On Behalf Of Carl Sent: Friday, February 14, 2014 10:46 AM To: Tom W8JI Cc: topband@contesting.com Subject: Re: Topband: Question - optimum number of radials While Tom touched on the subject yesterday the subject of an individuals ground conductivity has to be stressed, continuously

Re: Topband: Question - optimum number of radials

w0btu.com/Optimum_number_of_ground_radials_vs_radial_length.html Check the links on that page to N6LF, Rudy Severns' pages. His work has been called the gold standard of radial science. 73, Mike www.w0btu.com On Thu, Feb 13, 2014 at 5:12 PM, DALE LONG dale.l...@prodigy.net wrote: I

Re: Topband: Question - optimum number of radials

N6LF has done quite a bit of actual testing of various in ground and elevated radial systems. See: http://www.antennasbyn6lf.com/ K3LC has done extensive modeling of both in ground and elevated radial systems: http://www2.gcc.edu/dept/elee/Faculty/Christman.htm However, if the majority of

Re: Topband: Question - optimum number of radials

I understand that 120 radials is the golden standard. At what point is there no significant improvement? 120 radials never was a gold standard. The FCC said if a AM BC station uses something like 110 radials, I forget the exact number, they can avoid doing a radial system proof of

Re: Topband: Question - optimum number of radials

Jerry Sevick, W2FMI, has an interesting comment about the 120 number in his book, The Short Vertical Antenna and Ground Radial. At the end of the first chapter he notes: ...it should be mentioned that the world standard for the number of radials to be used with verticals in the AM broadcast band

Re: Topband: Question - optimum number of radials

Jerry Sevick, W2FMI, has an interesting comment about the 120 number in his book, The Short Vertical Antenna and Ground Radial. At the end of the first chapter he notes: ...it should be mentioned that the world standard for the number of radials to be used with verticals in the AM broadcast

Re: Topband: Question - optimum number of radials

For anyone interested in modeling a vertical with a variable number of radials you might refer back to this post: http://lists.contesting.com/archives//html/Topband/2013-04/msg00017.html Near the bottom you'll find a link to download a .weq format model for use with AutoEZ. AutoEZ requires

Re: Topband: question about antenna bandwidth

Rob: A typical 3/8 wl inverted-L antenna is about 65 feet vertical and 125 feet horizontal or sloping back downwards at a slight angle.  This means that 2/3 of the wire is horizontal near the ground and is a high angle radiator - semi NVIS - and the vertical part is radiating at a low angle.  

Re: Topband: question about antenna bandwidth

If I were to extend my 1/4-wave inverted-L to a 3/8-wave L, and tune out the inductance with a fixed capacitor at the base, what would this do to the broadbandedness of the antenna? There is an old basic principle to remember about this, The fewer the components in general, the broader the

Re: Topband: question about antenna bandwidth

Another rule for this is the lower the Q of the matching network the greater the bandwidth. Herb Schoenbohm, KV4FZ On 5/7/2012 1:48 PM, Roy wrote: If I were to extend my 1/4-wave inverted-L to a 3/8-wave L, and tune out the inductance with a fixed capacitor at the base, what would this

Re: Topband: question about antenna bandwidth

I don't know how much bandwidth you could get with coaxial quarterwave transformer (say, two quarterwave lengths of coax in parallel to transform 12 Ohm of an inverted L to 50 Ohm)? In previous life I was used to use quarterwave 75 Ohm cable to broaden bandwith of 80m dipole(s)... 73 Mirko,

Re: Topband: question about antenna bandwidth

Roy, you didn't specify the vertical length of your inverted-L but I'll assume it is 50' and that your base-referred ground loss is 5 ohms. Using NEC-2 for the 1/4 wavelength inverted-L I get a 2:1 VSWR bandwidth of 51 kHz. Note the base resistance at resonance is 18 ohms. For the 3/8 wavelength

Re: Topband: Question about antenna bandwidth

On 2012-05-06, at 2:42 PM, Rob Stampfli wrote: If I were to extend my 1/4-wave inverted-L to a 3/8-wave L, and tune out the inductance with a fixed capacitor at the base, what would this do to the broadbandedness of the antenna? Hi Rob, The 2:1 SWR points on my extended 3/8-wave inverted

Re: Topband: question about RX splitter

Or, if you don't want to do your own packaging, I have a large quantity of new Minicircuits ZSC-2-1-75 available (same two-transformer design, although smaller cores). http://www.minicircuits.com/pdfs/ZSC-2-1-75+.pdf They have 75 Ohm BNC connectors (100% mechanically compatible with 50 Ohm BNC

Re: Topband: question about RX splitter

This high performance 3 dB splitter kit is available from Clifton Laboratories for only $5.00 including first class postage within the USA. Overseas price is only $6.00 including first class (air) postage. Easy payment via PayPal http://www.cliftonlaboratories.com/z10050a_3_db_hybrid.htm 73

Re: Topband: question about RX splitter

Guilles I cannot use a commercial splitter The small you can get is direct from Mini-circuits http://www.minicircuits.com/pdfs/ADP-2-1.pdf or http://www.minicircuits.com/pdfs/PSC-2-2+.pdf The best one available is a kit from K8ZOA http://www.cliftonlaboratories.com/z10050a_3_db_hybrid.htm

Re: Topband: question about RX splitter

- Original Message - From: VE2TZT ve2...@arrl.net To: topband@contesting.com Sent: Monday, October 17, 2011 5:17 PM Subject: Topband: question about RX splitter Hi Top band community, For a comming DXpedition I need to build a specific splitter with the following