Tag Archives: Ham Radio

DXtreme Monitor Log 11

Many thanks to SWLing Post sponsor, Bob Raymond with DXtreme Software, for sharing the following press release:


Product Announcement: DXtreme Monitor Log 11™

DXtreme Software™ has released a new version of its popular logging program for radio monitoring enthusiasts: DXtreme Monitor Log 11.

Monitor Log 11 lets listeners and DXers log the stations they’ve heard using advanced features that can enhance their monitoring experience.

Finding Broadcast Stations to Monitor

The Schedule Checker™ lets users import schedules from Aoki, EiBi, and FCC AM web sites and display schedule data according to the filter criteria they specify. A list box lets users switch between schedule types, and depending on the schedule type selected, users can filter schedule information by band, frequency, station, country, city, state, time of day, language, antenna direction, and target area.

When the What’s On Now? function is activated, the schedule refreshes automatically at the top of each hour for Aoki and EiBi schedules.

For each schedule item, Schedule Checker queries the Monitor Log 11 database to let users know – through user-defined, foreground and background display colors – whether they need to monitor a station for a brand-new or verified country. Schedule Checker also displays bearing and distance, runs optional Afreet Ham CAP1 propagation predictions, draws optional Afreet DX Atlas2 azimuth plots, tunes supported radios to schedule frequencies when users double-click schedule items3 4 5, and starts log entries for scheduled stations monitored.

Finding Amateur Radio Stations to Monitor

Monitor Log 11 integrates with optional Afreet Band Master6 to let users see, on its graphical interface, where hams are operating. Monitor Log 11 supplies Band Master with an Entity Needed List based on the user’s Monitor Log database, making it possible for Band Master to indicate the stations whose entities (countries) users need to monitor. When invoking Band Master, users can select an Entity Needed List for all bands or individually for the 160- through 6-Meter bands.

Finding Utility Stations to Monitor

A Links menu provides convenient access to user-specified blogs and web sites that can inform users as to where utility and other stations may be operating.
Logging Stations

Monitor Log 11 lets users log all kinds of stations — radio stations, television stations, broadcast stations, Amateur Radio stations, utility stations, military stations, and more! And it lets them log stations across the radio spectrum — from long wave, to medium wave, to short wave, and beyond.

The Last Log Entries Grid on the Monitor Log window shows up to 5000 of the most recent log entries added. Its records can be sorted, and double-clicking records displays detailed data on the Monitor Log window. Users can resize the grid columns and scroll horizontally to columns that do not appear initially. And because the names of stations and NASWA countries can be quite long, users can also display a larger, resizable Last Log Entries window. A Properties window lets users change the order of columns, the number of log entries to display, and the font and color attributes of grids and other program components, such as the Content Editor for describing the content monitored, the Script Editor for creating and editing scripts, the Direct Tune interface for tuning radios, and the Comments tab for typing ad hoc comments.

Reporting Reception

Users can create customized paper and e-mail reception reports for sending to stations plus club report entries for reporting catches to clubs and magazines.

When users add or display a log entry, Monitor Log 11 prepares a post announcing their DX catch and displays it on the Social Media Post tab. From there, users can drag the post to their favorite social media web sites to share their catch with others.

Using the Script Editor window, users can create and edit scripts that format reception reports, eReports, and social media posts to their liking. The software prompts users to select the script they want to use. Dozens of scripts come with Monitor Log 11.

Users can also print SWL and Address labels on industry-standard label stock, and send eQSL requests to hams automatically through the popular www.eQSL.cc site.

Imaging

Improv Imaging™ lets users associate ad hoc images with log entries using Capture, Scan, and Clipboard functions. Captures of stations received on digital applications, waterfall displays, facsimile and Amateur TV pictures are popular. The Improv Imaging tab and Application let users view images anytime, and an Improv Image Explorer lets them peruse their entire collection and display associated log entries.

QSL Imaging™ functions the same as Improv Imaging, but specializes in associating QSL cards and eQSLs with log entries.

Other Features

Rig Control — Retrieves the frequency and mode from supported radios and permits tuning from the Schedule Checker and Direct Tune interface. Rig control is provided through integration with Afreet Omni-Rig and the SDR applications listed on our web site, currently HDSDR4 (High Definition Software Defined Radio) and SDR Console5.

Audio Archiving — An embedded Audio facility lets users maintain an audio archive of stations heard.

Reporting — Produces Performance, Stations, and Log Entry reports that track the performance and progress of the user’s monitoring station. The software lets users FTP those reports to user-provided Web space for remote access. Some reports integrate with Afreet DX Atlas to generate pin maps.

Documentation — Context-sensitive Procedural Help, Field Help, and Microhelp are accessible per window to provide instructions quickly. A web-based Information Center is accessible from the Help menu for late-breaking assistance, and Installation Instructions and a Getting Started Guide are delivered in PDF format with the software.

Operating Systems, Pricing, Contact Information

DXtreme Monitor Log 11 runs in 32- and 64-bit versions of Microsoft Windows 10, 8.1, 8, 7, Vista, and XP. It retails for $89.99 USD worldwide for electronic distribution. Pricing for CD versions and upgrading users is available on our Web site. All prices include product support by Internet e-mail. For more information, visit www.dxtreme.com or contact Bob Raymond at bobraymond@dxtreme.com.

1 — Licenses for Afreet Ham CAP and Omni-Rig are required to use Ham CAP.
2 — A license for Afreet DX Atlas is required to perform plots and create pin reports.
3 — A license for Afreet Omni-Rig is required to use rig control with radios supported by Omni-Rig.
4 — Can be used for rig control. HDSDR is owned by Mario Taeubel. Refer to http://www.hdsdr.de/index.html for more information.
5 — Can be used for rig control. SDR Console is owned by Simon Brown, G4ELI. Refer to http://www.sdr-radio.com for more information.
?6 — A license for Afreet Band Master is required to use Band Master.

Click here to download a PDF of this press release.

Salvation Army requesting hams to help in Caribbean post hurricane

(Source: Salvation Army Team Radio Network via Eric WD8RIF and ARRL)

Greetings:

The Salvation Army’s Eastern Territory has asked SATERN to begin recruiting amateur radio operators from our Salvation Army Team Emergency Radio Network (SATERN) for potential deployments to the Puerto Rico & Virgin Islands Division.

THIS IS A RECRUITMENT REQUEST TO BE ON STANDBY ONLY!

This will not be an easy deployment so operators interested in deploying on behalf of The Salvation Army should carefully read and ensure that they can meet the conditions and requirements in the attached document(s):

Qualifications:

  1. Candidates must be capable of doing the work and meeting the qualifications contained in the attached Position Description for a Communications Specialist. The only exception to this is the requirement for Medic First Aid Training. That or similar training is a plus but not mandatory.(See attached file: SATERN-Communications_Specialist-Official.pdf)
  2. Additionally, candidates must be capable of meeting the qualifications and experience and equipment requirements contained in the attached document below.(See attached file: HurricaneMaria-SATERN_Deployment_Requirements.pdf )
  3. Candidates should pay close attention to the information in both documents. This will be an especially challenging deployment physically, emotionally, spiritually and technically. Do NOT sign up if you are not prepared for this.
  4. Candidates MUST fully complete a volunteer profile in the National Emergency Disaster Services (EDS) Volunteer Database. Instructions for creating a profile in the database are contained below my signature block.

Logistical Issues:

  1. DEPLOYMENT LOCATION: Puerto Rico or one of the U.S. Virgin Islands.
  2. DEPLOYMENT DATE(S): Not known at this time but could be as early as next week.
  3. DEPLOYMENT LENGTH: Operators should plan on a minimum two week (14 day) deployment. Be aware that travel to and from these areas is difficult and there are no guarantees of it being exactly two weeks.
  4. LODGING: Lodging will very likely be basic shelter style lodging in a church, gym, warehouse or similar rough arrangement. Be well prepared for hardship conditions. You will need to bring your own sleeping bag, cot (if you have one), etc. However, there is a possibility that there will be availability on the USS Kennedy, USS Wright or other ships.
  5. MEALS: Meals will likely be provided by The Salvation Army at whatever Incident Command Post (ICP) you are assigned to. It will likely be very basic meals served from one of our canteens (mobile kitchens).
  6. EXPENSE: The following essential expenses will be reimbursed:
    1. Travel expenses.
    2. Other expenses pre-authorized by officials of the Incident Management Team (IMT) at the site you are deployed to.
    3. Bring CASH – about $500 is recommended. Remember that all power, phone and internet are disrupted so it is highly unlikely you will be able use a credit card. Cash is KING on a deployment.
    4. EQUIPMENT:
      1. You will need to bring your own radio equipment as outlined in the attached document(s) above. It needs to be in good condition and capable of operating under conditions similar to, or more strenuous than, the worst Field Day imaginable.
      2. The Salvation Army will not reimburse repairs or replacement for your equipment. That responsibility belongs to the deployed operator and it is highly recommended that you make sure that your equipment is fully insured.

    Becoming A Candidate:

    Anyone who meets the above qualifications and desires to be deployed should do the following:

    1. Complete the volunteer registration. This includes completing the online course, Introduction to Salvation Army Emergency Disaster Services.
    2. Complete the form shown here.(See attached file: HurricaneMaria-SATERN_Deployment_Survey.pdf PDF Kb )
    3. Inform the following people by email of your interest in being on standby for a possible deployment AFTER completing number 1 and number 2 above.
      1. You must email your notification along with the COMPLETED form in number 2 above to the National SATERN Liaison (see (i) below and to your Territorial SATERN Coordinator who is one of the four people listed in (ii) below:
        1. The National SATERN Liaison: Bill(dot)Feist(at)USS(dot)SalvationArmy(dot)org
        2. The Territorial SATERN Coordinator for the state you live in (see below):Central Territory (IA, IN, IL, KS, MI, MN, MO, ND, SD, NE, WI):
          Bill Shillington (W9ZCL): SAOpsChief(at)aol(dot)com 

          Eastern Territory (CT, DE, MA, ME. NH, NJ, NY, OH, PA, PR, RI, USVI, VT)
          Maj. Tom Dingman (K2QMU): Tom(at)K2QMU(dot)net 

          Southern Territory (AL, AR, FL, GA, KY, LA, MD, MS, NC, OK. SC, TN, TX, VA, WV)
          Bill Feist (WB8BZH): Bill(dot)Feist(at)USS(dot)SalvationArmy(dot)org 

          Western Territory (AK, AZ, CA, CO, HI, ID, MT, NM, NV, OR, UT, WA, WY)
          Bill Feist (WB8BZH): Bill(dot)Feist(at)USS(dot)SalvationArmy(dot)org 

Please do not call the National SATERN Liaison on his cell phone. Send any questions you have by email.

Deadline: I need to know as soon as possible but certainly no later than the end of Sunday, 01 October 2017.

Thank you for giving this serious consideration. I look forward to hearing from you by no later than Sunday, 01 October 2017.

CNN: “Ham radio operators are saving Puerto Rico”

NASA/NOAA Satellite imagery showing the impact on Puerto Rico’s electrical infrastructure

(Source: CNN)

(CNN)The phone call from the Red Cross came in late Friday night, just as the full scale of Hurricane Maria’s calamity began taking shape.

“We need 50 of your best radio operators to go down to Puerto Rico.”
In the days after the worst storm in three generations hit the American island — and for many more to come — public electrical, land-line and cellular communication systems showed few signs of life. And radio networks used routinely by police officers, power company workers and other first responder still were down.

Yet, a key mode of communication — one not reliant on infrastructure vulnerable to strong winds and flooding — still crackled: the “ham” radio.

Answering the phone that night in Connecticut was the emergency manager for the American Radio Relay League, the group’s CEO said. For more than a century, this group has served as a hub for amateurs licensed to operate the dependable, if archaic, medium known as ham radio and eager to pitch in when disaster strikes.

When the Red Cross made its latest appeal for heroes, these were the people it had in mind.

Continue reading the full article at CNN online…

Amateur radio: “Playing Key Role in Puerto Rico”

 

(Source: NBC News)

When things went dark and quiet in Puerto Rico, a cadre of amateur radio operators became a lifeline on the island.

About two dozen amateur radio operators on the island helped police and first responders communicate when their radio networks failed completely. Some of the radio operators, or hams traveled on trucks to provide communications to the power company, PREPA.

“It’s a less than ideal solution, but it works and that’s the essence of amateur radio – make it work,” said Tom Gallagher, CEO of the American Radio Relay League, the national association for amateur radio.

Now the ranks of operator are about to get reinforcements.

At the request of the Red Cross, the league planned to send 50 radio operators into Puerto Rico with “enormous” radio gear in water proof containers, their own power supplies, new generators and solar arrays. The crew and equipment were to leave Thursday from Atlanta.

Their job, once set up and in place, will be to be the communication pipeline for the Red Cross Safe and Well program, helping people on the mainland trying to connect with loved ones on the island or get news of their status.

“You can relieve a lot of misery by telling people their relatives are okay,” said Gallagher, whose call sign is NY2RF.[…]

Continue reading the full article at NBC News…

A review of the W4OP portable magnetic loop antenna

The following review first appeared in the August 2017 issue of The Spectrum Monitor magazine.


The W4OP Magnetic Loop Antenna (Photo Credit: LnR Precision)

What can one say about portable antennas? They’re up, they’re down, they’re basic in design:  they either work for an intended purpose or they don’t.  But, I wondered, could they provide their service easily and conveniently, even in the field?

Last year, I decided to purchase a portable field antenna, and at the Dayton Hamvention I became the owner of the three-band (40/20/10) EFT Trail-Friendly antenna from LnR Precision.

Then, I caught a bug: the National Parks on the Air (NPOTA) bug. And, wow, I caught it in a bad way…! Having activated seven sites during the 2016 Dayton Hamvention with my buddy Eric McFadden (WD8RIF), I found NPOTA the perfect excuse to play radio outdoors. Last year, from August to December, I activated all but that initial seven of my ninety-one NPOTA park activations. All of these activations were QRP and all of them were “field” activations; meaning, I set up my field antenna each time; no activations were made with a mobile (vehicle) HF installation.  And I made 85% of all of my activations using LNR’s EFT Trail-Friendly antenna.

The EFT Trail-Friendly antenna is incredibly compact and quite easy to deploy.

The EFT Trail-Friendly antenna is end-fed and requires some sort of support system to raise the end of the 33’ radiator. Most of the time, I simply hung the lightweight EFT from a sturdy tree branch. On a few occasions, I hung the end on a 31’ or 22’ fiberglass telescoping pole. I was altogether pleased with its performance; indeed, I can’t recommend it enough for someone who wishes to have a simple, roll-up, resonant antenna for QRP field work. But it does have one limitation: it requires that source of external support, which I worried could undermine some NPOTA activations.

In December 2016, my buddy Eric (WD8RIF) and I organized a mini NPOTA DXpedition in Ohio.  I decided that en route to Ohio, I’d make a run through West Virginia and activate some relatively rare parks along West Virginia’s mighty river gorges.

Eric had made the same activation run earlier that year, and had advised me that when I seek permission to activate these parks, I would be asked to apply for and pay at least one, sometimes more, “special use permit” fees merely to drape the lightweight EFT antenna over a tree branch or to stake a fiberglass support pole in the ground. Even if my equipment is less invasive in the great outdoors than the poles and stakes of a basic pup tent, I understood US park trees and shrubs can be delicate, rare, or endangered, and even park soil can be, for example, geologically or archaeologically sensitive, so of course I didn’t want a mere antenna to bring about any harm––however minor––to the parks I was enjoying.

Eric had simplified this step by strapping a fiberglass pole antenna to his vehicle, thus avoiding either penetrating the ground or using park vegetation as a support.  So as not to potentially harm sensitive park environs, nor be obliged to hop through time-consuming (and expensive) administrative hoops, I decided I would adopt an option similar to Eric: I would use a portable antenna that could stand on its own, thus not requiring external support from park property.

Enter the W4OP magnetic loop antenna

LnR precision had only a few weeks before announced their new portable, self-supporting, magnetic loop antenna: the W4OP loop ($329.99 US).

I contacted LnR in November to tell them about my upcoming December NPOTA DXpedition, and inquired whether they thought the W4OP loop would be a good fit? They responded by sending me a loaner unit to both use and review. After all, what better way to evaluate an antenna than by using it in the field?  I said I’d be happy to give it a test drive.

The W4OP loop arrived in early December, about one week before my trip.

Contents of the loop package are straightforward:

  • The main loop assembly and support
  • The coupling loop assembly and clamp
  • The tuning box
  • The support feet assembly
  • An owner’s manual

The main radiator is a sturdy, flexible-yet-rigid shielded cable. The tuning box is a heavy PVC box, and the tuning knob has an appropriate amount of brake and drives a 6:1 reduction drive on the tuning capacitor.  

The overall package feels well-built and of very decent quality. The only piece of the equipment package I didn’t like are the four support feet: these feet attach to the bottom of the tuning box with red thumb screws, a very basic way of supporting the unit, since the red screws are challenging to tighten and almost any movement from the feet loosens the screws.  Since my review, however, LnR has designed a tripod mount for the W4OP loop which promises to make it much, much easier to deploy this antenna in the field. With the tripod mount, one would only need to pack a sturdy (camera) tripod, and then toss out the included stabilizing feet.

The manual is fairly simple and concise, but certainly provides enough information to get you on the air in short order.

On the air with NPOTA

I’m a bit embarrassed to admit that I was something of a newbie when it comes to passive mag loop antennas. I’ve used a number of wideband mag loops over the years––receive-only versions, to be precise––but had never used one specifically designed for amateur radio transmitting.

My first proper NPOTA activation using the loop was on the Blue Ridge Parkway at the Folk Art Center in the mountains of western North Carolina. The loop operates best when raised off the ground and sitting on a dielectric base.

Having no tripod mount at that point, I simply sat the antenna on a plastic storage bin which sat on top of a picnic table where I operated. It’s not ideal to be so close to the antenna, of course, but I thought I’d give it a go.

And go I did.  What truly surprised me was how many contacts I racked up in relatively short order on the twenty and forty meter bands using SSB at QRP levels. I’ve always been a wire antenna guy in the field who believed in getting antennas up as high as possible; it still blows my mind that an antenna so compact, in such a compromised position, could rack up the contacts thousands of miles away.

This first activation was the only chance I had to properly learn the dos and don’ts of this antenna before I had to deploy it in the field on my river run through West Virginia. There, I simply didn’t have the time to worry about the process. I did take a few notes, however:

  • The W4OP loop is high gain and very narrow band; if you move off frequency even a few kHz, you’ll certainly need to re-tune;
  • The bandwidth is so narrow that, if you’re turning the capacitor too quickly in the field–especially in windy conditions– you’ll miss hearing the audio level increase when you make the loop resonant;
  • Sometimes being near the loop while tuning the capacitor can affect the results;
  • Loop antennas are not terribly practical for hunting and scanning for DX across the bands due to frequent re-tuning;
  • For NPOTA or SOTA type activations where you operate on one frequency, the loop performance is downright amazing!

Mini DXpedition

My excursion into the three river gorges of West Virginia––the Bluestone, New River and Gauley––took an amazing amount of planning for such a short trip. Firstly, I only had a limited amount of time to activate each site, yet these were rare sites and I wanted to log as many stations as possible at each site. Secondly, I had to announce my activation times and frequencies well in advance so chasers could find and spot me. Also, I knew a number of west coast chasers who really needed one or more of these sites, so had to plot on-air times to maximize 20 meter propagation. Finally, an actual valid activation site has a lot of requirements and is not easy to find on a map!

Surprise snow started falling well before I even entered West Virginia that morning.

And––oh, yes––the weather was really dodgy.

As soon as I hit the West Virginia state line on I-77, the snow started in earnest. Despite being from the southeast, I’ve no fear of driving in snow, but this was a bit unexpected and no roads had been prepared in advance. Also, I was driving into some pretty remote areas with my least snow-capable vehicle: a minivan. The snow was bad enough that I knew I would not attempt to activate the New River Gorge at the site I originally planned, which required negotiating a very long, steep, and winding road deep into the gorge. Instead, Eric advised me of another New River site option that was more easily accessed. I readily took him up on his suggestion.

And it was at the alternate New River site where the loop antenna truly saved the activation.

The activation site was essentially a one-car off-pavement parking spot next to a river access for small boats. Space was tight, but plenty big for the loop antenna.

It was about 20F with sharp wind, and spitting snow; wind gusts were high. I set up two plastic storage bins with the W4OP antenna on top, only about four feet off the ground; fortunately it did not blow over. I tuned the loop quickly to my pre-announced frequency of 14.312 MHz. I made a couple of calls, was answered by a chaser who spotted me…and whoosh! In less than an hour, as I sat there in the freezing wind, I worked 70+ chasers with 15 watts SSB with my Elecraft KX3. It was exhilarating.

As I packed up my station to move to the next site, I quickly scanned over my log sheet: I found I had worked much of the east coast of North America, almost all of the west coast states, several Canadian provinces, Italy, Slovakia and Croatia.  All with this incredibly modest antenna.

Weather was much better in the New River gorge.

Signal reports were averaging about S7.

Of course, I was a DX target, which, as any ham will tell you, gives you an automatic 30 dB of gain! Still, people could hear me clearly even though I was at a fairly low elevation in a gorge.

Impressive.  I was really beginning to appreciate this antenna.

Problems at Gauley River

My next destination, the Gauley River, was about a seventy-minute drive from the New River and at a much higher altitude. The light rain turned into snow again accompanied by more very strong winds. I was really feeling chuffed about the easy loop setup ahead of me at the site.

 

After arriving on site, I set up the loop quickly, my Elecraft KX3 quickly followed, and started the tuning process. Unfortunately, I could not get the antenna to find a match on the 20 meter band. No doubt, the cold, the wind, my frozen hands, and a desire to stay on the tight schedule all influenced my ability to tune the antenna.

After ten minutes of trying to tune the loop, I initiated Plan B, pulling out the trusty EFT Trail-Friendly antenna and launching it into a nearby tree. The EFT didn’t fail me: once I was on the air, I worked almost 100 stations in a little over one hour.

I felt a little badly about hanging an antenna in a tree limb since I did not seek permission from the NPS in advance. Still, I was the only person at the park that day. No one in their right mind would have been hanging out by the roadside, save your author. I took comfort in the fact that the mature tree that aided me was entirely unharmed, and by the fact that not only do I strictly adhere to the Leave No Trace philosophy, I also clean up other visitors’  trash in the vicinity of all of my activation areas, as a means of honoring the park. I don’t think even the CSI would be able to find evidence of my activation.

Back to the loop.  When I finally arrived at the QTH of my buddy, Eric, we took the loop out and he hooked his antenna analyser up to it. Again, we were not able to get the excellent match I had on 20 meters earlier that day at the New River. Eric and I both assumed (incorrectly, it turns out) that something had happened to the capacitor inside the tuning box.

Once I returned home, I called Larry with LnR and described what was happening. He quickly identified the problem: the coupling loop wasn’t positioned and clamped correctly. Whoops…I should have considered that.  Once I adjusted the coupling loop an inch or so, it worked fine again.

Summary

Every radio, accessory, and antenna has its pros and cons. When I begin a review of a product, I take notes from the very beginning so that I don’t forget some of my initial impressions. Here is the list I formed over the time I’ve spent evaluating the W4OP.

Note that, since this was my first proper experience with a loop antenna for QRP operations, many of these items are indicative of loops in general, not just the W4OP.

Pros:

  • Excellent build quality and overall value
  • Excellent gain when tuned to a frequency (see bandwidth con)
  • Overall impressive performance in the field and super fast and simple setup
  • Excellent choice for those living in high-density neighborhoods with antenna restrictions
  • LnR telephone customer support is excellent

Cons:

  • Bandwidth is very narrow and the loop requires re-tuning on frequency changes (see gain pro)
  • Supplied support feet are very basic; splurge for the new tripod mount
  • Not always convenient and accessible to tune the antenna on the antenna base (though LnR will soon produce a remote tuning W4OP loop)

LnR Precision has recently released a remote tuning W4OP loop ($354.99) and a 6m kit for the current loop.

The W4OP Remote Loop Antenna (Photo: LnR Precision)

I think a remotely-tuned W4OP loop would make this an excellent antenna for amateur operators who wish to set up the antenna as a semi-permanent home installation; certainly a bonus for those living in restricted neighborhoods. Without a remote tuner, you would need to go to the antenna to make frequency adjustments. Note that LnR even has an upgrade program if you wish to turn your W4OP loop into a remote loop.

Of course, this first version of the W4OP loop isn’t designed as a permanent home antenna; it’s designed for field use.

And am I impressed with the W4OP loop? Absolutely.

Like me, if you’ve never used a mag loop antenna for field operations, spend a little time at home learning how to deploy it and tune it in advance.

Most of the criticisms of the W4OP loop I mention in this review are simply indicative of passive mag loops in general: narrow bandwidth, sensitivity to nearby metal objects, and the need for frequent re-tuning.

I understand that the W4OP may have even narrower bandwidth than other similar field-portable antennas. While some may consider this a disadvantage, I think I prefer it; in fact, I would rather be inconvenienced by re-tuning in exchange for higher overall gain.  After all, even broader bandwidth loops require re-tuning if you move frequency more than a few kHz.

The W4OP antenna meant that my mini NPOTA DXpedition was a success, especially at the super-restrictive New River access point. Though I’ve used it in the field on a number of occasions now, I’m still in awe when such a compact antenna performs so well on such little power.  I unhesitatingly recommend it.  Great job, LnR Precision!

The W4OP is made in the USA by North Carolina manufacturer LnR Precision. The loop, and its accessories, can be ordered directly from LnR:

http://www.lnrprecision.com/loop-antennas/