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HG3 Stepper Mag Loop Available

For Imediate Release

Jun 2, 2020 Aurora, Oregon

The HG3 Stepper MLA, our flagship magnetic loop antenna, is now available for sale. The HG3 MLA delivers unprecedented capability, performance and convenience. It employs a proven, accurate and repeatable stepper motor design.  Band selection, remote tuning, including optional loop rotation, is controlled by a microcontroller driving a high-resolution stepper motor.  An integrated digital SWR bridge allows auto-tuning based on an SWR scan. This ensures compatibility with most radios. Manual tuning uses a convenient rotary encoder knob – no more finicky push buttons. The four-line LCD shows the band selected, SWR, ERP, Cap value and more.

The new HG3 Stepper Mag Loop and companion microprossor based controller

Said Roger Stenbock – W1RMS: “Conceptually, an MLA is a very simple antenna. It is popular because of its performance and simplicity. So it’s no surprise the internet is filled with all types of MLA projects and experiments. Many created by ham radio experimenters. Some are quite elegant, promising impressive capability. Others are notworthy in their simplicity and minimalistic execution. Still others features sophisticated software based solutions.  They all serve the experimenters and home brew market well. My hat off to them. Yet, few, if any, of these projects are available for sale as a ready-to-go product. So many hams built their own MLAs. We listen to them. Many are our customers. They wanted more than the simple loop and touchy tuning cap. They wanted a professional grade, full feature, remotely tuned, no compromise, turn-key MLA.

That’s where the HG3 Stepper Mag Loop comes in.  It is a clean sheet of paper design. The development taking most of last year. Mostly by tackling the myriad of pro and con MLA factors and designing practical solutions. The result is the first turn-key, commercially available, micro controller based, stepper tuned MLA. One that combines auto tuning and rotation into one integrated, high performance package, ready to go on the air immediately.

A special thanks to the development team members: Rob Kirkpatrick KI6HNA – lead tuner design, Travis Cannon – lead firmware design, Audrie Crane-manager manufacturing, Harold Crane – fabrication and Florene Stenbock – word smith”

Price for a complete, turn-key package starts at $935. An introductory upgrade discount offer is available to all current preciseRF MLA customers. Order the HG3 Stepper Mag Loop here. Watch the HG3 Stepper Mag Loop video, get more details in the HG3 User Guide . For more information check – Editorial contact: Roger Stenbock W1RMS

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New Magnetic Loop Antennas to be Introduced at 2019 SeaPac

PRESS RELEASE –  May 21, 2019

HG-1 WR (water resistant) remotely tuned MLA for outdoor deployment

Aurora, Oregon: PreciseRF, announced today the introduction of the new HG-1 WR (water resistant) remotely tuned Magnetic Loop Antenna (MLA) intended for outdoor deployment and the companion AR-1 antenna rotator. Also introduced are a number of MLA accessories. All these new products will be available at the SeaPac ham radio gathering in Seaside, Oregon. SEA-PAC 2019 is May 31, June 1-2 2019. For all the new product details click on the Catalog.

Spring 2019 Catalog

Said Roger Stenbock – W1RMS  “The Magnetic Loop Antenna (MLA) is well known for its superior selectivity, low noise and high directivity. Proper design plays a big part in this. To make this a reality, beta testing has been underway since October 2018.  Our dedicated team has been diligently working on these new products for the past year”.

We’ve received a ton of interest from our customers and are very excited to finally deliver these new products, which represent a significant advance in the evolution of practical Magnetic Loop Antennas. For detailed descriptions and prices click on the links below:

Field Day Sale 10% off on all New Antenna Products (ends June 30, 2019)

The DPM6000A now measure picowatt to kilowatt levels with increased accuracy

Also introduced is the DPM6000A. It is a major upgrade with a more accurate source impedance circuit for the power reference to our popular lab-quality power meter. Said Stenbock “With the new DPM6000A any ham or learning institution can now afford  a 80 dB dynamic range, highly accurate lab quality power meter for design and home brewing”. While not an antenna product, it is useful for SWR, impedance and QRP measurements, for dedicated antenna experimenters, enthusiasts and home-brew measurement applications.

Please note: While we can take orders immediately, because of the Sea-Pac convention, we will not be able to ship any products until after the convention.

editorial contact: Roger Stenbock

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Black Friday Sale! New 60 meter resonator. Now advertising in QST.

New! 60 meter resonator
Now the PreciseLOOP  HG-1 Loop antenna covers the 60 meter band (5MHz) with the new 60 meter resonator. It works just as the 80 meter Resonator.  Just plug into the accessory input, and your Precise HG-1 Loop tunes over the entire 60 Meter band.

PreciseRF now advertising in QST
While the internet may be a good medium to promote product for the ham radio market, there is a lot of QRM. Many of our customers have encouraged us to promote our products using more traditional channels. As a result, we started to promote our product through Ham radio’s premier magazine, QST.


Roger W1RMS

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Columbus Day Sale on PreciseLOOP antennas and NEW PreciseLOOP field test video released

The PreciseLOOP is compared to a commercial portable dipole antenna. Covers deployment, tuning, SWR, radiation and field tests, showing gain and signal to noise ratio (SNR). Test conducted in the field at Placerville, CA.


To celebrate Columbus Day, we are offering all PreciseLOOP antennas at a BIG discount. Hurry, order right away. This sale is limited to the first 30 customers.











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PreciseLOOP Application Note Published

Application note and data sheet

New PreciseLOOP Appnote and Data Sheet.

In response to a number of inquiries from our customers, we have published an appnote covering the new PreciseLOOP antennas. In addition to a technical description, it also gives detailed information of the PreciseLOOP specifications.

Among the topics covered are maximizing gain, radiation patterns, loop current, SWR plots, comparisons to the dipole antenna, set-up and use and internet discussions. In makes an excellent adjunct to those using any loop antenna or to those considering buying one.





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FREE DPM6000 Power Meter Upgrade


Users of the popular DPM6000 Power Meter may have their unit upgraded FREE with new firmware (V2.40) and a minor mod in the log amplifier module to improve the frequency response flatness.

Units shipped prior to 9/1/17 only specified the frequency range (50KHz to 500 MHz) but not the frequency response. With this mod the frequency response can now be specified as: +/-  .5 dB from 50KHz to 250MHz for the FWD and REFL direct inputs.

To arrange your upgrade, please contact Audrie Crane from sales. We will pay shipping both ways (standard USP postage). We are committed to provide you the best possible products and thank you for your valuable feedback.



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PreciseLOOP Antenna and ultra fast PG50PS now shipping

Hi all,

We had a tremendous response to our new products at the SEAPAC ham radio convention at Seaside Oregon.

SEAPAC, Seaside, Oregon May 2017 – Our new PreciseLOOP antenna was a big hit.

We were caught a little off guard. As a result, we ran out of new product inventory very quickly. Our manufacturing capacity was recently upgraded and we are proud to announce all our new products are now in stock. See

Datasheet – Application note

Above, Audrie finishing a number of PreciseLoops and restocking the inventory.

The PreciseLoop antennas are Receive and Transmit Magnetic Loop Antennas (MLA)

To thank you for your patience, we have put most of our new products on sale. We appreciate your loyal patronage and wish the best throughout the year.


Roger W1RMS


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New Loop Antenna was a big Hit at SEA-PAC ham radio show.

If you attended the Seaside Oregon 2017 SEA-PAC ham radio convention, you may have seen our new products.  Many of you received a demo of our new Precise LOOP Magnetic Loop Antenna (MLA). The interest was intense. As a result, in under twelve hours, we sold out the entire inventory of Loop antennas, tripods, baluns and 80 meter resonators we brought to SEA-PAC. We are now busy replenishing and building another larger production run to fill the demand. We expect the next production quantity to be ready early July, 2017.  The introductory show prices were $399 for the Precise LOOP High Gain model and $299 for the Precise LOOP SOTA model. We will update our website to make them available directly online at the show price for a limited time. In the meantime, check for more information. Mag-loop-data-sheet2.pdf

Roger explaining the loop benefits

Eric Swartz WA6HHQ of Elecraft, using our new Precise Loop antenna

Eric Swartz WA6HHQ of Elecraft, is shown using our new Precise LOOP antenna in his booth. Eric was our very first Loop customer. He was very impressed with our loop and sent a number of customers our way.

Here Roger Stenbock W1RMS, is explaining the unique loop benefits and performance to some of the many hams stopping by our booth. The 45W higher power and 80 Meter option, available on the Precise LOOP High Gain model, was of particular interest to those wishing to operate at field day and HOA limited QTH locations.

The PG50PS was really well received and we sold a number to hams and home brew engineers. We received a lot of interest right away, some inquiries were from as far as Australia. The introductory and show price was $450. As soon as we get back to the office, we will update our website to make it available at the show price for a limited time directly online.  In the meantime, here is some additional information: PG50PS-datasheet2.pdf.

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PreciseRF Introduces three new product at the Seaside, Oregon SEA-PAC Show

We are excited to announce three new products at the Seaside Oregon SEA-PAC ham radio show. Call or visit us at our display in Seaside and check out these new products. We will have inventory in stock for immediate delivery.

The New PG50PS is an all new ultra high performance pulse/TDR generator for testing transmission lines, your scope and other test gear. The PG50PS TDR combines the pulse generator, the devise under test (DUT) and scope monitor outputs. This keeps the scope input at 50 ohms which allows for superior distance and impedance resolution and accuracy. TDR is the only way to check the entire length of a transmission line in one quick test.

Ultra fast open collector 50 ohms tr 35ps driver

DUT and SCOPE output tr 50ps

Internal 1MHz & external trigger

Compatible with Cable Radar (R)

PWR: External 9-14VDC, 9V Battery


The new precise Loop is available in two models, the High Gain LOOP and the SOTA Loop. The High Gain LOOP is optimized for perfomance and higher power, weighing 4 pounds. The SOTA Loop is optimized for QRP power, lower cost and lighter weight at 3 pounds.

These new Loop antennas raise the performance and value bar for the Magnetic Loop Antenna (MLA).  The preciseRF Loops are convenient, light weight antennas, which can be deployed quickly and are ideal for use in places where HOA restrictions make full size wire antennas impossible, or where there just is not enough room to erect a conventional antenna. Many operators favor the MLA for field day and SOTA operations.


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Happy 2017 – Let’s all make America Great again!

Wishing you a prosperous and healthy 2017.  Save Big! Many products on sale for the new year, including our popular new TDR-Cable Radar®

Introducing the new NEW TDR-Cable Radar® Pro 

The TDR-Cable Radar® Pro is a major upgrade to the discontinued CableScout.  The TDR-Cable Radar® Pro features an improved GUI, faster pulse rise time and all new firmware, making measurements simpler and quicker. It is an affordable precision TDR pulse generator with laboratory level accuracy and utility for transmission line measurements in ham radio installations. When used with an oscilloscope of sufficient bandwidth (100-200 MHz), measurements can be made rivaling those of commercial TDR systems at a fraction of the cost.

  • 110 ps rise time pulse width ≤350 ps
  • Reflection Coefficient (p)
  • Distance to Fault (DTF)
  • Return Loss (RL)
  • Line VSWR
  • Velocity factor (Vf)
  • Line loss dB/100ft @100MHz