*** The SHUNT-100 was installed on AA1NZ's Hi-Q antenna when he won first place in an antenna shootout! ***
"SHUNT-100" Unique Weather Resistant Adjustable Load Inductor
The SHUNT-100 is used to adjust the SWR of your antenna system at resonance on the 160 and 80 meter bands where you need additional inductance to increase the impedance / reduce the SWR at resonance. Once adjusted it does NOT have to be re-adjusted for the other HF bands, 160 through 10 meters. Readjustment may only be needed if you change your antenna characteristics, such as add a different length whip or capacity hat.
It is compact in size (see photo below) and comes in a weather and sunlight resistant gray PVC housing, with stainless steel and Type 6061 aluminum hardware. This may be the only shunt inductor that comes in a weather resistant case! To access the coil for adjusting, you simply remove two stainless steel screws that hold the access panel. Under the panel is a rubber gasket for weather proofing.
Inside is a tin plated 99% pure copper 14 gauge solid wire coil with silver plated contact for adjusting. It mounts to the ground bolt on the UHAM-150 mount or can be used with ANY BRAND mount, where your SWR is too high on the lower HF bands. The aluminum mounting plate (1x 1/8x 3 inches) includes a 1/4" diameter hole for mounting to your ANY BRAND mount and it can be rotated in any direction to meet your specific needs. On our UHAM-150 (or UHAM-100) mounts, the bracket bolts under the 1/4x20 ground bolt and you can still use the wing nut on the UHAM mount to connect your ground cable to the UHAM.
To adjust the SHUNT for your specific installation, tune your radio and antenna to the lowest frequency you will use, on 160 or 80m. Loosen the clip screw and try various coil taps until your SWR is low. Tighten the clip screw and re-check. You can fine tune the SWR by spreading the coil windings closer or farther apart. Check the next higher band (if tuned on 160m try 80m). Then try all other bands through 10m. The SHUNT should not affect bands higher than 80 or 40m and once tuned you should be set for all HF bands and will not need to retune the SHUNT for different bands. Of course your antenna must be able to resonate on the desired bands (although at high SWR on the low bands without the SHUNT) as no inductor will help your antenna if it will not resonate.
The SHUNT has been tested at 100 watts on 160m through 10m. It should work well above this power level but we only claim actual results - if anyone would like to test it on higher power please contact us for a discount and the results will be reported on this web site.
To download the SHUNT-100 Installation manual click > SHUNT-100 MANUAL .To view the warranty click > WARRANTY
Product photos are shown below with dimensions. For more REP Design photos click > PRODUCT PHOTOS .
Replacement parts are available as our products are blue printed. If you do not see a part on our web site just contact us. Click > ACCESSORIES AND PARTS
TO ORDER please go to the bottom of this page, after the photos.
Several photos are shown below to illustrate the appearance, dimensions and installation examples. One of the photos also shows "what you get" - this photo is labeled accordingly.
The photo below shows what you get: the gray PVC housing, access panel to adjust the inductance, aluminum mounting plate ("ground") and stainless steel wing nut for connecting to your antenna. The other screws are stainless steel. The mounting bracket is 6061 aluminum.
The photo below shows the dimensions of the SHUNT-100 and where it is connected to ground and to your antenna.
The photo below shows the coil (#14, tin plated , 99% pure copper solid wire) and silver-plated coil clip with the screw used to tighen the clip to the coil that gives the lowest SWR on your lowest band of operation. The coil is easy to access, by removing the panel with two stainless steel screws.
The photo below shows the weather proofing that is designed into the SHUNT-100.
The photo below shows an example installation of the SHUNT-100 mounted to a powder coated UHAM-150 mount (antenna V-clamp removed) with the optional SHD-SO239 coax connector antenna mounting system. A coax "tee" is plugged into the SHD-SO239: the coax to the radio is shown on the left side of the photo (with one of several Mix 31 ferrite bead filters) and the single wire (14 gauge, stranded) connecting the SHUNT-100 is also shown. Please note that the coax, coax plugs, "tee connector, and single wire are not included, as they are standard parts that you may already have.
The photo below shows what the SHUNT-100 looks like close-up on the UHAM-150 mount. Please note that you need to provide your own wire connection from the SHUNT to your antenna. You only attach a single wire (#14 guage stranded works fine) from the set screw on the SHUNT to the hot part of your antenna - via a PL-259 "tee" (shown in photo) or solder lug connected to the bottom of the 3/8x24 stud that holds the base of your antenna.
The photo below shows how the SHUNT-100 looks on a bare aluminum UHAM-150 mount, from the rear. As you can see it looks sleek and does not detract from the appearance of your antenna or vehicle. In this example, the SHUNT is connected to the antenna with a PL-259 "tee" connector into the optional SHD-SO239 connector/antenna mounting assembly.
The photo below is from Tom, AA1NZ, who won FIRST PLACE in an antenna shoot out. His top-notch installation includes a large Hi Q Antennas 5/160 mounted on the ROOF of his cross-over. Note that the SHUNT-100 was used on this antenna when he won! More photos from Tom are on our Customer Feedback/Photos page, click > CUSTOMERS.
Prices and Purchase:
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We can ship overnight or by other methods as requested. If you would like special shipping, please call or email us for a quote, by clicking > CONTACT US .
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NEW! We are now offering significant discounts for customers who order a UHAM-150 mount with one or more of our other products, click > PACKAGE DEALS .
