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This soon-to-be-classic design blends the simple functionality of a wire J-pole with the durability and flexibility of CPVC construction. With low SWR across both bands, light weight and durable construction, this antenna is an excellent solution for many applications. Bicyclists will appreciate having dramatic HT performance increases with very little added weight.QuickLink to Pricing and Ordering |
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The antenna starts off as a twin-lead wire J-Pole, adjusted for the additional capacitance of the CPVC radome. |
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Here is the completed internal assembly with 6 ft. length of RG58 installed. Coax length and connector can be customized for your application. For those of you with SMA antenna connectors, check out Stephen Gulyas' excellent adapters at: |
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Then the radome is constructed and painted. Many options are available for color, depending on the application. Flat black matches most bike racks whereas gloss white is best for Marine applications. | ||||||||||
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The internal assembly is then inserted into the radome and sealed against the elements. Here is the finished antenna assembly, shown inverted. |
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Next the mounting assembly is created from a 9" CPVC
stub and a special 90 degree threaded CPVC elbow.
NOTE: the base station version uses a vertical stub (not shown) or the triangle base. |
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Here are two "standard" mounting assemblies, along with a "triangle" assembly. The triangle is best for deck or patio railings where it can be mounted with screws or simply zip tied to a railing. The base station version uses a vertical stub (see below), which is perfect for mounting to a mast. |
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There are many ways to mount the antenna. This simple example involves just zip tying the mounting base to the rack. This is the fastest and easiest method. For a more enduring mount, stainless bolts, nuts and lock washers could be used. | ||||||||||
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Once the antenna base is mounted, the coax can be routed to the front of the bike and into a bar bag, or wherever it is required. As you can see, the finished assembly is very clean. The rack bag still fits over the mounting base and the coax length is perfect. |
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Here's a look at the base station version as it is attached to a 5' mast pole with U-brackets. The Base comes with a standard 12' coax but can be made to order with any length you desire. | ||||||||||
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The mounting stub keeps the entire radiator above the mast, brackets, etc. |
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Here's the antenna installed on my house for use with my packet station. The weather-tight nature of the antenna makes it a great "set it and forget it" choice. | ||||||||||
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The performance/cost ratio of this antenna rivals any commercial unit on
the market today.
You won't be disappointed. |
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Great for bikes, boats, scooters, wheelchairs and even to keep on the deck for those Summer evening QSO's with the HT on low power. The JDuck also makes a nice spare for the trunk! Pricing:
I can modify the JDuck to meet your specific needs. Email or call to place an order or if you have any questions. N8RPD@MrPCHead.com or 201-910-4192 73 de N8RPD |
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