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Table of Contents
- 1 General Description
- 2 Specifications
- 3 Assembly
- 4 Reflector/Director Detail
- 5 Driven Element Bracket Assembly
- 6 Element Layout and Dimensions
- 7 VSWR Charts
- 8 Installation of Tubing Clamp
- 9 Tubing Clamps
- 10 10-Meter Traps
- 11 15-Meter Traps
- 12 Beta Match/Feedline Attachment
- 13 RF Choke
- 14 Parts List
- 15 Limited Warranty
- Download this manual
300 Industrial Park Road, Starkville, MS 39759
Ph: (662) 323-8538 FAX: (662) 323-6551
INSTRUCTION MANUAL
WARNING
Installation of this product near power lines
is dangerous. For your safety, follow the
installation directions.
General Description
The TH3JR-S antenna was designed for the Ham
who has space limitations but still wants top per-
formance on 10, 15 and 20 meters.
Forward Gain
Front-To-Back Ratio
VSWR at Resonance
Nominal Impedance
Power Capability (Transmitter Output)
Lightning Protection
Net Weight
Boom Length
Longest Element
Turning Radius
Wind Survival
Accepts Mast
Surface Area
Effective Moment*
Wind Load at 80 MPH
Hardware
Suitable Rotators
*Effective Moment is defined as the product of the antenna weight and turning radius.
Tri-band HF 3 Elements Beam
Covers 10, 15 and 20 Meters
The TH3JR-S is constructed of taper-swaged
aluminum tubing which offers low wind resis-
tance. It can be rotated with a heavy-duty TV
rotator. The light weight is ideal for rooftop or
lightweight tower installations. The antenna fea-
tures super strength stainless steel hardware and a
boom-to-mast bracket that will fit masts up to 2
inches in diameter.
Specifications
Electrical
Mechanical
Stainless Steel (except for U-Bolts and some small parts)
TH-3JRS
600 Watt PEP, 300 Watt AM
80 mph (128 kmph)
1 ¼" to 2" (32 mm to 51mm)
3.35 sq. ft. (0.32 sq. m)
310 ft. lb. (53 kg-m)
Hy-Gain AR-40 or CD-45II
Up to 8 dBi
25 dB
Less than 1.5:1
50 ohms
DC ground
21 lbs. (11.7 kg)
12 ft. (3.65 m)
27'3" (8.30m)
14'9" (4.49m)
87 lbs. (39.4 kg)
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Table of Contents
Related Manuals for Hy-Gain TH-3JRS
Summary of Contents for Hy-Gain TH-3JRS
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Page 1: General Description
310 ft. lb. (53 kg-m) Wind Load at 80 MPH 87 lbs. (39.4 kg) Hardware Stainless Steel (except for U-Bolts and some small parts) Suitable Rotators Hy-Gain AR-40 or CD-45II *Effective Moment is defined as the product of the antenna weight and turning radius. - Page 2 Assemble the two halves of the boom-to-mast Step-By-Step Assembly bracket by placing the 1/4" x 3/4" screws in the NOTE: When unpacking your antenna, check four outside holes as shown in Figure 1. DO the inside of all tubing for parts (clamps, in- NOT tighten at this time.
- Page 3 Figure 2 Reflector/Director Detail Slip the insulated end of the DE1 section into the Start at the reflector end (boom section that has driven element bracket and tighten securely. See the hole drilled in it) and measure approximately Figure 3 for proper installation. DO NOT tighten 1"...
- Page 4 Figure 3 Driven Element Bracket Assembly NOTE: At this time select your mode of transmis- Select R2 (3/4" x 10 1/2") and slip it onto the 10- sion - either Phone or Continuous Wave (CW). meter trap assembly. Slip one #6 tubing clamp on Refer to the dimensions for your mode of trans- each end of R2.
- Page 6 VSWR Charts These VSWR curves are typical for this antenna mounted 70 feet above ground, horizontally polarized. Similar curves can be expected for this antenna mounted at least 30 feet above ground. DO NOT try to tune this antenna for low VSWR at ground level. Figure 5 VSWR Charts Installation of Tubing Clamp...
- Page 7 A balun is not required for normal operation of 15-Meter Traps this antenna. However, there are three recom- Director - 15 DIR/REF mended feedpoint configurations, one of which Driven Element - 15 DE utilizes the Hy-Gain Model BN-86 balun for Reflector - 15 DIR/REF increased performance and convenience.
- Page 8 Figure 7 Beta Match/Feedline Attachment Figure 8 RF Choke...
- Page 9 SWR when used with this antenna. For best cable may be used if proper selection and careful results, use the Hy-Gain BN-86, 50 ohm balun. assembly are utilized. The feedline should be The Model BN-86 is available at your local Hy- stripped as shown in Figure 7.
- Page 10 PARTS LIST Item Part No. Description 190500 DE2, 3/4" x 9 1/2" ..….................2 176211 Boom (Reflector), drilled, 1 1/4" x 72" .............1 174992 Boom (Director), 1 ¼” x 72”…..............1 190202 Tube, swaged, 7/8" x 72"................6 871732 10-Meter Trap Assembly (Director) ............2 871733 10-Meter Trap Assembly (Reflector)............
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Page 11: Limited Warranty
Hy-Gain Warrants to the original owner of this product, if manufactured by Hy-Gain and purchased from an authorized dealer or directly from Hy-Gain to be free from defects in material and workmanship for a period of 12 months for rotator products and 24 months for antenna products from date of purchase provided the following terms of this warranty are satisfied.
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Do you have a question about the TH-3JRS and is the answer not in the manual?
Questions and answers
How can I check the traps. SWR has changed ans I think one or more of the traps is bad. Will a NanoVNA suffice?
To check the traps on a Hy-Gain TH-3JRS antenna using a NanoVNA, follow these steps:
1. Disconnect the trap from the antenna to test it individually.
2. Connect the trap between the NanoVNA’s two ports (Port 1 and Port 2), or use Port 1 with a return loss or S11 measurement.
3. Set the frequency range on the NanoVNA to cover the expected trap frequency (e.g., 14–30 MHz).
4. Measure the S11 or VSWR curve of the trap.
5. Look for a dip in the S11 or VSWR curve, which indicates the trap's resonant frequency.
Compare the measured resonant frequency with the expected design frequency for that band (10, 15, or 20 meters). A shift in frequency may indicate a fault or that tuning is needed.
This answer is automatically generated