VIBROPLEX EF-40QRP 40M End Fed Half Wave Antenna Instruction Manual
- June 9, 2024
- VIBROPLEX
Table of Contents
EF-40QRP 40M End Fed Half Wave Antenna
Product Information: ENDFEDZ EF-40QRP 40M END FED HALF WAVE ANTENNA
The ENDFEDZ EF-40QRP is a mono band antenna designed for use on the 40 meter band. Using the antenna on bands other than the design band may result in significant coax radiation and can damage the matchbox. The package includes the EF-40QRP antenna, PL-259 to BNC male adapter, end insulator, tuning stub, and this manual. ENDFEDZ ARE MONO BAND ANTENNAS. USE ON BANDS OTHER THAN THE DESIGN BAND WILL RESULT IN SIGNIFICANT COAX RADIATION AND MAY RUIN THE MATCHBOX
Specifications
- Polarity: Depends on mounting configuration
- Design Z: 50 Ohms
- Frequency of operation: 7-7.3 MHz
- V.S.W.R. Bandwidth: 225 kHz 2:1
- Power Handling: 25 watts SSB/CW, 12.5 watts digital
- Weight: 6 ounces
- Length: 65’6″
- Hardware: Stainless Steel
- Connector: Silver/Teflon SO-239, PL-259 to male BNC adapter included
- Radiator: #22 AWG Poly Stealth
Product Usage Instructions
- The EF-40QRP antenna should be suspended horizontally, vertically, or sloping. For portable operation, you can hang the far end from a tree limb and let the matchbox hang just above the ground.
- Insulated lines are recommended for attachment to the insulators to have the least possible influence on the antenna.
- The antenna can be used from hotel rooms by hanging the matchbox end just outside the window and letting the far end hang. It’s preferable to pull it away from the building with a guy attached to the end insulator.
- Once you are satisfied with the overall length of the radiator, lace the wire and tie off a support rope through the provided insulator.
- Refer to Fig. 1 for mounting ideas.
For further inquiries or assistance, please contact Vibroplex LLC via phone at 865-309-5073 or email at vibroplex@vibroplex.com. You can also visit their website at www.vibroplex.com.
PACKING LIST OF INCLUDED ITEMS
- EF-40QRP antenna
- PL-259 to BNC male adapter (to use BNC-equipped coaxial cable if desired)
- End insulator, manufacturer Spiderbeam
- Tuning stub
- This manual
ASSEMBLY
- This antenna is essentially a half-wave dipole with one important difference– the feedline is at the end of the antenna.
- In order to have the least possible influence on the antenna, insulated lines are recommended for attachment to the insulators. The antenna may be suspended horizontally, vertically or sloping. Portable operation is easily accomplished by suspending the far end from a tree limb and letting the matchbox hang just above the ground.
- The antenna has been used in hotel rooms by hanging the matchbox end just outside the window and letting the far end hang or preferably pulling it away from the building with a guy attached to the end insulator.
- Tuning is best accomplished by using an antenna analyzer attached to the far end of the coaxial cable that will be used with the antenna. Once the initial resonant frequency is established, the antenna may be tuned just like a dipole. Shortening the far end by 6” will raise the resonant frequency to approximately 25 kHz. Trim or (better) fold the wire back on itself and wrap to shorten the antenna. If too much wire is removed, the included tuning stub may be attached to the stud at the matchbox end and trimmed to establish resonance to the desired frequency. Fine-tuning may be accomplished by changing the orientation of the stub with regard to the main radiator (I.e. rotating the stub and retightening the hardware) and Tightening the hardware just enough to compress the lock washer.
- Once you are satisfied with the overall length of the radiator, lace the wire and tie off a support rope through the provided insulator.
- Fig. 1 illustrates some mounting ideas.
EndFedz ® Vibroplex LLC 1001 N. Broadway St.
Knoxville, TN 37917
865-309-5073
www.vibroplex.com
vibroplex@vibroplex.com
References
Read User Manual Online (PDF format)
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