AX4 100 W, 40-10 M PORTABLE ANTENNA - JOIN THE AX4 WAITLIST!
TAKE YOUR ADVENTURES TO THE NEXT LEVEL WITH THE NEW AX4!
Our 4’ (1.2 m) whips are great for ultraportable outings. But when you need more punch...answer the call of the wild with the rugged AX4. Perfect for picnic table or tripod mounting in wind-swept terrain, the 8’ (2.5 m) AX4 boosts your signal as much as 6 dB.
The AX4 is supplied with four 13' (4 m) radials, providing an efficient, symmetrical, and no-tune counterpoise. Resonant frequencies are ~7, 10, 14, and 21 MHz. A wide-range ATU, e.g. those in all Elecraft transceivers, handles final matching. Our versatile AXTC4 table clamp (see photos) bolts directly to the whip base.
An antenna matching device (such as an ATU) is required with the AX4 for impedance matching. Resonances in the 7, 10, and 14 MHz jumper block settings fall in or near the 40, 30, and 20 meter ham bands, though frequencies may shift due to ground characteristics, radial wire length and placement, etc. The fourth setting, 21 MHz, is for use on 15 m, as well as 17, 12, and 10 meters with a wide-range ATU. Elecraft transceivers include optional built-in ATUs that have the required range. NOTE: When using whip antennas above QRP power levels, especially on non-resonant bands, a balun may be required to keep coax shield radiation from interfering with your transceiver. The Elecraft BL3 is specifically designed to allow power of up to 100 W CW/SSB (50 W DATA) to be used with the AX4.
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Specs
Resonant Frequencies~7 MHz (40 m), ~10 MHz (30 m), ~14 MHz (20 m), ~21 MHz (15 m). The 21 MHz band jumper setting is used for 17, 12 and 10 m. Note: An ATU is required in all cases. The ATU compensates for actual inductances, height above ground, radial length / deployment angle, coax length, and ground characteristics. With per-band tuned radials, ATU SWR matching range needed is typically < 3:1 on resonant bands and < 8:1 on non-resonant bands (17, 12, and 10 m). All Elecraft transceiver internal ATUs and the Elecraft T1 ATU have sufficient range. Radial WiresOne 16’6” (5 m) radial wire is supplied for use on 20 m. To optimize performance, attach a tuned radial for each additional band used, where L (feet) = 234 / F, or L (m) = 71.3 / F. Deploy radials above ground if this can be done without creating a tripping hazard. All radials must be attached to the AX4’s ground, not the transceiver’s. Connect the BL3 directly to the AX4, and run coax from the AX4 to the transceiver. Note: Tuned radials are required above 20 W to minimize RFI and balun heating. Max. Power100 W CW/SSB, 50 W data/AM/FM. If RFI symptoms are observed at the transceiver or at an attached computer, reduce power, increase coax length, or use a high-isolation balun, e.g. an Elecraft BL3. The BL3 is optimized for high isolation on all AX4 bands. If SWR increases during transmit, reduce power to avoid excessive balun heating. ConstructionCorrosion-resistant whip and hardware; nylon base unit with acrylic toroid cover; high-Q inductors (T94-6) wound with high-temp enamel wire. DimensionsWhip: 13.3” (34 cm) collapsed, 8’ 2” (2.5 m) extended. Base: 7.5” (19 cm) long. AXTC4 table clamp: 5.8” (15 cm) long; max table thickness, 3” (7.5 cm). BL3 balun, 4” L x 2” W x 1.3” H (10 x 5 x 3.3 cm). WeightAX4 base unit, 8.8 oz. (250 g); whip: 3.8 oz. (108 g); AXTC4 table bracket, 3.6 oz. (100 g); BL3 balun, 4.0 oz. (113 g).
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Accessories
The new BL3 Balun is not yet available for purchase. Following its introduction at Dayton Hamvention, we are now beginning the process of sourcing materials and preparing for production and assembly. We appreciate your patience and will announce availability as soon as the BL3 is ready to order.