1101114670 - HF High Power Impedance Transformers

50:200 (4:1) CUBE™ Unun, 1.8-61 MHz, 1500/5000 Watts PEP, End Fed, Vertical, Monopole

Name: 50:200 (4:1) CUBE™ Unun, 1.8-61 MHz, 1500/5000 Watts PEP, End Fed, Vertical, Monopole
Brand: Palomar Engineers
SKU: CU-4-1500
Price: 119.95 USD
Availability: InStock

Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/50:200 ohm (4:1) Transformers

SKU CU-4-1500

$119.95

Bulk pricing available for quantities of 2 units or more

Power Rating (PEP)

1500 Watt PEP (1.8-61 MHz)

5000 Watt PEP (1.8-31 MHz)

5000+ Watts/ 4KW continuos (1.8-31 MHz)

Quantity:

Buy more, save more

Quantity	Price per item	Discount
2 items	$99.95	17% off
10 items	$94.95	21% off
50 items	$89.95	25% off
100 items	$79.95	33% off

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50:200 (4:1) CUBE™ Unun, 1.8-61 MHz, 1500/5000 Watts PEP, End Fed, Vertical, Monopole

Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/50:200 ohm (4:1) Transformers

Product Details

Input ohms/Output ohms: 50/100-400

Frequency Range < 2:1 SWR (MHz): 1.8-61 (1.5KW), 1.8-31 MHZ for 5000/5000HD

PEP Power Rating (watts): 1500/5000

Insertion Loss (dB): .15

Input Connector: SO-239

Output Connector(s): Wingnut/Eyebolt

Transformer Topology: Broadband Ferrite

Hardware Type: Stainless

Enclosure Size: 4" x 4" x 2"

Antenna Compatability: verticals, slopers, monopoles

Purpose. The CU-4-1500 is used as a 4:1 (200 ohm unbalanced load to 50 ohm unbalanced source) broadband transformer for 50 ohm coax cable rated at at 1500 PEP into 200 ohms unbalanced load from 1.8-61 MHz. Excellent for 31-33, 41 and 43 foot multi-band verticals and also slopers (51', 85' or 119" work great) made by S9, ZeroFive, MFJ and DX Engineering and Palomar Engineers vertical antennas

USE: The top connector is for the 200 ohm unbalanced output, and the side connector is for a ground rod, counterpoise or radial connection.The SO-239 input connector shield/ground is shared with the ground connector.

For best results use a feed line choke between the CU-4-1500 and the coax input to isolate the coax from becoming part of the antenna. Our Maxi-Choker (MC-1-3000) is an excellent companion for this unun.

This Unun is a very efficient match for many 43 and 31-33 foot multi-band verticals including the S9, ZeroFive, MFJ and DX Engineering vertical antennas.

The CU-4-1500 is also useful for end fed OCF antennas utilizing a 4:1 unun and a coax feed line choke to set the antenna length for the "short" side of the OCF.

CU-4-5000 is in a 4" x 4" x 2" NEMA enclosure and weighs 3 pounds and is specified for 1.8-31 MHz - rated at 5KW PEP

CU-4-5000HD is in a 4" x 4" x 4" NEMA enclosure, contains 50% more ferrite cores then the 5000 and weighs 4 pounds and is specified for 1.8-31 MHz - rated at 4KW continuous duty, 5K+ PEP. The HD version of this unun is CUSTOM MADE PER ORDER - PLEASE ALLOW 2 WEEKS FOR MANUFACTURING PRIOR TO SHIPMENT.

The high power ferrite impedance transformer series (> 1:1), configured with outputs to act as a baluns (unbalanced coax in to balanced load output) or as ununs (unbalanced coax input to unbalanced load output) are designed for demanding radio transmitter stations that run over 1,000 watts PEP or run continuous modes like AM, digital, RTTY, FM, etc. at high power levels. Radio contest operators, commercial shortwave broadcast, and industrial and commercial stations use these transformers for for a variety of balanced and unbalanced antenna loads. Baluns are typically used for balanced loads and antennas like dipoles, loops, log periodics, and direct feed yagi/beams. Ununs are used with verticals, end fed wires, horizontal dipoles, G5RV/ZS6BKW, Zepps, vertical wire beams, etc). All products are in an enclosed NEMA water resistant box with SO-239 input connector and stainless steel side/top studs with wing nuts or side and top eyebolts. The enclosure box has mounting “side feet” for attachment to a post or antenna boom using nylon ties.