5:1 CUBE™ Unun – Model CU-5-1500 (50:250 Ohm, 1.8-61 MHz, 1.5KW PEP)
Application. For traveling wave, end fed or portable 20-31 foot vertical antennas the 5:1 unun makes a good transformer for converting 50 ohm coax to a 250 ohm feed point. If you use the antenna on multiple bands, the feed point impedance may not always be 250 ohms and use of the unun at high (>350 ohms) or low (<100 ohms) will require reduced power input or the unun may have its power ratings exceeded and damage to the unun may occur. The (5:1 conversion ratio will change for loads other than 250 ohms unbalanced.
Typical application:
Also available as a balanced output – CB-5-1500
Preassembled Balun & Unun Boxes, Stainless Hardware - just add your ferrite choke or transformer
SKU CU-BOX-1-SO$29.951Save this product for later Customer reviews Reviews only from verified customersNo reviews yet. You can buy this product and be the first to leave a review.Share this product with your friendsPreassembled Balun & Unun Boxes, Stainless Hardware - just add your ferrite choke or transformerProduct DetailsWeather resistant PVC enclosure with top gasket, side feet for mounting to surface.
Side mounts increase width to 6" end to end, holes are 1/4", hole separation is 5.375"
These kits come in four different configurations depending upon the burpose of the balun/unun
Here are the part numbers and their contents
Part#
Description
Type
SEK
SSK
TEK
SO-239
CU-BOX-1-ES
SO-239 in, Top Eyebolt Hoist, Side Stud Output
Unun
1
1
1
CU-BOX-1SO
SO-239 in/out
Unun
2
CB-BOX-1-TS
SO-239 in, Top Studs (2)
Balun
2
1
CB-BOX-1-EB
SO-239 in, Top Eyebolt Hoist, Side Eyebolts (2) output
Balun
2
1
1
These kits are pre-assembled - just add your ferrite transformer. All parts can also be bought individually on the website, but you save a little with the pre-assembled kits shown here.
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Preassembled Balun & Unun Boxes, Stainless Hardware - just add your ferrite choke or transformer
Weather resistant PVC enclosure with top gasket, side feet for mounting to surface.
Side mounts increase width to 6" end to end, holes are 1/4", hole separation is 5.375"
These kits come in four different configurations depending upon the burpose of the balun/unun
Here are the part numbers and their contents
| Part# | Description | Type | SEK | SSK | TEK | SO-239 |
| CU-BOX-1-ES | SO-239 in, Top Eyebolt Hoist, Side Stud Output | Unun | 1 | 1 | 1 | |
| CU-BOX-1SO | SO-239 in/out |
Unun | 2 | |||
| CB-BOX-1-TS | SO-239 in, Top Studs (2) |
Balun | 2 | 1 | ||
| CB-BOX-1-EB | SO-239 in, Top Eyebolt Hoist, Side Eyebolts (2) output |
Balun | 2 | 1 | 1 |
These kits are pre-assembled - just add your ferrite transformer. All parts can also be bought individually on the website, but you save a little with the pre-assembled kits shown here.
