5:1 Baluns/Ununs

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:

CU 5 1500 antenna - 5:1 Baluns/Ununs

Also available as a balanced output – CB-5-1500

1309885499 - 5:1 Baluns/Ununs
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Kenwood TS570, 590, 2000 Transceiver RFI Kit - 14 Noise Reduction Filters

RFI-Kenwood-590
$89.95
In stock
1
Product Details
MPN: RFI-ICOM-7300
Type: NEW
Country/Region of Manufacture: United States
Filter Power Rating (PEP watts): = Cable Rating
RFI Suppression Range (MHz): 1-300 MHz
# Ferrite Filters: 5
Enclosure Size (inches): n/a
Typical Use:: AC/DC power, RF output, 3 additional I/O lines

BUY THIS KIT NOW TO SOLVE YOUR RFI PROBLEMS! WORKS WITH MANY BRANDS OF HAM/COMMERCIAL HF RADIOS INCLUDING Kenwood TS570, TS590, TS2000 and many more Kenwood HF transceivers.

BUY THIS KIT NOW TO SOLVE YOUR RFI/EMI ISSUES - WORKS WITH MANY BRANDS OF HAM/COMMERCIAL HF RADIOS. Deluxe RFI Filter Kit for HF Radios with multiple antennas, computer interfaces, audio I/O lines.

Kit Includes 4 noise reduction ring filters for multiple antenna coax connectors, AC/DC power and 10 snap

on filters for I/O cables covering RFI range of 1-300 MHz.

Quick installation - immediate RFI/noise reduction. No radio mods required.

Purpose

The RFI kit is designed to be installed on your radio transceiver to reduce Radio Frequency Interference (RFI) caused by common mode current on the outside of the coax braid at the output of your radio and AC/DC power cable. Additional chokes are included to reduce common mode currents on 3 more transceiver cables including computer control, audio and another.

This kit will help reduce or eliminate:

1. “Hot mic” RFI caused by poor grounding of antennas or common mode currents from linear amps feeding unbalanced (coax fed) antennas without baluns/line isolators.

2. RFI to neighbor’s electronic devices including audio/video systems, computers, telephones, garage door openers, etc.

3. RFI to your other radios, audio/video systems, computers, telephones, etc.

A side benefit is a reduction in noise floor in your receiver depending on the amount of noise being introduced by common mode currents (which are blocked/reduced by the chokes in this kit).

These chokes use a special mix of ferrite core material that is effective in suppressing radio frequency interference from transmitters and high noise floor on receivers.

The split beads beads are easy to use, don’t require modification of the protected equipment and work in almost all cases, even when plug-in filters fail.

Use of the chokes often helps cure SWR problems between transceiver and a linear amp and between transceiver and antenna tuner or direct to antenna. The DC power line choke helps keep common mode current out of the power line which could cause interference to other devices connected to the same power line if not suppressed.

Included are the following chokes and installation guidelines:

Kit includes 4 large ferrite rings (1.4" ID) for RF antenna connectors, AC or DC input, large connector cables.

10 snap on (1/2" ID) connectors for computer interface, band switching, rotor control, and other cables.

If you use a linear amplifier buy an amplifier RFI kit for additional RFI interference suppression.

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