PURPOSE
These kits are designed to choke common mode currents going into or exiting from your amplifier cables.Filters are supplied for the RF In, RF Out, Relay Cable/control lines, remote control unit and AC power line.Use of the filters often helps cure SWR problems between amp exciter and amp and between amp and antenna tuner or direct to antenna.The AC 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.
USE
KIT INCLUDES
|
Filter Type |
Usage |
Ferrites |
|
F240 Ring (1.4” ID) |
Transceiver RF coaxr |
1 |
|
Snap On (1/2” ID) |
Remote Control Unit cables |
5 |
|
Snap On (1” ID) |
RF Output, AC/DC power |
2 |
|
Total Filters |
8 |
INSTALLATION GUIDELINES
Amp RF Input:Ring Filter (1.4” ID) – 5-9 turns of RG-58/8X size through center
Amp RF Output:Snap On Filter (1” ID) – 3 turns of coax cable through center
RCU Cables:Snap On Filter (1/2” ID) – multiple turns through center
AC Power:Snap On Filter (1” ID) – 3 turns of power cord through center
50 ohm coax to 75 ohm balanced output baluns are useful for low (< 1 wavelength) dipoles exhibiting 75 ohm characteristic impedance or for matching to balanced ladder line whose endpoint impedance is near 75 ohms.
50 ohm coax to 75 ohm CATV coax connections are easily done with a 1.5:1 unun with SO-239 connectors on input and output. Likewise 50 ohm coax to unbalanced verticals or loads near 75 ohms can be matched with a 1.5:1 unun.