Home Theater RFI Kit

Bullet 50:450 (9:1) HF Balun, 1.8-61 MHz, 500/1500 Watts, T2FD, BBTD, ALE

Bullet-9B-500EB
$89.95
In stock
1
Product Details
Country/Region of Manufacture: USA
Type: NEW
Input ohms/Output ohms: 50 in, 450 out
Frequency Range < 2:1 SWR (MHz): 1.8-61
PEP Power Rating (watts): 500/1500
Transformer Topology: Braodband Ferrite
Hardware Type: Stainless Steel
Weight (pounds): 2
Antenna Compatability: T2FD, BBTD, ALE, Rhombic

The Bullet-9B is a multi-core balun with a compact enclosure (looks like a bullet) enclosure that is lightweight and easy to transport for your fixed/portable ALE, T2FD or BBTD antenna systems. Also useful for rhombics and other wire antennas needing balanced 450 ohm output. Halyard hoist at top of balun for convenient attachment point. Input is via SO-239 coax connector and output with side eye bolt output.Use a 500 ohm non-inductive termination resistor for the T2FD when using this balun.

This transformer requires a feed line choke to isolate the coax feed line from the antenna. A coax noise filter at the radio end of the coax is also recommended to reduce common mode noise current picked up by the coax braid.

Available in 500 watts and 1500 watt models



Remember we over engineer our products, to out perform our competition - just compare the weight of our baluns to theirs and you will know we put much more into our products so you don't have to worry about failure at a critical moment.


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TECH NOTE: We also stock RFI kits to protect effected devices such as garage door openers, computers (laptops, desktops), dsl/cable routers, ethernet hubs and many more devices. If you run a high powered RF amplifier in your ham station also consider a linear amp RFI kit which will cut down RFI transmitted by your station. Remember there is always a “transmitter” and a “receiver” of RFI and the quest is to find and choke the “path” the RFI has selected – you need to add ferrites to both the transmitting side and the receiving side to eliminate RFI problems. The RFI-HTS kit only helps suppress RFI on the receiving side.

Typical RFI Problem/Solution:

Hello,
I am Larry, a ham operator and I am having interference issues with
my Direct TV system.
My station is a FT450D through an Ameritron ALS-600. From the amp
through a coax switch  to choose between an OCF dipole or an Hustler
5BTV vertical. Any power over 100 watts and my DTV goes off the air
and must completly reboot/format. Coax is RG-8. The DTV dish is
pointed away from the dipole and separated by about 25'. DTV was
totally useless! They suggested I not talk on the radio while she is
watching TV!  Please help me with a reasonable, cost effective
soultion. (The wife gets really pissed when I shutdown the tv!)

Thank you,

Larry 

 

Hi Larry,

Your RFI problem is quite common and is usually a sign of either a radiating coax feed line or reception of your radiated signal (source) by the Direct TV (the victim) through either the AC power lines acting as “antennas” for your ham signal or the coax braid of the satellite antenna acting as an antenna for your signal.

The solutions are straight forward:

1. To make sure your feed line is not radiating you need a feed line choke at each antenna feed point (also makes your antenna work better since it is not using the coax as part of the antenna).  You can use our simple Kit 110 with 5 snap on chokes on each antenna for this purpose.  Part # Kit 110 at $27.50 each – one for each antenna.  These chokes will keep your feed line from radiating and coupling into your ac power lines.  INFO HERE

2. The radiation from your antennas themselves may also be getting into the ac power lines and coax braid of the Direct TV antenna so you need to protect the victim receiver.  Depending upon the sophistication of your direct TV setup (e.g. home theater, dvd, tape player, sub woofer speakers, etc), the path of the RFI may be coming thru the AC power lines of any connected device to the video including the video monitor itself!  To help solve this problem we have a home theater RFI kit for up to 5 devices (you need a minimum of two – one for the Direct TV receiver(AC and coax input) and another for the video monitor AC power lines and HDMI or video input cable.  Our kit part # is RFI-HTS.  INFO HERE

These items should help reduce the RFI and let you operate on the air while your wife watches TV.

Bob Brehm, AK6R

Chief Engineer