Bullet 50:450 (9:1) HF Unun, 200 KHz-30 MHz, 500 Watts, End Fed Antennas, , VLF, SWLProduct DetailsBrand: Palomar EngineesUPC: Does not applyMPN: Bullet-9Type: NEWCountry/Region of Manufacture: USAThe “Bullet” End Fed Antenna Matcher - Low Frequency Model Bullet-9LF, Ham and Short Wave Listener
The key to end fed antenna success is the matching network interface between the long wire antenna and the coax feed line and feed line choke at the transceiver. Palomar Engineers Bullet-9LF employs a dual core matching system that offers wide bandwidth down to 20 KHz (.02-31 MHz), 500 watt PEP rating, and a connection for a counterpoise or ground if desired.
The antenna can be used as a sloper, “L” with a vertical section and a
longer horizontal section, or as a random horizontal antenna between
two trees or supports.
Our network matching network is called the “Bullet” because of it shape and its effectiveness at taking down or contacting distant (DX) stations all over the world under the right conditions. The Bullet uses all stainless steel connectors and a dual core ferrite 9:1 unun for higher power rating then many competitive products.
We sell the Bullet separately so you can add you own wire type and length (see table of suggested lengths below) or you can purchase a complete antenna system including wire and end insulator.
For best results we recommend that the coax feed line be at least 1/4 wavelength on the lowest operating frequency since the coax braid is used as a counterpoise if you don’t use the external counterpoise terminal on the matching unit. We also recommend a feed line choke at the end of the coax feed line near the radio to prevent RFI common mode current from interfering with the radio. The BA-58 (slip on) or Kit 105 (snap on) sleeve chokes or simply a EFFLC choke with 10 turns of the coax line on RG-8X (1/4″ cable) typically used for low power operations.
Suggested wire lengths for 1-31 Mhz operation (measured from Bullet wire point):
Bands Covered (meters)
Wire Length (feet)
Minimum Coax Length (feet)
40-30-20-15
35-43, 49-63, 70-85
35
40-30-20-17
35-45, 54-64, 67-77
35
40-30-20-17-15-12-10
38-44, 55, 60, 68-73
50
80-40-30-20-17-15-12-10
68-73, 85, 92, 102, 120-125
65
160-80-40-30-20-17-15-12-10
135, 141, 173, 203
130
If you run more than 500 watts PEP and need a high power 9:1 unun for your end fed antenna, check out the 1-7.5KW PEP ununs on the 9:1 impedance transformer page in our website at http://Palomar-Engineers.com .
Installation
For best results raise the Bullet matching unit as high as possible (use a tree or vertical support) and then extend the antenna wire horizontally or as an “L” (horizontal with vertical end drop).The antenna may also be deployed as a sloper with the Bullet matching unit at the top (best) with the wire sloping toward the ground (with the end high enough to avoid contact by humans or animals), or at the bottom of the sloper with the antenna wire rising to a higher point (see typical configurations below).
Additional Typical Antenna Configurations:
Antenna Length Modifications: For best results, chose a length from the table above as these lengths will form a non-resonant antenna for the amateur bands indicated.The antenna length should NOT be ¼, ½ wavelength on any frequency that you transmit as the impedance will be very high (or low) and will not transfer through the matching unit at a favorable impedance to your antenna tuner.The theory of the antenna length is to make the antenna non-resonant on any amateur band so that the impedance at the antenna side of the matching unit is in the range of 200-600 ohms and when divided by 9 will be in the range of your transceiver antenna tuner.
Any length of 50/75 ohm feed line ok (over 35 feet minimum) but longer feed lines over 50 feet may show reduced SWR on some bands due to soil conductivity, nearby objects, etc. Due to local ground conditions, antenna height and feed line length, SWR may vary and an antenna tuner may be required or some bands to bring SWR at end of feed line to acceptable levels.Use of one or more ¼ wavelength counterpoise(s) connected to the ground post of the matching unit may also improve antenna efficiency and reduce SWR on certain bands.The first counterpoise should be installed under the horizontal portion of the antenna for best results
Use a good quality 50/72 ohm cable adequate for the power level of your station.The Bullet-80 matching unit is rated for 500 watts PEP for SSB and 150 watts continuous carrier for AM, FM, digital modes, or 375 watts CW.If the matching unit becomes warm to the touch after transmitting at high power, reduce the power output or the internal matching unit may become damaged.
NOTE: due to the nature of antenna systems and the modifications many users perform and the transmitter power levels that may be applied higher then the specifications, the antenna systems are NOT RETURNABLE unless they are unused, in the original packing with the original invoice and a return request is made withing 30 days of original purchase.
On Sale
50:450 ohm (9:1) CUBE™ Unun, 1.8-61 MHz, 1.5 KW, End Fed Long Wire50:450 ohm (9:1) CUBE™ Unun, 1.8-61 MHz, 1.5 KW, End Fed Long WireSKU CU-9-1500List price $129.95 Save 15%$109.95
The “Bullet” End Fed Antenna Matcher - Low Frequency Model Bullet-9LF, Ham and Short Wave Listener
The key to end fed antenna success is the matching network interface between the long wire antenna and the coax feed line and feed line choke at the transceiver. Palomar Engineers Bullet-9LF employs a dual core matching system that offers wide bandwidth down to 20 KHz (.02-31 MHz), 500 watt PEP rating, and a connection for a counterpoise or ground if desired.
The antenna can be used as a sloper, “L” with a vertical section and alonger horizontal section, or as a random horizontal antenna between
two trees or supports.
Our network matching network is called the “Bullet” because of it shape and its effectiveness at taking down or contacting distant (DX) stations all over the world under the right conditions. The Bullet uses all stainless steel connectors and a dual core ferrite 9:1 unun for higher power rating then many competitive products.
We sell the Bullet separately so you can add you own wire type and length (see table of suggested lengths below) or you can purchase a complete antenna system including wire and end insulator.
For best results we recommend that the coax feed line be at least 1/4 wavelength on the lowest operating frequency since the coax braid is used as a counterpoise if you don’t use the external counterpoise terminal on the matching unit. We also recommend a feed line choke at the end of the coax feed line near the radio to prevent RFI common mode current from interfering with the radio. The BA-58 (slip on) or Kit 105 (snap on) sleeve chokes or simply a EFFLC choke with 10 turns of the coax line on RG-8X (1/4″ cable) typically used for low power operations.
Suggested wire lengths for 1-31 Mhz operation (measured from Bullet wire point):
|
Bands Covered (meters) |
Wire Length (feet) |
Minimum Coax Length (feet) |
|
|
40-30-20-15 |
35-43, 49-63, 70-85 |
35 |
|
|
40-30-20-17 |
35-45, 54-64, 67-77 |
35 |
|
|
40-30-20-17-15-12-10 |
38-44, 55, 60, 68-73 |
50 |
|
|
80-40-30-20-17-15-12-10 |
68-73, 85, 92, 102, 120-125 |
65 |
|
|
160-80-40-30-20-17-15-12-10 |
135, 141, 173, 203 |
130 |
If you run more than 500 watts PEP and need a high power 9:1 unun for your end fed antenna, check out the 1-7.5KW PEP ununs on the 9:1 impedance transformer page in our website at http://Palomar-Engineers.com .
Installation
For best results raise the Bullet matching unit as high as possible (use a tree or vertical support) and then extend the antenna wire horizontally or as an “L” (horizontal with vertical end drop).The antenna may also be deployed as a sloper with the Bullet matching unit at the top (best) with the wire sloping toward the ground (with the end high enough to avoid contact by humans or animals), or at the bottom of the sloper with the antenna wire rising to a higher point (see typical configurations below).
Additional Typical Antenna Configurations:
Antenna Length Modifications: For best results, chose a length from the table above as these lengths will form a non-resonant antenna for the amateur bands indicated.The antenna length should NOT be ¼, ½ wavelength on any frequency that you transmit as the impedance will be very high (or low) and will not transfer through the matching unit at a favorable impedance to your antenna tuner.The theory of the antenna length is to make the antenna non-resonant on any amateur band so that the impedance at the antenna side of the matching unit is in the range of 200-600 ohms and when divided by 9 will be in the range of your transceiver antenna tuner.
Any length of 50/75 ohm feed line ok (over 35 feet minimum) but longer feed lines over 50 feet may show reduced SWR on some bands due to soil conductivity, nearby objects, etc. Due to local ground conditions, antenna height and feed line length, SWR may vary and an antenna tuner may be required or some bands to bring SWR at end of feed line to acceptable levels.Use of one or more ¼ wavelength counterpoise(s) connected to the ground post of the matching unit may also improve antenna efficiency and reduce SWR on certain bands.The first counterpoise should be installed under the horizontal portion of the antenna for best results
Use a good quality 50/72 ohm cable adequate for the power level of your station.The Bullet-80 matching unit is rated for 500 watts PEP for SSB and 150 watts continuous carrier for AM, FM, digital modes, or 375 watts CW.If the matching unit becomes warm to the touch after transmitting at high power, reduce the power output or the internal matching unit may become damaged.
NOTE: due to the nature of antenna systems and the modifications many users perform and the transmitter power levels that may be applied higher then the specifications, the antenna systems are NOT RETURNABLE unless they are unused, in the original packing with the original invoice and a return request is made withing 30 days of original purchase.
Christmas lights or yard lights with switching DC power supplies are often the RFI source and a clamp on ferrite bead on the AC AND the DC side feeding the lights is needed to help suppress the switching power supply RFI noise. Suitable snap on beads are FSB31-1/2 for the 1-250 MHz range.
We have also had reported wireless HDTV boxes, and FOSCAM and AMCREST security camera systems causing RFI to garage door remote openers. Use our Garage Door Opener RFI kit to suppress the interference to the opener (VICTIM) – you need one kit for each opener. Maximize the distance from the camera to the openers may also help. Additionally shield cable to the garage door sensors may be needed depending on severity of the camera RFI.
Obvious Tech Note: make sure your remote batteries have enough energy to activate the GDO or the signal they transmit may not be large enough to over ride the RFI signal, but a fresh battery may be able to overcome the weak RFI source and allow the GDO to operate correctly.