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This Item  Balun One Nine v1 - Tiny Low-Cost 1:9 HF Antenna Balun and Unun with Antenna Input Protection for Ham It Up, RTL-SDR, HackRF and Other HF-Capable Radios. Great for DIY Dipole and Longwire Antennas |  |  |  |  |  | |
| Price | -25% $14.95 List: $19.95 | $24.95 | $158.99 | $12.96 | $11.97 | $39.99 |
| Delivery | Get it as soon as Tuesday, May 14 | Get it as soon as Tuesday, May 14 | Get it as soon as Tuesday, May 14 | Get it as soon as Thursday, May 16 | Get it as soon as Tuesday, May 14 | Get it as soon as Wednesday, May 15 |
| Customer Ratings | ||||||
| Value for money | ||||||
| Sold By | Nooelec | Nooelec | GOOZEEZOO | Naideys | Youluu | DotDotTech |
| number of channels | — | — | 8 | 9 | — | 1 |
| antenna description | Radio | Radio | Radio | Television | Radio | Radio |
Reviews with images
One side to wire, one side to ground. Which one?
Interesting piece of hardware for using a random-length wire with an SDR-RTL but there's more to this.First, this is not, technically, a BALUN (BALanced-UNbalanced line transformer), but a UNUN (UNbalanced-UNbalanced line transformer)The picture I've added shows a standard circuit diagram for a 9:1 UNUN. You'll notice a couple things about this. First, how SMALL the NooElec unit is. Second, one side - the UNbalanced side - has twice as much impedence as the side to ground. This makes a difference. Your VSWR is lower when wired right (I tested it with a SARK 110 vector analyzer, a "random" 36 foot piece of 22 gauge jumper wire - see the other two pictures attached, the one marked CSV_001 is wired correctly, CSV_000 is wrong). While the differences are small in my example, other wire lengths at other frequencies can make a HUGE difference. The side with the paperclip goes to ground.You can test this out yourself if you look at the circuit diagram. One connector shorts directly to ground. The other side has some impedence. I measured - roughly - 5 Ohms with a Fluke 118B digital multimeter).From Balun designs dot com:How long a wire to use? While you CAN use a "random wire", 100 years or so of Hams experimenting and calculating have figured this out for you - it's settled science although things like height of the wire above ground and its proximity to telephone wires or home wiring will alter VSWR too so your lengths may need to be a little different. The effects on receive may be marginal on some frequencies depending on your wire length but can make a huge difference on others; transmitting with very high VSWR can be impossible or damage the transmitter, but, since we're not using this particular UNUN for a transmitter, this is FYI only.Balun Design dot com has a link to a wire length chart you may find useful (fourth picture):http://www.balundesigns.com/content/Wire%20Lengths%20for%204%20and%209-1%20ununs.pdf "unun should be used with the wire lengths listed in the table shown in the above link. Use of the 9132 for "random" wire lengths, other than shown, can potentially create an impedance that is too high for an ATU to match. If a wire length not shown in the table is installed, an antenna analyzer should used to determine the actual feedpoint impedance that will require matching for each band of operation.""Ununs are intended for use with unbalanced antennas such as verticals and long wires. They will not work with balanced designs such as dipoles or loops and use with a balanced antenna may cause erratic operation and/or damage to the unit."One side to wire, one side to ground.Hope this helps.
Top reviews from the United States
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Reviewed in the United States on July 18, 2023
Reviewed in the United States on December 22, 2015
First, this is not, technically, a BALUN (BALanced-UNbalanced line transformer), but a UNUN (UNbalanced-UNbalanced line transformer)
The picture I've added shows a standard circuit diagram for a 9:1 UNUN. You'll notice a couple things about this. First, how SMALL the NooElec unit is. Second, one side - the UNbalanced side - has twice as much impedence as the side to ground. This makes a difference. Your VSWR is lower when wired right (I tested it with a SARK 110 vector analyzer, a "random" 36 foot piece of 22 gauge jumper wire - see the other two pictures attached, the one marked CSV_001 is wired correctly, CSV_000 is wrong). While the differences are small in my example, other wire lengths at other frequencies can make a HUGE difference. The side with the paperclip goes to ground.
You can test this out yourself if you look at the circuit diagram. One connector shorts directly to ground. The other side has some impedence. I measured - roughly - 5 Ohms with a Fluke 118B digital multimeter).
From Balun designs dot com:
How long a wire to use? While you CAN use a "random wire", 100 years or so of Hams experimenting and calculating have figured this out for you - it's settled science although things like height of the wire above ground and its proximity to telephone wires or home wiring will alter VSWR too so your lengths may need to be a little different. The effects on receive may be marginal on some frequencies depending on your wire length but can make a huge difference on others; transmitting with very high VSWR can be impossible or damage the transmitter, but, since we're not using this particular UNUN for a transmitter, this is FYI only.
Balun Design dot com has a link to a wire length chart you may find useful (fourth picture):
http://www.balundesigns.com/content/Wire%20Lengths%20for%204%20and%209-1%20ununs.pdf
"unun should be used with the wire lengths listed in the table shown in the above link. Use of the 9132 for "random" wire lengths, other than shown, can potentially create an impedance that is too high for an ATU to match. If a wire length not shown in the table is installed, an antenna analyzer should used to determine the actual feedpoint impedance that will require matching for each band of operation."
"Ununs are intended for use with unbalanced antennas such as verticals and long wires. They will not work with balanced designs such as dipoles or loops and use with a balanced antenna may cause erratic operation and/or damage to the unit."
One side to wire, one side to ground.
Hope this helps.
One side to wire, one side to ground. Which one?
Reviewed in the United States on December 22, 2015
Interesting piece of hardware for using a random-length wire with an SDR-RTL but there's more to this.Reviewed in the United States on December 22, 2015
First, this is not, technically, a BALUN (BALanced-UNbalanced line transformer), but a UNUN (UNbalanced-UNbalanced line transformer)
The picture I've added shows a standard circuit diagram for a 9:1 UNUN. You'll notice a couple things about this. First, how SMALL the NooElec unit is. Second, one side - the UNbalanced side - has twice as much impedence as the side to ground. This makes a difference. Your VSWR is lower when wired right (I tested it with a SARK 110 vector analyzer, a "random" 36 foot piece of 22 gauge jumper wire - see the other two pictures attached, the one marked CSV_001 is wired correctly, CSV_000 is wrong). While the differences are small in my example, other wire lengths at other frequencies can make a HUGE difference. The side with the paperclip goes to ground.
You can test this out yourself if you look at the circuit diagram. One connector shorts directly to ground. The other side has some impedence. I measured - roughly - 5 Ohms with a Fluke 118B digital multimeter).
From Balun designs dot com:
How long a wire to use? While you CAN use a "random wire", 100 years or so of Hams experimenting and calculating have figured this out for you - it's settled science although things like height of the wire above ground and its proximity to telephone wires or home wiring will alter VSWR too so your lengths may need to be a little different. The effects on receive may be marginal on some frequencies depending on your wire length but can make a huge difference on others; transmitting with very high VSWR can be impossible or damage the transmitter, but, since we're not using this particular UNUN for a transmitter, this is FYI only.
Balun Design dot com has a link to a wire length chart you may find useful (fourth picture):
http://www.balundesigns.com/content/Wire%20Lengths%20for%204%20and%209-1%20ununs.pdf
"unun should be used with the wire lengths listed in the table shown in the above link. Use of the 9132 for "random" wire lengths, other than shown, can potentially create an impedance that is too high for an ATU to match. If a wire length not shown in the table is installed, an antenna analyzer should used to determine the actual feedpoint impedance that will require matching for each band of operation."
"Ununs are intended for use with unbalanced antennas such as verticals and long wires. They will not work with balanced designs such as dipoles or loops and use with a balanced antenna may cause erratic operation and/or damage to the unit."
One side to wire, one side to ground.
Hope this helps.
Images in this review
Reviewed in the United States on February 1, 2024
Reviewed in the United States on March 16, 2020
Reviewed in the United States on December 29, 2015
Top reviews from other countries
Michael P. McMahon
THE Best 1:9 Balun For SDR Radio Rx Use!!!
Reviewed in Canada on January 4, 2018Soundworker
Das Teil tut genau das was es soll...HF-Spannung im Verhältnis 9:1 transformieren.
Reviewed in Germany on May 5, 2019
Soundworker
Reviewed in Germany on May 5, 2019
Wenn man anfängt, einem ursprünglichen Balanced-Signal "Ground", also Erde hinzufügen zu wollen, dann verschiebt man die komplette Philosophie einer symmetrischen Speisung in Richtung Rauschen. Wenn man aber einen Langdraht benutzt, macht das Teil schon Sinn, mit dem Anklemmen einer Erde muss man experimentieren. Bei einem separaten Staberder mag es noch angehen, schliesse ich aber eine Erde aus dem häuslichen Bereich (Metallrohre, wie Wasser oder Heizung) an, dann ziehe ich mir UNWEIGERLICH den häuslichen EMV-Störnebel in den Empfänger und der Rauschflur wird unangenehm.
Selber bin ich komplett weg von unsymmetrischen Systemen und benutze nur noch eine 70 cm-Loop für AM von Mittelwelle bis hoch zu 30 MHz, die geht mit einer symmetrischen Leitung (DSL-Rangierdraht) vom Speisepunkt bis direkt an den SDR-Eingang. Damit höre ich in Samao, Fiji und Papua-Neuguinea das Gras wachsen.
Tip für alle Langdraht-Fans:
Einfach zwei Drähte (max. 8 Meter lang) jeweils an die Balun-Klemmen dran, gerade nach Links und rechts gespannt, evtl. auch im Rechten Winkel je nach Platz, am Ausgang des Balun ein Koax dran und nach evtl. Filtern rein in den SDR-Eingang. Der Empfang ist erdfrei und zehnmal rauschärmer als "irgendwie eine Erde" dazu zu klemmen. An eine Loop kommen allerdings Langdrähte nie ran, weil sie die E-Komponente des elektromagnetischen Feldes empfangen, und damit die EMV-Störungen, die auch meist das E-Feld verseuchen. Eine Loop empfängt nur das H-Feld, und dort ist der Rauschflur extrem gering, weil die Störungen des häuslichen Nebels kaum das H-Feld beeinträchtigen.
Images in this review
