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Five Mistakes to Avoid When Using Wireless

While wireless systems have freed performers from the bonds of cords and cables, they've unleashed a number of headaches for the sound crew. Getting a wireless system to behave predictably is a challenge faced by touring prof...


Remote Antennas for UHF-R, BLX4R, SLX, ULX, QLX-D or ULX-D Receivers

Remote Antennas for UHF Wireless Microphones Click here for an online remote antenna tool. Antennas are described in terms of the signal wavelength they are designed to pick up. The antenna supplied with Shure...


RF signal loss in cable runs - impedance or cable length?

RF signal loss due to the length of the cable run is far more significant than loss due to an impedance mismatch. Using a 100 foot run of 75 ohm antenna cable with low loss is better than using a 100 foot run of 50 ohm antenna ca...


ULXD Antenna Cascade

The recommendation is two units.  This applies to the ULXD dual receiver (ULXD4D) and the ULXD quad receiver (ULXD4Q).  The antennas connect into receiver unit #1 and cascade into receiver unit #2. The cascaded uni...


How to calculate RF signal loss in coaxial antenna cable

Indeed it is important. Shure has a remote antenna tool to help determine which cables and amplifiers to use at: Wireless Mic Remote Antenna Tool Here is an online calculator for cable loss: http://www.timesmicrowave.co...


QLX-D Antenna Distribution

It is the same as with ULX-D single receivers.  Use the UA844+SWB RF distribution amplifier, UA221 RF splitter/combiner, etc. See our online Wireless Accessory Wizard. Note: Unlike the ULXD4, the QLXD4 does NOT provide ...


Collection of Wireless Troubleshooting Links

Wireless troubleshooting is difficult when on site. Via telephone, it is even more difficult. Via email or chat, it is nearly impossible. The root issue is that there are multiple variables which affect wireless microphone instal...


Antenna Types

The size of an antenna is directly related to the wavelength of the frequency to be received. The most common types used in wireless audio systems are 1/4-wave and 1/2-wave omni-directional antennas, and unidirectional antennas. ...


Antenna Distribution - 2 rooms, 4 antennas

For multiple room coverage, use passive combiners. Since they do not require power and are typically compact, they can be located wherever necessary. A passive combiner will typically result in at least 3 dB of loss, so be sure t...


Outdoor antenna for UHF wireless systems

Yes, there are outdoor weather resistant antenna that may be used for UHF wireless microphone systems: Winegard and others makes outdoor antennas suitable for the 470-698 MHz range. One example that Shure has tested with goo...


Antenna Distribution - 4 rooms, 8 antennas

For multiple room coverage, use passive combiners. Since they do not require power and are typically compact, they can be located wherever necessary. A passive combiner will typically result in at least 3 dB of loss, so be sure t...


Antenna distribution for 2 SLX wireless receivers

Rack the two SLX receivers side by side and passively combine the antennas, using the UA221. When racking two receivers side-by-side, there is enough room to bring the antennas to the front in that same rack space. Use the antenn...


RF distribution and antennas for ULX-D

See our online Wireless Accessory Wizard. See this book for best installation and design practices: Antenna Set-up for Wireless Systems


Antenna distribution for 2 ULX wireless receivers

There are a few options: 1) Leave each ULX receiver in its own rack space. By placing each receiver in its own rack space, the long rack ear has two holes in it for the antennas. Use (2) UA600 kits to bring the antennas from...


Calculate effective operating area of UA874, UA870 or PA805

This procedure will provide a rough estimate. For this example, assume the directional antenna is 40 feet away from the performance stage, pointed at the stage. The operating area of the antenna can be considered an equilateral t...


UA864US antenna mounting scheme and plenum rating

The UA864US in NOT plenum rated.  It shall not be installed in a plenum air supply or plenum air return. The UA864US includes a removable mounting plate. The mounting plate can be attached with screws to an electrical&n...


PA421A or PA821A as a receiving antenna combiner

Yes, this concept will work.  Note that the PA421A and PA821A were designed to combine transmitter outputs which provide far stronger RF signals than receiving antennas.  Thus when the PA421A or PA821A is used as a ...


High school football stadium wireless mic

Installing a wireless mic for a high school football stadium has some challenges, but following recommended guidelines, most installations are successful. First is the choice of wireless system. The receiver that is selected...


Antenna Placement

Most wireless receivers have their primary antenna inputs on the back of the receiver. Since diversity receivers are discussed here almost exclusively, there will be both an A antenna input and a B antenna input on the rear panel...


BLX4R Antenna Distribution and DC Power Distribution

Yes. See our online Wireless Accessory Wizard.


Antenna distribution for 8 BLX, SLX, ULX, QLX-D or ULX-D wireless receivers

Please see our online Wireless Accessory Wizard.


Antenna Distribution - 3 rooms, 4 antennas

For multiple room coverage, use passive combiners. Since they do not require power and are typically compact, they can be located wherever necessary. A passive combiner will typically result in at least 3 dB of loss, so be sure t...


Does QLX-D have DC voltage for antenna amps?

No. The QLXD4 does not have bias voltage on the BNC connectors. If the need arises to connect an antenna amplifier directly to the QLXD4, this can be done using the UABIAST power injector as shown on the Wireless Accessory Wizard...


Radiating Coax Cable

RADIATING COAXIAL CABLE A wireless microphone application may require that the receiver be installed in one area, while the transmitter is used in another. In such an application, remote mounting the antennas insures that the...


Where can I get BNC connector for RG8/U cable?

Amphenol makes a BNC connectors that will fit RG8/U. Amphenol part number is 6775 and it is available from Digi-Key (800-344-4539) as part number ARF1155-ND. Also, Pasternack (949-261-1920) sells 50 ohm BNC connectors that wi...


Will the Shure UA874 or UA870 antenna work if DC power is not supplied?

An unpowered UA874 (or UA870) antenna is essentially an inoperative device. The UA874 Log Periodic Directional Antenna (LPDA) is designed to receive wireless microphone RF signals. It is a directional wideband antenna and a...


Antenna Distribution - 3 rooms, 6 antennas

For multiple room coverage, use passive combiners. Since they do not require power and are typically compact, they can be located wherever necessary. A passive combiner will typically result in at least 3 dB of loss, so be sure t...


PA411 units - combining the RF outputs

While it technically can be done by using the Shure UA221 antenna combiner/splitter, Shure does not recommend it.   Note the following: 1) The UA221 will introduce 3 dB of insertion loss - meaning the RF output pow...


Power for multiple remote antenna amplifiers

The best way to inject DC power for multiple remote antenna amplifiers is with a product called a “Bias-Tee”. The Bias-T is inserted in-line on the coaxial cable. It allows the radio signal to pass through the device, while simul...


Antenna distribution for 14-16 BLX, SLX, ULX, QLX-D, or ULX-D wireless receivers

Please see our online Wireless Accessory Wizard.


Antenna distribution for 8-10 BLX, SLX, ULX, QLX-D or ULX-D wireless receivers

Please see our online Wireless Accessory Wizard.


UA860SWB mounting method

1) Use a A13HDB flange. 2) Fasten the WA371 wireless transmitter clip to the flange 3) The UA860SWB fits into the WA371.  


Why does the P10T have two antenna outputs and not a summed output?

The P10T is actually two individual transmitters contained within a single housing. So all the RF components are discreet and independent of one another. Providing a single mixed output, without adding any loss, would require the...


A75M Universal Mic Mount as an Antenna Mount

Yes, the A75M is useful for this application. The A75M is supplied with a male 5/8"-27 external thread stud - the same thread that is on the top of mic stands commonly used in the United States. The A75M can be clamped to a var...


PA421A comparison to PA411

PA421A Bandwidth: 470 - 952 MHz PA411 Bandwith: 470 - 865 MHz PA421A Nominal Input Power: 20dBm / 100 mW PA411 Nominal Input Power: 15dBm / 30 mW PA421A Absolute Maximum Power Input: 24dBm / 250 mW PA41...


UA864US Antenna - Does it require 12Vdc bias to operate?

The UA864 antenna will work without 12V dc bias in the 0, -10, and -20 switch positions; note that the LED gain setting indicators will not illuminate. 12Vdc bias is required for the +10 dB setting. Recommended practice...


Terminatation of unused ports on antenna distribution amp

No, you do not need to terminate the unused connectors. The circuit design is such that it does not matter if the terminals are terminated.


Frequency response of UA820 antennas

The following graphs show the VSWR of the various UA820 antennas along with their bandwidth. UA820A. Usable 735 to 1000 MHz. UA820B. Usable 645 to 780 MHz. UA820C. Usable 600 to 745 MHz. UA820D. Us...


Quarter-wave antenna dimensions

Product Model Band Low End Frequency - MHz High End Frequency - MHz Center Frequency - MHz Quarte...


Comparison of the UA844US to the UA845US.

Comparison of the UA844US to the UA845US UA844US has an external power supply that automatically adjusts for 100 to 240 Vac. UA845US has internal power supply that automatically adjusts for 100 to 240 Vac, a power switch, an...


How can I weatherproof coax connectors?

This procedure is used by installers of business two-way radio systems.1. Apply a small portion of silicone grease (not the spray lubricant) to the threads of the connectors. Do not get the grease on the center pin.2. Join the co...


Receiver antenna orientation - does it matter?

Theory and practice may have different results. Typically, signal strength fluctuation due only to polarization angle difference (how the antennas are angled relative to each other) is no more than 10 to 15dB.  Signal s...


BNC to BNC dc block

Try the following:Pomona Model 5297 www.pomonaelectronics.com Mini-Circuits BLK-222+ www.minicircuits.comBNC male - BNC female - blocks DC on the inner conductor; 1000pF cap in series


Stiff antenna for SLX1 or PGX1

Here is a simple way to stiffen the SLX1 or PGX1 antenna. Supplies required are:Heat shrink tubing Piece A: 75 mm (3") long, I.D. 4 mm (3/32") Piece B: 25 mm (1") long, I.D. 5 mm (1/8") Piece C: 25 mm (1") long, I.D. 7 mm (...


Distributed Antenna Systems for Large Facility

Is a distributed antenna system feasible for a very large conference center?  Yes, it is probably possible to design and engineer such a system.   It will be critically important to engage a knowledg...


Antenna distribution for 11-13 BLX, SLX, ULX, QLX-D or ULX-D wireless receivers

Please see our online Wireless Accessory Wizard.


Antenna Protection in a Gym

Antennas may be installed inside of PVC piping purchased from a home improvement store.  A mounting method will have to be improvised/fabricated based on the installation site. American Time, Dassel Minnesota USA, ...


Mounting SLX antennas to the side of a rack

Assuming the rack is metal, this is quite simple. Use the coax cables that come with SLX to bring the antennas to the side or top of the rack. Drill a hole through the rack and stick the BNC fitting (attached to the cable) t...


UA820 ½ wave antenna that sags at the hinge point

Obtain a wire twist tie that is used to close a plastic garbage bag. Fold the twist tie in half. With the antenna bent at a 90 degree angle, insert the twist tie into the gap at the hinge. The remainder of the twist tie...


Adjustable RF Attenuator

Consider the model RFA-4056-03. Sold by RF Industries of San Diego, California, USA. http://www.rfindustries.com This attenuator is adjustable in 1 dB steps up to a maximum of 30 dB. The connectors are BNC.


UA505 Metal Bracket Dimensions

The steel mounting bracket (part #53B8493) has a uniform thickness of 0.62" (16 mm). The width of the entire bracket is 1.66" (42 mm). The length of the entire bracket is 4.66" (118 mm). The length o...


1/4 wave antenna with the UA834 RF amplifier?

The performance of a 1/4 wave antenna mounted directly to a UA834 amplifier could be acceptable. However, a 1/2 wave antenna is strongly recommended.


Helical antennas - matching or opposite polarization?

Matched - having the same polarization. Here is an analogy:  take two identical bolts.    Thread a nut on to bolt #1.   Now place the open ends of bolts together; the nut can be threaded of...


Three Way RF Splitter and Combiner

Mini-Circuits sells a three way splitter/combiner with a band pass of 500 MHz to 1,000 MHz. The model number is ZA3PD-1. This combiner uses SMA connectors and not BNC connectors that are used for most pro audio wireless. Ther...


Directional antenna with SLX receiver

See our online Wireless Accessory Wizard.


Custom RF coax cables

http://fieldcomponents.com/coaxial_cable_assemblies.html


Surge Protector for Exterior Antenna

The EDCO CX-HFN looks appropriate for the job. Note the EDCO product used N connectors and the SLX wireless uses BNC. Thus adapters or adapter cables will be required. For such adapters, check: www.pasternack.com


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