DX Engineering DXE-RG-5000HD Manual de usuario

Receiver Guard 5000HD

Receiver Front-End Protector

DXE-RG-5000HD

DXE-RG-5000-INS Rev 2

DX Engineering - 1200 Southeast Ave. - Tallmadge, OH 44278 USA

Phone: (800) 777-0703 ∙ Tech Support and International: (330) 572-3200

Fax: (330) 572-3279 ∙ E-mail: [email protected]

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Introduction and General Information

The DX Engineering Receiver Guard 5000HD is an advanced

electronic receiver RF limiter that was developed over years of

extensive research and testing. The rugged DXE-RG-5000HD

offers performance superior to other devices on the market,

covering 0.5 to 150 MHz with under 0.15 dB of insertion loss.

(<0.15 dB at 50 MHz and <0.3 up to 150 MHz). These highly

effective and inexpensive receive RF limiters prevent front-end

damage due to high RF levels that can result in costly radio repairs.

The DX Engineering DXE-RG-5000HD Receiver Guard should

be used on any radio receive only antenna input for low-cost

front-end “insurance” in these common RF situations, among others:

Receive antennas in very close proximity to transmit antennas

Field-day operations with many transmitters in close range

Multi-transmitter contesting sites

Neighboring Amateur and CB operators

Frequent high-power mobile encounters

DX Engineering Receiver Guards provide automatic protection for receive equipment applications:

The DXE-RG-5000HD works for all radios and offers the ultimate performance required by the upper

tier of transceivers tested to have the best narrow-spaced third-order dynamic range or published RMDR

(Reciprocal Mixing Dynamic Range).

It has been confirmed with extensive testing and real world use that these inexpensive Receiver Guards offer the

best available protection for your transceiver or receiver investment. Combined with RF filters, placed on the

antenna side of the Receiver Guard, exceptional signal control and protection is possible. DX Engineering offers

the highest level of protection for your receiver’s front end.

The Receiver Guard was developed specifically to protect the crucial receiver front-ends of expensive high

performance transceivers at contesting super-station, K3LR. At this world class multi-transmitter contest station,

dedicated receive antennas are exposed to high levels of RF radiated from close-by transmit antennas. DXE-RG-

5000HD Receiver Guard’s multi-stage receive input protectors employed at K3LR have never failed, as none of

the expensive radios have ever required front-end repairs. And they keep on racking up great scores at K3LR,

even in the harshest of receiving environments. Why? Because, the DX Engineering Receiver Guard produces far

lower harmonic and noise products across the spectrum than any competing RX front-end saving device, allowing

competitive contest operations to continue unfettered!

At the heart of each Receiver Guard is a highly effective electronic RF limiter covering 500 kHz to 150 MHz with

an insertion loss under 0.15 dB at 50 MHz and under 0.3 dB to 150 MHz. The multi-stage design includes a gas

discharge tube for maximum pulse energy protection. The Receiver Guard is a passive electronic limiter, not a

filter, so competitive contesting stations must still use separate band filters. For example, the Receiver Guard HD

limiter can reject 10 watts of catastrophic receive antenna feedline RF while passing a signal of about 87 dB over

S-9, which is only 25 mw. That level is well under the point of front end damage.

When there are high levels of RF on your receive antennas, DX Engineering’s Receiver Guards generate far less

harmonic noise than other limiters on the market, which allows your station to continue to operate safely and

competitively. At normal HF signal levels Receiver Guard operates continuously with no effect on the

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performance of your station while providing the best possible protection for your radio. The Receiver Guard does

not pass DC. If you are using the Receiver Guard in a system that requires a DC voltage, insert the DC as shown

in Figure 7.

This is a Receive Only Accessory

Do not connect the DXE-RG-5000HD Receiver Guard

to a transmitter output

DO NOT TRANSMIT through the Receiver Guard

The Receiver Guard is is NOT a filter. The Receiver Guard operates by clamping or limiting

very strong RF signals

Features

Keeps stray high levels of RF from damaging your receiver input

Ideal for separate 160 and/or 80 meter receive systems

Uses state of the art components for maximum protection of receivers

Under 6 nsec response time

Multi-Stage protection

Very low insertion loss

Uses BNC type connectors to avoid accidently connecting to a transmit line

Has been developed and tested in a world-recognized multi-multi contest station

Specifications - DX Engineering Receiver Guard

Frequency Range: 0.5 through 150 MHz

Insertion Loss: < 0.15 dB at 50 MHz, < 0.3 dB 50 MHz up to 150 MHz

VSWR: < 1.2:1

Max Output Level: RG-5000HD: +14 dBm at 10 W input. RG-5000: +10 dBm at 10 W input.

Maximum Power Handling: 10 W CCS (Continuous Commercial Service)

System Impedance: 50 to 75 ohms, unbalanced

Connectors, Input and Output: BNC

Operations with the DX Engineering Receiver Guard

Receiver front-end circuitry is susceptible to damage from very strong signals arriving via the antenna from

nearby high power transmitters. Dedicated receivers and certain transceivers with separate receive-only antenna

inputs generally lack protection from unintended overload and damage.

Dedicated band pass, low pass and high pass filters offer high levels of protection in engineered systems.

However, they are generally expensive and are designed to handle specific offending signals. Other front-end

saving units temporarily disconnect the receiver input for a high level of protection, but they require extra keying

connections. Plus, rapidly keyed relays that produce noise and pulses cannot be used on receive antennas in

contesting stations.

The Receiver Guard is an advanced multi-stage receive signal limiting device that is virtually RF transparent at

normal receiving levels, all the way up to -10 dBm, or approximately 63 dB over S-9. In typical operations,

installed on the RX Input of the transceiver or dedicated receiver, you cannot tell that the limiter is installed. At

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slightly higher than normal receive antenna input RF levels, the Receiver Guard has a specially designed

mechanism of limiting that reflects higher than normal levels of RF energy while generating minimal harmonics

and noise. That, plus it has extremely low insertion loss are the most important differences between the Receiver

Guard and other protection devices.

What happens if the receive antenna is extremely close to the transmit antenna, or there is an antenna support or

other system failure that causes a high RF level to enter the receive antenna input? The DX Engineering

Receiver Guard can save the day!

Some Amateur Radio Operators have an antenna installation arrangement where their Beverage wire antenna, or

other receive antenna, is installed in close proximity to the transmit antenna. With the Receiver Guard installed,

when RF signal levels on the receive antenna line rise above the -10 dBm level, the specially designed circuit

limits the output signal, with a resulting rise in the input SWR. The Receiver Guard 5000HD can dissipate a

continuous 3 watts input, while only allowing only a 76 dB over S-9 signal out to the receiver. Ultimately, the

Receiver Guard 5000HD can handle a continuous 10 watt input, allowing no more than +10 dBm (0.010 watts)

output, which is only 83 dB over S-9 (The Receiver Guard 5000HD is +14 dBm [0.025 watts] output, which is

over 87 dBm over S-9) to the receiver front-end, preventing damage, while the reflected energy at the Receiver

Guard input is nearing 100%. To help prevent catastrophic damage to the receive input from an extremely high

RF level, the Receiver Guard contains a modern gas discharge tube, a fast acting clamp component at the antenna

input connector.

This is a Receive Only Accessory - Do not connect the DXE-RG-5000HD Receiver Guard

to a transmitter output

DO NOT TRANSMIT through the Receiver Guard

The Receiver Guard is is NOT a filter. - The Receiver Guard operates by clamping or limiting very

strong RF signals

Some good scenarios:

Separate Receiving Antennas (a Beverage receiving antenna, for example): If a receiving antenna is located too

close to the transmitting antenna, RF power can flow back into the receiving line during transmit. The Receiver

Guard will limit stray RF energy presented to the receiver (or other sensitive devices such as a preamp).

Contest Stations: There are many different configurations of contest stations. If it is possible to be receiving on

one radio while another is transmitting, a Receiver Guard would make good sense to use. If the radios are on

different bands, and if there is substantial filtering on each band, then the Receiver Guard might not be necessary.

The Receiver Guard is a good ‘insurance policy’ to have in case one of the filter/band/antenna settings is

incorrect, and high levels of RF energy is accidentally applied to a receiver.

Skimmer Antennas: Many stations run a CW skimmer, where bands are monitored for CW activity and

automatically decoded by the skimmer software running on a PC. The skimmer antennas are usually located in the

same area as all of the normal station antennas. If a transmitter is keyed, the receiving antenna can pick up

substantial RF power, especially if resonant. The Receiver Guard will protect the skimmer receiver. The Receiver

Guard would be installed between the antenna and the SDR antenna input.

High Power AM Station Nearby: The Receiver Guard is not a filter. If the bothersome RF source is a constant

high power broadcast station, the Receiver Guard will reduce the AM energy, but it will also reduce all desired

signals as well. The limiting is not frequency specific. Therefore, if a strong signal on 1 MHz causes 20 dB of

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limiting, then all signals on all frequencies will drop by the same 20 dB. That’s probably not what the operator

wants.

For high RF environmental problems, like the nearby strong AM station, inline RF filters should be used to

remove AM band energy from amateur antennas.

Additional Items Suggested but not Supplied

DX Engineering RG-8X 50 ΩBNC Coaxial Cable Assemblies

DXE-1155 Coaxial Cable Adapter - BNC Male to F-Type Female

DXE-RLP-75FF -Lightning Protector, Receive 75Ω, DC Pass, F Connectors

See the Optional Items page near the end of this manual for complete details about these

items as well as other suggested options.

Installation

The DXE-RG-5000HD Receiver Guard is intended to be installed indoors, at the radio. The following

pages show various setups using the Receiver Guard. There are many more combinations possible

beyond these basic diagrams.

Figure 1 - Home or Field Day protection

The DXE-RG-5000HD Receiver Guard is installed into the

“receiver loop” between the RX OUT and RX IN

connectors. On the ICOM IC-7600, press and hold the ANT

selector until 1/R is displayed on the screen as the selected

antenna. This will bring the DXE-RG-5000HD into the

receive loop. By doing this, you will prevent front-end

blowout from nearby transmitters received on the transmit

antenna being used by the IC-7600. Consult your transceiver

manual regarding the use of RX OUT and RX IN

connections.

Note there are optional items used all of the diagrams shown in this manual.

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Figure 2 - Basic Receive Antenna Installation

The DX Engineering Receiver Guard is installed between

the receive antenna (in this example, the DXE-BFS-1

Beverage Antenna) and the transceiver’s RX ANT IN

connection (receive antenna input). On the ICOM IC-7600,

press and hold the ANT selector until 1/R is displayed on the

screen as the selected antenna. This will connect the

transceiver’s receive input to the Receiver Guard and the

Beverage antenna. Consult your transceiver manual

regarding the use of RX OUT and RX IN connections.

--------------------------------------------------------------------------------------------------------

Figure 3 - Basic Receive Antenna

Installation with optional DXE-RPA

Preamplifier

Figure 3 is the same set up as Figure

2with the popular addition of the

optional DXE-RPA Preamplifier.

Consult your transceiver manual

regarding the use of RX OUT and RX

IN connections.

--------------------------------------------------------------------------------------------------------

Figure 4 - Typical Beverage Receive

Installation with

optional Preamplifier and Lightning

Protection

Figure 4 expands the options shown in Figure 3

by including the optional DXE-RLP-75FF

Lightning Protector installed. Consult your

transceiver manual regarding the use of RX OUT

and RX IN connections.

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Figure 5 - Typical Beverage Receive Installation

with optional Preamplifier, Lightning Protection

and Receive Feedline Current Choke

Figure 5 expands the options shown in Figure 5 by

including the optional DXE-RFCC-1 Receive

Feedline Current Choke installed. Consult your

transceiver manual regarding the use of RX OUT

and RX IN connections.

--------------------------------------------------------------------------------------------------------

Figure 6 - Installation for a

Transceiver without Separate Receive

Antenna Input

Figure 6 shows a transceiver that does

not have a separate RX-IN. By using the

optional DXE-RTR Receive Antenna

Interface to switch from the transmit

antenna to the receive antenna, the

Receiver Guard is then connected in-line

with a typical Beverage receive antenna

to provide protection from the

transmitted RF. Consult DXE-RTR-1A

Receive Antenna Interface manual

regarding the detailed use and

connections for this application.

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Figure 7 - Using the DX Engineering Receiver Guard in an Active Receive System with an Active

Receive Antenna and a Transceiver that does not have a Separate Receive Input

Figure 7 shows a Transceiver without a RX IN. The DXE RTR provides the required switching needed

between the transmit antenna and the DXE-ARAV Active Receive antenna. Note the DXE-FVI-1

Voltage Injector must be located inline on the active receive antenna side of the Receiver Guard. The

Receiver Guard does not pass DC.

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Figure 8 - System using a separate Receiver

Figure 8 expands further on Figure 7 by using a separate receiver in conjunction with the DXE-RSC-2

2-Port Splitter / Combiner to allow using the receiver. Note the DXE-FVI-1 Voltage Injector must be

located inline on the active receive antenna side of the Receiver Guard. The Receiver Guard does not

pass DC.

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Figure 9 - Classic T/R Relay application used with the DXE-RTR and the DXE-RG-5000HD

Figure 9 shows a classic transmitter and receiver combination using the DXE-RTR along with the

Ameritron AMR-ARB-704 to provide the switching needed. The DXE-RG-5000HD Receiver Guard is

shown in-line with the DXE-RPA Receive Preamplifier.

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