LDG AAF5 Manuel utilisateur
LDG Electronics
AAF5$Analog$Audio$
Filter$
For All Receivers and Transceivers
LDG Electronics, 1445 Parran Road, Saint Leonard, MD 20685
1
Contents
Specifications & Ratings .................................................................................................................................................... 1
Introducing the AAF5 Analog Audio Filter ......................................................................................................................... 2
Welcome Notes ................................................................................................................................................................. 3
Your AAF5 Filter ................................................................................................................................................................ 4
Installing the AAF5 Filter ................................................................................................................................................... 5
Operation .......................................................................................................................................................................... 6
Application Notes .............................................................................................................................................................. 7
Care and Maintenance ...................................................................................................................................................... 7
Specifications & Ratings
1. Analog filter frequency range:
a. Lo Cut adjustment range: 50Hz-500Hz
b. Hi Cut adjustment range: 500Hz-10000Hz
2. Headphone driving power: 150mW@Max
3. Headphone output impedance: 8-200Ω
4. Input impedance range: Low impedance of 8Ω, high impedance of 10kΩ
5. Speaker output power: >5W (8Ω, THD <0.1%)
6. Speaker output impedance: 4-8Ω
7. Operating voltage: 13.8 VDC +/-15%, 1 amp
8. Size: 6.0 x 3.5 x 1.5 inches (150 x 90 x 40 mm)
9. Weight: 1.5 pounds (680 grams)
2
Introducing the AAF5 Analog Audio Filter
Congratulations on selecting the LDG Electronics AAF5 analog audio filter. The AAF5 can be widely applied
to external audio processing of all types of receiving equipment such as radio transceiver, receiver or
broadcast radio to effectively reduce background noise by more than 10 dB, improve the signal-to-noise
ratio by 20 dB, and increase the overall all signal readability on the RS and RST scales.
This filter differs from others you may have used in that it employs only analog circuits, resulting in
significantly better audio quality than digital filters.
3
Welcome Notes
Welcome to the LDG Electronics family of amateur radio equipment! Starting in 1995 and based in St. Leonard, Maryland, LDG
defines state of the art equipment for the Amateur (“Ham”) radio community.
In addition to offering established equipment we’re continuing to grow our product line. Check our web site
(https://www.ldgelectronics.com) often to learn about new developments! We also offer complete product support through our
web site, and we’re here for you for any questions that you might have. All of our products are supported with a two-year
transferrable warranty. When you sell your LDG product provide the new owner with a copy of the original sales receipt and the
two-year warranty transfers to the new owner.
There is no need to complete a warranty card or to register our products. Your product receipt establishes eligibility for warranty
service; save that receipt! Send your receipt copy with the product when you ship your product to us for repair. Products sent to
LDG without a receipt are considered requests for out-of-warranty repair.
LDG does not warranty against product damage or abuse. This means that a product failure, as determined by LDG, to be caused
by the customer or by other natural calamity (e.g. lightning) is not covered under the two-year warranty. Damage can be caused
by failure to heed the product’s published limitations and specifications or by not following good Amateur practice.
OUT OF WARRANTY SERVICE
We will gladly provide service any time a product fails after the warranty. Send the product to us for repair. We will determine
what needs to be done, and, based on your prior instruction, either contact you with an estimate or fix it and contact you with a
request to pay any repair charges. Please contact LDG with any questions before you send us an out-of-warranty product for
repair.
RETURNING YOUR PRODUCT FOR SERVICE
Returning a product to LDG is easy. We do not require a return merchandise authorization, and there is no need to contact LDG
to return your product. Visit the Customer Support Center on our web site and download the LDG Product Repair Form. On the
Repair Form tell us exactly what happened (or didn’t happen) and why you believe the product needs servicing. The technician
will attempt to duplicate the problem(s) you had based on how well you describe it so please be accurate and complete.
Ask your shipper for a tracking number or delivery verification. Please include your email address so our shipper can alert you
when your product is being returned to you. Be assured that our staff makes every effort to complete repairs ahead of our
published wait time. Your patience is appreciated.
Repairs can take four to eight weeks, but are usually faster. The most recent information is found at the LDG Customer Support
Center. Send your carefully packaged unit with the Repair Form to:
LDG Electronics, Inc.
Attn: Repair Department
1445 Parran Rd
St. Leonard, MD 20685
PRODUCT FEEDBACK
We encourage product feedback! Tell us what you think of your LDG product. In a card, letter, or email (preferred) tell us
how you use the product and how well it worked in your application. Send along a photo or even a schematic or drawing to
illustrate your narrative. We like to share your comments with our staff, our dealers, and even other customers at the LDG
website.
4
Your AAF5 Filter
Your AAF5 is a quality, precision instrument that will give you many years of outstanding service; take a few
minutes to get to know it.
Front Panel:
The front panel of the AAF5 features one pushbutton, three control knobs, one jack and one LED indicator:
Power: Turns the unit on or off
LED: Indicates power on
Level: Controls speaker and headphone output levels
Lo Cut: Sets lower filter frequency
Hi Cut: Sets upper filter frequency
Phones: Headphone jack
Back Panel:
The rear panel of the AAF5 has four jacks:
Input: Audio input jack, 3.5 mm (1/8”) stereo tip-ring-sleeve jack
Line Out: Line-level output for recording, RCA jack
5W Speaker: Audio output, 5 watts to speaker, 3.5 mm (1/8”) stereo tip-ring-sleeve jack
Power Input: 13.8 VDC +/- 15% @ 1A, 5.5 x 2.5 mm coaxial power jack, center pin positive
5
Installing the AAF5 Filter
The AAF5 is intended for indoor use only; it is not water-resistant. If you use it outdoors, you must protect
it from rain.
Place the AAF5 in a convenient location near the radio. Always turn your radio off before plugging or
unplugging anything. The radio may be damaged if cables are connected or disconnected while the power
is on.
Connect the Audio Input jack of the AAF5 to the audio output jack of your radio with the supplied cable.
Both low and high impedance input is supported.
Connect your 4 - 8 ohm speaker to the Speaker Out jack on the back of the AAF5.
Connect the AAF5 to a suitable power supply using the supplied cable. This cable has a 2.5x5.5mm coaxial
plug on the end. Plug the coaxial plug into the Power jack on the rear of the AAF5 and connect the other
end to a DC power source of 13.8 +/- 15% VDC, capable of supplying at least 1 amp. A regulated power
supply is recommended but not required.
6
Operation
All operations of the AAF5 are controlled via the front panel. Set the Level control on the filter and volume
control on the radio to zero. Press the Power button to turn the AAF5 on; the LED will light. If using
headphones, plug them into the front panel jack; this will disconnect the speaker. Adjust the Level control
to preference.
Filtering is controlled by the Lo Cut and Hi Cut controls. Start with the Lo Cut control set to 50 Hz
(counterclockwise), and the Hi Cut control set to 10 KHz (clockwise). This sets the filter to the maximum
audio bandwidth.
Adjust the Lo Cut control clockwise to raise the lowest audio frequency passed, reducing low frequency
rumble. Adjust the Hi Cut control counterclockwise to reduce the highest audio frequency passed, reducing
high frequency hiss.
Adjusting the Lo and Hi Cut controls changes the width of the audio bandpass, and also its position on the
audio spectrum. The diagram below illustrates this process:
Suggested initial settings:
Mode
Lo Cut, Hz
Hi Cut, Hz
Dials
CW
500
700
SSB
350
3K
AM Amateur
50
5K
AM Broadcast
50
10K
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Application Notes
You can move the audio bandpass up or down by adjusting both the Lo Cut and Hi Cut controls. This has the
effect of moving the center of the audio bandpass to a higher or lower frequency. You can “tune” in a
desired signal or reject an interfering signal by adjusting both the Hi Cut and Lo Cut controls together.
Care and Maintenance
The AAF5 filter is essentially maintenance-free. The outer case may be cleaned as needed with a soft cloth
slightly dampened with household cleaning solution. As with any modern electronic device the AAF5 can be
damaged by temperature extremes, water, impact, or static discharge.
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