Astatic EchoMax 2000 Desk Microphone
This is truly is a new product. Echo mics aren't new, but digital echo
for CB is new. Those of you who detest echo mics please don't skip
this article. I know the majority of echo users are out to annoy the
world, but digital echo can be an enhancement rather than a
detraction. After all, digital delay, echo, reverb and slapback echo
are used in the recording industry as well as in surround sound
The first thing I spotted was the pink label on the outside of the box.
FREE STEREO HEADPHONES
. I thought it was only an
unrelated promotional gimmick. After noticing a phone jack on the
rear panel of the mic next to a small shaft labeled
, I checked
the instruction sheet to confirm that the jack is for monitoring
yourself with headphones. No need for talkback here. Talkback is
almost useless with a desk mic anyway. Most operators want to talk
a foot or two from the mic and to do that the mic must be tuned up
to be more sensitive causing feedback when talkback is used.
Complete documentation is included. It covers maintenance
including cleaning the windscreen, features, controls and their
settings, specifications, dimensions and even a schematic. I've never
seen an echo mic with a schematic before, but Astatic traditionally
supplied schematics for their amplified mics. With the latest trend of
manufacturers supplying less information to their customers it's a
pleasant surprise to see Astatic continue their old tradition.
Here's a list and descriptions of the major features incorporated
in this mic:
This is an effect that is familiar to most people. A word
spoken into the mic will repeat and decrease in volume until it fades
away. The delay time between each echo is set with the Digital Delay
control from a short reverb to a long repeat echo of close to one second. You could easily speak five quick words before
the echo repeats itself.
Slapback echo works exactly as Echo but only repeats once. A short delay adds fullness to your voice,
almost like two people speaking at the same time. A touch of this effect does make your audio sound full on sideband.
ETS stands for End of Transmission Signal, Commonly known as
"Roger Beep." There are two selectable tones. One is a single tone and
the other is a multiple tone (three different quick tones). The tones are
generated digitally and are easy on the ears, or should I say nerves.
This will drive a walkman type stereo headphone set
or an amplified speaker. It has a high quality output and comes from the
same amplifier stage that is feed into the radio. So the sound you hear
is what's going into the radio.
To the left, Figure 1, is a top view that will help you better visualize the
controls as they're described, and following are descriptions of these
controls and the effect they have per the manufacturer's instructions and
The Mic Gain is a slide control that sets the level into the
digital circuitry. This control should be adjusted so that the level
indicated on the VU meter doesn't exceed "+3" on voice peaks. This
meter is quite accurate. Distortion in the echo started at +3 of VU
meter. The setting of this control will vary depending on how far away
from the mic you speak.
The Digital Delay control adjusts I the delay time of the
Echo and Slapback echo effect. Setting the control to the center
position turns off the echo effects. Turning the control
counterclockwise activates the Echo effect and sets the echo delay time.
Turning the control clockwise activates the Slapback echo effect and
sets the Slapback echo delay time. In either case, turning the control
towards MAX increases the delay time.
The Effects gain control adjusts the volume of the Echo
and Slapback echo effects. Setting this control completely
counterclockwise will act the same as turning off the effects. With this
control set completely clockwise, the volume of Slapback and Echo
repeat will be at maximum and sound as loud as the original sound picked up by the mic. At MAX the echo the mic
tested repeated approximately 10 times. Around nine seconds.
This push button controls the ETS (Roger Beep) and on is in the out position.
This push button selects the single or multi tone ETS. Single is in the out position. Master Gain
Control: This control is labeled GAIN and is located on the rear panel of the microphone base near the gooseneck. Use
this control to set the overall level of the mic. This control is set after the mic gain is adjusted as described above.
Headphone Volume Control:
This is also on the rear panel of the mic. Located next to the ear jack it is used to adjust
the headphone or amplified speaker volume. The use of headphones will drain the battery more quickly. Astatic offers a
wall transformer which eliminates that problem.
This mic is of heavy steal construction with four soft rubber feet to keep it from sliding around. The base is black with
gold lettering and trim. The digital control knobs are black with red inserts. The ETS buttons are red. The Mic Gain
graphic display and Digital Delay area are blue with gold trim. The PTT and Lock bars are blue. The gooseneck is a
black flexible type. The nameplate on the front proudly displays "ASTATIC made in U.S.A." in gold. The top panel is a
tough laminated plastic label that will resist scratches much better than silk screen painted surfaces. Old time CB
veteran's may remember CPI (Communications Power Inc.) used these on the face of all their products including the CPI
2000 base radio. Many of these radios are still around and many of the face plate labels still look new on the 15+ year
The 9 volt battery can be changed by removing one screw from the rear panel. The instructions recommend the use of an
alkaline battery, but I would say it's required and not an option. Powering the mic with a 9 volt lithium battery (Radio
Shack # 23-665) should increase battery life 5 times and only cost 3 times the price of its alkaline counterpart. Ant the
shelf life of a lithium battery is about 10 years. If you choose to eliminate the battery its compartment cover has a small
hole for the wire of the optional wall transformer.
A look inside the mic and the quality engineering and workmanship is immediately evident. The circuit board is
computer generated and glass epoxy not the phenolic boards used in most other mics. The meter and microphone
element are terminated with connectors so when the cover is removed they can be unplugged and the cover can be
completely detached from the main body of the mic. The push to talk and lock bar are rugged and designed in such a
way that even pressure is applied to the PTT switch. No switch failures or scratchy transmissions due to side pressure
from poor mechanical designs. The switch should last a long time in this mic.
Looking at the schematic I noticed two amplifier stages dedicated to audio tailoring. This is how they got the sound of
the D104 using a electret condenser mic element. In my opinion, the mic sounds better than a D104. It has more low end
audio giving it a deeper tone while maintaining the high tone response that the D104 is famous for. On the nest page is a
py of the schematic. Even someone that doesn't understand it can see that there is a lot of electronic in this unit.
Sorry for the poor quality, this is a copy of a copy. The original is no longer made available.
Looking at the schematic in the digital delay control area, it looks as if one might be able to increase the delay by
playing with the values of R16 and R17. Playing with the values of R47 and R48 would increase the echo gain, but I'm
sure that changing any values will result in deterioration of sound quality.
On the air results were incredible. Nobody had heard anything like this before. I must admit, I went overboard with the
effects and enjoyed it too. Usually I don't go in for this type of stuff, but with the flawless repeat echo it's too tempting to
show it off. For my taste I found that setting the Digital Delay to the first line inside the Slapback effect range and the
Effects Gain at 7 on sideband gave a fuller effect without a hollow sound. On AM I found increasing these setting
slightly gave a fuller sound to my audio.
Playing with the headphones on, I found that setting the Mic Gain to 5 and the Effects gain to 10 I had a reverse echo.
What I mean by that is that the echo was louder that the spoken word. This is a unique and interesting effect not
mentioned in the instructions. I'm sure there are other effects that can be created with the infinite amount of control this
I did notice two minor things. One is inconsequential actually. Using the headphones with the Mic Gain very low some
digital noise was detected. This was extremely low and probably should be expected. Anyway this computer noise was
not transmitted over the air and probably wouldn't have been notice except I was listening for background noise
specifically. The other is that on some radios the ETS won't work. When .the mic is un-keyed the mic drops transmit
momentarily before the beep. Some radios have a half second delay before they transmit audio from the time the mic is
keyed. This momentary drop of transmit causes some radios to miss the beep tones. This isn't unique to this mic. The
very popular Sadelta Echo Master Plus has the same problem. It only happens on a few models and is easily corrected. A
10 W capacitor on the transmit line in the radio or mic will give enough delay on the transmit line so that momentary
drop out isn't detected by the radio.
The mic cord is terminated with a RJ-45 type connector like those used on telephone equipment and the new ham radio
gear. This makes it possible for the end user to change the mic cord if it goes bad. It also allows you to have multiple mic
cords pre-wired for all you favorite radios in your closet. Want to run a different radio, just unplug the mic cord from the
back of the mic and replace it with one wired for the radio of your choice.
Here's a list of Astatic options and replacement parts:
Wall Transformer And Headphone Set
CTI Audio, Inc.
341 Harbor St.
Conneaut, OH 44030
(440) 593-1111 FAX (440) 593-5395
This is a product that exceeded my expectations on all fronts. Engineering, assembly and performance it's quality all the
way! It's a pleasure to be able to say that, especially about a product made in the USA. Whether you like echo or not, this
mic has studio quality audio without the effects. Suggested retail price is $179.95 but I've seen them as low as $149.95
It's a worth while purchase for the audio quality alone.
BCB Has 2 EchoMax 2000 in stock and are available to CB World Informer subscribers for $129.95 ea.
To Order Call 1 (800) 473-9708.
In This Issue
© CB World Informer 1996 - 2015 Worldwide Rights Reserved
Review Of The Chipswitch
How To Make The Best Solder Connections
Slick Tricks On Microphone Wiring
Proper Base Station & Mobile Grounding
Advertising Claims...Smoke And Mirrors?
Comparison of Cobra 2010 to 2000
Power & Modulation Adjustments
New DF 10,000 Low Pass Filter
Coax Types & Lengths
Linear Amp Selection &Setup
Mobile Radio Interference
New Product Review: Astatic's EchoMax 2000
Channel Kit For PC-122 & Cobra 146-GTL
Did You Know?
Increasing Interest In CB Rumored
What's Happened To Organized CB
Santa's Best CB Gift List
Bob's CB Reopens
New Product: Midland 79-290 AM/SSB Mobile
Swap & Sell
New Product: New Anttron 305 Base Antenna
What's Happening To CB?
CBWI Proposal To Improve 11 Meters
Cobra/Uniden SSB Chassis Mods.
Review Of Midland 79-290 AM/SSB Mobile
Cobra/Uniden SSB Chassis Mod UPDATE
President Jackson Unlocked Clarifier Mod.
Cobra 148 & Uniden GrantXL Clarifier Mod.
Cobra 142GTL & Uniden Washington Clarifier
Uniden Grant Unlocked Clarifier Mod.
Uniden PCI22 PRO SSB Clarifier Mod.
Review Of The Northstar DX880HL
Big Bust At The Consumer Electronics Show
Bob's CB Has Opened
The New Mongoose Model 450 Review
Wilson Antenna Tests The Trucker 5000
A Company With Interference Solutions
Solving Telephone RF Interference
Lowpass Filters: What, Where, And How
Using Highpass Filters For TVI
How To Conduct A Noise Audit
Modern Do-It-Yourself Grounding Techniques
Using Water Pipes For RF Grounding
Using Water Pipes For RF Grounding
The New Emperor TS-3010 Review
Grounding Coaxial Cable Shields
Modern Lightning Protection - RF Entry Ports
Modern Lightning Protection - AC Power Lines
Modern Lightning Protection - Control Lines
Modern Lightning Arrestors - Polyphaser VS I.C.E.
Modern Lightning Arrestors - Alpha Delta VS I.C.E.
Modern Lightning Arrestors - Cushcraft VS I.C.E.
Galaxy DX 2547 Reveiw
Inside The DX 2547
DX 2547 Channel Mod
DX 2547 Clarifier Mod
DX 2547 Photos
DX 2547 Manual Excerpts
The Anttron Story
Anttron 305 Revisited
New Antrron Products
Aries A-SWR 460 Digital Meter
Barjan Buys Wilson Antenna
Wilson Electronic In Cell Phone Market
First Web Issue
Help Get The Word Out
Sneak Preview: The New Maverick A24
Maverick A24 Front Panel Controls
Inside The Magnum Maverick A24
Barjan Buys Francis Antenna
Wilson Antenna, 1 Year After Barjan Buyout
Solarcon I-Max 2000
False Performance Claims
CAUTION: Don't Burn Out That Radio
Magnum's Filtered Power Cord
Dragon Super Heavy Duty SO-239 Stud
CBWI...Give Us Your Opinion
Reveiw Of The RCI 2950DX
RCI 2950DX Image Rejection Modification
RCI 2950DX Coversion & Clarifier Mods
RCI 2950DX Photos
RCI 2950DX Board Component Layout
RCI 2950DX Adjustment Layout
RM-9807: Petition To Remove 155 Mile Limit
Slip-Sear Radio Box
RF Limited UTB-1 Adjustable Talkback Board
A Message From The Editor
Review Of The General Lee
General Lee Conversion
General Lee Tune-Up
Genral Lee Pot. Adjustments
Proposal For Citizens Radio Network
RF Limited EC-2018 Turbo Echo Mic
RF Limited EC-2018XTR Xtreme Echo Mic
RF Limited TRB-1 Turbo Echo Board
Santas CB Gift List
Review: RCI 6900F TB 10 Meter Transceiver
RCI 6900F TB Frequency & Clarifier Mods
RCI6900F TB Tune-Up & PCB Adj. Locations
RCI 6900F TB Photo Gallery
UPDATE: Maverick A24 Transceiver
Texas Ranger SRA-158 Stock Mic
Astatic's Final Edition D-104 Silver Eagle
Firestik's All American Limited Edition Antennas
Uniden PC 68XL Turbo 121 Combo From Mexico
The Cobra 29 Night Watch Classic
Cobra XL 450 Amplifier From Mexico
Review: The Magnum 357DX
Magnum 357DX Photo Shoot
Magnum 357DX Conversions
Magnum 357DX Adjustments
MD-4 External S/RF Meter
Adding MD-4 To The Magnum 357DX
Adding MD-4 To Other Radios
PanaVise Pedesal Mount
A Little History On The CCC People
AR-3500 Operating Manual
AR-3300 & AR-3500 Photos
Maverick A24 Technical Bulletin
Super Star Silver Salute Specifications
Magnum Delta Force 2002 Conversion
Top Gun 56 Mic
Top Gun 56 Story
Top Gun 56 Audio Test
QUAD-5 10 Meter Transceiver
QUAD-5 Magnified Photo
QUAD-5 Operator's Manual
QUAD-5 Photo Gallery
Top Gun SP-1a Speech Processor
DAS Acquires Turner
RCI Move Manufacturing