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Username: Tech808

Post Number: 17657
Registered: 8-2002

Posted on Friday, May 21, 2010 - 2:34 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

This USER ~ TEST REVIEW is of the:

CERAMIC CB Radio Power Microphone
Ceramic Mic Cartridge
Volume & Tone Controls
Wired for 4 Pin Radios.
From: RF Limited

COPPER PART #P03-00008 CR577 Ceramic Mic


Actual Size:

Height: 3-3/4"
Width: 2-1/2"
Depth: 1-1/2"

Microphone Type:

1" ~ Ceramic Cartridge
Microphone Sensitivtiy: -60dBFrequency Response: 30 - 15000 Hz.
Volume (Amp Gain) Control: 1 ~ 10
Audio Tone Control: 1 ~ 10
Battery Type: Standard: 9 Volt}

Standard Cobra/Uniden type 4 Pin Microphone Wiring:

BLACK Wire ~ Ground / PTT
SHIELD Wire ~ Ground ~ AUDIO
RED Wire ~ Microphone Audio


* 1" Diameter Ceramic Microphone Cartridge
* Low-Noise Audio Amplifier IC
* External Volume (Gain) Control on Back Panel
* External Tone Control on Back Panel
* The Highest Quality, Soft-Shell Neoprene Microphone Cord
* Separate Battery Cover for Quick and Easy access
* Metal Front Grill
* Pre Wired for 4 Pin Radios
* 2' coiled which streache's to 80" microphone cord (Very Flexable & Heavy Duty) unlike some of the smaller diameter mic cord's that come on most mic's.
* Large "easy to see / read" White number's on VOLUME & TONE control's. Make it easy to read when mobile / driving.
* Tight~Snug Volume & Tone control's.


I have seen other Review's on the CR577 microphone from RF Limited on the internet comparing it to the Discontinued Astatic 575 hand mic.

With my past personal use of the Astatic 575M6 I would have to say the RF Limited CR577 WIN's hand's down for: Clarity, Quality of Sound and Overall Performance.

The 3 radio's I used in my on air testing from the Base Station and in Mobile use were:

RCI 2995DX with Copper Part #M60-07422 #C4PRI6 Mic Connector.

Superstar 158EDX,

Uniden PC78XL.

As different Microphone Tester's offer a different quality of sound's due to different built in speaker's, I used the following Microphone Tester's in testing the CR577 Microphone:}

The CR577 was tested with the microphone about 2" from our lip's in Base and Mobile testing.

Microphone Tester's I used in testing this microphone were the:

Superstar T747 Microphone Tester,
Copper Part #E01-06025
Landmatic Microphone Tester
Diesel Microphone Tester.

Final Thought's:

While the Astatic 575 microphone's were and are very good microphone's, if you like tear drop shapped mic's, I would honestly have to say the RF Limited CR577 Full Sized Microphone is a GREAT Microphone that will work well with ANY radio and offer the user QUALITY Sound / Audio output.

A personal Thank You! goes out to Shirley / 808xyl my Better Half in testing this product for many hour's of use from the Base & Mobile.


Radio Enthusiast!