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Username: Tech808

Post Number: 14145
Registered: 8-2002

Posted on Thursday, July 26, 2007 - 4:42 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Desk Microphone

Complete Specifications,
Non - Technical Review.


Lon ~ Tech808 ~ N9CEF

General Discription:

* On Air Red LED
* Up / Dn Button's that operate the same as radio buttons when wired for radio w-Up/Dn features.
* PTT ~ Press to Talk Button
* LOCK Button
* MODE (FM/OFF/SSB Switch)
* Internal Gain Control
(w/ adjustment access thru access hole in base of microphone)
* Battery Cover (Requires: 2 ~ 1.5V batteries

Technical Specifications

* Microphone: Electric Condensor Microphone
* Impedance: 500 OHM ~ 100K OHM
* Output: 10mV ~ 30mV (mA x 300mV RMS)
* Size: 6-1/2" x 4" x 12" (LxWxH)
(Standbay Current: 0 MA)
* (PTT Transmission: 2.0 MA)
(Lock Transmission: 2.0 MA)
* 2 X 1.5V Batteries Required
* 37" (UNWIRED ie: NO Mic Connector included) Microphone Cord
* Factory Microphone Cord Wiring Information:
(Shield = Mic Ground)
(White = Mic)
(Red = PTT Transmit)
(Blue = PTT Receive)
(Green = Up)
(Yellow = Down)
(Black = Up/Down Common)
(Orange = B+ (NONE)

Review Pro's & Con's


This is a nice looking Desk Microphone without a bunch of bells and whistles that performs exceptionally well.

The size of this Desk Top Microphone from Workman is another plus: Size: 6-1/2" x 4" x 12" (LxWxH)Note! the 12" height is with the goose neck extended straight up)} as it will fit nicely on most any desk and not take up a lot of space.

Another plus I really like is the simplicity of only having 4 control button's ie: PTT/LOCK and CH UP & CH DN with small RED LED ON AIR light.

Radio's used in the Review and Testing of the:

Ranger 2995DX/Magnum S-3200B/President Lincoln/Ranger 5054 DX100

After using the DM502B for the last 10+ weeks on 27.115~AM, 27.115~LSB, 28.360~USB, 24.975~USB and 50.130~USB all reports have been Good Clear Modulation that has punched through the pileup's.

The 36" very flexible mic cord allow's you to place it most anywhere on your desk.


The small hard plastic feet which allows it to slide on a hardwood smooth desktop.

I solved this problem by filling the small screw holes in the 4 feet with dab of clear silicone which after hardening allows the mic to not slide.

You could also add 4 small felt pad's to the mic feet.


To avoid having to rewire this mic for each radio that I tested it with listed above for this review I wired the DM502B for regular 4 pin Cobra/Uniden and used the Mic Adapter's listed below for testing.

CLICK on the LINKS Below

M60-07422 Mic Connector #C4PRI6

M60-07426 Mic Connector #C4PHR5C

M60-07430 Mic Connector #C4PDFC

Final Comment's:

This is a quality made Desk Microphone with a reasonable price that will enhance your on air time with great audio.

Respectfully Submitted,


Lon ~ Tech808 ~ N9CEF
CEF#808 ~ CEF HAM#33 ~ CVC#002