INRAD Desk Microphone System

INRAD, a division of Vibroplex┬«, enters our 37th year of offering quality accessories for the active Amateur Radio enthusiast. 

The INRAD microphones and the DMS-1 PTT locking base have received an enthusiastic review in the January 2018 issue of QST magazine.  Read the complete review here.  The review summary: "An excellent audio signal from a reasonably-priced, high-quality microphone.

New:  INRAD is now the official exclusive desk microphone supplier for FlexRadio.  Our products can also be purchased direct from the FlexRadio website.

The new INRAD Desk Microphone System incorporates 1 of the 5 INRAD M-series microphone models plus our model DMS-1 heavy PTT desk stand and a detachable coiled cable that runs from the back of the base into the microphone jack on your radio.  These are sold as a complete package from $144.95 to $164.95 retail.

Plug the detachable coiled cable into the mic jack on your transceiver, and you're ready to operate.  To use the microphone with a different transceiver brand, plug in a different accessory cable.  Easy!


The base is metal and weighs 2.5 pounds to keep it from sliding around or being knocked over easily on the desk.  Total weight of base and desk microphone, over 4 pounds!  Metal microphone body, standard 5/8 x 27 thread metal standpipe, rubberized microphone clip.  The circular rubber ring around the circumference of the metal standpipe for the mic clip is an internal shock mount for noise isolation.

Large push-to-talk switch on the base front.  To lock the PTT for those longer QSO's, slide the silver slider switch to the left while the PTT switch is down.  To release, slide back to the right. 


On the back of the base, the 1/8" connector connects to the microphone body.  The 4 pin XLR connector is used for the detachable coiled DM-series cable that connects to your transceiver mic jack. 

Own multiple transceiver models with different mic jack configurations?  It's as easy as unplugging the cable from the rear of the base and connecting the next cable.

Want a different on-air sound from a different INRAD microphone?  The M-series microphones on the base are also interchangeable.  To change from one mic to another, unplug the 3 pin XLR cable from the back of the mic and pull it off the clip.  Plug in the new mic, put it on the stand.  It's that simple.

Alternatively, the M-series microphones can be purchased alone and used with either a stand or boom of your own.  M-series microphones are supplied with a 3 pin XLR to 1/8" mono male jack that is used with M-series adapters to plug into the front of the transceiver.  We also have foot and hand switches available that plug into the microphone adapter. 

Already own an INRAD microphone?  The DMS-1 PTT stand can be purchased as a stand-alone item.  To order a microphone without a base, the DMS-1 base alone or other related microphone items click here to view the other portion of the INRAD microphone ordering page.  To order a complete INRAD desk microphone ready to plug into your HF rig, see the tabs at the bottom of this page.  

The current INRAD desk microphone line consists of 5 desk microphones, each with a dynamic element unique to the specific model.

We have created a document that explains the microphone frequency response for the 5 models, called INRAD Microphones And Transmission Of The Human Voice.  The document compares the 5 models to each other and includes response curves.  A summary is included at the end of the document. 

FlexRadio transceiver owners:  Click here to read our guide on cable selections for all models. 

M629:  The INRAD M629 is a revolution in price versus performance for Amateur Radio microphones.  This undirectional cardioid dynamic microphone features a large 1.125" diaphragm and an internal rubber element suspension system for reducing undesirable noise.  Excellent 180 degree rear rejection cardioid response.  Excellent articulation across the specified frequency response with a rise in response to match the voice characteristics of speech.  Output tailored to rise from 500 Hz, crossing 1 kHz up to 4 kHz, exaggerating the microphone output frequency response of these vocal frequencies.  The result is clear, overall well-articulated audio response tailored to match intelligibility of human voice.  Our top of the line microphone, along with the M650. 


M650 is our line-leading counterpart to the M629.  Featuring a unique cardioid dynamic element with a response pattern similar to both the M629 and the M665.  What differentiates the M650 from the M629 is an abrupt response change above 1 kHz to 2 kHz then flat response to 4 kHz.  This microphone has well articulated overall audio response but has overall higher-end output suitable for DXing or contesting, or running the rig with speech processing turned on.  Lower frequencies are somewhat diminished relative in output to the higher ones, giving the sound more high end punch with slightly less low end response.  Classic ball microphone hood and an internal breath screen.  Well-articulated overall audio with plenty of high end punch for DX operation and/or using the speech processor on the radio to drive output.  Top of the line unit like M629. 

M686 is a cousin to the M629, with excellent transmit audio response from a unique cardioid unidirectional dynamic element.  Compared to the M629, the M686 has a similar high end rise in the 2 to 4 kHz range, with slightly elevated higher end output useful for DXing or use with the speech processor on, with slightly less low end response while retaining an overall well-rounded audio profile.  Black metal frame, squared off metal microphone hood. 

M665 features a retro chrome look reminiscent of the classic Shure 565.  The M665 is similar in overall response to the M650, except the abrupt rise from 1 to 2 kHz in audio response on the M665 does not occur until after 2 kHz.  Overall, this microphone has a little bit less higher frequency audio output plus a slightly flatter response from 100 Hz to 2 kHz than the M650.  Similar to M650, but with less high-end punch and slightly better overall frequency response.  Unique cardioid dynamic unidirectional element.  Built-in spherical breath and pop filter on the element.  Sounds great!  

M628:  Flat audio response for accurate reproduction of voice spoken into the microphone with 40 Hz-15 kHz response, metal frame and element ball hood.  Flat overall response across all vocal frequencies without a boost a specific frequencies to cut the lows or highs down.  An excellent all-purpose microphone that can be used with just about any HF transceiver.  Clean, clear SSB transmit audio at a nice price! 

Ordering information:  Each DMS-series desk microphone package includes the microphone corresponding to the number of the package.  Example, the DMS-629 includes the M629, the DMS-686 includes the M686, etc.

Headsets with boom microphones and communications grade headphones plus more accessories to be released in spring 2018 by INRAD.  Watch this space for more information.

About INRAD:  2018 is INRAD's 36th year of offering quality transceiver accessories for Amateur Radio.  We have designed and marketed many transceiver modification kits, aftermarket high end crystal filters featuring better performance than the OEM originals, Collins mechanical filter kits and related modifications and other items over the decades.  Today, we use our expertise to offer our new line of desk microphones and accessories for everyday Amateur Radio operation.

DMS-629 Desk Microphone - ICOM cable - see details

DMS-629 Desk Microphone - KENWOOD, ELECRAFT cable

DMS-629 Desk Microphone - 8 PIN YAESU, FLEXRADIO, TEN-TEC cable

DMS-629 Desk Microphone - RJ-45 YAESU, FLEXRADIO modular cable

DMS-629 Desk Microphone - FLEXRADIO 6400/6600 only TRS+RCA cable

DMS-650 Desk Microphone - ICOM cable - see details

DMS-650 Desk Microphone - KENWOOD, ELECRAFT cable

DMS-650 Desk Microphone - 8 PIN YAESU, FLEXRADIO, TEN-TEC cable

DMS-650 Desk Microphone - RJ45 YAESU, FLEXRADIO modular cable

DMS-650 Desk Microphone - FLEXRADIO 6400/6600 only TRS+RCA cable

DMS-686 Desk Microphone - ICOM cable - see details

DMS-686 Desk Microphone - KENWOOD, ELECRAFT cable

DMS-686 Desk Microphone - 8 PIN YAESU, FLEXRADIO, TEN-TEC cable

DMS-686 Desk Microphone - RJ45 YAESU, FLEXRADIO modular cable

DMS-665 Desk Microphone - ICOM cable - see details

DMS-665 Desk Microphone - KENWOOD, ELECRAFT cable

DMS-665 Desk Microphone - 8 PIN YAESU, FLEXRADIO, TEN-TEC cable

DMS-665 Desk Microphone - RJ45 YAESU, FLEXRADIO modular cable

DMS-628 Desk Microphone - ICOM cable - see details

DMS-628 Desk Microphone - KENWOOD, ELECRAFT cable

DMS-628 Desk Microphone - 8 PIN YAESU, FLEXRADIO, TEN-TEC cable

DMS-628 Desk Microphone - RJ45 YAESU, FLEXRADIO modular cable

INRAD DM-I Icom 8 pin detachable cable for DMS-1 PTT stand - see details

INRAD DM-K Kenwood / Elecraft 8 pin detachable cable for DMS-1 PTT stand

INRAD DM-Y Yaesu / Ten-Tec / FlexRadio 8 pin detachable cable for DMS-1 PTT stand