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Thread: HMN1052A and HMN1080A palm mics, for ASTRO Spectra Mobile Radio

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    Default HMN1052A and HMN1080A palm mics, for ASTRO Spectra Mobile Radio

    I've always noticed there's a major difference in audio quality, between the 1052A and 1080A. The 1080A sounds MUCH BETTER on digital. Here's proof there actually is a difference... I will also be posting the changes (A cap and a resistor, I believe) between the two mics, so those who want to upgrade the 1052A to the 1080A, can do so.

    ---

    SRN - 1278

    APC - 412, 494

    DATE: February 1999

    Memo To: SRN Mailing List

    From: Astro Spectra Product Group / Plantation, FL

    Subject:Notice of Enhanced Astro Spectra Standard Microphones


    In March 1999, the standard mobile palm microphone (HMN1052A) and the motorcycle palm microphone (HMN1062B) will be replaced with new enhanced versions for ALL new orders of Astro Spectra mobile radios. This change will not affect any current Astro Spectra orders unless specially requested by a customer change order (refer to options listed below). Analog Spectra orders are and will be completely unaffected.

    This enhanced microphone has increased sensitivity and a modified frequency response which further improves audio quality when used with Astro Spectra radios in digital mode. Since this change will be noticeable to the users, it is suggested that customers with existing fleets might consider ordering the current microphone for consistency, using the options described below. The analog audio performance is unchanged from the current microphones. Should a current user wish to purchase these new microphones, they will be able to do so through the Accessories and Aftermarkets Division (AAD). Listed below are the microphone kits available:

    OLD
    KIT DESCRIPTION
    HMN1052A Standard Palm Mic

    HMN1062B Motorcycle Palm Mic


    NEW

    KIT DESCRIPTION

    HMN1080A Astro Palm Mic

    HMN1079A Astro Motorcycle Palm Mic


    OPTIONS:
    The following internal options have been established for shipping the new Astro mics as standard for all Astro Spectra Mobile orders:

    OPTION
    DESCRIPTION

    W22 AM Astro Palm Mic

    W22 AN Astro Motorcycle Palm Mic

    The following option has been established for Astro Spectra customers requesting the HMN1052A Standard Palm Mic:


    OPTION
    DESCRIPTION

    W109CJ HMN1052A Hand Mic Spectra

    The following option has been established for Astro Spectra customers requesting the HMN1062B Motorcycle Palm Mic:


    OPTION
    DESCRIPTION

    W109CK HMN1062B Motorcycle WP Mic

    Informational Only, No Warranty Is Implied.



  2. #2
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    Default Help identifying capacitor

    Hi all

    I'm getting some mobiles ready for resale. They came with the wrong mics (HMN1052As) for ASTRO Spectra. The ASTRO Spectra uses the HMN1080A -- which is identical, except there are 3 capacitor value differences. The frequency response is optimized in the 1080As for the IMBE codec. Most people don't know this, and use the 1052A on digital without realizing how shrill/****ty their audio sounds. I will not sell 1052As with ASTRO Spectras!

    One of the parts (HMN1080A board) says "N150 36J". (Or is it a W or M? Hard to tell. Smudged stamp.) I don't know what this means; I guess I'm an idiot.

    Can someone please identify it for me so I can go ahead and order the proper value?

    Btw, I do have the service manual for the mics. I do have the MOL p/n. It's NLA and doesn't list a value

    I found this online calculator and I can make a 15pf capacitor @ 70V, and it equates to 36 Joules. But it just doesn't seem right. 70V? That's not a standard voltage rating value.

    Thank you!
    Attached Images Attached Images

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    It looks like it's marked N150. Maybe a 36pF 5% class 1.
    Don't know if this helps http://wiki.xtronics.com/index.php/Capacitor_Codes
    Last edited by NCRadioTech; Jul 07, 2012 at 07:32 AM.

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    The N150 indicates a negative temperature coefficient (capacitance decreases with increasing temperature nominal 150ppm/deg C )
    36 (just two digits, no multiplier) is 36 pF
    J indicates the tolerance +/- 5%
    good ceramic capacitor reference is here: www.niccomp.com/help/presentations/ceramtrain6020.ppt

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    Try Mouser part no. 80-C317C360J5G

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    Thank you very much, guys. I'm going to write a "howto" upgrade guide on the HMN1052A ---> HMN1080A mic conversion. There's a HUGE difference in audio quality, and with all the radios out there using the wrong mics, I think it's time we fix the problem

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    Here's a parts list of what needs to be swapped out (from the HMN1052A) to make a HMN1080A:

    C1305 0811051A15 - CAP.22uF 63V (polyester film - box type)
    C1306 2182133G39 - CAP 36pf 500V (ceramic)
    C1308 2382397D25 - CAP .27uF 20V (polyester film)

    The Moto p/ns are NLA. Cited for reference only.

    Do not discount how much of a difference this mod makes for digital (IMBE) operation. The 1052A sounds like crap, unless these caps are replaced with the values noted above.

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    Has anyone ever done this mod on a DTMF palm mic? I'd like to retain the analog DTMF capability on my radios that have the W4 head (knobs).

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    OK, so...

    I've figured out the mod for DTMF palm mics. I checked out the schematic and applied the same capacitor value multiplier change for the DTMF mic. This mod makes any of the DTMF mics sound like the HMN1080A- gives low end to the mic. Now you can use your DTMF mic on your Astro Spectra and have touch tone capability for analog mode AND sound good in both analog and digital. Same deal- switch out 3 capacitors. I've done this on 3 mics and it works great.

    The below part #s are from Mouser:

    C2 .047uF 63V (polyester film) P/N 80-MMK5473J63J01TR16
    C3 36pF 50V (SMT, multilayer ceramic) P/N 80-C1206C360J5G
    C5 2000pF 50V (SMT, mutlilayer ceramic) P/N 581-12065C202JAT2A

  10. #10
    deejay No Longer Registered

    Question HMN1052A vs HMN1032A

    Hello!
    How similar are the HMN1053(sorry, the title should have said 1053) DTMF mic for ASTRO Spectras (non digital) and the HMN1032 DTMF mic for the regular Spectra? Is there a mod similar to the one for the HMN1052 for the HMN1053 DTMF mic? Could the same mod be done to the HMN1032a to get it sounding better in digital mode?

    Thanks!
    DJ

    Last edited by deejay; Feb 05, 2014 at 05:38 PM.

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    After having looked at the service manual for the DTMF mics, it looks like ALL DTMF mics that have the same case are internally the same components, just different cables. I did my mod on a variety of different P/N DTMF mics that had the spectra cable on them and it worked great.

  12. #12
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    Default DTMF Mic Modification for Enhanced Astro Audio

    Here's all the info w/pics in one post:

    The below part #s are from Mouser:

    C2 .047uF 63V (polyester film) P/N 80-MMK5473J63J01TR16
    C3 36pF 50V (SMT, multilayer ceramic) P/N 80-C1206C360J5G
    C5 2000pF 50V (SMT, mutlilayer ceramic) P/N 581-12065C202JAT2A

    dtmf_mic_C2.jpg

    dtmf_mic_C3_C5.jpg

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    Very nice! (Borat voice)

    I've heard you on-air with that mic (post-mod) and it sounds fantastic!