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Kenwood TS-440 Mic Wireing

Discussion in 'General Technical Questions and Answers' started by N0CIC, Oct 5, 2007.

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  1. N0CIC

    N0CIC Ham Member QRZ Page

    I would like to wire an ASTATIC 10-DA Mic to my TS-440S
    The Mic has 2 cond. plus the shield. Do I wire the Shield to Pin # 8 or Pin # 7 on the mic plug. Which pins do I wire the white and red wires from the mic too ? Pin #1 and Pins #7 or 8?
  2. AJ8L

    AJ8L Ham Member QRZ Page

    Pin 7 and 8 are the same ground potential so you can connect one side of the mic element to either. Pin 1 is for the other side of the element. On my TS-430 which is the same I clamp the shield to the backshell of the connector. You are then going to have to come up with a mic switch which will be between pin 2 and ground. AJ8L.
  3. AJ8L

    AJ8L Ham Member QRZ Page

    Sorry, I jumped the gun. I was thinking that mic did not have a switch. The shield goes to pin 7 or 8, they are the same ground. The mic wire goes to 1 and the swicth wire goes to pin 2. AJ8L.
  4. N0CIC

    N0CIC Ham Member QRZ Page

    Which wire in the Astatic Mic. is the Switch lead ?
  5. AJ8L

    AJ8L Ham Member QRZ Page

    It should be very easy to find with an ohmmeter. Connect one meter lead to the shield and the other lead to one wire. If it shows infinite resistance press the switch and the meter should read less than one ohm. If there is no change with pressing the switch then you have the mic element wire. Use a good ohm meter so you don't put a bunch of current into the mic element.
  6. W9GB

    W9GB Ham Member QRZ Page

    The Astatic 10DA is very popular as a harp microphone for musicians.

    K9TOA restores and modifies vintage PA, commercial radio and music microphones for amateur radio usage.

    Information provided to Robert McGraw, K4TAX in 2004 for his Astatic 10DA.
    The Astatic 10DA is dynamic microphone and capable of up to a 90° head tilt with adjustable tension.

    There is NO Push To Talk (PTT) switch with this mircophone itself -- the PTT is provided by the appropriate Astatic stand or base.  As shown in this photo:

    D-104 modifications
    For Astatic mics, usual color alignment:
    White - Mic audio
    Shield - Mic Ground
    Blue - Ground (PTT)
    Red - Transmit (PTT)
    Black - Receive (PTT)
    Yellow is N/C or goes to shield

  7. N0CIC

    N0CIC Ham Member QRZ Page

    So if I am reading this right, the White lead will go to pin# 1, the Shield will go to pin# 7 or 8, and the Red wire will go to pin#2 on the mic. plug that goes into the Kenwood TS-440S.

    Should be a piece of cake, the hard part will be the souldering of the leads to the pins on the new 8 pin plug that I have.
    Thanks for the info
  8. W9GB

    W9GB Ham Member QRZ Page

    Do you just have just the 10DA "head" or do you have the entire microphone with the desk stand and PTT bar [​IMG]
    The Astatic heads for their desk microphones usually have a 3 conductor plug - that plugs into a "G" or other Astatic stand.

    I sounds like you MAY have a "G" stand with the 10DA on top?


    IF you have a PTT switch -- use you trusty old VOM or DVM to confirm wiring.  IF you do not have a PTT -- then you have to use a foot switch or external button -- like Heil sound offers.

  9. K8JD

    K8JD Ham Member QRZ Page

    I have had my TS440s for about 6 years and never bothered looking up the pins on the mic connector.
    It is totally different than my TS520 and all those tiny pins look like they would be a big pain to solder to.
    The guy I bought it from supplied a hand held mic and it seems to work ok but I don't work much fone anyway.
  10. KD5HOZ

    KD5HOZ Ham Member QRZ Page

    The correct mic for the TS-440 ( and most solid -state rigs ) is a LOW impedance (500-500 ohm) mic; the TS-520 uses a HIGH impedance (50k ohm) mic. The 10-DA or crystal D-104  will work fine un-altered for the TS-520, but probably won't have enough "audio" for the TS-440 without a pre-amp. If your 10-DA is mounted on a stand WITH pre-amp you should be good to go.

    Hope this helps,
    KD5HOZ Billy
  11. N0CIC

    N0CIC Ham Member QRZ Page

    I have 2 G-Stands, one has a gray 2-conductor shielded cable with an Astatic 10-DA head, the other one is a G-stand with a black coiled 3-conductor shielded cable with a D-104 head.
    Which one of these cables and which head would be the best to use on a Kenwood TS-440S.
  12. N0CIC

    N0CIC Ham Member QRZ Page

    The G-Stands do not have an amplifier in them, just a push to talk sw.
  13. W9GB

    W9GB Ham Member QRZ Page

    Your Kenwood TS-440S requires a low impedance (Lo-Z) audio input -- usually a dynamic element microphone.

    The Astatic 10-DA is suppose to be a dynamic low impedance (Lo-Z) element that can work with either the amplified or the non-amplified Astatic stands. USE THIS ONE

    Astatic Schematics

    Factory Astatic bases had the schematic glued to the inside of the base cover.

    The Astatic D-104 microphone uses a high impedance (Hi-Z) crystal element -- since you have the Astatic stand "G" base (no preamp in base) -- the output impedence is Hi-Z (same as crystal element).

    Be aware the Rochelle Salts, (Sodium Potassium Tartrate) are used in crystal microphone elements (D-104).
    Rochelle salts do NOT like SHOCK, HEAT, MOISTURE or ABUSE -- the crystalline structure of the salts breaks down under these conditions. Then crystal element is dead. :-|

    IF you have a bad element, Mouser carries Kobitone crystal (25LM022) and ceramic elements -- that are suitable replacements.
    Mouser on-line catalog -- bottom right of page 1312

    You also have the option of placing a new dynamic Heil element in your D-104 - instead of replacing the bad crystal element. Bob Heil (Heil Sound) now offers a HC104 Conversion kit specifically for Astatic D-104 owners. Bottom right of this web page.

    The HC104 conversion kit includes the Heil HC 5 element (low impedance dynamic) that will work straight into the Kenwood, Yaesu and ICOM rigs. ICOM users MUST decouple the ICOM 8 volts! Bob has included a 1 mfd. non polar capacitor in the kit for use with ICOM radios.
    The kit includes the Heil XT -1 high impedance transformers, so that the microphone can be used with high impedance (Hi-Z) input vintage transceivers
    The kits includes a custom mounting ring and cover foam to properly mount the HC 5 element within the D-104 microphone head!!
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