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Author Topic: 4 wire to 2 wire Astatic D-104 mic conversion for HW-101  (Read 12952 times)
KD0ZGW
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Posts: 1056




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« on: February 18, 2015, 07:03:39 AM »

Bought a mic (astatic D-104) on ebay but need to rewire it from 4 pin to 2 pin.  I haven't been able to find a schematic and the necessary change is not intuitively obvious to me.

looking for advice ....

thx
KD0ZGW
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N3QE
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« Reply #1 on: February 18, 2015, 08:10:34 AM »

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KB2WIG
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« Reply #2 on: February 18, 2015, 09:37:12 AM »


M,

Did you open the base up? My D10-4 has the schematic plastered on the inside base cover.

gud luck,

klc
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W8RXL
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« Reply #3 on: February 18, 2015, 11:22:40 AM »

Here is a good link for the info you are looking for.

http://www.cbtricks.com/mic_manuals/astatic/

Opps... I should have looked at my note book for my HK stuff.

for my tug stand hooked up to my hw 104 I have written

pin 1 - white
pin 2 - red
Shield and blue - connector body.
« Last Edit: February 18, 2015, 11:26:29 AM by KC8YHN » Logged
WA1RNE
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« Reply #4 on: February 21, 2015, 07:38:22 AM »

I've used a D104 for over 35 years.  Since you didn't mention it, I'm going to assume you bought one without a preamp built in which generally has the following basic wiring configuration and color coding:

 Cable shield:  Serves as audio return line and common ground for the PTT switch

 White: Audio hi from microphone

 Black:  normally open PTT switch


So using N3QE's HW-101 info and assuming you have the proper 2 pin connector for the HW-101:

 1)  Solder the D104 cable shield to the connector spring which when assembled connects to the connector body and to chassis ground of the HW-101

 2) Connect the white wire to pin 1 of the connector (Audio hi)

 3) Connect the black wire to pin 2 of the connector (PTT switch)


.....WA1RNE
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WQ2H
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Posts: 28




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« Reply #5 on: November 26, 2015, 01:22:36 AM »

Chris - Thanks for the help on this. Your instructions worked perfectly for me.

Man, this D-104 is definitely old school - but I love it !

Jim
KB1HUO


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KE0ZU
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« Reply #6 on: November 26, 2015, 04:45:41 AM »

There were a few different versions of the D104, and there are schematics of some of them here.
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Regards, Mike
https://mikeharrison.smugmug.com/
Pics and bold print are usually links.
WQ2H
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« Reply #7 on: December 08, 2015, 04:16:26 AM »


Thanks again for the help  - just want to make sure I had this correct before I put it in my notebook.




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WA7PRC
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« Reply #8 on: December 09, 2015, 04:06:19 PM »


Thanks again for the help  - just want to make sure I had this correct before I put it in my notebook.





One side of the microphone element MUST connect to ground (shield):

(click for larger image)
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W9GB
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« Reply #9 on: December 10, 2015, 09:35:33 AM »

1.) The microphone element (audio source) should have the SHIELDED conductor.
---
2.) In Jim, KB1HUO's example, the White Wire is correct: Microphone Hot (+), BUT the SHIELD should have been wired (internally) to Microphone Ground (-).
In Professional microphones, you will find Balanced Microphone elements -- where 3 wires are required -- 2 for mic audio and the Third for Microphone shielding/ground.

IF you look at the Schematic diagrams for Shure, EV, and Astatic microphones -- you will see this Standard Practice. Musicians and Audiophiles desire CLEAN AUDIO -- Radio Amateurs should as well.
AUDIO follows AC Theory -- just like RF.
---
3.) The Push-to-Talk (PTT) is the Switch in a DC Circuit (follows DC Theory) .... and when ever possible should be shielded from the Audio (microphone) circuit. The Shield on the Audio lines provides this protection/isolation.
In Jim's Astatic, for example, the RED and BLACK wires should have been wired for the PTT circuit.
---
4.) In older radios (designed before 1970s), such as the Heath-kit HW-101 transceiver,
you often see "3-conductor" wiring -- where the PTT and Audio Grounds are connected together.
« Last Edit: December 10, 2015, 09:37:48 AM by W9GB » Logged
NN4U
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« Reply #10 on: February 09, 2019, 12:47:53 PM »

I have the D-104 / T-UG8 WITH amplifier, trying to sort out the diagrams to convert a 4-pin Astatic to a amphenol /Heathkit 2-Pin. Apparently I need to combine 2 wires but not sure which - Red & Black?  Thanks, Chip
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W9GB
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« Reply #11 on: February 09, 2019, 12:58:26 PM »

Chip,
Your Question was answered in Earlier Postings (2015).
IF you are Non-Technical (Color by Numbers),
THEN Seek Local Qualified Amateurs for Assistance (VECs who conducted and signed your FCC Exam).
==
Astatic D-104 T-UG8 Instructions
http://w5rkl.com/wp-content/uploads/2015/02/TUG8-D104-Microphone.pdf

ASSUMING FACTORY Wiring and NO Earlier Modifications

RED and BLACK are your PTT Lines.
WHITE (+) and SHIELD (- , Ground) are AUDIO lines.

For Legacy Common Ground (3-wire microphone wiring),
you connect Audio Ground (Shield around White Wire) to PTT Ground (Use Your DVM, VOM).
« Last Edit: February 09, 2019, 01:12:06 PM by W9GB » Logged
W5RKL
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Posts: 1113




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« Reply #12 on: March 02, 2019, 05:46:23 AM »

Bought a mic (astatic D-104) on ebay but need to rewire it from 4 pin to 2 pin.  I haven't been able to find a schematic and the necessary change is not intuitively obvious to me.

looking for advice ....

thx
KD0ZGW


I used a non-amplified D-104 with my HW-101, SB-100, and both SB-400 and SB-401 transceivers/transmitters.

I changed the 2 pin screw on microphone socket to a 1/4" stereo socket. I wired the microphone "PTT" wire
to the 1/4" stereo plug's "tip", the microphones element "hot" wire to the "Ring" and all grounds to the plug's "Sleeve".

All D-104 microphone schematic diagrams are found on the bottom cover plate (remove 3 screws). Simply following
the wires to connect the microphone element, PTT, and ground to the microphone plug you are using.

73
Mike W5RKL
www.w5rkl.com
RMC(SW) USN RET


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