D-104 wiring help

[N7LRG]

I am trying to wire a UG8 style (non amplified) to a kenwood ts-711A. I tried both diagrams on the astatic site but no luck. I can make it key but no audio, Any help appreciated, thanks.

[WA9WVX]

Here's a classic example of not realizing the difference between an older designed (Astatic) product being the D-104 High Impedance (500 K Ohm) Microphone and the newer Solid State Amateur Radios (Kenwood) using a Low Impedance (600 Ohm) Microphone Input requirements. It's a total mismatch therefore requiring an In Circuit In-Line Audio Transformer or an Audio Pre-Amplifier Circuit to be installed into the Desk Microphone's Base.

You may want to contact Astatic's Technical Service Department via E-mail and ask for their recommendations and/or addition parts at the link below:

http://www.astaticinstalled.com/contact.asp

Or

If you're technically creative understanding transistor FET technology, you can breadboard a circuit similar to the one designed on the W4JK web link:

http://members.cox.net/n4jk/d104.htm

Or

Use 1 of the 4 circuit designs (near the bottom of the page) on the following web link:

http://www.barovelli.com/radio/astatic/astatic.htm

73, Dan

[WA9WVX]

Well if you haven't found a solution for your High "Z" Impedence to Low "Z" Impedence problem D-104 Desk Microphone. I've found the exact component that you need and it's very inexpensive. Go to the following web link:

http://www.kenselectronics.com/lists/audxmfr.html

CR45-715 audio xmfr 3/4x5/8x5/8" insulated wire 50K to 500 ohm $8.85

Wire the High "Z" Astatic Microphone element to the High "Z" Primary windings (50K) and the Secondary windings to the Low "Z" (500 Ohm) output / radio microphone input. This should solve the Audio Impedence "Z" Mismatch.

73,

Dan

[W4MCX]

I am trying to wire a UG8 style (non amplified) to a kenwood ts-711A. I tried both diagrams on the astatic site but no luck. I can make it key but no audio, Any help appreciated, thanks.

(I think the mic is just too much for that radio)

[K2HAT]

RE: HW-101 WITH A D-104 ON A T-UG8 STAND
by W9GB on November 19, 2005

You 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.

http://www.heilsound.com/amateur/hcelements.htm

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 input vintage (like you Heath HW-101) transceiver.
The kits includes a custom mounting ring and cover foam to properly mount the HC 5 element within the D-104 microphone head!!

w9gb

http://www.heilsound.com/amateur/hcelements.htm

73's

Lee