Amateur Radio - Desk Microphone
Warren Gregoire and Associates LLC
FOR THE RADIO HOBBYIST
1933 Davis Street, Suite 276, San Leandro, CA 94577, USA






MODEL TX-2020
DESK MICROPHONE SYSTEM
"Dream microphone" now appears in real life.

TOP PHOTO: UPPER MAST

MIDDLE PHOTO: BASE




BOTTOM PHOTO: FULL VIEW

Astute radio operators have been telling us what they feel is needed, in a top quality microphone since 1996, and our designers, engineers and technicians have responded with the TX-2020 system.

CONTINUOUSLY VARIABLE FREQUENCY RESPONSE
We refer to it as a "system," because, in addition to just being a fine quality microphone, it also includes an integrated preamplifier with a continuously variable frequency response curve, under the instantaneous control of the operator.

We feel that this approach is superior to dual microphone elements, because instead of having just two switch selectable frequency response curves, the TX-2020 system provides an infinite number of response curves, all available simply by rotating its 270 degree tone control knob through its range.

When the knob is in the center of its travel (marked RC on the dial), the unit exhibits nominally level (flat) frequency response. This setting should provide the most natural voice quality. Rotating the knob clockwise introduces the punchy sounding mid/high frequency boost in the response that is so effective in cutting through on crowded frequencies. So, the operator is able to select at will the exact amount of high frequency boost desired in a particular situation.

Also provided (by rotating the knob counterclockwise from center) is a high cut/bass boost continuously variable response curve that can be useful in tailoring the sound to suit particular voices and equipment combinations that may result in overemphasis of the higher frequencies.

Operators will be able to conduct on the air testing, using feedback from other stations, in order to determine the best equalization settings, for their voice, equipment and operational goals.

ACOUSTIC NOISE CANCELING (NO MORE FAN NOISE ON THE SIGNAL)
Many operators complain that other microphones tend to pick up and transmit the sound of their linear amplifier's cooling fans. This sounds, on the air, rather inelegant, if not downright obnoxious. The TX-2020 system should solve this problem completely with its state-of-the-art noise canceling electret microphone element. The noise canceling feature operates acoustically by leaving the back of the diaphragm open to the environment, as well as the front. Therefore, when ambient sound such as a cooling fan strikes the diaphragm from both the front and back simultaneously, the vibration cancels due to the 180 degree phase difference. How effective is this cancellation? We estimate a cooling fan sound would be reduced as much as 25-30dB, enough to virtually "disappear it."

TELESCOPING MAST FOR ADJUSTABLE HEIGHT
Another problem area with many desk microphones is that their distance above the operating table is not easily adjustable, making it difficult and awkward to use with certain combinations of table height and operator height. The TX-2020 polished brass mast smoothly telescopes up and down, to any height between 8 and 13 inches.

COMPATIBLE WITH NEARLY ANY RADIO
Compatibility with a wide range of different radios is high on the operator's want list. The powerful integrated amplifier may be set by the manufacturer to the correct audio output voltage and impedance level, to match virtually any radio, ever made. As long as connectors are still available, it should work beautifully with the oldest radios still in use, as well as with the latest "whiz-bang" transceivers, and all equipment in between. Adapters are available even for Collins and Drake.

RADIOS NOT COMPATIBLE WITH TX-2020
We know of no radios that are not compatible with the TX-2020 system. (But if you want us to make one for a 1940's or 1950's transmitter, such as Heathkit, Johnson Viking or Collins KWS-1, you will need to send us the mic. connector.)

IS THERE AN ADAPTER FOR YOUR RADIO?
Adapters: Yes, the TX-2020 utilizes an adapter system, so that an operator may change back and forth between a variety of different radios. Adapters using the increasingly popular 6-pin and 8-pin (RJ type) connectors are now available, as well as the more traditional 8-pin and 4-pin round connectors. One adapter of the operator's choice is provided at no additional charge, with TX-2020 purchase. We doubt there are many radios that we can't make an adapter for. Additional adapters typically are priced at $39.95, each.

PUSH-TO-TALK BUTTON INCLUDED
A high reliability miniature red button is included, mounted in the TX-2020 base. VOX operation may also be utilized interchangeably with PTT operation, with those radios so equipped.

DIMENSIONS
Height - continuously variable, 8-13 inches. Base - 1.9 x 2.8 x 1.2 inches. Microphone element - 0.8 x 0.3 inches.

9 VOLT BATTERY REQUIRED
We recommend using an Alkaline battery, Energizer or Duracel brands are suggested

FREE CALLSIGN IMPRINT
The official radio station callsign of the operator is imprinted on the base of each TX-2020 microphone system, at no additional charge.

LOW PRICE
Operators told us they needed affordable pricing for their "dream microphone." The more than reasonable $139.95 (one adapter included) price is a reality now, but like prices of other items, it eventually will go up. Get yours BEFORE this happens.

IF YOU GET IT, BUT DON'T LIKE IT
In the unlikely event that you are not satisfied with your TX-2020 desk microphone system, you may return it within 30 days, in undamaged condition, for a full refund of the purchase price, less original shipping and handling charges.

ONE YEAR LIMITED WARRANTY
We guaranty to repair or replace any TX-2020 microphone that fails due to a manufacturing defect, for a full year. Accidental damage, misuse and abuse are not covered. This warranty does not cover incidental or consequential damages. The owner must telephone us for shipping instructions prior to sending the product for warranty service. 1-800-634-0094 0r 510-633-9353.

SHIPPING AND HANDLING CHARGES
USA charges are $10.95, Canadian orders, $14.95, all other international orders are $23.00.

DELIVERY INTERVAL
The TX-2020 desk microphone system and its associated adapters are custom manufactured to suit the exact requirements. Delivery in the USA typically is within about 14 days. International destinations take slightly longer, and vary by country, and customs procedures.

HOW TO ORDER
Simply telephone us at 1-800-634-0094 or 510-633-9353. Visa, Mastercard, American Express and Discover credit card telephone orders are accepted Orders may also be faxed to 510-633-9355, or mailed to us. An order form is available for printing. Click here for amateur radio order form. Web orders are not accepted, at this time.

QUESTIONS? CALL NOW TOLL-FREE 1-800-634-0094

Specifications, prices and availability subject to change without notice.
Copyright 2006 Warren Gregoire and Associates LLC
All Rights Reserved.