The Monroy ATD-300 Traffic-Watch provides multiple capabilities that enhance the safety of flight. Among them:
The ATD-300 Traffic-Watch is a passive receiver capable of detecting transponder replies from nearby aircraft and displaying their range and altitude on a bright 8-character dot matrix yellow LED display. It also provides distinctive voice warnings in relation to traffic proximity. The ATD-300 has a detection range of 5 nautical miles. The system consists of a receiver/indicator unit, antenna, power cord and headphone cable. The receiver is housed in a small aluminum box (2.75 x 0.75 x 5.0) for easy location in the cockpit.
The ATD-300 provides distinctive voice warnings for traffic at different ranges. When set in the FAR mode and traffic is within 3nm and ±1,000ft of vertical separation "Traffic" will be annunciated. As the traffic gets closer to about 1nm and within ±1000ft of vertical separation the message will change to "Traffic Nearby". When set in the NEAR mode only traffic within 1nm and ±500ft of vertical separation will be annunciated by "Traffic Nearby". When set to MUTE there is no warning messages for any traffic, however traffic range and pressure altitude will still be indicated. When there is no traffic activity the ATD-300 will automatically indicate the host transponder MSL pressure altitude. A screwdriver adjustable volume control is located on the bottom side of the unit. Audio output to a speaker (8 ohms) or headphones (300 ohms) is provided on the rear of the unit.
Unlike traditional active TCAS systems the ATD-300 determine traffic's range by its signal magnitude. Although not as accurate, this method allows for a compact low cost unit with a higher reliability than traditional active TCAS transmitters.
The ATD-300 uses the onboard transmitted transponder altitude encoder data and the traffic's encoder data for relative altitude indication. Because these FAA-TSOd encoders are checked every two years, it assures that the indicated differential altitude is as accurate as that received by ATC. Since the ATD-300 has no internal altitude sensor, there is no need for periodic calibration checks or static port connections, particularly in pressurized aircraft. Thus making the unit easily portable between pressurized and non-pressurized aircraft.
In areas of high traffic activity the display will show multiple traffics in an alternating fashion. This is most common for traffic between 4 and 5nm. Display preference is given to the closest traffic by distance and altitude. As traffic gets closer, background traffic display is reduced or eliminated.
The ATD-300 also features a built-in voltage-warning indicator that lets you know if the aircraft supply voltage is out of range. This function works in the background at all the times and is activated after engine start. If an out of range condition exists, the ATD-300 annunciates it by voice and by text.
ATD-300 Operating Manual Click Here (222 KB) 
[ATD-300 Traffic Warning Envelope]
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Ron T., Charleston, WV, December 2004 Warrick A., Perth, Australia, February 2004
Wayne L., Salt Lake City, Utah, February 2004
John C., Ottawa, Canada, January 2007
Sean C., Dallas, Texas, February 2004
"Operation of the ATD-300 is simple and clever...I'm convinced of the benefits. At least three times Monroy's ATDs have alerted me to serious collision threats I might otherwise have missed. For $795, that's a heck of a bargain.
" -Article by Greg Brown, 2000 Industry/FAA National Flight Instructor of the Year AOPA PILOT July 2004 Issue (If you're an AOPA member, you can click here to read the article in its entirety)
The Aviation Consumer's Choice April 2004 Click HERE to view the Article Summary from Aviation Consumer
"[The Monroy ATD-300] has a lower profile on the panel and a simpler, easier-to-read display."
"After flying both units in direct sunlight, cloudy conditions and at night, we decided we like the Monroy display better. Its easier to read both in daylight and in darkness."
Jose,
Thanks for taking the time to "tell me why I should upgrade to ATD-300". You did well. Bought one and it is now in the plane and seems to work fine.
Just after take off, caught a fellow pilot in the pattern with his mode C turned off. Since I only saw 2nm on the ATD screen and not 100% sure what that meant, I asked if he had his Mode C turned on. Within seconds the display was filled out with a relative altitude reading. He was surprised.
Decided to check on another departing plane from the pattern and asked what his altitude was. He replied and I said that sort of agrees with my new toy. He replied that he saw me on his TCAD. Our altitudes agreed. .... I saved the big bucks. You have to love this thing.
I recently fitted an ATD-300 purchased from you. Glad to report the unit performs beyond expectations,
accurately displays traffic, assists alerted 'see & avoid', checks host transponder reply lo-hi voltage feature provides extra redundancy,
all round well worth the money. Regards,
Thank you for sending the ATD-300. Took me less than 20 minutes to replace the 200 for the 300. Couldn't wait to try it out. Seems to work too well around the busy Class B airspace of Salt Lake City. Did a great job picking up traffic and discerning the altitude differences.
Your ATD-300 works great in Canada! It was especially useful on my recent trip to Newfoundland.
Today was my first real test for the new Monroy 300 and I must say, I am impressed. I took off out of Grayson County Airport and climbed to about 2900'. Weather was clear but about 3-4 miles visibility in haze. After about 5 minutes into the flight the Monroy picks up traffic 5 mile and +100. I descend to 2500' and call up regional approach for flight following. Now the Monroy is reading 2 miles +500. I received a call from regional approach saying radar contact and traffic 1 O'clock 2 miles altitude 3000'. I never found the traffic in the haze but I'm glad that I have an extra set of eyes to help me look for it. Mr Monroy, thanks for making such a great product!
Monroy Aerospace Corp., P.O. Box 8217, Coral Springs, FL 33075 USA
Tel. +1-954-294-9006 Fax +1-954-344-5269
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