OUR OPINIONS ON AIRCRAFT ADF SYSTEMS

Brought to you by
APG - Eastern Avionics International

An ADF still is a highly useful navigation instrument, particularly for IFR flying. Easy operation is its long suit. It is tough to beat a system that simply points to the station you tune in. Furthermore, instrument approaches into many small airports, expecially outside the USA are still NDB-based. Lastly, if you are equipping an aircraft for operation outside of the USA you are generally required to have an ADF.

ADF is the simplest navigation system to fly and is still very useful in the cockpit.

The newest digital ADFs all have coherent detection for high sensitivity, self dimming flip-flop displays, and approach timers -- a truly great feature. All ADFs require two antennas -- a sense antenna and a loop antenna -- but the latest digital models have combined loop-sense antennas. All of our units are priced with loop antenna and indicator.

When you are ready for an ADF, call us at APG-Eastern Avionics. Many fine models are available although only a few are listed here. We can point you in the right direction and get you the ADF that meets your needs and pocketbook.

HOT TIP!! Whenever you buy an ADF, you must be sure you're getting the following extras with it:

1. The specific loop or belly antenna made exclusively for that ADF model.
2. The doubler plate for that loop antenna.
3. The sense antenna or long wire antenna if your specific ADF requires it.
4. The mounting racks, connectors and contact pins.
5. The special loop cable made for your specific ADF model and WITHOUT any cuts or splices.

Note: Loop cables are very specialized and expensive, often costing more than $300. In most cases, once cut, they cannot be respliced because this would alter the tuning of the system, rendering the ADF inoperative. If you have an ADF that is giving you trouble, it may be the antenna. It is always best to give us a call before you simply make the decision to upgrade.

AVIONICS REVIEWS

Bendix/King KR-86 ADF (Recon.) $1,789.00 $1,449.00 On Sale! KR086-XX The King KR-86 is very popular because it has a built-in indicator. It is complete with the KA-42 loop antenna and a long wire antenna.

Bendix/King KR-87 Digital ADF System $5,810.00 $5,139.00 On Sale! KR0087-16 The KR 87 offers superb dependability in a compact, attractive TSO'd unit. It provides accurate bearing-to-station in the 200 kHz to 1799 kHz frequency range, complete with ADF, ANT and BFO tuning modes, plus audio output for station identification and monitoring AM broadcasts. The KR 87's advanced "coherent detection" design rejects unwanted frequency noise and achieves much greater range while remaining less susceptible to engine noise, static and atmospheric interference. Its "flip-flop" frequency display allows you to switch between pre-selected standby and active frequencies with the touch of a button. Both frequencies are stored in a non-volatile memory circuit, meaning you don't have to worry about battery power. Weight: KR 87: 3.2 lbs. (1.45 kg) KA 44B: 2.8 lb. (1.27 kg) KI 227: 0.7 lbs. (0.32 kg) Power Required: 11-33 VDC at 12 W

Bendix/King KR-87 ADF System (Recon.) $2,689.00 KR0087-16 The KR 87 offers superb dependability in a compact, attractive TSO'd unit. It provides accurate bearing-to-station in the 200 kHz to 1799 kHz frequency range, complete with ADF, ANT and BFO tuning modes, plus audio output for station identification and monitoring AM broadcasts. The KR 87's advanced "coherent detection" design rejects unwanted frequency noise and achieves much greater range while remaining less susceptible to engine noise, static and atmospheric interference. Its "flip-flop" frequency display allows you to switch between pre-selected standby and active frequencies with the touch of a button. The KI-227 indicator gives accurate and fast needle response. Both frequencies are stored in a non-volatile memory circuit, meaning you don't have to worry about battery power. Price shown includes digital ADF, KI-227 Indicator, and Antenna. Weight: KR 87: 3.2 lbs. (1.45 kg) KA 44B: 2.8 lb. (1.27 kg) KI 227: 0.7 lbs. (0.32 kg) Power Required: 11-33 VDC at 12 W KR-87 ADF UNIT ONLY PN 066-01072-0004

Collins ADF-650 ADF System (Recon.) $1,495.00 $1,189.00 On Sale! The Collins ADF-650 is another popular ADF primarily because it uses a combination loop-sense antenna. Additionally the triaxial cable between the receiver and the antenna can be cut to any convenient length which facilitates an easier installation. Our systems are complete with receiver (pictured), indicator and antenna.

Collins ADF-650A ADF System (Recon.) $1,589.00 $1,389.00 On Sale! The Collins ADF-650A is another popular ADF primarily because it, like the ADF-650, uses a combination loop-sense antenna. Additionally the triaxial cable between the receiver and the antenna can be cut to any convenient length which facilitates an easier installation. The ADF-650A includes some minor engineering improvements over the original ADF-650. Our systems are complete with receiver (pictured), indicator and antenna.

Narco ADF-841 (Recon.) $2,395.00 $1,989.00 On Sale! The Narco ADF-841 is another top choice in a panel mounted ADF. It's a terrific value too. It uses the same advanced coherent digital detection system as the most expensive ADF models and has all the top features including flip-flop gas plasma display and an approach timer.

Terra TDF-100D $1,789.00 The compact, power-efficient TDF 100D ADF features a brilliant planar gas discharge display and digital signal detection circuitry. The TDF 100D uses a flip-flop display and a ten frequency memory for simple selection of commonly used frequencies. The unit even receives 2182 kHz, the Marine Distress Frequency. It uses single-knob cursor tuning and can be mounted in an instrument hole with the optional 3" ATI mounting. Terra is no longer in production and will not be manufactured again, however reconditioned models may be available. Call us for details.

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