DFP-1010 RS-232 DF Bearing Processor User ... - RDF Products

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mail@rfproducts-rdf.com -- Copyright © 2001 by RF Products -- www.rfproducts-rdf.comSignal Strength, disconnect the audio monitor, and leave the test setup intact for thetests that follow.E. BEARING DISPLAY TESTS1__2__3__4__5__6__7__8__9__Verify that the signal generator is still set for a 10.700 MHz -60 dBm CW output andconfirm that nothing is plugged into the AM AUDIO IN jack.Set the Operating Mode to FM Voice and verify that the IF Bandwidth is set to Wide.Set the Video Gain to Low Gain and verify that the Track & Hold is set to Off,Antenna Orientation to Ground, Bearing Offset and Averaging Time both to 0.0,and DF operation not disabled.Configure the bearing display for 0.2° resolution. To do this, first click Configure, thenDisplay Options, then 0.2.Connect the DTI-100A DF Bearing Synthesizer to the signal generator and DFP-1010(refer to the DTI-100A Operator's Manual as required for details regarding this testsetup). Set the DTI-100A AZIMUTH selector to 0° and the signal generator for 30%external AM (note that the DTI-100A GAIN control must be appropriately set incoordination with any relevant signal generator modulation gain controls to establishthe required 30% modulation level).A 0° bearing should now be visible with a full-length analog bearing display bearingvector, and a numeric bearing display indication of 0° (+/- 1.0°).Verify that the center dot in the analog bearing display is yellow (as opposed to red).Rotate the DTI-100A AZIMUTH selector in succession to the remaining 11 azimuthsand confirm that the correct bearings are indicated on both the analog and numericbearing displays. All azimuths should be correct to within 1.0°.Set the DTI-100A AZIMUTH selector back to 0°. With the Operating Mode still set toFM Voice, rotate the DTI-100A AZIMUTH selector to 315°. The analog bearing displayvector should correspondingly move from 0° to 315° in approximately 2 seconds.10__ Change the Operating Mode to CW Beacon and wait a moment for the display tosettle. Rotate the DTI-100A AZIMUTH selector from 315° back to 0°. The analogbearing display vector should correspondingly move from 315° to 0° in just under onesecond.11__ Change the Operating Mode to A.I.D. Beacon and wait a moment for the display tosettle. Rotate the DTI-100A AZIMUTH selector from 0° to 315°. The analog bearingdisplay vector should correspondingly move from 0° to 315° in approximately half asecond.12__ Set the Operating Mode back to FM Voice and the Video Gain to High Gain.Page 6 - RF Products - San Diego, California, USA
mail@rfproducts-rdf.com -- Copyright © 2001 by RF Products -- www.rfproducts-rdf.com13__ Rotate the DTI-100A AZIMUTH selector back to 0°, set the signal generator externalAM modulation percentage to 0% and then slowly increase it while observing the yellowcenter dot in the analog bearing display. Verify that the dot changes from yellow to redwhen the modulation percentage reaches 15% or so and note this percentage.14__ Slowly decrease the signal generator external AM modulation percentage whileobserving the red dot. Verify that the dot changes from red back to yellow when themodulation percentage reaches a level approximately three percentage points lessthan that observed in the previous step.15__ Note that the analog bearing display has three concentric rings (two closely spacedouter rings containing the azimuth calibration marks and a much smaller gray inner ringcloser to the center dot). The two outer rings change from green to yellow when thebearing vector reaches (or begins to exceed) full-scale. Verify that these two outerrings are yellow.16__ Set the Operating Mode to CW Beacon.17__ Reset the signal generator external AM modulation percentage to 30% and then rotatethe DTI-100A GAIN control slowly counter-clockwise (to reduce modulation) until thebearing vector length is approximately half-scale. Verify that the two yellow outer ringschange to green as a result.18__ Carefully rotate the DTI-100A GAIN control clockwise until the two outer rings justchange from green to yellow. If this step seems “tricky” and difficult to implementprecisely, try first reducing the signal generator external AM modulation percentage.19__ Change the Video Gain from High Gain to Low Gain. The bearing vector shoulddiminish in length to 25% of what it was when the Video Gain was set to High Gain,and should now be very close in length to the radius of the gray inner ring.20__ Set the Track & Hold to T&H On, the Operating Mode to FM Voice, and restore thesignal generator external AM modulation percentage to 30% (appropriately resettingthe DTI-100A GAIN control as required).21__ Disconnect the coaxial cable from the signal generator to interrupt the signal input tothe DFP-1010. The 0° analog display vector should remain “frozen” for approximately2.5 seconds before it disappears. Note 1: Since the signal must be interruptedsuddenly for the Track & Hold to function properly, the coaxial cable should bedisconnected rapidly. If the signal generator has a carrier on/off switch, this may alsobe used, but it is important that the activation of such a switch result in completedisabling of the signal generator RF output (with some signal generators, theseswitches only partially disable the RF output). Note 2: Some DFP-1010's may becustomized for hold times other than 2.5 seconds.22__ Change the DTI-100A AZIMUTH selector from 0° to 90°, restore the signal generatoroutput to the DFP-1010, and repeat the previous step.23__ Repeat the previous step for a DTI-100A AZIMUTH selection of 45°. Observe thebearing carefully to verify that it does not drift during the 2.5 second “hold” period.Page 7 - RF Products - San Diego, California, USA
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