Receive Four Square System
Contents
1. The DXE EC4 HCD Costa Console uses an internal eral plag abled G 1 23 Wire connections between the DXEEC 4 and DXERES2 The switch positon onthe DXE EC 4 HCH controls the directly of the received signal in the DXERFS SYSP Position I favors the NE position 2 favors the SE position 3 favors the SW nd posi 4 favor the NW en the array is positioned as shown kc le Control lines usually BCD can normally use god quality CATS cab 4 twisted pairs af 24 AWG wit for runs up 10 1000 feet Typical DX Engineering BCD conta lines requirements are 12 VDC at 25 alg Depending onthe numberof conta lines needed usually 3 ar 4 you can doble up the twisted fas of CATSe cable or we control wire that a least 22 AWG allowing runs up to 1500 feet I Fou use a cable with mone conductors it a good idea to tie the unused conductors o ground Forlanger runs of control cable use a line loss caleulato to ensure you supply the proper contol levels needed Approximate BCD Control Line Ler Maina Copper Wire Gage ac Lento To a z TSS ar EU Active antenna circuitry needs god voltage supply 10 opera properly When supplying power to in active antena you want ave 412 VDC lian at each active under ad CATSe cables not recommended when making long runs to power an active antenna since the line loss in CATSe cable may not supply the proper operational voltages required for ce antenna2. DX Receive Four Square System for 160 80 40 Meters Fa 330 5723290 Introduction The DNE RPS SYS AP Receive Four Square 160780 40m Electrons Package or the vanced amateur radin operalar who wants 1o build an active receive antenna system with vertical nenna elements of their own design using the highly sophisticated DX Engineering receive four Square cul system The DXE RFS SYS AP Receive Four Square 16 40m Electronics Package is packaged syste which includes DXE EC Four position BCD Control Console DNE RES Receive Four Square Array Controller DXE AVA 2 Tour Active Matching units with Internal Disconnect Relays Va heat of the DNE ARAVS 1P Receive Antenna Active Verwal antenas DXE RPA 1 Receiver Preamplifiers also included 10 astune adequate signal level When short passive antennas are we Three Custom Delay Lines The ce delay lines included are based om a 70 foot square physical layout for 160 80 and 40 meter performance Just ad your own short vertical whips ar your four monoband passive vertieals o create a four direetion receiving array allows the system designer unprecedented freedom to build a complet custom receiving system This patented US Patent Number 7 423 588 system array configuration embodies unique phase and time shod combining for sable broadband performance The DXE RFS SYS 3P is a sophisticated receiving system that is designed to be used with four idemical vertical symmetri
3. Depending on the required length of your power wire you will want to use a lime loss calculator vag drop with various wire gages to ensure your power supply normally 13 6 well ited DE wil supply a minimum of 43 VDC 60 anne a each active amenna under Iad A DX Engineering 4 Square or 8 Circle will require approximately 250 millinmps only 4 activex re powered at any one ume When calculating line length take inno consideration the ttl number of stive antenas being powered at any one time in your ine length calculations Appeosimste Active Antenna Power Line Lengths 4 active antennas on st any one me Minima Copper z Wire Gage AWG E E Te ELIO E TW fs m ETEEN Element Element ma BY trement Ber A E Internal Jumper Selection To access the DXE RES 2 jumper blocks remove the 6 screws holding the connector plute of he DXE RFS 2 unit to the enclosure Pull on the pitt separate it from the enclosure The jumper dks should be visible and oriented as shown in Figure 5 Important Nate You cannot use the consi cable wiih he provided items for voltage coro functions Use ahe deal configuration show om the previous page Default Jumper Configuration Settings Figure 5 shovis the default anton jumper settings for the DXE RFS 2 For JMPI amp IMP2 the center and top pins of both are shorted For IMP3 amp IMPA the center and bontom pins of both sre
4. To prevent pattern degrada oe reception of re radisted electa noise or other interference separation of 1 2 wavelength at the lowest operating frequency is ideal See Figure 1 The poal is to do the best you Em by balancing all the acters 1 10 vaveleng is the minimum distance to ang easing sou to For Se pie eer s m gerents ee IPR teen snd anet of annes ede a de a S R ne Proximity to Transmitting Antennas The DXE AVA 2 Active Matching Uni with customer supplied vertica elements or the DXE RAVS IP Receive Antena Act Vertical with Relay active elements and your asia tenance only minimal physical separation 10 maintain safe power levels when the DXE TVSU IA Time Variable Sequencer Uni is used With 1500 wans output and a unity gain 0 dB antenna the closest active element can be 1 10 wavelength from he wanting antenna st the lowest ran frequency Doubling the protection distance qusdruples safe power levels See Tablet ENERO EI Son Tia aero TT ELE m Table T Array Safety Distance Minimams a 00 wats Table 1 indicates minimum safe distances for the sequenced active array from ransmingantennas with 3 dB and 6 dB gain ERP using a 1500 wat rannte Your actual system may Vary coring to locaton ands to various objects For example transiting lega init power output 1500 was into an deal transmitting fur square array produces about 6 000 watis ERP 6 dB gain Because of
5. a wand ace sl he ie cs ap pm pat au ay eke ch Bx i en tony nab kn a wa ae Sout sch hve bed sy in o aged by son ce aby oe pen iu damaged an rte mer cing cd Emme cond ch at ned xmas oes poner aren oy frm of pa sa ae as eth tap pl ph ely elo nt ope eet ml ns wb Easing Te grat gue pd an Gal og Ss Sc Bowe lange ademas of PDS Elias Ine No came a ie w ede yet tas aa tam enol Al er an pr ae as Speco bg nn me
6. he increased red power level nearly 1 2 avelengh minimum spacing between th transmitting and receiving antenna amaya is required even when using the DXE TVSU LA Time Variable Sequencer Unit ta remove ower rom the active receive antennas used in the receive four square array Topographical Considerations lt land is best Erecting the receiving array on sloped land or steep hils may degrade performance To avoid pattern degradation antenni elements must have reasonably similar elevations W s recommended he ground height difference between any element in the array be less han 10 ofthe asray diameter For example a 70 faot diameter array Should be within nix fector level Every ff should be taken vo ake the elements petal Elements Should al be identical in construction and grounding and shouldbe mounted above any standing water line but as close to the ground aa possible In general he system will not be feed by wees ar lige as Tongs the foliage d rs not contact the element Ideally in important receiving directions there shoul be a cleat electa path for st least I wavelength The s e should allow a ground syst evenly distributed around the antenna if one s required s Site Selection in Relation to Noise Sources Because the aay s directional ros comer use this example as guide I you have a ie source and if your primary teni area is orcas locate he array northeast af the dominant oie saree Ti en
7. malfunction especially in a sytem that Here are the most common cases of Res wa previously functioning properly ES Ez Ma zur ur are aaa 12 May mar fo usa apna DE o y EHER EIS E E oh um cas on Pa ts FE Pa Ic m Broken andor shred conductors due w animal weather or other damage including chewed punctured stretched and broken contol sad powerlines andr eine for he system and ach amenna Als stews in the green removable connectors can inadvertently be Ushi tothe sun a como or power conductors Regrese center conductors in the eines casing diiengapement from the female center spare pin of the F connector This cn happen in delay lines as well as in amenna or main Teen connections Many times a compression F connectar that seems to have ong eno ener conductor whan was made has regressed to the point that i is at Ing enough 0 Dake proper contact A properly tilled F conectar should have the center conducoe oti 14 inch beyond the hell when viewed from the side Cheek all F connects Shorted or opened conducir caused by water migration into a cat or feline Over 80 of all Receive Four Square malfunction have been caused by the above system problems A thorough inspection and subsequent testing ol each control cable RF cable and Theit respective connections wil
8. pias Place a jumper across LIME Do not jumper any chr positions Se the DNE ARAV3 1P Receive Antenna Active Vertical Wiley User Manual for mone information about additional peak response jumper einge Figure Active Element LIMF Jumper Locations Station Fecdline Active Antenna Feedline and Delay Lines The weakest link in an amenna system sich as the DXE RFS SYS 3P is often the coaxial cable connections Ali coanchons must be high quay and weather ig o prevent contaminan an onion which can caso the feine impedance to change This can affect the signal oe aloud tbe dectly of the aray The DXE RFS 2 may use the shield at a ground return path for the active element power Note The total loop resistance of ke ground pas must be under 30 2 for reliable operation In resistance of the shield increases due o contminatio the active elements may not function properly Any splices splices re pot recommended in tbe fein sould be igh qual and Surly weather tight The DXESRES SP system has been designed 10 use only 75 Ct coaxial cable High quay ode 75 2 CATV F6 type coasial cable is recommended and is availble from BX Engineering DXE F6 1000 Flooded coaxial cables automa el small accidental euts ot Iscerstions in the jacket Flooded coaxial cable also prevents shield contamination and can be det busied DX Engineering offers an inexpensive preparation ol part number DXE CPT 489 that readies he ana cable far connectors in one opera a
9. ran es ro only changes lightly On the ow hand once the receiving system limits on extemal noise antena ett F R is he only thing that affects the signal to noise ratio An average Beverage antenna exhibits about 6 dB gaia You would need mo reversible Beverage tenis fo obtain dect selectivity and you stil wou be ted neos two bande The DXE RFS SYS 3P system occupies far less space is much easier to instal and ana ess conspicuous and operates over a wider frequency range with similar or better performance Not The DXERES SYS 3P Receiving vem mast be separated fom rasta brother antennas and structures pa lay metal by at least 1 2 wavelen gth Less separation may cause significant pattern distortion and the induction of eradined noise no the system This becomes aparent as reduced rt ear direc in one or more directions oe a higher noise level he receive four square wil be less han 12 waveeng from waning antennas the DKE TVSU 1 Time Variable Sequencer Unit will be required The DXE RFS SYS 3P system cun be positioned as close as 1 10 wavelength ost antennas The DXE ARAV2 Active Matching Units are bypassed to ground When power is nimed otf An optional programmable sequencer such as the DXECTVSU yt required for close Spacing wa triast antenna The DXE TYSU A is includes in the DXE RPS SYS AP complete Receive Four Suare Array Package Significa pattern distortion or coupling may result rm close spacing
10. side and then comer to corner ensure the element locations are square Normally the RFS 2 phasing unit is installed near the center af the four ray leet above any standing water or snow line with the connector side facing down Te placement of the RESA unit rca however he feelings each of the active elements mus be equ E yo mount the RES 2 ona wood post it should be grounded 10 a separate ground rod System Operational Overview The DXE RFS SYS 3P system is comprised ofthe DNE EC 4 BCD Control Console and the DDNE RFS 2 Control Uni These une nern and work together The DXE EC 4 BCD Control Console supplies the nominal 12 Vde operational voltage as well as he 12 Vde BCD control voltage The operational vage powers the DXE RFS 2 Consol Unit wich subsequently powers The active receive elements The BCD switching voltages eause the DXE RES 2 w change the receiving direction ol the armay The DXE EC 4 needs 12 Vde IA Fase power input which may be supplied by your power supply or the optional DXE PSW I2DIA AC Adapter 12 Va mA The DNE RFS 2 distributes the operating power o the active elements through the individual element ones The active elements do net work witout power Cutting power othe DDNE RES 2 also cuts power to the active elements which cae the AVAZ w ground the veal clement Installation The DNE RFS 2 Control Unit can be mounted toa galvanized pipe driven into he ground The DXE RES 2 unit has ben pre drille
11. stoned Figure 5 Jumper Locations showing Default Settings IMPI Selects Power Voltage Source Coax or J12 Shown in default position voltage from J12 AMP Selects Direction Voltage Source Coax or 312 Shown detal position voltage from J12 IMPS and JMP Select Directional Voltage Configuration either Differential ar BCD Both Jumpers must be set the samme Showin fal position for BCD Optimizing the Array To determine i antenna system output ve is he ing factor tune the receiver to the lowest band a the quietest operating time This is usually when propagation poor but some Signals are heard Disconnect the atena and ser the ceiver the narrowest selectivity you expect use Receiver noise power is directly proportional o receiver bandwidth going foen 2 5 KHz selectivity o 250 Hz selectivity reduces noise by 10 dB Const the antenna should resultin a noticeable increase in noise fsa te array signal level sufficient and her optimization or amplification may not be needed A he asray is used on 160m ar below the Active Antenna internal Jumper shal be set as shown in the Installation Section of this manual I the array stil lack en on the lower bands then a pram pliler wih high dymam range Should be used o compensate for the low signal level Using 5 preamplifier when sufficient signal is already present may result in amplification of the noise ng withthe signal Ie always best f use the least gain possible Depending on conditi
12. the selected line a ete sk rt or open circuit problem exit in the control ine orin the RS relay unit ot antenna felines Normal voltages on the connect tl line wil came relays o switch inside the RES unt switching Voltages are comet Taek af system directivity or gap in reception may be due to antenna Leine or delay ine 7 Tes the Active Antennas by fending a voltage on the tested control line A and or B conductos 1 select one dect of RES anit operation Simultaneously fesd normal operating voltage othe tested conductor that powers the Active Vera Tar reception la low value fuse Blows en a short circuit may be fasted by disconnecting antenas and teconnecting ibn ome at a Une Mno uses have blows and connected voltages stay near the nominal 12 Ve levels then 2 Test for active operating voltage at the end of each antenna feedin Ifall are good proceed If not repair feines andlor connectors If voltage is presen on the power new the RFS elay ni but nat measured at the end of good eine aspect inside RES 2 relay unit 10 determine if there is an obvious reason that Active Vertical Antenna power is not making it out the amenna ports A bad connection ouside of the RPS elay unit is usually the probier and Tarely has a component failure inside the RES relay unit been discovered the system previously function properly then the internal Jumper would haye been previously set in Te proper oso for your system configuration 1 you are weahleshooue
13. cally spaced elements 1o provide swiching ar a tection receiving Senna system The system uses time delay phasing Father than the conventional narrow band frequency dependen phasing systems The Ue dey phasing is itv to produce vider and deeper er lls and a narrower main lobe The est ha noise and undesirable Sena are grey reduced for suprimen ratia FAR Bener contiol of phase ad ment provides cleaner patern than found on availible tae four square aa This system offers grs liability in receiving applications The DXE RFS SYS 3P uses sealed elas aed for receiving applications with silver comics t prevent oxidation and contamina Most ramming four square switches use large open rane relays Where the Contact are exposed o al which eas lead o contamination Relays with brass contacts can oxidize leading o poor Fondue Advantages ofthe RFS SYS Receive Four Square Antenna System over ather small or medium size seeciing arrays ace Reduced suscepibility 10 high angle signals compared 10 EWE Flag Pennant and KOAY Excellent dinoetivity in small space for better signal oi ruio Sell in four 90 degree spaced directions Dirty over a very wide frequency range when using DX Engineering Active Matching ni equipped vea element Less pial space and maintenance required than a Beverage antenna and active elements cad only a minimal ground system Ecos relay contact reliability Low euren DC powered contol console allows system operatio
14. d to aceommodite up oa 2 inch OD pipe using an appropriate clamp pipe mounting is desired te option DXE CAVS IP V Bolt Saddle clamp for pipe from Sito 1 34 inches OD is recommended or DXE SSVC 2P Stainless Steel V Bal Saddle Clamp for 1 102 OD pipe The controller can also be mounted om a sturdy wooden post but provision fr rounding he DXERES 2 unit must be made Note UMISLM Never Seez or DXE NSBTA Ant Seize should be used on all camp bots and stainless steel dead hardware to prevent lng and to ensure proper pening The DXE RPS 2is designed w be used withthe DX Engineering Active Vertical Antennas ar may be used wih passive elements The active elements should De installed as clase to the ground as possible but above any standing water ine Ground the ANT negative terminal tn an Adequate ground Active Antenna ements M you are planning to use the array on 160m a jumper in all of the AVAZ Active Matching wits Should be changed Placing a jumper on LIN will peak the ara sensitivity response for uie on 1 wi ite effet on SOs Whos doing this the sensitivity for the AM broadest band will be seduced Al four AVAZ Active Matching uns in the array must have identical jumper settings Rar acces tothe jumpers inthe AVAZ Active Matching uns semove the 2 crews on each side of the cave and eave the boom The circuit board and jumper headers will be visible as thoum in Figure 3 By deta there ane o jumpers across any
15. e Current Choke that wil Turther decouple he feedline rom the antenna and she common mode current and associata poise Troma he feine Lightning Protection While at radio installations rarely suffer damage from gang the best protection isto disconnect electrical devices during tors The key to igang survival is u properly ground lines and equipment and o maintaan the step of shield connections A proper installation improve lightning protection and enhances weak signal receiving performance Consult lightning protection and station grounding information in the ARRL handbooks or by safe othe NEC National Electric Code The DX Engineering website also has technical and produet information isted under Lightning Protection and Grounding Use pining surge protectors for the coil edi and convo lies Four Square Layout Toren Q The four asray antenna elements should be range ina 70 Soot square for this malt system The diagonal comer f the square should poiat in the most debe ceiving directions Element is the default forward element Element ls the rear or null element Position ta the EC A Cantor would switch the four square array 10 the Noch East toward Europe preferred direction for use in Noth America Performance ofthe RES 2 can noticeably decease if structures dig even small amounts lof noise or signals are within I wavelegth of the ay Meare side to
16. e a new system o using a replacement unt check that the internal jumpers in the RPS 2 ui are set eect Tor your synem contol and voltage configuration Proper Receive Four Square phasing requires that each Active Vertical Antenna and its respective equal length edle actually provides the same signal level to the RFS unit Usea sea non fang ground wave signal from a law ar medium pover daytime AM w Broadcast station ht is over 10 miles away oma frequency high in the band ar another constant signal source on 160 or 80 meters well uy from the array to test that each Active Venical s ceives the same signal level Do mot use sky wave or ight signals for these sigma level tests 9 Test reception af each Active Vertical Antena by connecting euch antenna feelin one ta time fo an activated port on the RFS 2 This assumes that god port has been identified and Is Tunetioning properly Normal reception must be confiados each antenna I any antenna ds not providing the proper RE signal level move the AVA unit 10a known god Leine ution ue out the possibly thata bud feedline laten the RF If one or mare Active Receive Venicals produce a low ar o signal then the AVA unit at the buse of that antenna may ao be receiving power Retest for DC power at he antenna end of that fein I 51010 18 Vides found then the Active unit may need to be serviced or replaced New DXE ANA 2 units are available separately by calling DX Engineering 10 all Active Veal t
17. enna everything becomes unpredictable Thi is a 004 case for placing receiving antennas as far from noise sources such a power ines as possible Ground System Your erical elements with the Active Matching units work wel with just a single copper ground sox placed as clase as possible 1o he mounting pipe The mounting pipe can be used as the system voted fhe pipe isan adequate ground I is recommended hata S or leger eg copper Waler ie abo coaveational copper cated steel rods may aba work Depending on soil Conductivity you can expect bener performance with mile ground ods spaced a fev fest apart Tncreasing ground od depth beyond 3 f rarely improves RF grounding because skin fc e oi prevents current from owing deep in the sod Avoid ground rods less han 5 8 LD A pood roan system improves the array performance and chance nn survivability Liis important at each ground system be the same for each active antenna in the as You can test ground quali by listening to a steady Local signal Attach 15 ft of wire bid in a aight ie away from the coaxial fein to tbe initial 10 6 P ground sod H You obiervea change in signal or noise level you need to improve the round A second rad spaced a few leet Say from the fint one may correct the problem or 101012 ground radials cacha SU long should provide a sufficient ground system for most soil colons Ifa good ground cant be established he an optional DXE RFCC 1 Receive Feedlin
18. ested provide the same signal level then change switching voliages to sedate the her ports one ta time and each RFS unit port using one of the cd antenas esting for be same level of reception I one ar more ports ix dead or han diminished Feceptson there may be problem in a delay line or in he RES ni Using tested or replaced delay lines and connectors if ane or mone ports is dead or has diminished reception the RES unit may require service or replacement Ais point the problem in your system should have been iden 1 you need additional assistance from DX Engineering feel free to eall ar write Detailed discussions of system function connections and troubleshooting i best handled by telephone Monday though Friday 8 30 am 10 4 30 pr Eastern Tamme at 330 572 3200 Optional Items DRE WPA 12 mc Sa Sel Vip Time Varia Sequence Uait DXE TUSUJA Rhea Rp ca ne ee re EEE ee nme rg By eo ce pe een cna gl Sige tt ils Mie Moss whan TV pee oa ng Technical Support M you have questions out this pot ori you experience ice during the salio contact DX Engineering at 330 572 3200 You cn siso e mail us at DXEnginering DXEnginering com For best service please take a few minutes to review this manual before you call Warranty pn aca by DN pin aa u so et ain wi ra a ep orc un nr pa eet whch pve to be ee Su
19. is required The DXE RFS SYS 3P includes three sets of custom made delay lines Made for aray side spacing 117 feet thew electrical lengths is euical and careful messuremens were made when manufacturing tbese delay lines using high quality 75 0 coaxial cable with a known Velocity Pactor VP which ita very important Tacto To avoid performance degradation due to inconsistent vana cable constuction all ee of the delay Hne coaxial cable assemblies are manufactured Tram the samme pod Delay lines DLY and DLY2 are half the length of DEL Delay line cables can be neatly coiled in a 1 5 ft diameter coil Support the weight of the cables by sping or securing them to the support pole ar mast rather than allowing them to hang fom the Ius important to use 75 0 ein to the operating position from the DXE RFS 2 Do not use amplifiers combines lee oe spliners that are not optimized for 75 stems Control and Power Connections The DXE RFS SYS 3P system with the DXE EC 4 Control Console no other equipment it teed for powering the DXE RPS 2 the active elements or contlling he receive dci 312 is the erin connector plug oa the front panet af the DXE RFS 2 Itis bbeled G A B G The DNE RES 2 uses a two purt green connector and the top part can be removed by puling it straight of Ths vall alow easier wie replacement or servicing as needed When pushing the Connector back in place ensure you press straight inward w
20. l uncover dh cause of most RFS troubles Here are a few othcr atts for RFS malfunction DD One ar mane burned aut Active Venical Antenna units model AVA 2 or AVA due us lightning pulse or high power RF overload One half wavelength on the lowest rgueney is the minimum distance between he Active antennat and any transmit atenas I ha dianee 6 less and high power used then The Time Variable Sequence Unit model DXETVSU IA us be used o interrupt power 10 the AVA 2 uni E Damaged RFS 2 unit due 1 lightning This has been reported only couple of times and is not very ely Active units that were damaged by alas Once we received actives damaged by us ama That relieved themselves on the antenna whips and AVA units as if they vere ireas The above items are the most common failure paints in the system that ned to be check ar necessary the following farther woubesbtig procedure may assist in finding the malen Receive Four Square Control Troubleshooting Procedure 1 Test the DNE EC 4 BCD Coat Console unit which should be connected only to th corto linet of tne Receive Four Square System When the RC is connected to the control cable do all of ihe selecte switch postion LEDs gh normally When ring he Control Console switch from position 1 2 3 and 4 LEDs light normally measure BCD output voltages Normally 12 for the EC A is oat on the green connector terials lose inside the unit Connections I 2 nd 3 reference o
21. n without AC power malas This system uses a 70 foc square layout which provides excellent dirvetivity and high front 1o back atio fot best signal 1 noise taio and reduction imterference from undesired directions actos the 160 80 and 40 meter bands Fora turkey package including the active atenas 1000 of F rc burial flooded cable connector tools and the DXE TVSUA Time Variable Sequencer Unit se he DXE RES SYS AP Complete System Package Additional Parts Required Not Supplied with the DXE RFS SYS 3P Four identical vertical amena elements This may consist of foue vertical antennas each 8 24 fet all with an accompanying radist system or four 102 venical whip elements such athe DXE WP 102 or DXE WP 102E Four Conductor Power and Control Cable for RFS 2 Four conductor cable 3 plus ground 22 gauge minimum Economically priced COM CW4 DXE CAVS 1P or DXES Pree mounting bracket accepts pipe OD sizes from 1 2 inch to 2 inches 75 Coastal Cable with F Connectors When calculating cable length include connections from the phasing unit 10 euch active matching unit element plus the distance othe operating postion You must use 75 0 coaxial able witha known velocity factor VF for all connection We recommend using a high quality 75 0 Noodod F6 type coaxial cable such as DX Engineering part number DXE F6 1000 Finoded styie cables automatically sea small accidental cuts lacerations in he cable jacket Flooded cables also pre
22. nd comes with an exlra cut cai Ta ensure weather tight connections use DXE SNS6 25 Snap N Seal compression le connectant DXE SNS6 25 contains 25 Snap N Seal connectors enough for the entire array plux some sparet The Snap N Seal connectors can be installed with normal crimping tools or pls 40 you must use an installation yo like the DXE SNS CTI available from DX Engineering for proper connector installation Active Antenna Feedlines Use 7 0 coil cable from ech AVAZ Active Matching unit wo the DXE RFS 2 The four folie from the DXE RFS 2 phasing unit othe AVAZ Active Matching units can be any length coded to accommodate the size of the ara but must al be the same length velocity factor and ype Nat the orientation and numbering of the elements by using Figure 2 Be suse the appropriate Vertical antenna element is connected othe proper ANT connectar on the phasing unit The default Ger contol voltage forward diction wars Element 1 Element 3 is the rear or mul dico Delay Lines The DXE RFS 2 uses atime delay system not a traditional phasing systern Delay line lengths are ictal by array dimensions rather than operating frequency This results in phase being corect Tor rearward cll at any frequency Thin system is especially effective when used with DX Engineering AVAZ Active Matching units User supplied passive elements can also provide exceptional performance for single or dual band operation where high dynamic range
23. ons a preamplifier cun cause receiver overload this may rule a ent or bypassing the preamp The DXE RPA 1 HF Preamplifier has beter dynamic range than mos receives and can be used to compensate for the decrease in array signal ouput The DAF RPA I preamplifier is automatically bypassed when powers removed Front to Rear Null Optimizing The DXERES 2 is factory adjusted 1 the correer settings for most coil cables In some ass the ll depth may need to be adjusted to compensa fovinacarte delay line lengths To adjust the mull ph tune 10 a strong steady signal aff he back O the antennas selected direction and adjust RA nd RS for the deepest ul weakest signal olf the back Use Figure 5 to locate R and RS near he ene of the circuit board Operation When using dhe DXE RFS 2 positions 1 though 4 onhe EC BCD Con Box wil phase the Sppropeiate active vertical elements to give you excellent receiving capabilities he front to buck signal o moise ratia af he active era elements in the four phase array allow you oe oniy enhance the desired received signal bur also 10 decrease an uated receive sigaal by selecting a position that will drastically seduce or sliminte le Normal Receive Four Square Operation When the Receive For Square system is flanetioning properly how ar medium power daytime AM Broadcast ground wave signals boul be alemstely artenuaed or improved wih directional switching However song sky wave
24. signals ariving at high angles of propagation will aha very le signal level change av different directos are selected on the Receive Four Square Although some Jow band signals may be received at very low levels they ane heard mare easily dae do far less noise received bythe non ssonan ara Use the DXE RPA I Receiver Preamplifier nach pr ampli exceptionally low noise and Bigh dynamic range characteres The DXE RPA 1 will enhance the intelligibility af the weak DX signals without adiing the nose that plagues many of the pre amps that are al lato modern transceiver The Receive Four Square array pattern is designed to enhance forward low angle signals and reject card and high angle signals The Receive Four Square system provides superior signal o ae esus that allow you 10 hear signals that are impossible t copy on much noisier transmi antennas for greatly improve weak signal DX operations Receive Four Square Troubleshooting There are several possible causes for a malfunction of a DX Enginsering Receive Four Square System Testing the system is not difficult and can be Completed in an hour ar so Separate eilt for directional switching Active Vertical Antenna power and antenna phasing can each be affected by a variety of tabling connection and or component problems I you are oubesboting a new tem or using a replacement RES 2 un chock that the internal Jumper are set corel for Your tem contol and voltage configuration ve Four Suar
25. sures the aay looking away from he source of oe wes beaming In e primary listening direction The second best location for the array is When the noise source le as far ES possible from ether side ofthe ary yon look at patterns the eal locaton fot the array is neta places undesired nase in a deep mal area H your location dosn t have the usual noise sources power lines lc fences et locate the antay so that you wasting antennas and building are aff the back or side of he receiving array Noise that mits he ability to hear weak signal on the lower hands is generally a misture of local ground wave and ionosphere propagated noise sources Some installations suffer from a dominant oie source located close tothe amenas Noise level differences between urban and rural locations Can be mone than 30 AB during the daytime on 160 meters Nighie can bring a dramatic increase ia the overall poise level as naise propagstes via the Jose rm ull distant sources Since the niet extemal tothe antenna deci can reduce ole inst Consider these things about noise sources IC noise is not eventy distributed performance will depend on the gain difference between he desired signal direction azimuth and elevation and average gain tn the direction of Ef nakke pr dominsatly arrives from the ection and angle of desired signals assuming polation of signals and nse are the same tbere will be no protest he sina M vbe noise originates in the es il of the ant
26. the round pin Gas shown blow The etc potion wl supply the BCD gi voltage a show in the chart belom Tea Data T UN HU En ET y pe 7 Element 3 7 CE E Tent T T fit es BCD Directional Canal Matra Equals 12 Vde Dahn The number terminal of the 4 pin green connectar correspond to the numbers in the table above wi voltage measured as referenced 1 the G ground terminal 3 M the voltages are not normal less han 10 to 18 Vde with the control ine connected then disconnect the control line and retest the Contre Console If valiages that were na come tt hov okay at indicates a short in the conta line oe a problem in or beyond the RPS 2 Receive Four Square relay un 4 M the RC has only a couple LEDs lit with the control cable disconnected then it may have sustained igtning pls damage and will need o be paired or replaced A new DXE EC 4 ical from DX Engineering Continue troubleshooting the array contral with a good BC ar by wing a 1A fused power 5 Determine if the control line s intact by resistance or voltage testing esch conductor far shoris With the Tar end of the contol able disconnected am the RPS 2 unit 6 With a ood EC or other power source connected measure A B and C control conductor tage at the RFS relay umit with the control cable connected and agai ar the end of the nol cable that is disconnected fromm the RPS relay un I measured voles are not between 10 18 Ve on
27. vent shield contamination and ean be direct bured Nate The DXE CPT 659 ripping tool prepares F6 le cable for connectors in one tary and len opa and comes w h eta cating cti Fine connections must have pood integrity and be weather resistant We recomm able assemblies with Soap N Seal type F connectors The complete DXE RES SYS 3P system including feelin connections requires sitsen type F connectors DXE SNS6IS contains 25 Snap Seal F connectors enough for the entire atray plus spare connectors The the delay lines included with the DXE RPS SYS 3 are already measured othe proper lengths an have six Snap Neal F connectors installed Snap N Seuconnetos canon be installed with normal c imping tools or pliers The DXE SNS CT is an essential too for proper connector installation Nate DO NOT we pliers or other tools 10 tighten the type F connectors they do not segaire Ml rogue to make a goad connection Damage o the various anis may rel and is not covered under werran Use tool such as the DXE CIT 1 F Connector Tightening Tol Example of Array Performance Dedicated receive atenas haye better signal to noise ratios Directing the antenna away from maise sources or twa the desired signal panh the primary benefit Antenna gain is a secondary advantage As frequency increases the ied array size becomes electrically larger in lerma of aveongth The increased electrical paring produces iger sensitivity average gai even though
Download Pdf Manuals
Related Search