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If:I, ASTRON II,;, CORPORATION 9 Autry Irvine, CA 9271 8 (7 14) 4 5 8 -72 77 ASTRON POWER SUPPLIES • HEAVY DUTY. HIGH QUALITY. RUGGED· RELIABlE· INSIDE VIEW - RS·l2A SPECIAL fEATURES • SOlIOSTATE EL£CTFOIICAUY REGULATED • FOlD-BACll: CURRENT LI MITING Protects Power Supply trom e:tCeSSive ClJTenI & continuous shorted outPut • CROWBAR OVER VOLTAGE PROTECTION OIl all MocIeIs IICI,I_S·U. IS·U. IS·R • MAINTAIN REGULAT ION & lOW RIPPLE allow line input -go • HEAVY DlJTY HEAT SINK . CHASSIS MOONT RISE • THREE CONDUCTOR POWERCORD • ONE YEARWARRANTY . MADEIN U.S.A. mfO'.UCE SPECIfIC""'S • INPUT VOLTAGE: 105-125 VAC • OUTPUT VOLTAGE: 13.8 we "! 0.05 volts (Internally Adjustable: 11-15 VDC) • RIPPLE less Ihan Smv peak 10 peak (lull load & low line) • "III Inlll ' l. wil' n o ,"C11'11 nill•• MODEL RS-50A MOOEl AS-SOM RM SERIES RS·A SERIES RS·M SERIES MODEl AM-35M MODEL RS-7A 19" X 5'/, RACK MOUNT POWER SUPPLIES C•• li..... Its" Sill ( 111 U ippll, MO DH 0.1, 1,,_,'1 1"-'11 H x W x l WI. 11" .1 ....'2A , 12 5'.. x 19 x 8'.. 16 ....35A 25 35 5'" x 19 x 12"l 38 "'-SOA 37 SO 5'", x 19 x 12'" SO • SepMale VoII and Amp Meters RM-12M , 12 5'" x 19 x 8V, ....35M 25 35 St;" x 19 x 12\, 38 "'-SOM J7 SO 5'1, x 19 x 12'''' SO C••u..... ICS" Sillllllj U i"i•• MODH D. l,IA_, . ] IA_, I] Wx W x D WI. Ith.) RS-JA 2.5 3 3x 4 1~XS J,;, • RS-4A 3 • 3'% x 6'1, x a 5 RS-SA • 5 3'k x 6'1t x 7'1. 7 RS-7A 5 7 3"" x 6'1, x 9 , RS-7B 5 7 4 x 7';' x 10310 10 RS-10A 7.5 10 4 x 7'k x 1014 11 RS-12A s 12 a'e x a x s 13 RS-12B a 12 " x 7'k x 10lf. 13 RS-20A 16 20 Sx9x 10'k 18 RS-35A 25 35 5x11x 11 27 RS-SOA 37 SO 6x 131",x 11 " Cnliu ... ICS" Sill 1 11] "i"i•• MODel Oil, lA _, I] lA _, I] H x W x l WI· llh ·1 , • Switchable YOII and Amp meier RS-12M " " 4'l,x8x9 13 • SepMale 'tOil and Aillp meters RS-20M 16 20 s x a xree 18 RS-35M 25 35 5x11x11 27 RS-SOM 37 SO e xtav x u 46 VS·M ANO VRM·M SERIES • SepMale VOlt and hop Meters . Output YoItage adjustable lrorn 2-15 'tOIls . c..rent limit adjustable lrorn 1.5 amps 10 Full load Ctlli' .... '''' Slltlll, "i.,il, MODEl D,I, lA_,ll I,,·,al H x W x I WI. llh.1 @13.8WC @10VOC @SVOC @13.SV 'lS-12M , 5 2 12 4',., x 8 x 9 ta 1IS-2OM 16 , • 20 5)(9)(10.,., 20 VS-35M 25 15 7 35 5x11x l1 29 \/S-SOM 37 22 10 SO 6)( 13,," x 11 46 RS·S SERIES • variable rack mounl power supplies VRM-35M 25 15 7 35 S'4 x 19 x 121'1 38 MODEL VS·35M VRM -SOM 37 22 10 SO 5'1. x 19 x 1217 SO • Bui lt in speaker ellti..,n les· Sill lllli S~ ,,, i'l MODEL Oft, lA. ,11 b,l MxW xl WI . [lh.) RS-7S 5 7 4 )( 7", >:: 10% 10 RS-1
onfinuedjromp.25 W inding a transformer ca n be tricky when you' re try ing to get the right wire sold e re d to the correct cir c u it boa rd pad . Refer 10 T4 o n Figure 6. NOIe the dots. These are "phasing " dots. They indicate which wires are on which end of the winding . Numbers I and 2 are the ends of one wire, 3 and 4 are the ends of another, and 5 and 6 are the ends of another . Numbers 1,3, and 5 begin the coil and 2, 4 , and 6 are ar the other end . Notice, however that 2, 3, and 6 are co n nected together and go in one hol e in the board. They are all at ground . Thus, there are only 4 connectio ns 10 the circuit board. You will probably need to use an ohmmeter 10 chec k which wires are co ntinuous after winding the to ro id . A simpler way, however is to use different colors of wi re . You can use 26 or 30 gauge wire inplace of No . 28 wire. You may mix sizes if you have diffe rent colo red wire ofdifferent sizes. This saves a great deal of lime. The wire sizes should not be too d issimilar , though . Whe n you are working with th e wire wound on a toroid , you will notice that it is enameled for insulation. You will have to either scrape the enamel off o f the wi re tips wh ile you' re soldering il to the board, or mel! it off with the soldering iron. Melting it o ff works, but creates a mess. It helps to burn the enamel with a match before scraping . When winding toroids, space the turns evenly . Do not bunch them. - A shield a round th e VFO box c an be tack-soldered to the board easily. Just a few tacks to each side will do nicely . You may have 10 remove it a time or two , so do nOI solder il down pennane ntly until the very end. e'This board is intended to fit nicely into a project box that is available at Radio Shack. It is approximately 6" x 5Jh" . You can mounl a speaker against the side wall of the cabinet top, where the vents are located, and is glue it in place . First. glue a small rectangle ofcloth to the box, and then glue the speaker to the box. M ake sure the material covers only the vents . The speaker must overla p the material 10 adhere to the box. «Some components may have to be fonned, trimmed, or clipped to properly fit the board. This is especially true of trimmer capacitors whi ch come in many , ma ny different sizes and shapes. Do not be afraid to do some "engineering" in thi s regard. A ham' s ability to do thi s is what makes thi s hobby what it is. - With a direct conve rsion receiver, il is extremely important to make all connections very solid , especially ground connections . I recommend a double-sided PC board . Ifyou keep grounding fore most in your mind, you will do fine . If a part is to be grounded, you may solder it nOI only to the pad on the underside of the board but also to the upper side of the board . This is why the copper is nOI drilled out around the upper part of the board for grounded pans . Use plenty o f solder when you attach these parts to each side ofthe board . - Make coax and power ground connections to the upper pan of the board. Simply solder the shield to the board ground plane on the upper pan of the board . The same holds true fo r the power co nnection. Insert the positive lead into the proper hole and and solder it to the correct pad o n the underside o f the board. Then, j ust solder the negative lead to the ground plane . - As with any DC receiver, you will hear the signal you are tu ned to on both sidebands. The superheterodyne rece iver by its very nature o nly " hears " one sideband . Conseque ntly , you will need to lune to the proper sideband when you want to QSO a station so th at you are nOI way o ff frequency. Tune on the " lowe r side" of the zero beat. This will insure that you are in correct position. «Note the coax jumper from the VFO to the mixer transformer T5. RG- 174 is handy for this purpose. T u ne up, Ope-ration, a nd Troub leshooting If you have followed the steps above, you have already gotten this rig in an opera ble state. Simply align the VFO, tweak the driver trimmer CI8, tweak the RF amp trimmer, C23, set the RIT control R9 at hal f scale, and hang on to your hal! I have made every mistake possible in building thi s rig . I wi ll gladly respond 10 written requests fo r help . I have tried to guide you around some of them so that if you have hesitated to stan a proj ect before, you will give it a try thi s time . Finding Parts The pans list , Table I, g ives a Rad io Shack pan number for most pans needed for this project. The more exotic ones, such as variable capacitors , trimmer C4, toro ids , semicond ucto rs, dials, and printed circuit board materials can be found in a number of ma il order catalogs. One supplier in particular is dedicated to carry ing parts for hornebrewers . Do nOl be afraid to scrounge around flea markets , surp lus electronics pans houses, o r your own j unk box for pans. My mono is: " When in doubt , try it! " Most metropolitan cities have surpl us houses that sell new (or at least unused) pans at din cheap prices. You just have 10 root around for a whi le 10 find your treasures . I once found a whole box full of vernier dials that I bought for two dollars apiece. New, they are len dol lars. Persevere , and save on pans! Good luck and happy home·brewing!1IJ BIBLIOGRAPHY Cornelio Nouel, " 40 Meters in a Nuts he ll, " 73 Amateur Radio, March 1987. DeMaw, QRP Notebook , ARRL, 1986. Hayward and De Maw, Solid State oesign for the Radio Amateur, ARRL, 1977. Carr, " Ferreti ng out the Problem," Ham Radio , J une 1988. An excellent instructional on understanding toroids and how to wind them. 10 METER DX IS HOT! 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