Hams in Space!

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with the design of printed hairpin bandpass filters. Filters were designed with manufacturing tolerances taken into consideration to provide broad, flat passbands and steep slopes. Manufacturing irregu larities which were once fatal now have little effect. These filters also have no tuning requi red , or even possible. The entire no-tune transverter is available in two forms as kits from Down East Micro wave. One version is a dedicated S-band rece ive converter (the SHF-240 IK). The second is a transverter, which has the same receiver and also a 10 mW transmit section (SHF-2304). Ifyou are going to build something like this anyway, get the transverter and help get more amate ur activity on l3cm. Even barefoot, IOmW is adequate for local co ntacts. You can always add transmit power later. Remember, as amateur rad io operators, we either usc those frequencies or we may lose them. The commercial gu ys arc always hungry for spectrum. and ours loo ks tasty. Both units use a 2 meter IF (Intermediate Frequency) . {Ed. Note: See the February 91 issue of73 for a review ofthese kits.I Construction Hints As the photos show, construction of these devices is straightforward . Build the local oscillator first. You must follow the recommended layout and use good construction techniques. Keep the leads short and solder the joints well . Be sure to ground the one pad that is noted as requ iring through-the-board grounding . Also, pay attention to the orientation of the transistors and MMICs. The Avamck MSA-04 series has the dot on the output, whi le the MCl MAR series has the dot on the input. The tota l tune-up requirements are to tweak a 10 pF trimmer for maxi mum lO output. Photo A shows a co mplete and functionin g local oscillator. A common complaint deal s with the d ifficulty of installing chip capacitors. To do this right, you need a small (1 5 watt ) soldering iron with a small tip, tweezers, a too thpick. and a mag nifying glass. The last item is a suggestion that I learned through experience . Since I passed a ce rtain magic age, I find I can't see far away with my glasses off. and I can'I see close up with them on. So I bought a set of Sears headband-mounted binocular magnifiers . These are only 2 1 h power, but they ' re perfect for ge tting parts in the right place. To mount the chip ca ps (now that you can see them) , first lightly tin one circuit board pad. Don't tin both or the chip may not sit flat on the board. Then place the chip cap where you want it with the tweezers. Hold it in place with the toothpick and remove the tweezers . Touch the iron to the pre-tinned circuit board trace . Flow the solde r onto the end ofthe cap. Then solder the other end of the cap. Resolder the first end if needed to insu re a good connection. Construction ofthe converter board itselfis probably even eas ier than building the l O (l ocal Oscillator). The hard part, at least on the early boards, is that you must usc thin brass foil to co nnect the MMIC gro und leads and several pads to the ground plane side of 24 73AmareurRadio Today. March , 1991 the circuit board . I found that the best way to ground the M MICs is to cut pieces of brass foil abou t IA " long and as wide as the MMI C ground pads, the n make a 90 degree bend back about 3/32" from one end. Slip the long end through the board hole from the circuit side (usc the mag nifiers to make absolutely sure that there arc no shorts to the input or output pads). then hold it in place by putting an awl into the hole. This will form the brass to the hole ar the top, allowing you 10 insert the M MIC down into the hole in the board, where it belongs. While holding the foil in the hole with the 2304/2401 MHz Loop Vagi Element Spacing Circumference Circumference (Original 2304 MHz) (Original 2304 MHz) (Scaled to 2350 MHz) (i nches) (em) (inches) (inches) R2 1.000 2.54 5.480 5.373 Rl 2.744 6.97 5.480 5.373 DE 3.278 8.33 5.125 5.025 01 3.908 9.93 4.676 4.584 02 4.375 11 .11 4.676 4.584 03 5.376 13.66 4.676 4.584 04 6.378 16.20 4.676 4 .584 05 7.081 17.99 4.676 4.584 DB 8.380 21.29 4.676 4.584 07 10.383 26.37 4.676 4.584 08 12.385 31.46 4.676 4.584 09 14.388 36.55 4.676 4.584 010 16.390 41 .63 4.676 4.584 0 11 18.393 46.72 4.676 4.584 012 20.395 51.80 4.534 4.445 013 22.398 56.89 4.534 4.445 014 24.400 61.98 4.534 4.445 015 26.403 67.06 4.534 4.445 01B 28.405 72.15 4.534 4.445 017 30.408 77.24 4.534 4.445 018 32.410 82.32 4.392 4.306 019 34.413 87.41 4.392 4.306 020 36.415 92.49 4.392 4.306 021 38.4 18 97.58 4.392 4.306 022 40.420 102.67 4.392 4.306 023 42.423 107.75 4.392 4.306 024 44.425 11 2.84 4.335 4.250 025 46.428 117.93 4.335 4.250 02B 48.430 123.01 4.335 4.250 027 50.433 128.1 0 4.335 4.250 028 52.435 133.18 4.335 4.250 029 54.438 138.27 4.335 4.250 030 56.440 143.36 4.335 4.250 031 58.443 148.45 4.335 4.250 032 60.445 153.53 4.335 4.250 033 62.448 158.62 4.335 4.250 034 64.450 163.70 4.335 4.250 035 66.453 168.79 4.335 4.250 03B 68.455 173.88 4.279 4.195 037 70.458 178.96 4.279 4.195 038 72.460 184.05 4.279 4.195 039 74.463 189.14 4.279 4. 195 040 76.465 194.22 4.279 4.195 041 78.468 199.31 4.279 4.195 042 80.470 204.39 4.279 4.195 043 82.473 209.48 4.229 4. 146 044 84.475 214.57 4.229 4.146 045 86.478 219.65 4.229 4.146 04B 88.480 224.74 4.229 4.146 047 90.483 229 .83 4.229 4.146 048 92.485 234.91 4.229 4.146 049 94.488 240.00 4.229 4.146 Boom: 8' length of lh w diameter aluminum tubing (do not use anodized tubing). Elements: All e lements are made from aluminum strips 0.25 w wide byO.032" thick. Circumference: Distance between centers of 0.116 holes drilled in each element. Tolerance ± 0.D05". Each element is to be made approximately ~" longer than the specified circumference dime nsion to allow approximately 3/16" overlap between the ends of the element. Table I . Scaledfrom W/JR 13cm 52-element design.
9 Aut r y Ir vine. CA 927 18 (7 14) 4 58 -7277 ASTRON POWER SUPPLIES • HEAVY DUTY· HIGH OUALITY • RUGGED· RELIABLE· SL SE RS-L SERIES MODEL VS-50M SPECIAL FEATURES • SOliD STATE ELECTROO ICALlY REGULATEO • FQL,D.-BACK CURRf:NT LIMITINGProtects Power Supply from excessivecurrerl1 & continuous shorted outPut • CROWBAROVERVOLTAGE PROTECTIONon all Models IIClpt R8-3A. RS·4A. RS-5A. RS-4L 1lS·5L • MAINTAIN REGULATION & LOWRIPPLE at low line input Voltage • HEAVY DUTYHEATSINK. CHASSIS MOUNT RISE • TliREE CONDUCTOR POWER CORD except tor RS·3A • ONE YEAR WARRANTY · MADEINU.S.A. PERFORMANCE SPECIFICATIONS • INPUT VOlTAGE: 105-1 25 VAC • OUTPUT VOLTAGE: 13.8 VOC ± 0.05 vcns (Internally Adjustatlle: 11-15 VOC) • RI PPlE Less than 5mv peak to peak (full load & low linel • All units available in 220 VAG input voltage (except lor Sl -11A) Colon tanllnuaus ICS' Sizl UNI Shipping MODel Grl Y Duly (Ampsl [Amps) Nx W' 0 Wl/lbs.) "... • LOW PROFILE POWER SU PPLY Sl ·11A • • 7 11 2% x nlo x 914 11 C8nt lnulMIs ICS· Sin IINI ""&", MODEL Duty IAmpsl (Ampsl Nx W"D wt b< • POWER SUPPLIES WITH BUILT IN C IGARETTE LIGHTER RECEPTACL E RM SERIES RS-A SERIES RS-M SERIES ~, 0 MODEL RS·35M MODEL RM-35M MODEL RS-7A • VS-M AND VRM-M SERIES RS-S SERIES RS-4L 3 4 3'h x 6'11 x 7'/0 6 AS-5l 4 5 3'h x 6Y, x 7'/. 7 • 19" RACK MOUNT POWER SUPPLIES Conllnuous ICS· Size [lNI 'h"&", MODEl Dilly lAmps) [Amps) Hx Wx 0 Wl bs. RM-12A 9 12 5'/. x 19 x 8'1. 16 RM-35A 25 35 5'/0 x 19 x 12'h 38 RM -50A 37 SO 5'1. x 19 x 12'h SO RM -6OA SO 55 7x 19 x 12'h 60 • Separate Volt and Amp Meters RM- 12M 9 12 5'4 x 19x8 ' 4 16 RM -35M 25 35 5'10 x 19 x 12 '11 38 RM-50M 37 SO 5'10 x 19 x 12'h SO RM-60M SO 55 7 x 19 x12 'h 60 - CH till.1I IU · Siull"l n r"il, MOm Go, ,"', 0.1, lA." 1 lA• ••) II x W x 0 WI. llh.1 RS-JA • 2.5 3 3 x 4,," x 5,," • RS-4A • • 3 4 3,," x 6", x 9 5 RS-5A • • 5 3", x 6'1t x 7'4 7 RS-7A • • s 7 3lf. x 6", x 9 9 AS-78 • • 5 7 4 x7lhx 10lA. 10 AS-lOA • • 7.' 10 4 x 7", x l OlA. 11 AS-12A • • 9 12 ee x e x s 13 RS- 128 • 9 12 4 x 7 ' k x 101,>. 13 AS-lOA • • 16 20 5x9x10'k 16 RS-35A • • 25 35 5x11x 11 27 RS-SOA • 37 SO 6x 13'1ox l1 " c..u..... ICIi · Sill (III) S ~i" i'l NoOEL Oil, 1..... 1 1..·.· 1 II xW xl WI. 1 1 ~'. 1 • SwitIBbIe volt and Amp meter RS-12M 9 12 4",x Bx9 13 • Separate 'tOIl and Amp meters RS-20" 16 20 5x9x 10", RS-35M 25 35 s x u x u 27 RS-SO" 37 SO 6 x 13'1, x 11 " • separate Volt and Amp MeIers . Output Vollage ad justa ble from 2·1 5 volts . Currerl1 limit adjustalJle!Tom 1.5 amps to Full Load Culln". ICS· Sil'IINI S~I"i'l MODEL O.t, [A••II [b,11 II x Wx 0 WI. (lbs.1 @13.BVOC @10VOC @5VOC @13.BV V5- 12M 9 5 , 12 os x e x s 13 VS-2OM 16 9 • 20 5x9 xl0'h 20 1IS-35" 25 15 7 35 5x 11x 11 29 VS-SOM 37 10 SO 6 x 13'" X 11 • variable rack mount powtr supplies " YAM-35M 25 15 7 35 5\10 x 19 x 121'1 38 MODEL V5-35M VRM·5(lM 37 10 SO 5% x 19 x 12'" SO • Built in speaker - C..ll..... " ICS · Siz. (1111 n i"il, MODEL Go, 8 1 1C ~ Oil, 1..... 1 ..... II xW xD WI. 11'1.) RS-7S • • 5 7 4 x 7'h x 10"4 10 RS- 1OS • • 7.5 10 4 x 7'h x 10"4 12 RS-12S • • 9 12 4'k x 8 x 9 13 AS-20S • • 16 20 s x s x tow " " " ·1C5-lnterminent Communication Service (50" Duty Cycle 5min. on 5 min. off) CIRCLE 16 o~ READER SERv ICE C"''''O
Page 1 and 2: I • • Hams in Space!
Page 3 and 4: MFJ, Bencher and Curtis team up to
Page 5 and 6: THETEAM PUBLISHER/EDITOR Wayne Gree
Page 8 and 9: TS-680S All-mode multi-bander • 6
Page 10 and 11: • • The SAHEX STS-37 Mission Th
Page 12 and 13: telemetry on one side and Fuji-OSCA
Page 14 and 15: Number 5 on your Feed~c:knrc! Weath
Page 16 and 17: f7 ,.. '0 ' ''~, " ~H~ '~" '" " LT(
Page 18: i • Choice Selection. Nc:M' }OU c
Page 21 and 22: Introducing the only HF amateur rad
Page 23 and 24: Number 7 on your FHdback card Eleme
Page 25: KITTY SAYS: WE ARE NOWOPEN 7 DAYSA
Page 29 and 30: '. .COMMUNICATIONS ELECTRONICS INC.
Page 31 and 32: 0:: w>- >ffi - wO u'" U)Ul Z..J
Page 33 and 34: HF Equipment IC-16S Xevr/ps/keyer/a
Page 35 and 36: , • ALlNCO'S DR·590T DUAL BAND T
Page 37 and 38: , REMEMBER...A LOW COST POWER PACK
Page 39 and 40: z o ; ? « D April 26, 27, 28, 19
Page 41 and 42: tuning is common, and can be elimin
Page 43 and 44: VERSATILITY! MEASURE POWER FROM 2rn
Page 45 and 46: Amateur RadioToday SWEEPSTAKES Over
Page 47 and 48: OUTBACKERTM Chester QSL Cards e ·
Page 49 and 50: ................ PRESENTING .......
Page 51 and 52: AR models give you fTl()(e than 20d
Page 53 and 54: NOW IT'S ATAD SMALLER! (MUCH SMALLE
Page 55 and 56: • tions during daylight, so don '
Page 57 and 58: Photo C. Mall Flagg, a senior at Ne
Page 59 and 60: GORDON WEST RADIO SCHOOL I #04 ZI·
Page 61 and 62: Joe MoeII PE KIOV POBox2508 FullerT
Page 63 and 64: Never Say Die Continued from page 4
Page 65 and 66: SELECT 5 BOOKS for only $4 95 TlI Q
Page 67 and 68: Table 2. Sample of Packets ReceIved
Page 69 and 70: G5RV All-Band QuicKits ' " ",,", .,
Page 71 and 72: Heterodyne Headache #14.256 Get fas
Page 73 and 74: ~ RLC·6
Page 75 and 76: ABOVEANDSEYOND CL Houghton WB61GP S
Page 77 and 78:
Number 20 on your Feedback card HAM
Page 79 and 80:
Desert Voices Continuedfrom page 18
Page 81 and 82:
M&N ELECTRONICS All your TEN-TEC ne
Page 83 and 84:
SIMPLEX REPEATER USE ONE RADIO T" S
Page 85 and 86:
CHIL.E Robert M. Wright X06EK Casil
Page 87 and 88:
Number 27 on your Feedback card DEA
Page 89 and 90:
0J • How 10 WOn< Ihe Competition
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