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Coaxial Microwave News-The Improved GR874 Slotted Line THE GENERAL RADIO Experimenter VOLUME 40. NUMBER 8 / AUGUST 1966 IET LABS, Inc in the GenRad tradition www.ietlabs.com 534 Main Street, Westbury, NY 11590 TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988 Volume 40 · N o.8 A1.lgust 1966 the ~ Experimenter Publlehed monthly by the General R adio Company THIS ISSUE _________________...., Page The Improved GR874 Slotted line ............. ,................. 3 Impedance-Malching Tune" for Precision Coaxial.Measuring Systems... 6 TEII"Mode Resononces in Precision Cooxial Connectors. .. 10 New Decade Copocilor-Wide Range, High Resolution . .. 14 A 1O·pF Reference Standard Capacitor .•....••..•••.••...•••..•.. 17 Increased Frequency Resolution for Wove-Analyzer Recordings of Vibra- tion, Acoustic, and Electrical Signols ... •... ...................... 18 locating Submarine Cobles ..................... , ............... 21 GENERAL RA 0 I 0 COMPAN Y We s t Concord Massachusetts 01 78 1 NEW ENGLANO C HICAGO 22 O.k.r Av." .... 5605 W ••' North A"."u. W •• ' Co"cora, M •••• c" ....It. 01701 Oak Park, UII"ol. 150302 METROPOL.ITAN NEW YORK DAL.LAS OrO.O Av.n ....ILlno." 2600 S iamma". !"r•• w.y. 8,,1,. 210 Rlog.fI.ld, N.w J.r•• y 0715$7 0.11 •• , T.x •• 75207 PHIL.ADELPHIA Port W •• "lng'o" Inou.trl.1 p.rk • LOS ANGELES port W •• "Ing'o". P ......ytv."I. 1 803" 1000 No"" Saw.ro SI.... I WASHINGTON and SALTIMORE 1.0. A"II.I •• , C.Ulo."I. a0038 11"20 Rockvm. PI". RockvIII., M.ryl.nO 20852 SAN FRANCISCO ORL.ANDO "3 I! ••t Colo"I.1 Drlv. Orl."oo. Florio. 32801 • TORONTO SYRACUSE 119 !"lor.1 P.rkw.y Plclc.rO O"UOI"II. E. ••, MoUOy Ro TOro"lo 1 15, O,,'.rlo. C.".". Syr.cu ••• N.w Yo.k 1321' CL.EVEL.AND MONTREAL 5579 P •• rl Ro.d 1255 L.ln:! 80"I.v ..... CI.V.I.nO. OhIO ""'28 Town o f Mt. Ray.l. Qu.b.c. C." .... R .... lr ....... Ic •• • r• • v.U.bl ••t I" ••• afflc • • GENERAL RADIO COMPANY (OVERSEAS), 8008 Z .. r lc". 8wll~ ••I ."d GENERAL RADIO COMPANY (U.K.) L IM ITED. Oour... I!"d. O"ckl"II".m."lr• . I!ng •• " .. RI!PReSENTATIVES IN PRINCIPAL OVI!:RSEAS COUNTRIES IET LABS, Inc in the GenRad tradition www.ietlabs.com 534 Main Street, Westbury, NY 11590 TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988 THE IMPROVED GR874 SLOTTED LINE The slotted line is the traditional also be used as a precision phase shifter workhorse of the microwllve measure­ a nd as a wavemetcr ment industry. It ca n be used to meas­ The slotted line can also be employed ure a great number of parameters, over for accurate sweep-frequency measure­ an extremely broad band of frequencies ments of vswa', performing the function of a rcflectometcr over II. wide frequency and with good accuracy. The slotted range. line has its own internal impedance OR manufactures two slotted lines, reference, an accurately constructed one based on the ORS74 connector, the coaxial line, which is essentially free other on the 0 ROOO precision connector. from aging effects. It is used to measure The OR874 line, while not so accurate Vb\\'R, reflection coefficients, trnnsmis­ as the precision type, is satisfactory sion coefficients, impedance, and ad­ for most cveryday measurements, and mittance (resistance, ind uetnllce, and thousands a rc now in use throughout capacitance) of both passive and active the world. It is particularly well suited networks (diodes, tubes, transistors); to the student. laboratory, where its electrical length of two-ports; phase modest price is a boon to the budget. delay; insertion loss or attenuation of The OR87.. Slotted Line has recently networks, cables for example; and die­ been redesigned to reduce the residual lectric constants of materials. It can \'SWR, to increase the high.frequency range, and to impro .... e tbe constancy of 'R.II. s.ble. L. J. SmiU.. "Studletol Cold-T ... PNc:e. dUrM U-' III th, l)e.. ~loprIIetlt 01 the 1.-40111 c.......t probe coupling. The model number has ",.ad AmoWl ..," BTL Inter1llo1 Reporl. No :<'1 ~1-43-2S43-7. p R; BeUTelep!toae L-abon,wri ... Lau",ldale. Pe. been changed to Typt; 874-LBB. Over 3 IET LABS, Inc in the GenRad tradition www.ietlabs.com 534 Main Street, Westbury, NY 11590 TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988 the[;jExpe rimenter John Zanv received his Yi"- UIIY line, OR900, and Amphcnol B.S. in l>hysica from 7-mm Precision Connectors. George Washmgton Uni­ versity in 19'18 and his Performance M.S. from Tufts College in 1950. Io'rom 1950 to The VSWR of the line has been re­ 1900 he WIUI engaged in duced. The \'SWR specification (Figure the design and develop­ mentof radar, antennas, 1) applies with either end of the line as and microwave devices the source end. A series of representa­ at Trans-Sonics, Hughes Aircraft, Avco, and Ray­ tive residual VSWR'S of t he line equip­ theon. He is a member ped with adaptors top other opular con­ of IEEE, Sigma Xi, Sigma Pi Sigma, and a member of the nectors is shown in Figures 2, 3, and 4. Precision Connector Subcommittee of IEEE The frequency range, formerly cover­ and Committee JS-9 of JEDEC. He joined the Development Engineering Staff at OR ing up to 5 GHz, now ex tends to 8.5 in 1963 and is Section Leader in the Micro­ OHz. The low-frequency limit is not wave Group. fixed at 300 :'11Hz ; it can be extended downward, typically to 150 :'11Hz, by the past several years many mechanical the use of air lines and the appropriate improvements have also been incor­ probe tuner. porated, and, recently, an externally adjustable probe tuner has been offered Recommended Accessories as an accessory. The improved locking A convenient power source for slot­ connector, TYPE 874-BBL, is used at ted-line measurements is one of the OR both ends of the slotted line. Unit oscillators, which are available in These improvements result in an several models and offer a wide choic extremely versatile instrument with of frequency range and power supply. more than adequate performance for a The detector can be a conventional general-purpose line. This line can be slanding-\l'a\'e indicator or one of the converted to use any of the popular UG GR TYPE DXT Heterodyne Detectors. connectors in a matter of seconds, Probe tuning ca n be accomplished through a TYPE 874-Q low-\"swR adap­ with the T\'Pt! 9(X)..DP Probe Tuner or, tor. These adaptors are available, both if the convenience of external probe­ plug and jack typE'S, for Types B~C, C, depth adjustment is not needed, with a UN , LC, LT, ?o.Iicrodot, N, OS'\I, SC, T:\'C, Typj,; 874-D20L or -D50L Stub. Ii. complele meo,urlnll auem­ bly, con,lllInll 0' the 1m_ p.oved ItoHed tin e, a Unit high_freque ncy ooelltotor with pow .. suppl y, and 0 Type ONT Oetedor . • IET LABS, Inc in the GenRad tradition www.ietlabs.com 534 Main Street, Westbury, NY 11590 TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988 1.100 I V - - v .~ - f Ig .... I . Typ. '74-lB8 - 'ISWI. • SP£DFlCATlON v ..... l ! .- '--- - -+ > I V """"--.,¥ _ ~ .::.t- ... I .~ , - • • , , -• "(O"tNe.·~ ... • " .- ,,~ " ...... >r;0 ~"' > - • .M. -:''::: •> • ......~. ~ . ~ J.i • , i ,- ,. I.a.o .. ~ 1,000 , 0 , • , • • • 1.'.0 , 1.1.0 1.1 .0 "~". m~ : 1.100 ': '.0.0 Fig ",.,. 2, 1 and 4 . ......... "' ..11" ....l d ", .1 VSWI . , tho Typo .7.. _l all oqulpp. d wit h '060 ~ .- .. d .. p' .... '0 o the< 0.. .. 101 c'''"'''o. typ. " lOOOff'.m. k~ ;:~;:::;;:::;::~~2 3 4 :::;~:':;5 & .. .J! Other useful accessories: the TYPE Last, but. by no mea ns least in im­ 874-LV :\Iicrometer Vernier, which portance, arc the Tn'E 874-Q Adaptors allows a precise ndjustment of probe­ mentioned above' With the TYPE carriage position nnd is pa rticularly 874·LBB Slotted Line nnd a complete useful ill the width-<lr-minimum method set of these ndaptors, lhe equivalent of of VSWR measurement and in electrical 23 slotted lines can be obtained at a ,..tcnglh measurements; the TYP E 8H­ total price of $771 .25 .\1 L Coml)()Ilcnt 1\1ount for measure­ J. ZORZl" ments on lumped elements. • 8M the OR 0&1.&111111' uk fo... OOlnl>iele 1411111 5 IET LABS, Inc in the GenRad tradition www.ietlabs.com 534 Main Street, Westbury, NY 11590 TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988 the!;]Expel'i IYle n tel" SPECIFICATI ON S CI..... acl.'I"I~ Impada .. ~.: 50 n ::0.5%. A .<I.. o.l.. I ... ul.ad, TYPE OOO·DP 1'1010_ "'ab. f'.... 1: 50 em. Seale in centimeter1l; Tuner, recommended, or Adjult.able Stub each division ill I mm. (TnE 874·J)20L) for tuning tbe cryaW Seal. Ace".acy : :1::(0.1 mm + O.OSq.). rectifier lI'ben audi~rrequenty detector or F,aq" ...~y la .... , 300 ~IHI to 8.5 Glb (uasble microammcter is used; llUitable detector and to \) GliI). At 300 ~lIb, the alotted line covers generator; one each, TYPE 8N·HZZLA and a half wavelength. Operation below 300 :-'IHz TyPl': 874-ItZZA Pakh Cordi!, for generntor and ill poB!l!ble by uae of length! of Tnt: 874 detector oonnectioOll (patch COrdi are BtIpplied Air Linea with Type 0:\'1' Detector and G R Unit Canllon.y of '.alo . Pickup: ::1.25'1;. oecillators ). 1 .. ldual VSWII:: Leal than LOI + 0.0010 Pen. Dlm .nllallil Width 20, height "j.i, depth 3}i in to 7.5 GII&; leu than 1.10 from 7.5 to 8.S (GOO, 115, 89 mm).
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