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Photos I and 2 show the meter built in<br />

a Bakelite box with aluminum pan el. I have<br />

measured the resistan ce of a loading coil 01<br />

a new Hustler mob ile antenna and compare<br />

d it to my old beat-up one. I planned<br />

to bu ild a dipole out of th e two of them<br />

and wan ted to be sure everything was<br />

okay. Resistance of the probes I used was<br />

O.2n, by shorting th em together, the total<br />

reading (p robes + coil) was l. On . Therefore<br />

the coils were O.8n.<br />

Other uses will suggest themselves. I<br />

hope you will find thi s novel instru ment as<br />

useful as I have.<br />

~O~<br />

OWW-WiTEi<br />

II , . .<br />

. . .W3YCZ<br />

la tio n . Application notes and d ata shee ts are<br />

ava ilable from the m a n ufac t urer . Prices range<br />

fr o m 81.50 t o 56 .5 0 in small q u antities. E ast r o n<br />

Corp., 25 L o c u.st sr., H aver hill M A 0 1830<br />

Doubte -batanced MI C Mixers<br />

Cerasea l series , a ceramic case enclo ses t h e u nit's<br />

active la yers. A thin epo xy coating is a pplied t o<br />

the finished u.uf f or add itional prot ec t io n , Use o f<br />

the ceram ic cas e , which is f o rm ed as an integr a l<br />

par t of t he capaci tor b efore firing, results in the<br />

prod uetio r. of a truly solid-state ca pa citor t ea t u r­<br />

m g monolithic construction comb ined w it h co m ­<br />

pl e te her meticity fo r u se in aerosp a ce :hcomputer,<br />

and milit ar y ap-pli cations. A ero uo x vcrp. , N ew<br />

B ed ford MA 02 74 1.<br />

Amat eur R adio V aractors<br />

A new family of high Q vara ctors fo r a mateur<br />

ra d io se r vice in a p plication fro m i-f ' s up thro ugh<br />

450 MHz. These varactors n ow mak e pr actical<br />

ve r y compact equipm ent by re pl acin g m echanica l<br />

tuning wit h elec tronic tuning. Ama t eur u se s<br />

incl ude AFC. in cremental tuning of transceive rs,<br />

remote cont rol, and SIm plified frequency m odu-<br />

FEBRU A RY 19 71<br />

A n e w series of double-balan ced Ml C (micro ­<br />

w a ve integrated ci rcuit) mix ers combines low ­<br />

noise performance and wide bandwidth. T he<br />

mi xer -preamplifier (ill ustrated) provid es m ultioctave<br />

b andwid t hs, lo w 1M distort io n , a nd b eamle<br />

ad Scho ttky d iodes. Avai lable w it h hybrid Ie<br />

pre amplifiers as well as d iscr ete com ponent u ni ts.<br />

RHG Electronic s L a b o rato ry, I nc., 94 -,U ilbar<br />

Blud . , F armingdale N Y 11 7 35 .s,<br />

1 9 71 Te ch nical and Scientifi c<br />

Boo k Ca t alo g Availab le<br />

An SO-page ca ta log describ es over 650 h ardb<br />

ound an d paperback boo ks w hic h cover vir t u­<br />

all y ever y t ech nical and sci ent if ic discipline.<br />

Special sectio ns in the catalo g feature "do-Ityo<br />

urself" t itl es a nd amate ur rad io pub lica t ions.<br />

Vocational educa tors and ind ustrial t ra ining d irectors<br />

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Sa m s & Co. , Lnc. , I nd ian apo l is I N 4 6 z 1iB.<br />

B9

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