rf - Free and Open Source Software

LRL-66 ANTENNA
66' LONG. 10 THIU 10M
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Powe r raling 2 !CW. P.E. P. or o .... r on 8 0, AO, 15
On 20 gild 10 1 Kw. P,E.P. Trol'llm;"•• inp""
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4
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"R ICE OPERATES ON 5 llANOS AUTOMAnCALLY
sss.oo 2 I. Load;n r ~olb for 10 '" 40M d oublet o lMnltlon
I" C'Bt. 2. " d,u,t.W. encb to _t ao ....eter n.nlO.
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USA. Dlld. 3.4. o.coupllnll' u ubol for za .. 10
AlliN RADiO LABORA.TORIES
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Box 44
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_ 5. Cent........uIato••Ith !em.l. eo. . 2
....nn_. to tak. PL-:z.s. plu a
" Flttlnae on In eu l.to. e t o t l.on rope
Ow_n,bo,o. K_ntucky 42301
One that Didn't Work Out
Do n't misunderstand me. The home-brew
.oax switch I'm about to describe works fine.
it just cost more than it shou ld have, and it
doesn't do quite all that a commercial unit
Ioes, If the purpose of home-brewing is to
'ave money while producing gear eq ual o r superio
r to co mme rcial products, this project
qualifies as a failure. Still, it may be of interest.
First, you take a cat fo od can-one of the
little o nes that co ntains the so-called " gourmet"
cat foods. Open it and feed your cat
the contents. (Yo u do have a cat, don't you?)
Then wash it - wash it rery well. If yo u don't
you'll have a very smelly co ax switch !
Now, mount six SO-239 co nnectors equally
spaced aro und the o uter wall of the can.
(Use the single hole mounting t ype if you
can.) Drill a hole exactly in the center of the
bottom, mount a six position ceramic switch
with 60 degree indexing, and line up the contacts
wit h the socke ts. Note that in one posit
ion, there will be no connection, since o ne
of the sockets serves as the input t o the
swi tch. Wire it up using short lengths o f #12
wire. Cut a disc of fl ashing a little larger than
the diameter of the can, and seal up the back
by laying a bead of so lde r between the rim of
t he can and the flashing.
If you buy everything new, the switch will
cost you five or six dollars. It doesn' t ground
the sys tem in the " off" position, and it won't
handle a kilo watt. For about five dollars
more, yo u ca n buy a switch that does. However.
crosstalk is low in the home-brew
switch, and if you have eno ugh coax co nnectors
and a suitable switch in the junkbox, it
may he up your alley. Works fin e for switching
between antennas, dummy loads, transvcrters.
etc. If your junk box doesn't contain
the necessary parts, take my advice - go buy
a commcrcia l unit.
There's a mo ral in this somewhere...so met
hing about the point of di mi nishing returns?
Bo b Grenell , W8 RHR
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THE BEST
6 METER
CONVERTER
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Model 407
$34.95
ppd,
50-52 MHz in. 28·30 MHz out
or 52·54 MHz with a second crystal
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Can ' t wa it '! Then sen d us a postal m oney order
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NOTE: The Model 407 is also available in any
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VANGUARD LABS
D ~pt. H, 196·23 Jamaica Av~.• Hollis. N.Y. 11423
( ~ 11/111/
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" O K . so to m orro w y ou ge t your o wn
Ifa nsce ive r! "
MAY 1969
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