Frequency re-allocations are coming sooner than we thought possible. We are not prepared. The ...

100 Pages·2009·26.24 MB·English

•
March 1964
Same Old 40c
G E N E V A I N 1 9 6 5 ?
Frequency re-allocations are coming sooner than we
thought possible. We are not prepared.
FCC D O C K E T DUE I N M A R C H
The FCC's answer to ARRL's RM-499 should be out
this month. Keep your fingers crossed.
A R R L LOSES V O T E
The results of last months cover ballot show 83 1/2
per cent of the amateurs opposed to RM-499.
BROADCAST
For over 30 years UTe has been the leader in
HI·FIDELITY
advancing the art and technology of iron core
in ductance devices ••. The Linear Standard (LS
HAM
type) units are the highest quality, non-hermetic,
high fidel ity transformers of their type. This series
COMMERCIAL
includes transformers designed for t ube, transistor,
hybrid, modulation and matchi ng applications.
With the ever increasing use of wide range equip
ment, the point has been reached where the major IMMEDIATE DELIVERY
limiting factor is th e frequency range of the trans
From Stock
formers employed. These LS components represent
the closest approach to t he ideal transformer from
the standpoint of uniform frequency response, low
wave form distortion, high efficiency, thorough
.,.
shielding, and dependability.
to
l.S~
_. .r --.""..,".,.,.~.t
- ~ .
LS SERIES ."'".".. ,.", ,...,.." I
.~
freq, Ma<.
'Il ,.,
......
,
TRANSfORMER Pri. Sec. Range Level - " '
-
_-",~-::-
TYPES Range Range 1 db Range ..
P. P. -+- ..... ...
..
.,..,
+
Low Imped, to 2.5 50 7 '\, 15 dbm
Grid and Mixing to to to to
•
+
and Matchinr; 5,000 120,000 50 KC 23 dbm
5,000 50,000 10 '\, 100 mw
lnterstage
to to to to
•
and Driver
30.000 135,000 20 KC 40 W
+
150 150 20 '\, 15 dbm
Hybrid and
to to to to
Repeat Coils
+ LINEAR STANDARD
600 600 40 KC 18 dbm
HIGH SHIELDING
Plate, Crystal, 4,000 50 7 '\, 200 mw
Photocell, and to to to to DIE CAST CASES
Bridging to line 30,000 600 50 KC 400 mw TOP & BOnOM MTG.
50 1.2 10 "- 20 W
High Level
to to to to
Matching LS·1 CASE
600 600 40 KC 40 W
3Y."
l ength
8 500 7 '\, 20 W 2Ye"
Wi dth
Output to Line
to to to to Height 3~"
and Voice Coil
Mounting 1IX. x 2~'"
10K 1.2 50 KC 60 W
Screws ................•...............6·32
3K 6000 10 '\, 20 W Cutout 1Y." d ia.
Unit We ight 3 Ibs.
Modulation to to to to
!O.4K 1.2 50 KC 2500 W
Wrife for lafesf cafalog 01 over 1.200 STOCK ITEMS wi'" UTC hig" reliabilify
UNITED TRANSFORMER CORP.
150 VARICK STREET, NEW YORK 13, N. Y.
PACIFIC MFG. DIVISION: 3630 EASTHAM DRIVE, CULVER CITY, CALIF.
EXPORT DIVISION , 13 EAST 40th STREET, NEW YORK 16, N. Y. CABLE, " ARLAB"
The little Punch on VHF . . . . · . K5JKX 6
7 3
Transistorized RTTY Converter . . . . . · WUJl. 14
Magazine
. . .
M odulation M easurement . . . . . . . · . K5JKX ... 16
W ayne G reen W 2 N SD / l 144mc Transistorized Converter W3HIX. 18
Ed itor, etcetera
Biasing Tubes . . W28DG 20
Six Mete r Transistor Re ceiver . . . . . .. .. W5JSN 22
Speech Compression for Mobile .W 7SM C. 28
Mobile Power Supply . . . K6BIJ 30
. . . .
M arch, 1964
Neatness Does Count . . . . . . . . . . WA2BWG . 32
Vol . X V I I, No. - 1
% Meter TV . . . . . . . . . . ... ... · . K20PI 35
,
Swon Transceive r Modifications W5TOC . 36
Mobile Rig · .K5JKX 40
Transmission lines W5EUl 44
Modularization · . K5JKX 46
Transceiving High-level Mixer W2KPC 48
Electronic Filter Capacitor W2RWJ 53
More Gain for the SX-140 W2HTN 54
Rig Hr Is Homebrew, OM W5HJV 57
Superhet or Regen K6BIJ 58
Getting Publicity W4WUQ 60
More Comments on RM-499 62
Aldabra ...... VQ9HB 64
10AR Tour . . . part II . W2NSD/1 74
73 ~Iagazine is published monthly
by 73, I ne., P eterborough, N. H . Outstanding Amateur 95
T he phone number is 603-924-3873.
Subscription rates have just been
hiked (after considerable warning) to
$4.00 per year. $7.00 for two years.
$10 for three years world wide.
New Products 27,85
Second class postage is paid at
Rtty Docket 34
Peterborough, N ew H ampshire and
4UlITU , 39
at additional mailing offices. Printed
in the U .S.A. Entire contents copy R M·499 86
right 1964 by 73. Inc. Postmaster :
San Marino 95
please send form 3579 to 73 ~I3ga·
zine, Peterborough. N ew H ampshire.
MARCH 1964 1
What • the ARRL?
1S
Who • the ARRL?
IS
What does the ARR L do?
What should it do?
There a re st ill a few fe llows who have either The directors d ecide upon th e president and
skim med over my editorials or just not read vice president. Unfortunately this proce ss has
th em at all, that fed that I have been attacking been carried out at secret pre-board meetings
the ARRL and perhaps want to put them out by the Di rectors and the real facts entering
of business. I do wish these nit wits would into the selection of these officers have been
take a little time off from Happing their mouth kept hidden. Since the p resident can be dis
to run their eyevballs over my editorials and missed by the d 'rect ors without appeal to th e
make themselves aware of the adulterated hog members he has little power and historically
wash they are putting ou t. has been merely a figurehead.
Xow, to the AHHL. Have you eve r given
\ \'110 then actuall y runs the League? Let's
milch thought to what the AHRL actually is?
look furth er. Let's take a look hack into h istory .
Let's take a look at it .
T he AHHL was set lip lry Hi ram Percy
The primary activity of the ARHL is to
Maxim . Maxim was a genius, by the way, and
publish QST, the H andbook and other assorted
he set up the League very cleverly. The elec
publ-cattons. As a publishing house it is quite
tions of th e directors gave the members the
successful. The League also p rovides a wide
feeling of p articipation and permitted the
ran ge of services to the amateurs such as
drawing of broad parallels w ith the U. S.
managing the QSL Bureau, issuing cartificates,
govern ment setup and looked at first glance
maintaining th e Honor Holl, BPL, d istributing
like a democracy. But Maxim kept a tight
films to clubs. running \VIA\ V, send ing out
hand on the reins and never let his "democ
messages through the Official Broadca st Sta
racy" get out of control. \Ve call this a dictator
tions, etc.
ship today. Many dictatorships work out very
T he League employs a counsel to aid it in
well as long as the d ictator is benevolent. The
submi tting proposals to the F CC and to pro
problem always comes up : when the dictator
vide legal references for lawyers representing
dies, where do we find another benevolent dic
amateurs who are having d ifficulties tied ill
tator. T he 1I00mal system is for the power to
with am ateu r radio.
fall into the hands of an underling who has
The League is supposed to he run by the
worked himself up with just that power in
Board of Directors. Unfortunately the Board
mind .
gets together only once a year and each Di
1\:. B. W arner replaced .\Ir. Maxim. I wasn't
rector is only in office for two years unless he
in a position to know what was going on on the
is re-elected . This means that each D irector
inside ill those days, hut I do note grumb les
look forward with con fidence to hut two
CUll
and complaints still with us from those years
meetings. This is an extremely weak point in the
in letters from old timers who were in a posi
makeup of the League and may be largely re
tion to know.
sponsible for the lack of representation felt
Budlon g was in th e driver's seat when I be
hy many members.
gan to become aware of the world of amateur
radio politics. Discontent reached an all-time
high under Budlong and the League's stature
reached the low point which brought Dock
Oil
de
et 929.::5, the F CC proposal which virtually
ended the League's representation of th e ama
teur before the FCC. Budlong was the Editor
of QST and the Secretary of the League.
W2NSD!1
The system for getting favorable directors
never say die 2 73 MACAZINE
,
"
S I N G L E
S I D E B A N D
F I L T E R S
• 9 me cent er frequency
• Bandpass 6 db 3 kc (approximate)
ACF-2 Two-crysta l fil ter circuit
using low im pedance link input
and 2K resistive out put load.
-
U nwa nted sideba nd r ej ect ion
great er t han 30 db. $9.95
ACF-4 Four-crystal filter CIr
cuit using nomina l 600 ohm
input and out pu t. Unwanted
sideband rejection great er than
40 db. $18 .95
ACF-6 Six-crystal f ilter ci rc uit using nominal 600
ohm input and out put. Unwa nted sideband reject ion
greater t han 55 db. $27.95
MATCHING OSCILLATOR CRYSTALS for t he ACF
fil ter series. Recommended for use in OS-4 osc illator.
CY-6-9 LO $4.40
CY-6-9 HI $4.40
05·4 Crystal Osc illator $6.95
5 E-6F Mou nting Case
Special AOC case for mounting filter plates.
$5_50
* Add-On-Ci rcui t
Internat ional Crystal Mfg. Co., Inc.
18 North Lee, Oklahoma City, Oklahoma
Please rush 1964 catalog.
Name =~=;c_o==c_----
PLE A S E P RI N T
Address _
Zone
City
MARCH 196'1 3
re-elected seemed to be worked out to about
perfection and though I believed that amateur
radio would be the winner if Bud were re
placed, it took a while before the opportunity
came along to help. Eventually it did and in
a short while Bud's retirement was announced.
STRENGTH
The vacuum created brought on an inter
esting power play among some of the direc
tors. This was largely responsible for the un
settling events of the last year which culmin
ated with the secret submission of R~I-499 to
the FCC. This, as our poll and the response
to the FCC has shown, has been immensely
THREE REASONS WHY
un popular and the tidalwave of resentment
YOUR BEST BUY IS ...
which has resulted seems about to bring on
another shuffle. Rumors from responsible
E-Z WAY
sources tell us that Hoover, having learned
what he has gotten himself into, will shortly
S~tte;\601t
tender his resignation . There is some question
in my mind about how much influence com
E-Z WA Y AERO-DYNAMIC mercial intersts may be able to exert to pre
design decreases wil1d load
vent this from happening.
and . provides telescop ing
\Vhich brings us down to today. \Vhen ama
action t hat permits raising
teurs write in and tell me that everything is
and lowering of tower sections.
CRAN K UP TO 60 FE ET. going to be OK, that the ARRL has been
DOWN TO 25 FEET and
leading us for fifty years and we should. all put
TIL TS OVER FOR ACCESS
ou r support behind the League, I wonder
TO ROTO R OR BEAM.
what they think the League is? who are they
TRENGTH built-in to
IS
supporting? \Vhat policies? whose policies?
every E-Z Way Tower.o.Heavy
Who is in charge today? Hoover? Huntoon?
w all s teel I bing legs, e e n
tinlJous diagonal bracing of
Handy? Houghton?
solid !i te,,1 rod and elee tr Ie
I don't trunk so.
ca lly w e lded t hr o ug ho ut. ••• no
loose bofts or nuts here. E-Z
When Mort Kahn W2KR (K4 KH) was
Way ign ond streng th ore
05
elected as a director I expected him to end up
DEPEND.
your assurance of
AB IL IT Y that you con count as Secretary of the League in short order. He
on year after year. See yo ur no doubt could have, but instead he organized
nearest dis tributor today or
the directors and. masterminded everything
write for free li tera ture.
through his position on the Executive Com
mittee. This left the burden of the ad ministra
The SATELLITE
tive d etails in Huntoon's hands and the reins
MoO.1 RBX·60-3P (Pa;nted) S335.00
in Kahn's. Mort was, I believe, largely respon
Model RBX-60-3G (Galvan ized) $410.00
sible for the d ecision to move to a new head
MOUNTING KITS:
quarters, to build a new headquarters building,
GPK X60·3 (Ground Post) $ 125.00
and to get the members to donate to the build
BAK X (Wa ll Bracket) $17.00
ing fund . He also seems to be deeply involved
Fre1l ht Prepaid anywhere in (48) U. S. A.
Other Towers from $99.50 to $1995.00 with the incentive licensing hassle and the
R~I-499 petition.
If Mort follows through on his reported de
cision to not seck re-election as Hudson Direc
tor this will throw the ball back up in the air
again. Mort seems to be pretty happy now that
he has moved, yacht and all, down to Florida
so it is possible that he will wave goodbye
to the tumult and responsibility of amateur
politics.
Perhaps you think I'm all wet. You can find
out about much of thi s if you contact any
P. O. BOX 5767 TAMPA 5. FLORIDA (Tu rn to page 78 )
4 73 MAGAZINE
cash in with
HAMMARLUND'S
--I-:")
_.
:t
0
3:0
0
" - 0
.II.>. _' c.
_.:-:; JJ
x "_.
'O~
:::I
" 0 -
_.
= > 0
~
c. ... >;
" 3
~ :::I
... mill e:
- "~
~ 0. ~ l'tQ..
J:I
BILL
~ ~ 0-'
o~;.
c-
-" 0
::0
-"' .c
- '" ... II>
r-
rn 'C n'C
c::
. 0 C
II>
"' > ~3 ...
'" c:
.
• 'C n
.II.>. _::r-
J>~
. -11> .,
~
0. '" 0
You read correctly. II>..II.>..
_
>;
- 0
This certificate is worth exactly $25 toward
::r-.,
the purchase of an outstanding HQ-IOOA
N=
""' ::t:
general coverage or HQ-IIOA Ham Band
6:-0
,
Receiver complete with 24 hour clock-timer c
...
0
and the high quality S-100 speaker.
n 0
0>
Just cut out the Hammarlund-Issuc $25 bill n
and present it to your nearest Hammarlund
distributor for the BIGGEST Amateur Radio
Bargain of this . . . or any year.
Don't delay. Th is offer is limited to the
continental limits of the U.S.A . and is good
o nly until March 3 1, 196 4
HRmmRRLUND
MANUFACTURING COMPANY
A GIANNINI SCiENTIFIC COMPANY
53 Wes t 231'"d Street, New York 10, N .Y.
Cable Address: SUPERPRO
5
MARCH 1964
The Little Punch
VHF
on
Jim Kyle KSJKX
J im Speck W 5PPE
The requirement-sa good rig for VIII" use, The whole thing started one warm night
with m inimum cash outlay for a top -notch when co-author \V5PPE asked K5JKX, "Why
signal. aren 't you on tw o?"
The res ult-a little puncher wi th measured Answered th e other Jim, "No rig."
H4.perccnt efficiency ( !). incorporating rf sec " How's your junk box?" asked Speck.
tions, modulator, and power supply all on a "Let's go look: ' said Kyle, and that was the
IOxl 7x3 chassis. Though the signal rivals that beginning.
of much larger rigs, it takes on ly 2,l) watts of A comprehensive search of the garage (one
d e input to the fin al. It incorporates audio dip huge junkbox ) yielded a 2,50 volt plate trans
ping and filterin g, with lip to 30 db of clipp ing former of unknown vintage, a 10x17x3 chassis
available when conditions warrant. It also in somewhat resembling a chunk of swiss cheese,
cludes all control circuitry for the complete a 20 watt modulation transformer salvaged
station. Interested? Head on . from Collins surplus. a 6 amp 6 volt filament
First let's talk about that 8-t-perccnt fi gure. transformer, a couple of 800P IV silicon d iodes.
\ Ve d on't really believe it either, but th e cali uud miscellaneous small items, incl uding a
brated Instruments we checked it out w ith large sheet of perforated brass.
showed 2.5 watts in. 26 watts forw ard powe r, The search theu moved to the \ V5PPE
and ,5 watts reflected . This means a net power QTH, where most of the remaining parts ( in
ou tput of 2 1 watts for 2;') in, or 84 percent eluding the 6360 ) were located .
efficiency. Actually, we think that th e calfbra Upon looking at the mutilated chassis, the
tion tolerances sort of all added up together thought struck. \Vhy not make it a "modular"
to give this figure, and the tru e efficiency is rig, so that everything could be bu ilt p lates
0 11
probably som ewhere about 75 percent-hut separate from the chassis and plugged in . This
this is still a whale of a lot higher than the 55 was done, and has worked out nicely.
60 percent usually considered ncceptnhle at At the starting point, the rig was divided
14-t me and above. into three major mod ules: rf deck, modulatory
power supply. and control circuits. The control
ci rcuits were built into the chassis. T he rf deck
was built on the sheet brass, and till' audio
power module was assembled on a sheet of
structural-grade aluminum which came to
light aIon!!: the way,
.
.
• Notes on Figs. I a nd 2
• '-
Ll C I, L2C2-resonate at 24 mc coil forms
M iller 4300 red core
L3C 3, L4C4-resonate at 72 mc coils on
Miller 4300 white core
L5- 3 turns Airdux 60 8
L6-2 turns Airdux 60 8
Com plete transmitter, fu lly assembled. Va C5, C6-15 pf min. bu tterfly
cant spa ce on rf module wi ll be occupied L7-Line, 6" long 1" wide #12 wire
by 432 mc tripler, to be added soon. De C7-duol 8 pf Bud variable
ta ils on it after it's in use . C8- V2-4 pf piston trimmer
•
73 MAGAZINE
•
, ", "
N• •N
>-~"
r- r-
~
'T
•
'''n.
,,'
.. • •
~m
0 •
• • • ---- -_.-
• <0
2 o -
~
• N• <0
> >
•
•
0
•
.. N
, • N ,
~ , ,
x • , ,
, • • ,
"
-
-N
"
•
·'H
-,'
>
"
•
• ,
"
•
•
• ~r:lY
0
•N
~
o
•
N
2
•
~/ >
•
.r ~,~ ; •N
~ •
•
21
- ' "
N•0 N
e
•
.•N
>
•
•
x
•
o
o w
•
• <r
,
•
~ :>
5" "
"
0
>~
• '1"
0 - , • •
o ,, • •2 w•
•
<,0 1 , •
~
,
~
• ~
>
• ,
,
N
f~ : 't~--l
•
•
g
,>
"
•
,
~~,
,
Q
, I ,
,
U , 1;''1
<0, Q , •
"
•
~
" • •
•
~ .
~ ~
•
•
•
0
~ •N
o
• -,,"
•
>
j: N•
...
.
~ , ~ ~
ft---l"
. [ ~" -,
~ . ~g
II
N, •
:; ~ .. •
x •
T ~ •
E-J!'
m • N 0 <> ••
oO ' Po~"
'" • '"
'" •
• <,0 '" • >
"-
Q .i N <
u if /. " " '0 '"
• " ':;" x <":
<0, , ,
~ ~
~, •• •" >'-0u"0">=' ." .. .:".. "
•
" g <:
ftE . 0 .' - •
", 0 :> "U
~---"" -.. _~."'.o o '"
I'' + o+: ~ ~ o o
_ ~:I'Z
• > , , , , , , , , ..,. ..,....,.
, ~ ••
, -"' .., ~ "'
- -I"
•
"
7
MARCH 1964
gang seems to like it best with the pot about
halfway open, which is ap proximately 10 db.
T he grid -return and biasing arrangement
OIl
the cathode follower might have been a bit
different had this not been the result of a late
modification as mentioned earlier. \Ve simply
lifted the ground end of the cathode resistor
and the grid return to a tie point, then took
the plate-load resistor and moved it from the
plate circuit to go between this tie point and
ground . It seems to work nicely, with no par
ticular pains taken to optimize the cathode
follower design.
The cathode follower feeds a rather con
ventional 6AL5 dual-diode peak clip per; clip
ping level is set by the 250K pot from the
most-filtered de source to ground. \Ve used a
Top view of rf module showing details of
subminnture pot because we had it on hand;
high- efficiency plate line and fanning wire.
any kind will do nicely as there is virtually no
power d issipated here. No bypass is necessary
Original plan was for Speck to bu ild the
because the 47 K resistor to the plates isolates
rf, Kyle the audio/power, and both to work
them and the dc line is filtered rather heavily.
the con trol portion. T he design was carried
0 11
out on this plan, but somehow it all ended The clip per feeds a low-pass filter which
lip getting built by Speck! In return , the work was taken from the ARRL handbook almost
of writing it up fell to Kyle- so send your com. without change. The Merit C-2985 is a 20
plaints to him . hen ry, 15 rna choke, and we have used it
First came the audio/power portion; the many times in this circuit; no substitution can
schematic for this appears in Fig. 1. It's large be guaranteed. Using the 270 mmfd mica ca
ly conventional, but has a few u nusual points pacitors ShO\\11 gives a cutoff frequency of
here and there. One is the lise of a 6CIO Com 2500 cps, which is about right for natural
pactrcn triple-triode as the p reamplifier. At balance. The low frequency components have
first, all three triod es were used as amplifiers, already been trimmed back by the 500 mmfd/l
but distortion was extreme. Changing the third meg grid capacitor/resistor combinations in the
section to a cathode-follower so that the clip. 6ClO stages.
per would be d riven from a low-Impedance Following the filter is the phase splitter;
source cured this p roblem.
Originally, also, the 6ClO plate supply came
from the 250 volt power supply in the same
module, through a hefty dropping resistor/
bleeder combination. However, with this
hookup the audio took .:i seconds to come on at
the start of each transmission ; apparently the
decoupllng-fi lter time consta nt was wav too
l~ad
long. Rather than cha nge resistors, the to
pin 4 of plug No.1 was added, to steal power
for the preamplifier from the receiver power
supply located in the control section.
Note the clipping depth control ( 1 meg pot )
between the first two sections of the BCIO.
T his is located on the front panel, and by rights
should appear in Fig. 3; however, since it's
such an integral part of the preamp it is shown
here instead. T he 47K resistor from the bottom
of the pot to ground allows the control to be
turned all the way "off' to remove clipping,
without killing the audio. With the control all
Bottom view of a udio/ powe r module, show
the way "on" and a high-output ceramic mike,
ing nothing in particular except general lay
you'll get about 30 db of clipping. The local
out we used.
8
73 MAGAZINE