Gift to

detector. Be sure receiver is
sw itched o ff before beginni
ng th is modifica tion! Part
G is not recommended unless
AM detec tion is o f paramou
nt impo rtan ce. I assume
no respon sibility for
damage resul ting from this
modi fication!
• Mo un t a n SPST switc h
conveni ent ly f o r use.
• Con nect one lead fr om
t he sw it c h t o c hass is
ground .
• Conne ct other sw it c h
lead through a 10-0 hm resisto
r to pin 9 of IC301.
Make certain that yo u have
correct ly ide ntified pin 9.
M easu re vo l t age w ith a
VOM to double-ch eck th at
there is no signif ica nt vo ltage
present which could
damage t he IC by grounding
the pin. Be extre me ly
ca reful while so ldering; the
IC paths a re ve ry close
togethe r, a nd the IC is easily
destroyed by accide nta l
vo ltages o n th e w ro ng pins.
I know fro m sad exp eri ­
ence !
The K1 00
The Kl00 offers considera
b le i m p r o v em e n t
o ve r the ea r l ier To uc h.
Mo st o f the sho rtc omings
of it s pred ec esso r have
bee n co rrect ed, a nd th e
genera l alignm en t recommen
d a t io ns listed be lo w
a pply equally well to its bigger
brothe r, t he K500. No
tests w ere perform ed on th e
new M100, but it ma y be
assum ed that the procedure
wo uld be simila r. To
program t he Kl00 beyon d
it s advert ised f req uency
ranges, press th e decimal
ke y before e ntering t he
d esired frequ e nc y. Algorith
m ra nges d isplayed a re
approximately 10.19-92.10,
131.1-213.015, a nd 372.737­
576.875 MHz. By ca reful
rea lignme nt, t he following
ranges w ere actuall y rece ivable
in our test unit (vco
slug inse rted): 15.2-53.8,
136.1-1 74.7, an d 387.0-502.5
MHz; (vco slug re mo ved) :
20 .65 -66.1 4, 1 41 .56-187.0,
a nd 403.2-539.6 MHz. The
Photo D. The M 100, newest in the Regen cy line, fea tur es straight fo rward, co mpa ct
design.
vc o co il is located und er
the top shie lded com pa rtme
nt, towa rd t he front of
the cabinet.
Aft e r sett ing th e vco slug
so tha t the squelch bre a ks
at the desired upper a nd
low er li mi ts o n eac h band ,
proceed with the rf alignm
ent.
Rf Alignme nt
• Monito ring a w eak signal
f ro m a signal generator set
to approximately 45 MHz,
peak the two coi ls located
und e r t he fu se fo r best
quieting (m axim um signal
stre ngth).
• Mo nito r a signa l near 165
MHz a nd peak the three
co ils in a line loc ated near
the a ntenna jack . Peak ad ­
ja cent trim po t near 150
M Hz . Altern a tively, t he
t rimpot may be peaked
nea r 147 M Hz for best
2-me te r rec eption (Note :
High-ba nd t rac king is o nly
about 6 M Hz w ide, facto ry
set fo r 155-163 MHz, approximat
ely.)
• Loc ate th e two trimm er
capacitors ad jacent to the
o pen 1-turn coils. These are
the U HF trim me rs. Tune in
a weak signal near eithe r
470 or 492 MHz (whichever
is m or e act ive in your locatio
n). Peak the two tr im me r
ca pacitors for best q uieting.
Locate th e shielded
trimmer ca pacit or and pea k
it for best signal near the
minimum capacit ance sett
ing. Peak th e ad jace nt
trimpot near 420 MHz. The
a lignme nt ste ps sho uld be
repeat ed until no improvem
ent is noted .
AM Detection for the Kl 00
Ag ain, as point ed out
with the Touch AM modificat
io n, this f eature is only
mode rate ly success ful, bu t
if se lectable AM is vita l, it
will work in a p inch .
Co nnec t a n SPST switc h
in series w ith any conveni
ent capac it ance of fr o m
.01 to 1 mic rof a rad betwee
n pins 3 a nd 5 of IC301,
t he i-f c h ip. Wh e n t he
switch is closed, AM will be
detected .
The K500
As received from the f act
o ry, o ne sa m p le K500
showed the following algorithm
read o u ts:1 9 .60 0­
60 .555 , 1 35.100-1 76 .055,
a nd 371.6875-576.47 5 MHz.
The ac tua l exte nde d ranges
whic h wo uld break sq uelch
as f act or y ad justed w ere:
19.600-570, 137.60-176.055,
a nd 388.1875-513.025 MHz.
These ranges m ay be improved
by the sa me type of
alignment p rocedure as
o utlined fo r the Kl00.
Con clusio n
It must be po inted out
that these are experime nt al
m o d ifi c at ions ' o n ly and
worked with the pa rticu lar
sam ples of Regen cy scanners
ava ila ble at th e time
the improvem ents w ere attem
pted. I can assum e no
respo nsib ility for the projec
ts of readers nor for
d amage whic h may resul t
to circuitry!
It wo uld be a good idea
to obtain a factory service
m anual to ve rify the proced
u res o ut li ned abov e,
a nd for ideas regar din g additio
na l modificat ions lat-,
er.
The exp eriment al proc e­
d ures suggested in th is a rticle
will allow a listener
s ligh tl y mor e re cepti on
flexibility t ha n ori ginally
possible w it h the facto ry
issued sc an ner s. If any
reade rs co me up with add i­
tional field modifica tion s
(such as an S-meter ci rcu it
operated fro m the aud io
sque lch bu s), Iwould like to
hear abou t them! .
74 73 Mag azine. Octo ber , 1980