Plymouth Gran Fury1976 Operator's Manual page 32

RADIOS
An under standing of some of th e conditions that affect a properly
operatin g radio may save yo u inconvenience and concern whe n
certain recept ion prob lems are encountered.
AM Reception
Fading ~ Fading is due to a significant decrease in signal st rength
under overpasses. on d is tant stations. a nd beh ind tall bu ildings in
downtown areas.
Static - Static may be expe rienced unde r weak sig nal of off sta tion
conditio ns a nd is hea rd as a "crackling" or "popping" no ise in the
radi o speaker. This is due to electrical disturban ces. s uc h as eng in e
ignition. powe r lines. neon signs, thunderstorm s, etc.
Night time " whistles" and loss of station - AM rad io waves trave l
seve ral hundred miles further at night than during the day permit-
ting you to listen to distant clear c hann el stations. However, these
same waves also cause other t han clea r channel s tatio ns to compete
for the same channe l on your mdio dial resulting in whistles and
blocking of ot her stations.
Crosstalk - T his is the reception of more than one stalion
at
a time.
It is usua ll y encounte red when driving near radio transm itting
towe rs.
FM Reception
FM Flutter - F lu tter can best be described as repea ted pops and
hiss ing in the s peaker that interrupt ot he rwi se good recept ion. This
co nd itio n us ually ind ica tes you a rc travelling in the fr inge o r weak
area of a stati o ns signa l. However, it ca n also ex ist whe n any large
st ru cture. s uch as a building. comes between yo ur ca r and the
tran smitting tower of a sta tio n.
Cancellation - Ca ncellation is the res ult of reflected rad io waves
ca ncelling the no rmal unrefle cted signal. T hi s is simila r to rippl es in
water runn ing into each othe r and caus ing ca lm spots. Cancell at ion
mo st ofte n occurs in metropolitan a reas, but can also be present in
hilly terrain o r o n de pressed roadways. The noises are similar to
those caused by F lutter.
FM Ca pture - Capture usually occ urs whe n yo u are tu ned to a weak
station and pass near th e towe r ofa stron ge r signal. T he radio may
sw itc h between stat ions and the signa l becomes mixed o r di storted.
If you have an FM rece ive r yo u will expe rience several impo rtant
differences in the receptio n of AM and FM signals. FM can be
received up to approx imate ly 25 mi les from the stat ion , as you
reach the limi ts of a sta t ions signal the vo lume remains consta nt but
inte rfe rence noi se increases. F M and FM Stereo give a more
faithful reproduction of sO llnd and reject static from power lines,
traffic lights. thunde rstorm s a nd 0'
:ler
elec trica l sources.
Tips For Obtaining Best Reception
A lways fi ne tune yo ur rad io with the co ntro l knob afte r using a
push bU lL on. Even a slight adju stm ent ca n e liminate unn ecessary
noise or d istortion.
Turning the tone con lrollo a ll ow more bass tones will often redu ce
di stortion.
FM in the automobi le is no l entirely stat ic free. If so me stations are
always noisy whe n driv ing in ce rt a in a reas. then the noise must be 31