Evening star., 1924-10-16
RADIO QUERIES


trict perhaps you will allow me to in
form your readers where some Of the
| code interference" comes from.
The Navy Is obligated to send out
time and weather to ships at sea on an
audible frequency. The Navy Is not
much interested In modulated transmits
! sion for its own use. as continuous
| superior. However. there are many
Shipping Board and commercial stations
which cannot receive c. w, and "modu-
lated" is therefore imposed on us.
During the Summer. while the Airing
| ton tune set was being modified. the
time was sent out on the navy yard tube
set, designed for c. W. This set used
rectified 50o-cycle current and by cut
ting out the filter. transmitted c. W.
with 5o0-cycle modulation. The har-
monies, which had not previously both
cred the broadcast listeners. then be-
came audible. AS soon as the material
could be put together. the set was
screened and the harmonics reduced, but
not eliminated.
Time and weather are now sent out
by Arlington at about 25-ampere radia-
ton in the large antenna, which is the
same radiation as previously used at
NAA. and also this Summer at NAL.
the navy yard station. This is about
3-K.W. output.
NV house is about I mile from WRC
and WCAP and ) from the yard.
listen on a neutrodyne, with an antcnnA
on the roof, and find that these sta
tions completely block off my recep-
ton between about 430 to 500 meters,
and there is a very prominent harmonic
somewhere around 255 meters. OF
course, loop reception would improve
| my conditions il l wished to use it.
| The Navy output on time and weather
| is probably about six times that OF the.
| local stations. and set which would
| be quite good enough as far as har-
monies was concerned on 500 watts
| would not fill the bill We are trying
| to completely eliminate all interference,
| and think that in the last few days
| very noticeable advance has been made.
| IL this is noticeable to your readers,
perhaps they will write you about 1t.
| All the code 'interference" does not
| come from NAA or NAL. frequently
| copy these messages for check, and
would suggest that any Of your readers
who cannot read code. but who wish TO
| identify the Navy time signal (signed
| NAA, whether sent out from Arlington
| or the navy yard). tune in from 800 to
| 10 pm and note the settings. Any SUD-
| seouent interference on some other SET
| tinrs will then not be confused with
NAA-
| Personally. 7 think that the people
with oscillatinE receivers are much
worse pest than MA Many a tlms
| I have had reception from kGO ana
other stations spoiled by some enthu-
| siast beating with the carrier wave
| We all want to receive all the sta
| tions but let's go $3.50 on II. we
will do our best TO eliminate mar
monies and you can let US know
| whether 1t helps you. and won't you
| chloroform) the .oscillators" ROB
ERT s. LOWELL
Radio Editor;
Monday night I received station
| in Des Moines, Iowa, broadcastinG an
| organ recital played by Mr.. Myer.
| When the station signed OF shortly
| before 1 o'clock. Eastern standard
time, it was announced as the Elec-
tric Light Co., Des Moines. Iowa Could
| you tell me the call letters and the
| distance from Washington to TINS
| station?-C. S.
| The only station in Des Moines,
| Iowa, is WHO. 1t Is operated by the
Bantes Life Insurance Co. Des MoineS
is ss5 miles from Washin gton by air
| line.
Radio Editor,
Can you tell me the location Of the
| station with the call letters Of WIZ.
| il there is such a station? Following
are the stations ! received Monday
night up to midnight. when I signed
| OF. listed as I picked them up: WCAP,
WTAM, WGY, WMAF. WCBD, WTAS
| WDAR, WGR- KDKA. WSB, WLW.
| WIZ, WOR- WHAZ. WIN. xxx,
| WNAC, WEAN and WBZ.
| I received these stations on a one
tube regenerative set, and 1 am going
| to get the Pacific Coast before setting
| aside this set. Can some Of the fans
| do any better?-RADIO MIKE.
Have no record of a station with
the call letters WIZ. Your DIX rec
ord will give the fans something to
| shoot at.
| Radio Editor:
] would like to know what station
was broadcasting a concert by the
Victorian Orchestra Saturday night.
1t sounded like the announcer said
| Ames, Iowa--CARL ULRICH.
The only station in Ames. Iowa, Is
WOI. 1t is owned and operated by
the Iowa State College, electrical en-
gineering department..