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World Radio TV Handbook 2007 is coming.
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http://www.hard-core-dx.com/redirect2.php?id=wrth2007
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THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed
and/or modified under the conditions set down in the Design Science License
published by Michael Stutz at http://dsl.org/copyleft/dsl.txt
Today's Topics:
1. DX Listening Digest 7-126; WOR 1378 (Glenn Hauser)
2. KRE spurs 60 kHz away (Wolfgang Bueschel)
3. Log (Chuckie)
4. 20 October 2007 Loggings (Dave Valko)
5. Tips from Milan (Giampiero Bernardini)
6. RTD DJIBOUTI (francesco)
7. Mayak signature (Al Quaglieri)
8. New logs !! (Zacharias Liangas )
9. HCDX logs between 2007-10-20 0000 UTC and 2007-10-21 0000 UTC
(Risto Kotalampi)
10. Re: Dxers Unlimited's weekend edition for 20 -21 October 2007
(Prof. Arnaldo Coro Antich)
----------------------------------------------------------------------
Message: 1
Date: Fri, 19 Oct 2007 22:50:44 -0700 (PDT)
From: Glenn Hauser <[EMAIL PROTECTED]>
Subject: [HCDX] DX Listening Digest 7-126; WOR 1378
To: Glenn Hauser <[EMAIL PROTECTED]>
Cc: [EMAIL PROTECTED]
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=iso-8859-1
DX Listening Digest 7-126 has now been posted at
http://www.w4uvh.net/dxlatest.txt or http://dxld.worldofradio.org
and now also without delay at http://www.w4uvh.net/dxld7126.txt
CONTENTS:
WOR 1378 / ALBANIA / ANTARCTICA / ARGENTINA / BELARUS / BHUTAN / BOLIVIA /
BRAZIL / BULGARIA B07 / CAMBODIA / CANADA +non RCI / CANADA CKXR / CHINA /
CONGO DR non / CROATIA / CUBA non / FINLAND / GALICIA +non / GREECE B07 /
HAWAII / INDIA / INDONESIA / ITALY / JAPAN +non / KOREA NORTH non / KURDISTAN
+non / LIBYA B07 / MICRONESIA / MYANMAR / NETHERLANDS non DRM+ / NEW ZEALAND
+non / PAKISTAN / PAPUA NEW GUINEA / PERU / RUSSIA / SAINT HELENA / TAIWAN non
B07 / UK BBCWS/BBCR4 / USA Marti / USA WRMI / USA WWV / USA WWRB / USA non WYFR
B07 / USA +non WRC / USA WIRL / USA KHIT / USA WJCC / USA WMCU / USA FCC /
VENEZUELA non / VIETNAM / VIRGIN ISLANDS US / UNIDENTIFIED 530 / UNIDENTIFIED
1610 / UNIDENTIFIED 5954 / UNIDENTIFIED 14130 / TESTIMONIALS / PUBLICATIONS /
LANGUAGE LESSONS / WORLD OF HOROLOGY / RADIO EQUIPMENT FORUM / DIGITAL
BROADCASTING / COMMENTARY / SHORTWAVE MUSIC / PROPAGATION
For restrixions and searchable 2007 contents archive see
http://www.worldofradio.com/dxldmid.html
NOTE: If you are a regular reader of DXLD, and a source of DX news but
have not been sending it directly to us, please consider yourself
obligated to do so. Thanks, Glenn
NEXT SHORTWAVE AIRINGS OF WORLD OF RADIO 1378
Sat 0800 WRMI 9955
Sat 1630 WWCR3 12160
Sat 2130 WRMI 9955
Sun 0230 WWCR3 5070
Sun 0630 WWCR1 3215
Sun 0800 WRMI 9955
Sun 1515 WRMI 7385 [ex-1500]
Mon 0300 WBCQ 9330-CLSB [confirmed Oct 15]
Mon 0415 WBCQ 7415 [time varies to 0500]s
Mon 0830 WRMI 9955
Tue 1030 WRMI 9955
Tue 1530 WRMI 7385
Wed 0730 WRMI 9955
Wed 2300 WBCQ 18910-CLSB
WORLD OF RADIO, CONTINENT OF MEDIA, MUNDO RADIAL SCHEDULE:
Latest edition of this schedule version, including AM, FM, satellite
and webcasts with hotlinks to station sites and audio, is at:
http://www.worldofradio.com/radioskd.html
For updates see our Anomaly Alert page:
http://www.worldofradio.com/anomaly.html
WRN ON DEMAND:
http://new.wrn.org/listeners/stations/station.php?StationID=24
WORLD OF RADIO PODCASTS VIA WRN NOW AVAILABLE:
http://www.wrn.org/listeners/stations/podcast.php
OUR ONDEMAND AUDIO [also CONTINENT OF MEDIA, MUNDO RADIAL]
http://www.worldofradio.com/audiomid.html
or http://wor.worldofradio.org
Regards, Glenn Hauser
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
------------------------------
Message: 2
Date: Sat, 20 Oct 2007 09:34:28 +0200
From: "Wolfgang Bueschel" <[EMAIL PROTECTED]>
Subject: [HCDX] KRE spurs 60 kHz away
To: "DXLD" <[EMAIL PROTECTED]>, "HCDX"
<[email protected]>, "egroups_harmonics"
<[EMAIL PROTECTED]>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; format=flowed; charset="Windows-1252";
reply-type=original
KOREA D.P.R. 15245.05 Voice of Korea produces again spur signals 60 kHz
away symmetrically, as happened in 2006 year also. Noted at 0705 UT with
Russian service in progress, S=6 signals on 15185.13 and 15304.90, but
wandering downwards. 0700-0900 Ru, 0900-1000 UT Korean.
At same time strong signals from FE and China, i.e. NHK Yamata 15195 S=8-9
signal.
(wb, Oct 20)
------------------------------
Message: 3
Date: Sat, 20 Oct 2007 11:25:22 +0100
From: "Chuckie" <[EMAIL PROTECTED]>
Subject: [HCDX] Log
To: <[EMAIL PROTECTED]>, "Robert Wilkner" <[EMAIL PROTECTED]>, "Logs
DSWCI Logs DSWCI Logs DSWCI" <[EMAIL PROTECTED]>,
"Ivan_Lebedevsky"
<[EMAIL PROTECTED]>, <[email protected]>,
<[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>,
<[EMAIL PROTECTED]>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="iso-8859-1"
Bolivia, 4699.35, Radio San Miguel, 1020-1040 Male in Spanish comments.
At 1026, music presented. Signal was just above the noise at a poor level
and was practically gone by 1036. (Chuck Bolland, October 20,2007)
Peru, 4774.97, Radio Tarmac, 1037-1045 Huaynos music heard at tune-in.
At 1039 a male in Spanish comments, possibly canned promos and ID.
That CODAR(?) is right on top of this freq pulsating against my ear drums.
Back to music at 1040. Signal was poor. (Chuck Bolland, October 20, 2007)
China, 6150, Firedrake, 1054-1100 Noted Firedrake jammer here which
is blocking even University Network. I have Taiwan listed here in my database
between 0900-1400 in Mandarin, so Firedrake must be after that? Not sure
how current RTI's listing is? Usually University Network blocks this freq
with their signal, so I don't hear much here. Signal of Firedrake was good and
strong
blocking everyone else. It was gone after the hour. (Chuck Bolland, October
20, 2007)
Peru, 9720, Radio Victoria, 1059-1120 Noted a woman in comments for a
brief time at 1059. After the hour male in comments over music. At
1103 canned promos and program notes presented. Something like a
political speech heard from male at 1107. Signal was fair this morning.
(Chuck Bolland, October 20, 2007)
Romania, 9515, Radio Romania International, (PRES)1110-1130+ Noted a program
of features and
comments in the German Language from a male and female. Music filler between
topics.
Many mentions of "Romania" and "Buchuresti". All of my hardcopy references
lists this
transmission between 1200 to 1300 UTC and none mention this freq. Signal was
fair.
(Chuck Bolland, October 20, 2007)
Clewiston, Florida
NRD535D
------------------------------
Message: 4
Date: Sat, 20 Oct 2007 08:55:22 -0400
From: "Dave Valko" <[EMAIL PROTECTED]>
Subject: [HCDX] 20 October 2007 Loggings
To: <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>,
<[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>,
<[email protected]>, <[EMAIL PROTECTED]>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Good LA reception this morning, no doubt due to the current active
geomagnetic conditions from the coronal hole stream. Also, Asians better
than the Pacific. (20 Oct.)
PERU 4826.46 R. Sicuani 1012 Nonstop tlk by M and W in what sounded
like a mix of SP and Indian lang. Ment of radio, informativa, estudios,
Peru, campesina, 'Peru Andina'. 1017 campesino mx began w/anncrs still
tlking over. In nx-like pgm after 1031 w/same M anncr and several
actualities. Campesino mx at 1044, and clear simple "R. Sicuani" ID
followed immediately by promo. Fading by this time. Decent signal
w/horrible CODAR QRM. Drifted up 40 hz. (20 Oct.)
PERU 5039.2 R. Libertad *1025:50 Was listening to the OC off and on
for abt 4 minutes, then began pgm w/melancholy male choral dirge. 1028
beautiful canned opening ID anmnt by M over haunting mx, then canned anmnt
w/slight echo by M w/ment of "Cusco, Cerro, Cusco", Peru, and San
Martin. 1030 M w/shouting anmnt w/ment of nacional, and into nice Huayno
mx. This is one of the toughest 'regular' LAs here. Very nice signal
though this morning and not logged since Oct. 1996. (20 Oct.)
PERU 4774.96 R. Tarma 1048 pleasant LA male choral song. 1050 M anncr
w/rapid-fire anmnts over mx. Ment of melodia and Peru. Lively LA Tropical
Pops. Canned ID/promo at 1057 then live M anncr briefly and cont. mx, and
canned echo anmnt w/ment of Peru. Voice lvl abt the same as mx lvl made
anmnts hard to copy. Fading very fast towards ToH. (20 Oct.)
PERU 9720.03 R. Victoria 1108 M w/impassioned preaching, and
audience. Good signal and just barely got //6019.51 which was heaily QRMed
of course. (20 Oct.0
MALYASIA 7270 Wai FM (pres.) 1137-1149 Long tlk by W in vern. lang
w/brief period of indigenous vcl by W. 1149 W anncr w/clear ment of
'radio'. Into middle-east-like mx 1150-1154, then M anncr w/rapid
vern. tlk w/ment of Indonesia and Malaysia (nx??). 1200 deadair, W anncr
briefly (ID??), deadair, then weak mx. Was hoping they'd have streaming
audio on their Web site for a // but they don't. Good signal and
better than 7295. Some Ham QRM. (20 Oct.)
BANGLADESH?? 7250 Bangladesh Betar?? 1231-1247+ really strong signal
and extremely weak mx at t/in. Don't know if the mx was being modulated by
the same signal or if it was something underneath. Awful Ham QRM from
7251. (20 Oct.)
73 Dave
------------------------------
Message: 5
Date: Sat, 20 Oct 2007 14:49:03 +0200
From: "Giampiero Bernardini" <[EMAIL PROTECTED]>
Subject: [HCDX] Tips from Milan
To: "CUMBRE-DX" <[EMAIL PROTECTED]>, "Hard-Core-Dx"
<[email protected]>, "Anker Petersen"
<[EMAIL PROTECTED]>, "DXLD" <[EMAIL PROTECTED]>
Message-ID:
<[EMAIL PROTECTED]>
Content-Type: text/plain; charset="iso-8859-1"
>From Milan:
4699,37 19/10 2301 Radio San Miguel, Bolivia, talks, poor
4746,9 19/10 2254 Radio Huanta 2000, Peru, songs, poor
4845,25 20/10 0145 Radio Cultura, Manaus, Brazil, songs, good
9575 19/10 2330 Medi 1, Morocco, songs, good
9875 19/10 2340 Radio Kuwait, songs AA, good
9630 19/10 2337 CNR1 Chinese invasion !
//9455-9500-9645-9650-9660-9830-9845-9875 -4800
9985 19/10 2354 WWCR Nashville, USA, EE,id, end of BC on this freq at 2359,
good
11815 19/10 2315 Radio Brasil Central, songs and jingles, fair
12020 19/10 2325 HCJB, Ecuador, songs, talks PP fair
rx SDR-IQ
ant T2FD 15 m long
ciao
Giampiero
Giampiero Bernardini
Milano
------------------------------
Message: 6
Date: Sat, 20 Oct 2007 17:56:46 +0200
From: "francesco" <[EMAIL PROTECTED]>
Subject: [HCDX] RTD DJIBOUTI
To: <[email protected]>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="iso-8859-1"
RTD DJIBOUTI
4780 21.00 RTD DIJBOUTI arabic l. id news good signal. (19-10-2007)
Audioclip available at
http://swli05639fr.blogspot.com/
73's Francesco
------------------------------
Message: 7
Date: Sat, 20 Oct 2007 12:29:55 -0400
From: "Al Quaglieri" <[EMAIL PROTECTED]>
Subject: [HCDX] Mayak signature
To: [EMAIL PROTECTED]
Message-ID:
<[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1
Radio Mayak has found a cool way to integrate its historic interval signal
into its new ID. I've posted an mp3 at:
http://www.alcue.com/mayak2007.mp3
I'll leave it up and active for a few weeks.
Cheers from a gray and gloomy (and unseasonably warm) Albany,
Al Q.
------------------------------
Message: 8
Date: Sat, 20 Oct 2007 21:14:37 +0300
From: "Zacharias Liangas " <[EMAIL PROTECTED]>
Subject: [HCDX] New logs !!
To: <>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=US-ASCII
http://zlgr.multiply.com/journal/item/100/LOGS_1920_Oct_
1520 : 0405 posibly siggnals from Brazil with marginal carrier level .
cant get except carrier
Liangas 19-10-7
USA 9450 EWTN/WEWN 2157 with IS Off at 2159* 34323 Liangas 19-
10-7 Thessaloniki GReece
N ZEALAND 9615 RNZI with old songs 'i have to go' and 'i just called'
then a series with classical or operas ID at 0619 with an old play . NIce
signal at S& 35424 with deep fades - First time listening them with so
'strong' signal Liangas 20-10-7 Thessaloniki GReece
S ARABIA 9675 SABC 0701 with ID , arab song and new ID S5 334x2
Liangas 20-10-7 Thessaloniki GReece
?? 9825 unIDed arab sattion with mainly arab songs, dull and under
modulated S5 34443 Liangas 20-10-7 Thessaloniki GReece
unIDed 17490 VoA? 0704 with lang seems to Hausa , mentioning
BUsh . QRMing CRI Liangas 20-10-7 Thessaloniki GReece
[LIBERIA] 13760 Star radio 0711 with hilife songs then talks . QRMed .
S9 to S10 , 43434 Liangas 20-10-7Thessaloniki GReece
LATVIA 9290 EMR 0800 -0815 heard somewhere in the city with
PL200 tecsun and old songs . 45544 Liangas 20-10-7 Thessaloniki
GReece
MOLDAVIA 11530 denge Mezopotamia 0959 turkish pop songs
passing the 10 o clock . Good modulation S10 45544 Liangas 20-10-7
Thessaloniki GReece
JAPAN 9750 R ajpan a heard as early as 1018 for SAturday Liangas
20-10-7 Thessaloniki GReece
UAE 11675 SOlh 1023 with bolywood songs posislby with the same
singer in series. 1035 man in dari , with posisble IS , then with afghan
songs. Liangas 20-10-7 Thessaloniki GReece
GUAM 15200 KTWR 1042 in indonesian , spiritual songs ,ending the
program 'wanita pengharapan' adn thanking people for listening them
S8 max 34333 Liangas 20-10-7 Thessaloniki GReece
PHILIPINES 12095 FEBC 1117 Hmong service S5 34232 . LOcal
noise level is now S2 Liangas 20-10-7 Thessaloniki GReece
TAJIKISTAN? 7245 1419 with turkic songs 1420 posibly talks by YL
in russian . Best in SSB vw\th very low passband filter, mixed with a CC
station , plus.... 32xx2 around S7 Liangas 20-10-7 Thessaloniki
GReece
USA 12160 WWCR3 1428 man with religious talks S3 to 5 24232
Liangas 20-10-7 Thessaloniki GReece
BLR 6255 R racya 1540 with news by YL in russian. 1542 with a song
. 1545 with more news refere nce to Alex Lukashenko A song and
back to talks . 1605 with ID and a hip hop song. Liangas 20-10-7
GABON 9580 R Africa NO1 1629 with pop and hilife songs . MAn with
short talks in between songs. S9 43343
Liangas 20-10-7
GABON 4777 RTV Gabonaise 1647 hiife song , 1750 talks by man in
seemingly french , very low modulation to catch more . S9 , 34331
,QRm by Djibuti on 4780 anda a carrier on LSB Liangas 20-10-7
http://zlgr.multiply.com (raidio monitoring site plus audio clips )
http://www.worldisround.com/articles/302315/ (Litohoro) 321199/Tinos
http://www.flickr.com/photos/zachgr pictures upload
.
on my main : www.geocities.com/zliangas
-tty-px.html : test of various TTY programs
-ethics.htm : greek ethics , days and institutions
-frape.htm: the greek way of cofee !!!
Zacharias Liangas , Thessaloniki Greece
greekdx @ otenet dot gr ---
Pesawat penerima: ICOM R75 , Lowe HF150 , Degen 1102,1103,108,
Tecsun PL200/550, Chibo c300/c979, Yupi 7000
Antenna: 16m hor, 2x16 m V invert, 1m australian loop
------------------------------
Message: 9
Date: Sat, 20 Oct 2007 23:05:02 +0000
From: Risto Kotalampi <[EMAIL PROTECTED]>
Subject: [HCDX] HCDX logs between 2007-10-20 0000 UTC and 2007-10-21
0000 UTC
To: [email protected]
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=us-ascii
Hard-Core-DX.com logs from 2007-10-20 0000 UTC to 2007-10-21 0000 UTC
---------------------------------------------------------------------
Please visit http://log.hard-core-dx.com/ for the real time logs
and to submit your logs to the HCDX Online Log.
For more information please email [EMAIL PROTECTED]
-----------------------------------------------------
------------------------------
Message: 10
Date: Sat, 20 Oct 2007 20:49:20 -0400
From: "Prof. Arnaldo Coro Antich" <[EMAIL PROTECTED]>
Subject: Re: [HCDX] Dxers Unlimited's weekend edition for 20 -21
October 2007
To: [EMAIL PROTECTED], [email protected],
[EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED]
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Radio Havana Cuba
Dxers Unlimited
Dxers Unlimited's weekend edition for 20-21 October 2007
By Arnie Coro
radio amateur CO2KK
Hi amigos radioaficionados around the world and orbiting the Earth. This
is the weekend edition of your favorite radio hobby program, the one and
only covering all , each and every aspect, of our wonderful hobby....
from short wave listening as you are doing right now, to exploring the
deep far space with a homebrew radiotelescope... from giving the
finishing touches to a new receiver assembled from one the excellent
kits available, to experimenting with a new antenna concept like the
spiral loaded dipoles that are now becoming quite popular among radio
amateurs that live in very tight quarters... Si amigos, yes my
friends... there are more than 81 ways in my list, 81 plus ways of
enjoying our wonderful hobby : RADIO... And here is now a nice
example... as quartz crystal manufacturing techniques have developed at
a fast pace during the past decade, the cost of crystals cut for some
specific frequencies used by the computer industry has gone down
dramatically... so now, it is not too difficult to assemble your own
quartz crystal bandpass filter, an essential component of any receiver
or transceiver that is going to be used for serious amateur radio work.
Recently I learned about the availability of certain specific
frequencies , that are particulary good for homebrewing the bandpass
crystal filters, that can be designed to provide the bandwidth required
for operating on different transmission modes. So now not only the once
popular color burst frequency crystals of 3579 and 4433 kiloHertz used
by the NTSC and PAL color TV systems are available to the
experimenter... the new computer clock frequencies crystals are more
plentiful and cheaper...
But there is still another use for those computer crystals, and that is
using them to provide the injection frequency for front end converters
used ahead of regenerative receivers, turning them into a type of radio
known as a REGENERODYNE...
More about the low cost computer crystals and how they can be used for
making filters and front end converters crystal oscillators in a few
seconds, after a short break for our station ID.
I am Arnie Coro, radio amateur CO2KK and as always it is my pleasure to
share with you about seventeen to eighteen minutes of on the air, on the
web and on the Hispasat satellite tiem amigos... stay tuned..
........
This is Radio Havana Cuba, the name of the show is Dxers Unlimited and
yes, we do QSL, we do verify reception reports with a nice QSL card....
send your signal reports and comments about our programs to
[EMAIL PROTECTED], or VIA AIR MAIL to Arnie Coro , Radio Havana Cuba, Havana,
Cuba.
Low cost mass produced computer quartz crystals are making possible that
radio experimenters homebrew some really excellent crystal filters. A
recent example was brought to my attention my amigo Colbert , who lives
near London's Gatwick International Airport. He sent me the circuit
diagrams of several crystal ladder type filters that he has experimented
with. The simplest one of them all used three 6000 kiloHertz crystals
that he carefully matched using a friends digital frequency meter.
Colbert explains in his e-mail that
he obtained information about ladder type crystals filters from several
different sources, and decided to experiment with them. He has done a
lot of experiments, and one of the most interesting ones is a variable
bandwidth ladder filter that he will be using in a new project, an
amateur radio transceiver for the 20 meters band that he is now
planning. Colbert has built a six crystals ladder filter that according
to him works exactly as it should... He says in his e-mail : Arnie, the
professional engineering literature calls those ladder filters by the
name of " Assymetrical lower sideband ladder crystal ladder filter" and
I fully agree with the authors of the paper , because when the six
crystals filters was tested with professional laboratory equipment, the
shape of the frequency response curve as assymetrical and favoring the
lower sideband, exactly as the authors of the research paper had stated
. The most important thing about these filters is that those computer
crystals are becoming cheaper and cheaper, so if you do have a lot of
patience, the crystals can be tested and their poles and zeros of
resonance plotted... Then with that precise information at hand the
design of ladder filters is not too difficult. Well amigos, as you have
realized, Colbert has gained a lot of experience about crystal ladder
filters and his results are very consistent...
A high quality bandpass crystal filter can be bought , but they are not
cheap, and besides that, if you homebrew your own filter, you learn a
lot more about radio and electronics, and that's part of the enjoyment
of the hobby too...
.......
ASK ARNIE, si amigos, ASK ARNIE, is the most popular section of Dxers
Unlimited... it is la numero uno, the number one favorite of our
worldwide audience, because as listener Gary from Florida in the USA
writes, by listening to or reading the scripts of Dxers Unlimited, you
can learn a lot of interesting things about radio... Today's question
also came from Florida, listener Stewart from Clearwater wants to know
what should the frequency response of a bandpass filter should be so
that the best possible quality AM broadcast band reception is achieved.
Well amigo Stew, this is a tough question, a difficult one indeed,
because one needs to understand that AM broadcast stations transmit on
10 or 9 kilohertz bandwith channels, depending on what part of the
world they are located... That means that at either side of the
carrier, the audio bandwidth is limited to 5 or 4.5 kiloHertz, depending
on the part of the world where you are located. According to highly
qualified engineers, the ideal AM broadcast band receiver filter for
listening in the Americas, that is ITU Region II should have
a bandwidth of SIX KILOHERTZ.... and a very abrupt shape factor
between the minus six dB and the minus sixty dB points of the filter's
response curve. Listening trough such a six kiloHertz bandwidth filter
will make it mandatory to tune the station so that the minus 6 dB point
of the response curve falls about 500 Hertz to one side of the
carrier,and then your radio will be picking up the full carrier plus one
of the sidebands, something that is very good, because you won't have
any distortion caused by selective fading. Your sharp cutoff filter will
cancel one of the sidebands, and because an AM signal transmits two
identical sidebands, your receiver will produce a high quality audio.
So amigo Stew, again, look for a SIX kiloHertz bandwidth filter if you
want to listen to AM broadcast band stations with good quality and
without the bad effects of selective fading distortion. But, if you
want to hunt for real DX on the AM band or for that matter in the
Long Wave AM band , then my advice is to add a second filter to your
receiver, that will provide you with a 2.4 or 2.7 kiloHertz
bandwidth... Such a narrow filter is used by practically all Dxers
involved in AM broadcast band activities for a very good reason, and
that is the fact that it can dramatically reduce the adjacent channel
interference that many times makes it impossible to obtain a clear
ID of a DX station whose operating frequency is right next to a local or
semi local station...
AM broadcast band and Long Wave broadcast band DXing are two of the
favorite ways of enjoying our wonderful hobby amigos, and you can log
many DX stations using low cost receivers too... But, as expected,
better radios will bring in many more DX stations , of course !
......
And now let's move to our next item of today's weekend edition of Dxers
Unlimited... getting ready for the upcoming ham radio contest season...
Radio amateur operators around the world are now getting ready for what
is going to be a really challenging contest season. The extremely low
solar activity will make contest operations really difficult, and long
standing contest teams are looking for special advice from HF
propagation experts in order to optimize their operations so as to make
as many contacts as possible under the expected very poor band
conditions. As one of our local contest enthusiasts told me last week,
the time windows to areas of the world with high participation are going
to be of very duration, so in order to have good chances to place among
the first in any contest, very accurate propagation forecasts are
essential in order to make the best possible use of the very short time
windows that are expected during the next several months due to the
extremely low solar activity...
Having a propagation guru at hand during the contest will certainly make
a lot of difference amigos !!!
And talking about HF propagation, having access to the on line data of
the world's network of ionospheric vertical incidence sounders will make
possible to produce very accurate short term forecasts, the ones that
are required by contest operators.
......
This is the weekend edition of Dxers Unlimited and now our next item...
a quick visit to Arnie's workshop... share with me a couple of minutes
testing my new assymetric pulses battery charger that has
already revived several nickel cadmium rechargeable batteries that I had
thought could not be recharged any longer. Apparently the assymetric
pulses produced by the new battery charger design removes bad areas of
the plates and brings the cell back to its full
capacity. The circuit is not very complicated, but of course that it
is not as simple as the typical constant current charger built around
an integrated circuit voltage regulator device....Batteries continue to
be a weak spot of the radio and electronics industry, and although many
new concepts are now in the experimental stages, like is the case of the
newer versions of the lithium based batteries , there is still need for
more basic and applied research to be done in order to
increase the overall efficiency of these sources of electricity
essential for the operation of so many of today's electronic equipment.
And now amigos , as always at the end of the program, here is
Arnie Coro's Dxers Unlimited's HF plus low band VHF 30 to 60 megaHertz
propagation update and forecast... Solar activity has stayed at
extremely low levels with the solar flux not even reaching 70 units,
while the optical sunspot count has been just one zero after the other.
On Thursday the Planetary A index showed a marked increase ...
End of Hard-Core-DX Digest, Vol 58, Issue 23
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