Date   

Re: What is DX !! Is it RF power or distance that make for a DX signal.

Michael Evans - Mike MBR <michaelrae65@...>
 

As per the title what makes for DX. Mike MBE.

--- In ultralightdx@..., "FurlX" <dmcqdx@...> wrote:

Ive been a DX'er since 1949!!

DX is listening to Long distant Radio Signals, either LW, MW, SW, or VHF and UHF.

Ive loged over 120 Countries and got QSLS from over a 1,000 stations on SW and 103 Countries on MW with 600 QSL's received...(including several 1st Reports from NZ)

DX is the Radio Term (Ham)for "Long Distance".

I consider in my case Stations at least 1,500 miles or more from my QTH as DX, (even 0n the "Degen DE1125" with its whip I get many European and South American Stations)

Its all down to LISTENING.


Puyallup, WA Ultralight TP's for 11-4

Gary DeBock
 

Hello All,
 
     In a pretty remarkable comeback, what had been a thoroughly mediocre band prior to 1420 suddenly came to life with a strong sunrise enhancement from 1425-1450, boosting several Asian mainland stations up to their best audio of the Fall Season.
     The listening session started of at 1300 with the TP "big guns" at their usual anemic level, struggling to produce much audio through the noise and domestic splatter. Unusually, there was no mid-session propagation dive or boost, and the same collection of Asian regulars (594, 648, 657, 738, 747, 774, 972, 1134, 1566 and 1575) were still fading in and out with lackluster signals right up until 1420. It appeared that another mediocre late-season session was about to wrap up.
     Suddenly, 972-HLCA faded in strongly at 1430, along with a pesky Chinese co-channel. 738-BEL2 also rose up to be heard, with audio near its best of the season. 639-CNR1 and 675-Vietnam soon followed, with the latter having its strongest signal since September. Finally around 1350, the Chinese YL speech from 936-Anhui provided that station's best signal of the season. The Japanese NHK stations had a moderate signal boost during this period, but it was nothing like the weird propagation surge from China. Unfortunately it was necessary to wrap things up around 1455 when the Chinese were still strong, so there was no chance to check the other notable Mainland frequencies like 756, 927, 945, 981, 1035, 1377 and 1593. Maybe one of the SDR DXers also noticed the late-session China surge from 1430-1445, when reviewing recordings from that period this morning?
 
     The following were heard on a C.Crane SWP Slider model (7.5" loopstick) and stock Tecsun PL-606 DSP model, inductively coupled to a 9' sided PVC tuned passive loop (in the back yard). A modified ICF-2010 (30" loopstick) was used as an SSB spotting receiver:
 
558  HLQH  Daegu, S. Korea  Fair-good with music at 1423, // 603
594  JOAK  Tokyo, Japan   Very good with Japanese interview 1444
603  HLSA  Namyang, S. Korea  Good with Korean music at 1424
639  CNR1  China Synchros  Fair with male-female Chinese speech
         at 1445 during sunrise enhancement; inaudible previously 
648  VOR   Razdolnoye, Russia  Good strength Russian music during
         Japanese external program at 1419  http://www.mediafire.com/?agcrhiec28xv94k
657  Pyongyang BS, N. Korea  Fair mumbling Korean tirades at 1418
675  VOV  Hanoi, Vietnam  Fair Vietnamese YL speech during sunrise
         enhancement; best signal since Sept. http://www.mediafire.com/?95600b5t6yqsdu5 
738  BEL2  Penghu, Taiwan  Another Chinese station boosted up by
         late session surge around 1446  http://www.mediafire.com/?ygc4ur2afvrd9k0
747  JOIB  Sapporo, Japan  Good Japanese talk around 1448
774  JOUB  Akita, Japan  Losing battle with KTTH splatter at 1415
828  JOBB  Osaka, Japan Fair-good Japanese speech around 1350
936  Anhui, China  YL speech boosted by late surge at 1450; best 
         audio of season (recorded on new PL-606)  http://www.mediafire.com/?1inc1x8orhma9qn
972  HLCA  Dangjin, S. Korea  Good Korean speech with CC 
         co-channel at 1431 http://www.mediafire.com/?j4o84or486nyxpb
1134  KBS3  Hwaseong, S. Korea  Good with Korean speech at 1439
         during late-session surge
1566  HLAZ  Jeju, S. Korea  Fair-good Japanese religious pgm 1341
1575  VOA  Ban Rassom, Thailand  Fair Asiatic language speech 1340
 
73 and Good DX,
Gary DeBock
 
    
                              


Re: What is DX !!

FurlX <dmcqdx@...>
 

Ive been a DX'er since 1949!!

DX is listening to Long distant Radio Signals, either LW, MW, SW, or VHF and UHF.

Ive loged over 120 Countries and got QSLS from over a 1,000 stations on SW and 103 Countries on MW with 600 QSL's received...(including several 1st Reports from NZ)

DX is the Radio Term (Ham)for "Long Distance".

I consider in my case Stations at least 1,500 miles or more from my QTH as DX, (even 0n the "Degen DE1125" with its whip I get many European and South American Stations)

Its all down to LISTENING.


Re: Tecsun PL-606 1 kHz DSP Ultralight-- More Information

Gary DeBock
 

Hi Farmerik,
 
Yes, the new PL-606's LW operation is set up exactly like that of the PL-360. The LW frequencies are added to the MW frequencies, to make one large, single band from 150-- 1610 kHz. The radio tunes in 1 kHz steps on this "mega-band" if the tuning thumb wheel is rotated slowly, and in 9 kHz steps if the thumb wheel is speeded up.
 
73, Gary 
 

In a message dated 11/4/2010 9:51:28 A.M. Pacific Daylight Time, farmerik@... writes:
 

When the PL-606 tunes LW, does it tune AM BCB with it like the PL-360? [about 150-1620 KHz. in one band with 9 KHz. steps or 1 KHz. steps]-FARMERIK

--- In ultralightdx@..., D1028Gary@... wrote:
>
> Hello All,
>
> Tecsun's newest DSP Ultralight was taken for a "test drive" during
> TP-DXing this morning here on the west coast, primarily to check out the
> compact little radio's "soft mute" level, and MP3 audio recording quality.
> Asian signals weren't exactly booming in, but there was a fair signal around
> 1420 UTC (0720 PDT) from 738-BEL2, Taiwan's 100 kw "big gun."
> The new PL-606 was inductively coupled to the 9' PVC loop (which
> brought Taiwan's signal on the PL-606 up from inaudible to fair), and 1 kHz
> frequency offset tuning was used to check the radio's "soft mute" signal drop
> off. ULR transoceanic DXers frequently use this 1 kHz offset tuning to get
> further away from domestic splatter, so long as the DX signal drop off on
> their ULR is not too severe (as in the case of the PL-380, and the CFJ455K5
> IF-filtered E100's and SWP's). In this morning's test, BEL2 was tuned in on
> its 738 kHz frequency on the PL-606 for the first 20 seconds of this MP3
> (along with a 2 kHz heterodyne and 740-KCBS splatter), while the second 21
> seconds were recorded on 737 kHz _http://www.mediafire.com/?p8kkulbnnpdhp2s_
> (http://www.mediafire.com/?p8kkulbnnpdhp2s) . Although the 1 kHz offset
> tuning did remove the heterodyne and 740 splatter, it also removed most of
> Taiwan's signal, a result similar to the PL-310's "soft mute" behavior.
> Further testing against both the PL-310 and PL-380 confirmed that the
> PL-606's soft mute behavior is very similar to that of the PL-310,
> although because the new radio's AM sensitivity is significantly superior to that
> of the PL-380, even with its greater "soft mute" drop off, the new PL-606
> can usually match the PL-380's TP-DX station signal quality when 1 kHz
> detuning is used. Surprisingly, the compact PL-606 has been matching the larger
> PL-310 in AM sensitivity on all frequencies from 530-1700 kHz.
> The lack of a direct-entry keypad on the PL-606 makes it necessary to
> rotate the thumb wheel multiple times in order to shift from the low band
> to high band, unless stations are already stored in memory. Another quirk
> (at least in my PL-606 review model) concerns accessing the LW band. In a
> PL-360-style mystery system, the PL-606 lacks any front-panel indication that
> it can even tune the LW band, nor does the current user manual tell you
> how to access the frequencies. The method is to turn off the radio, press the
> 9/10 kHz control down until "9 kHz" disappears (and the clock comes back),
> then press the "MW" control down until "LW On" disappears (and the clock
> comes back). Although that is the LW-band access procedure, in the case of
> my review model, the radio still has a quirk somewhere that is preventing LW
> reception.
> The PL-606 is noticeably smaller and lighter than either the PL-310
> or PL-380, and probably shares a lot of compact circuitry with the tiny,
> vertical-form PL-360. The new model can be reasonably pictured as a horizontal
> form PL-360 with far superior AM sensitivity, and with all the Si4734 DSP
> filtering options. That's a very effective combination of sensitivity,
> selectivity and portability on the AM band-- with a pretty low price as a bonus.
>
> 73 and Good DX,
> Gary DeBock
>
> (Photo below is also at _http://www.mediafire.com/?b2biy0s21zgo5dc_
> (http://www.mediafire.com/?b2biy0s21zgo5dc) )
>


Re: Bit OT: Why nulls improve with tilting?

Russ Edmunds <wb2bjh@...>
 

Reason 1: Most MW transmitting towers sned the signals with both vertical and horizontal components. Some have added hardware to greatly reduce the skywave component, while others have not. Therefore, the tilt is sometimes required to eliminate some of the skywave.
 
Reason 2: Building on one above, the tilt feature is useful in nulling your locals because there is almost always some localized skywave component present.
 
Reason 3: MW signals at distance are reflected in the ionosphere and sent back to earth. This introduces a vertical aspect to the received signal. Therefore a tilt feature could be used in some cases to 'stablize' a wek DX signal.
 
I see no reason why most loop antennas having the tilt feature could not be used for peaking, althouhgh the more prevalent use is in nulling.

Russ Edmunds
Blue Bell, PA ( 360' ASL )
[15 mi NNW of Philadelphia]
40:08:45N; 75:16:04W, Grid FN20id

FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'
AM: Modified Sony ICF 2010 barefoot


--- On Wed, 11/3/10, huelbe_garcia@... wrote:

From: huelbe_garcia@...
Subject: [ultralightdx] Bit OT: Why nulls improve with tilting?
To: ultralightdx@...
Date: Wednesday, November 3, 2010, 10:32 PM

 
Hello all!

Stephen posted a few hours ago a note on something I always wondered the reason: tilting the antenna does improve nulls of groundwaves. I can't think on an good explanation why this happens :) 

As all MF stations use vertical irradiators, I think no tilting would be needed to null the station completely, specially when tuning groundwaves.

But this is not the case. Most of the time, the local stations need some tilt to null it out. Only when I hear not-so-local stations (say some 20mi/30km away), tilting is not needed anymore.

Would you guys guide me why we need tilting on groudwave MF?

Thanks a lot!

Huelbe.


New stations 11/3/10

edsemrad
 

Hi everybody,

Conditions have been fair to good the past few days. I have been camped out on frequencies which could bring in new states. Nothing new yet but in the process I did record a few regional stations for the master log.
Below are my loggings:
The receiver is a Tecsun PL-380 and all station ID's are recorded on a Sony recorder. The times are CDST.

10/29/10:
930 2300 WTAD Quincy IL. "On talk radio 930 Quincy"

10/31/10:
920 0605 WBAA West Lafayette IN. "This is WBAA"

11/2/10:
710 0831 WDSM Superior WI. "This is WDSM with your election day weather"

11/3/10:
1100 1830 KDRY Alamo Heights TX. "... for DRY AM 1130"
580 1851 WTCM Traverse City MI. "Weekdays at noon on news talk WTCM"

11/4/10:
790 0433 WSGW Saginaw MI. "This is WSGW 790 AM"
1140 0645 WBXR Hazel Green AL. "WBXR"

The recent discussion about tilting and nulling was great. It works! I tried it on 790 kHz which has severe splatter from local WBBM. I tilted the PL-380 in the best null I could get and in popped WSGW Saginaw MI. Thanks guys!

Totals now are 241 stations, 33 states, 5 Canadian provinces and 4 countries.

Ed
Lake Villa, IL


Re: Bit OT: Why nulls improve with tilting?

Gary Kinsman
 

Hi Kevin,

I've long wondered about this. Thanks for the explanation.

So, if I'm understanding you correctly, the tilting of the Quantum Loop antennas can be used for nulling, but not for peaking, since they tilt only in the long dimension of the ferrite loop element.

Regards,
Gary

--- In ultralightdx@..., "dhsatyadhana" <dhsatyadhana@...> wrote:

I'll try and give it a shot. The antenna pattern is shaped like a donut, like the picture at:
http://www.fmx.dk/projects/wing_cam/119-1935_IMG.JPG

In this picture, imagine the ferrite loopstick sticking horizontally through the donut, with nulls at either end. The null zone is actually conical, meaning that you have to point the null properly in all three directions, including azimuth (elevation).

Now imagine a local pest that is coming in at, say, 45 degrees above the horizon. If you left your loopstick perfectly level, as in the picture above, signals coming from 45 degrees up will still be heard quite nicely. However, if you point it upward 45 degrees, the maximum null will also be 45 degrees up, matching the elevation of the pest's signal, and therefore the null is achieved.

For signals from far away, the angle of arrival is perhaps a few degrees at most above the horizon, and nulls are generally achieved with the loopstick essentially level, since the null of the loopstick is pointing more or less at the horizon

Hope this helps - Kevin S
Bainbridge Island, WA


9KHz. steps? - FARMERIK

Rik
 

I know there are a few LW exceptions to the 'normal' 9 KHz steps on LW, but what about TA DX on the AM BCB frequencies? I was thinking I should print off a list of 'standard' 9 KHz. spaced frequencies, but I wanted to be sure I started looking at the most likely spots. Can any DXer in the North East tell me likely TA catches which are in English, since unfortunately I do not understand any other languages. I just set up a 500 foot BOG,Unfortunately it points SE, due to site limitations. I am getting lots of signal, so I may try a NE run of wire, but it would not be even 300 feet. So the list needs to be SE of the northern CT border near 42 degrees Latitude. - FARMERIK


Re: Tecsun PL-606 1 kHz DSP Ultralight-- More Information

Rik
 

When the PL-606 tunes LW, does it tune AM BCB with it like the PL-360? [about 150-1620 KHz. in one band with 9 KHz. steps or 1 KHz. steps]-FARMERIK

--- In ultralightdx@..., D1028Gary@... wrote:

Hello All,

Tecsun's newest DSP Ultralight was taken for a "test drive" during
TP-DXing this morning here on the west coast, primarily to check out the
compact little radio's "soft mute" level, and MP3 audio recording quality.
Asian signals weren't exactly booming in, but there was a fair signal around
1420 UTC (0720 PDT) from 738-BEL2, Taiwan's 100 kw "big gun."
The new PL-606 was inductively coupled to the 9' PVC loop (which
brought Taiwan's signal on the PL-606 up from inaudible to fair), and 1 kHz
frequency offset tuning was used to check the radio's "soft mute" signal drop
off. ULR transoceanic DXers frequently use this 1 kHz offset tuning to get
further away from domestic splatter, so long as the DX signal drop off on
their ULR is not too severe (as in the case of the PL-380, and the CFJ455K5
IF-filtered E100's and SWP's). In this morning's test, BEL2 was tuned in on
its 738 kHz frequency on the PL-606 for the first 20 seconds of this MP3
(along with a 2 kHz heterodyne and 740-KCBS splatter), while the second 21
seconds were recorded on 737 kHz _http://www.mediafire.com/?p8kkulbnnpdhp2s_
(http://www.mediafire.com/?p8kkulbnnpdhp2s) . Although the 1 kHz offset
tuning did remove the heterodyne and 740 splatter, it also removed most of
Taiwan's signal, a result similar to the PL-310's "soft mute" behavior.
Further testing against both the PL-310 and PL-380 confirmed that the
PL-606's soft mute behavior is very similar to that of the PL-310,
although because the new radio's AM sensitivity is significantly superior to that
of the PL-380, even with its greater "soft mute" drop off, the new PL-606
can usually match the PL-380's TP-DX station signal quality when 1 kHz
detuning is used. Surprisingly, the compact PL-606 has been matching the larger
PL-310 in AM sensitivity on all frequencies from 530-1700 kHz.
The lack of a direct-entry keypad on the PL-606 makes it necessary to
rotate the thumb wheel multiple times in order to shift from the low band
to high band, unless stations are already stored in memory. Another quirk
(at least in my PL-606 review model) concerns accessing the LW band. In a
PL-360-style mystery system, the PL-606 lacks any front-panel indication that
it can even tune the LW band, nor does the current user manual tell you
how to access the frequencies. The method is to turn off the radio, press the
9/10 kHz control down until "9 kHz" disappears (and the clock comes back),
then press the "MW" control down until "LW On" disappears (and the clock
comes back). Although that is the LW-band access procedure, in the case of
my review model, the radio still has a quirk somewhere that is preventing LW
reception.
The PL-606 is noticeably smaller and lighter than either the PL-310
or PL-380, and probably shares a lot of compact circuitry with the tiny,
vertical-form PL-360. The new model can be reasonably pictured as a horizontal
form PL-360 with far superior AM sensitivity, and with all the Si4734 DSP
filtering options. That's a very effective combination of sensitivity,
selectivity and portability on the AM band-- with a pretty low price as a bonus.

73 and Good DX,
Gary DeBock

(Photo below is also at _http://www.mediafire.com/?b2biy0s21zgo5dc_
(http://www.mediafire.com/?b2biy0s21zgo5dc) )


Re: Oklahoma TP's 10-4-10

Gary DeBock
 

Hi Richard,
 
Sorry that no Asian signals made it to Oklahoma this morning. You may feel like throwing one of your table receivers at me, but here on the west coast there was a very strong sunrise enhancement around 1445 this morning, that brought many TP signals up to vibrant levels. Of course, there have been no TA stations to show up yet here this season, so maybe you can consider yourself lucky to be the only ULR-DXer to have received both types of transoceanic signals this Fall.
 
73, Gary
 
   
 

In a message dated 11/4/2010 7:12:37 A.M. Pacific Daylight Time, richarda@... writes:
 

I listened at 1218-1300 UTC this and didn't hear a single signal from across the Pacific. It was the first quiet morning in that direction since the first week of September. The strongest signals were coming from the south and southwest.

Looking at reports, it appears we may be in for increased solar activity during the next several days. For me that means more signals from Mexico. Earlier, usually strong WGN 720 was barely audidle after about 1000 UTC.

Richard Allen
36°22'51"N / 97°26'35"W
(near Perry OK USA)


Oklahoma TP's 10-4-10

bbwrwy
 

I listened at 1218-1300 UTC this and didn't hear a single signal from across the Pacific. It was the first quiet morning in that direction since the first week of September. The strongest signals were coming from the south and southwest.

Looking at reports, it appears we may be in for increased solar activity during the next several days. For me that means more signals from Mexico. Earlier, usually strong WGN 720 was barely audidle after about 1000 UTC.

Richard Allen
36°22'51"N / 97°26'35"W
(near Perry OK USA)


MW log with Kaito KA200

Antonios Kekalos <akekalos@...>
 

Took delivery yesterday of a very small, Kaito KA200 ($12.99 from Amazon.com) AM/FM radio. Haven't played with FM yet, but initial results on AM, while not spectacular, are consistent with several other small radios I have. The only negative comment I can make at this time is that the tuning wheel is extremely stiff making fine adjustments very difficult. Any other KA200 owners on list? Maybe you can post your results/impressions on this radio?

All times EDT; RX Kaito KA200 (barefoot), QTH Traverse City, MI

11.3.10, 2120, 1510, WLAC, Nashville TN, 50kw, 596mi/959km
11.3.10, 2125, 1540, KXEL, Waterloo IA, 50kw, 373mi/600km
11.3.10, 2129, 620, WTMJ, Milwaukee WI, 50kw/10kw, 166mi/267km
11.3.10, 2130, 650, WSM, Nashville TN, 50kw, 596mi/959km
11.3.10, 2131, 700, WLW, Cincinnati OH, 50kw, 392mi/630km
11.3.10, 2133, 760, WJR, Detroit MI, 50kw, 206mi/332km
11.3.10, 2137, 830, WCCO, Minneapolis MN, 50kw, 377mi/606km
11.3.10, 2141, 1030, WBZ, Boston MA, 50kw, 750mi/1207km
11.3.10, 2143, 1490, WKYW, Frankfort KY, 1kw, 455mi/732km
11.3.10, 2145, 1210, WPHT, Philadelphia PA, 50kw, 627mi/1009km

11.4.10, 0623, 670, WSCR, Chicago IL, 50kw, 227mi/365km
11.4.10, 0626, 720, WGN, Chicago IL, 50kw, 227mi/365km
11.4.10, 0628, 780, WBBM, Chicago IL, 50kw, 227mi/365km
11.4.10, 0630, 800, CKLW, Windsor ON, 50kw, 216mi/348km
11.4.10, 0630, 820, WCPT, Willow Springs IL, 5kw/1.5kw, 238mi/383km
11.4.10, 0635, 840, WHAS, Louisville KY, 50kw, 451mi/725km
11.4.10, 0636, 890, WLS, Chicago IL, 50kw, 227mi/365km
11.4.10, 0638, 950, WWJ, Detroit MI, 50kw, 206mi/332km
11.4.10, 0640, 1040, WHO, Des Moines IA, 50kw, 460mi/741km
11.4.10, 0648, 1100, WTAM, Cleveland OH, 50kw, 301mi/484km
11.4.10, 0649, 1140, WRVA, Richmond VA, 50kw, 654mi/1052km
11.4.10, 0650, 1190, WOWO, Fort Wayne IN, 50kw/9.8kw, 255mi/411km



--
Tony, N4RNI
Traverse City, MI
EN74dq
FISTS #14949, SKCC# 7117, NAQCC# 4774, QRP ARCI 7407, SWLR-RN072, WA8050SWL

Not every conspiracy is a theory-AMC's Rubicon




Low RF power at a fair distance.

Michael Evans - Mike MBR <michaelrae65@...>
 

Hi Guys re my low RF power posting and those PINGS, first the pings the guys has a PC programme so no waiting he just listens to the play back and has the dates thing is his logs are long and very boring as you might imagine.
Next 250mW, I had at one time a Josee kit a ready made postage size stamp MW BC TX I put it to a 270 foot long wire between two tower blocks at 20 floors high, it was powered from a 9 volt battery and as the 9 volts want down so the frequency drifted 1.352.5 1.360 anyway I lived by a railway, re rail lines and there was a metal fence that ran many yards.
I ran a live show and stupid as it was gave out a phone number, I got a call from a guy in his car at 12 miles away he said don't say where you are I am not the RI DTI GPO FCC but I am going to DFing, you {brown pants time} after a while he turned up, so where is this TX then he said over there I said on the window sill "wow" and that is what I was hearing, sure is I said and he played back a cassette tape I was impressed, all I can think is the signal was travelling around the rail lines and the fencing, those were the days, so yes 250mW can get out as long as you have height and a few railway lines and about 300 yards of fenching LOL. Mike MBR UK.


Re: Bit OT: Why nulls improve with tilting?

Kevin Schanilec
 

I'll try and give it a shot. The antenna pattern is shaped like a donut, like the picture at:
http://www.fmx.dk/projects/wing_cam/119-1935_IMG.JPG

In this picture, imagine the ferrite loopstick sticking horizontally through the donut, with nulls at either end. The null zone is actually conical, meaning that you have to point the null properly in all three directions, including azimuth (elevation).

Now imagine a local pest that is coming in at, say, 45 degrees above the horizon. If you left your loopstick perfectly level, as in the picture above, signals coming from 45 degrees up will still be heard quite nicely. However, if you point it upward 45 degrees, the maximum null will also be 45 degrees up, matching the elevation of the pest's signal, and therefore the null is achieved.

For signals from far away, the angle of arrival is perhaps a few degrees at most above the horizon, and nulls are generally achieved with the loopstick essentially level, since the null of the loopstick is pointing more or less at the horizon

Hope this helps - Kevin S
Bainbridge Island, WA

--- In ultralightdx@..., "farmerik" <farmerik@...> wrote:

I have wondered the same thing. The only thing I could think of, is that by tilting a loop antenna, you are narrowing the beam. The figure 8 pattern is as viewed from above in 2 dimensions, but it is actually a cone in each direction and by tilting, you are using a narrower section of the cone. That is just my guess. I hope some one who really knows will chime in and tell us. - FARMERIK

--- In ultralightdx@..., "huelbe_garcia@" <huelbe_garcia@> wrote:

Hello all!

Stephen posted a few hours ago a note on something I always wondered the
reason: tilting the antenna does improve nulls of groundwaves. I can't
think on an good explanation why this happens :)

As all MF stations use vertical irradiators, I think no tilting would be
needed to null the station completely, specially when tuning groundwaves.

But this is not the case. Most of the time, the local stations need some
tilt to null it out. Only when I hear not-so-local stations (say some
20mi/30km away), tilting is not needed anymore.

Would you guys guide me why we need tilting on groudwave MF?

Thanks a lot!

Huelbe.


Tecsun PL-606 1 kHz DSP Ultralight-- More Information

Gary DeBock
 

Hello All,
 
     Tecsun's newest DSP Ultralight was taken for a "test drive" during TP-DXing this morning here on the west coast, primarily to check out the compact little radio's "soft mute" level, and MP3 audio recording quality. Asian signals weren't exactly booming in, but there was a fair signal around 1420 UTC (0720 PDT) from 738-BEL2, Taiwan's 100 kw "big gun."
     The new PL-606 was inductively coupled to the 9' PVC loop (which brought Taiwan's signal on the PL-606 up from inaudible to fair), and 1 kHz frequency offset tuning was used to check the radio's "soft mute" signal drop off. ULR transoceanic DXers frequently use this 1 kHz offset tuning to get further away from domestic splatter, so long as the DX signal drop off on their ULR is not too severe (as in the case of the PL-380, and the CFJ455K5 IF-filtered E100's and SWP's). In this morning's test, BEL2 was tuned in on its 738 kHz frequency on the PL-606 for the first 20 seconds of this MP3 (along with a 2 kHz heterodyne and 740-KCBS splatter), while the second 21 seconds were recorded on 737 kHz  http://www.mediafire.com/?p8kkulbnnpdhp2s . Although the 1 kHz offset tuning did remove the heterodyne and 740 splatter, it also removed most of Taiwan's signal, a result similar to the PL-310's "soft mute" behavior.
     Further testing against both the PL-310 and PL-380 confirmed that the PL-606's soft mute behavior is very similar to that of the PL-310, although because the new radio's AM sensitivity is significantly superior to that of the PL-380, even with its greater "soft mute" drop off, the new PL-606 can usually match the PL-380's TP-DX station signal quality when 1 kHz detuning is used. Surprisingly, the compact PL-606 has been matching the larger PL-310 in AM sensitivity on all frequencies from 530-1700 kHz.
     The lack of a direct-entry keypad on the PL-606 makes it necessary to rotate the thumb wheel multiple times in order to shift from the low band to high band, unless stations are already stored in memory. Another quirk (at least in my PL-606 review model) concerns accessing the LW band. In a PL-360-style mystery system, the PL-606 lacks any front-panel indication that it can even tune the LW band, nor does the current user manual tell you how to access the frequencies. The method is to turn off the radio, press the 9/10 kHz control down until "9 kHz" disappears (and the clock comes back), then press the "MW" control down until "LW On" disappears (and the clock comes back). Although that is the LW-band access procedure, in the case of my review model, the radio still has a quirk somewhere that is preventing LW reception.
     The PL-606 is noticeably smaller and lighter than either the PL-310 or PL-380, and probably shares a lot of compact circuitry with the tiny, vertical-form PL-360. The new model can be reasonably pictured as a horizontal form PL-360 with far superior AM sensitivity, and with all the Si4734 DSP filtering options. That's a very effective combination of sensitivity, selectivity and portability on the AM band-- with a pretty low price as a bonus.
 
73 and Good DX,
Gary DeBock
 
(Photo below is also at  http://www.mediafire.com/?b2biy0s21zgo5dc )
 
                                                                                    
    
 


Re: Bit OT: Why nulls improve with tilting?

Rik
 

I have wondered the same thing. The only thing I could think of, is that by tilting a loop antenna, you are narrowing the beam. The figure 8 pattern is as viewed from above in 2 dimensions, but it is actually a cone in each direction and by tilting, you are using a narrower section of the cone. That is just my guess. I hope some one who really knows will chime in and tell us. - FARMERIK

--- In ultralightdx@..., "huelbe_garcia@..." <huelbe_garcia@...> wrote:

Hello all!

Stephen posted a few hours ago a note on something I always wondered the
reason: tilting the antenna does improve nulls of groundwaves. I can't
think on an good explanation why this happens :)

As all MF stations use vertical irradiators, I think no tilting would be
needed to null the station completely, specially when tuning groundwaves.

But this is not the case. Most of the time, the local stations need some
tilt to null it out. Only when I hear not-so-local stations (say some
20mi/30km away), tilting is not needed anymore.

Would you guys guide me why we need tilting on groudwave MF?

Thanks a lot!

Huelbe.


Bit OT: Why nulls improve with tilting?

huelbe_garcia@fastimap.com <huelbe_garcia@...>
 

Hello all!

Stephen posted a few hours ago a note on something I always wondered the reason: tilting the antenna does improve nulls of groundwaves. I can't think on an good explanation why this happens :) 

As all MF stations use vertical irradiators, I think no tilting would be needed to null the station completely, specially when tuning groundwaves.

But this is not the case. Most of the time, the local stations need some tilt to null it out. Only when I hear not-so-local stations (say some 20mi/30km away), tilting is not needed anymore.

Would you guys guide me why we need tilting on groudwave MF?

Thanks a lot!

Huelbe.


Re: Puyallup, WA Ultralight TP's for 11-3

bbwrwy
 

Gary:

I had to be Enid early this morning, so I wasn't able to listen like I wished. I did turn on a barefoot PL-310 for a couple of minutes before 1100 UTC and there were weak carriers on 774 and 972 kHz. Last evening, the France Info station on 1377 kHz was audible with the best signal of the fall. Hopefully TP signal propagation will be better tomorrow.

Richard.

Richard Allen
36°22'51"N / 97°26'35"W
(near Perry OK USA)


Re: So what is DX let me tell you.

Phillip Fimiani
 

During a meteor peak shower... not long....they only last seconds too!
 
Best Regards

Phil
Lat: 40.8367633
Long: -74.1768412



From: jlochey
To: ultralightdx@...
Sent: Wed, November 3, 2010 8:39:21 AM
Subject: [ultralightdx] Re: So what is DX let me tell you.

 

That is really super cool!

That is DX'ing to the extreme!

I wonder how long he waits to hear something???

Thanks,

John

--- In ultralightdx@..., "Michael Evans - Mike MBR" wrote:
>
> Dx can be that 250mW station two miles away or that 50mW station no matter what the band the signal is on, 10 miles away.
> How about this for DX, on one of the VHF FM DX groups a guy listens for meteorite pings and this reception but for a few stations, is that dx or even dxing!
> As to whining I do so hope I am not one of them.
> Good D= distance...X= unknown.
> Mike MBR UK.
>



Re: Puyallup, WA Ultralight TP's for 11-3

pianoplayer88key
 

I would have tried for some TPs this morning, but I slept right through my 6:15am alarm. (Sunrise is 7:15am for local AM stations, at least until DST goes off next Sunday.) (Maybe I should use something other than KFI, although now that baseball postseason is over it's not going to be XEPRS, at least till next spring probably.)

As for checking the soft-mute of the PL-606, I would like to suggest one way to do it. Find a signal that's somewhat weak but readable (and above any soft-mute threshold that may exist) when you aim at the transmitter, that can be nulled completely by rotating the PL-606. While listening to the signal, you can slowly rotate the radio to weaken the signal until it sinks down into the noise. If you hear any steps in the level, it definitely has soft mute. (As for how to actually measure it, though, I'm not sure how to do that.)
Alternately, if you're getting similar midday AM skip that I seem to be experiencing right now, you could find a weak to medium signal toward the upper end of the band (usually above 1500 kHz) that's normally unreadable midday in summer, and listen to it.
A third way would be to take a relatively steady weak-to-medium signal (barefoot SNR shouldn't exceed about 15-20dB or so), then take one of the smaller loops near it and slowly detune the loop to notch out the signal, listening for any steps in the audio level.

Also what does the barefoot PL-606 read on 1450-KSUH and on 1430 and 1470 (or if stations are audible there, 1435 and 1465), when facing KSUH, and also when nulling KSUH?

--- In ultralightdx@..., D1028Gary@... wrote:

Hello All,

This morning's Asian signals ranged from comatose (at 1300) to fair
(around 1420), with some moderately good "big gun" TP audio during brief
moments. The first band check at 1300 was miserable indeed, with even all the
Asian carriers way down in the noise (this was probably the same situation
that Bill noted). The comatose band gave every impression of being down for
the count, although around 1330 the dead carriers started springing to
life, and before 1400 a few "big guns" like 747 and 774 were producing fair
audio through the domestic splatter. The situation continued to gradually
improve until around 1420, when 738-BEL2 produced enough fair Chinese audio
for a "soft mute" test of the new Tecsun PL-606 Ultralight radio model (more
later). The second-tier TP's never really got out of the gate this morning,
though, and the usual Chinese overachievers like 936-Anhui and 1377-CNR1
were silent. Several Asian powerhouses like 648-VOR and 972-HLCA were decent
around 1430, though, and 657-Pyongyang got in a few weak Korean tirades
before the band collapsed around 1445. In general the morning's session was
lackluster, but certainly much better than its prognosis at 1300.

The following were heard on a C.Crane SWP Slider model (7.5"
loopstick) and a new Tecsun PL-606 stock model, inductively coupled to a 9' sided
PVC tuned passive loop (in the cold back yard). A modified ICF-2010 (30"
loopstick) was used as an SSB spotting receiver:

594 JOAK Tokyo, Japan Fair-good Japanese talk program 1412
603 HLSA Namyang, S. Korea (presumed) Threshold music 1417
648 VOR Razdolnoye, Russia Fair-good JJ audio late at 1430
738 BEL2 Penghu, Taiwan Fair male-female Chinese speech at
1418 _http://www.mediafire.com/?a1vlskgi1aeun4n_
(http://www.mediafire.com/?a1vlskgi1aeun4n)
747 JOIB Sapporo, Japan Fair Radio English conversation study
program at 1348 _http://www.mediafire.com/?s7kgh4qhqtdxx1o_
(http://www.mediafire.com/?s7kgh4qhqtdxx1o)
774 JOUB Akita, Japan Fair Radio Chinese program in bad KTTH
splatter around 1416
828 JOBB Osaka, Japan Fair-good Radio Chinese around 1407
972 HLCA Dangjin, S. Korea Fair-good Korean speech at 1410
1134 KBS3 Hwaseong, S. Korea Poor-fair Korean in splatter 1355
1566 HLAZ Jeju, S. Korea Fair-good Japanese religious pgm 1342
1575 VOA Ban Rassom, Thailand Poor-fair Asiatic language 1414

For those interested in the new Tecsun PL-606 (the newest 1 kHz DSP
Ultralight model), a "soft mute" test was run on the fair signal from
738-BEL2 (Taiwan, in Chinese) at 1420 this morning. The new PL-606 was
inductively coupled to the 9' PVC loop, and a recording was made on 738 kHz for the
first 20 seconds, and then on 737 kHz (1 kHz farther from the 740-KCBS
splatter) for the next 21 seconds.
_http://www.mediafire.com/?p8kkulbnnpdhp2s_
(http://www.mediafire.com/?p8kkulbnnpdhp2s)
Although the KCBS splatter and 2 kHz heterodyne disappeared on 737, so did
much of Taiwan's signal, unfortunately. In this respect the new Tecsun
PL-606 may resemble its PL-310 sibling, more than the reduced-soft-mute PL-380
model. Further tests are planned later today on the highly sensitive new
radio, the most compact 1 kHz DSP Ultralight on the market.

73 and Good DX,
Gary DeBock