Guest Post: July 2016 Rockwork 4 Ocean Cliff DXpedition

Many thanks to SWLing Post contributor, Gary DeBock, who shares this summary of the July 2016 Rockwork 4 Ocean Cliff DXpedition:


July 2016 Rockwork 4 Ocean Cliff DXpedition

An International Team Gets Full “Exposure” to a Wild New DXing Venue

By Gary DeBock, Puyallup, WA, USA

Gary-DeBock-OceanDX

Introduction

In the previous century the outstanding receivers developed by the Japanese Sony and Panasonic companies introduced many of us to the thrill of shortwave listening as teenagers, and created an unusually dedicated DXer hobby group in Japan, as well. The Japanese MW-DXing group has all along been extremely active in the hobby, although the challenge of English communication has somewhat limited their interaction with other DXing groups.

Recently I was highly honored to introduce several modified Ultralight radios to the Japanese DXers, who not only tried these out with great interest, but who also designed and set up modification procedures for Japanese-made equivalents. One of the leaders in this effort was Satoshi Miyauchi, who has already built not only his own 7.5” loopstick Tecsun PL-380 model, but has also built his own 3 inch and 4.25 inch FSL Tecsun PL-380 models as well. When Satoshi-san inquired about the possibility of participating in one of our Rockwork 4 ocean cliff DXpeditions this summer (along with his friend, the famous Japanese MW-DXer Hiroo Nakagawa), I was thrilled to issue the invitation.

The Rockwork 4 turnoff site on Highway 101 is a sweeping ocean view site about 419 feet (158 meters) directly above the Pacific near Manzanita, Oregon. This would be the first time that any international visitors would participate in an ocean cliff DXpedition. Our North American TP-DXing group has always had a great interest in Japanese DX and Japanese DXers, and this would be the first major North American DXpedition to feature MW-DXers from both countries. Canadian Nick Hall-Patch (of Victoria, B.C.) also was highly interested in participating with the Japanese, and as such, our 5-man DXpedition group was composed primarily of DXers from other countries (with only Tom Rothlisberger joining me as repeat American participants).

Although my own DXpedition efforts started on the morning of July 5th, Nick and Tom both joined up for the session on Saturday, July 9th. We all welcomed our Japanese guests (with a joint dinner at the aptly named “Tsunami” restaurant in Wheeler, Oregon) that evening, and prepared for what we hoped would be a very memorable DXing session early the next morning.

OceanDX-CrewWell, it certainly was very memorable—in the worst possible way. A toxic mix of gale force winds and pounding rain was hammering the ocean cliff site as soon as we arrived for antenna setup at 1015 UTC (0315 local time), which was far and away the worst weather that any of us had ever experienced in an outdoor DXpedition. The sensible Japanese had at least brought suitable rain gear for the session, which was more than the careless North Americans had brought. Tom and I ended up thoroughly drenched and shivering as soon as the antennas were set up, while Nick was partially drenched. A single 15 inch FSL antenna was set up on its PVC base and strapped tightly down to the ocean cliff wall with heavy-duty plastic tie wraps, enabling Satoshi, Hiroo and I to track down some New Zealand, Australian and Tahiti DX with our Ultralight radios despite the vicious weather. Tom’s broadband loop supports absolutely refused to stay upright in the gale force winds, and he eventually had no option other than going outside in the nasty weather to hold one of them in the vertical position manually as he recorded DX on his Perseus-SDR. Nick’s active vertical whip was relatively impervious to the vicious weather, but he was drenched from the knees down because of the pounding rain during its early morning setup.

OceanDX-2

That entire July 10th session was thoroughly miserable for all of us, but both Satoshi and Hiroo showed great optimism and determination throughout the three hour struggle, which made all of us highly motivated to do the same!

Fortunately, DX (and weather) on the next (and final) morning would allow our Japanese and Canadian guests to experience the South Pacific DX propagation that this cliff is famous for providing. Satoshi and Hiroo became quick experts in New Zealand “big gun” stations, and Satoshi had a great thrill when 738-Tahiti pounded in at an S9 level on his homemade 3 inch FSL Tecsun PL-380 portable.OceanDX-Car

Propagation definitely favored New Zealand throughout the week (in one of the most Kiwi-slanted trips that has ever been observed here). Although we had a near-daily blowtorch signal from 738-Tahiti and occasional reception from 1017-Tonga, Australian signals generally had a rough time in the NZ-slanted conditions. Tom and I both agree that overall propagation was down somewhat from the exceptional conditions we enjoyed last summer (when we enjoyed good reception of stations like 558-6WA and 558-Fiji) but the chance to welcome the Japanese DXers made the experience especially memorable, and their skill and determination was an inspiration to us all. Listed below are the DU loggings made with my Ultralight radio + FSL antenna combos, which performed quite well throughout the vicious weather challenges on July 10th (better than the drenched and shivering DXer that created them, actually). The DU loggings made by the other DXers will no doubt exceed these, but we all had great fun together, and are looking forward to the next joint DXpedition (either here, or in Japan).

531   4KZ   (Innisfail, Australia, 10 kW)   MIA during Kiwi-slanted propagation on most mornings, it made it through at a modest level with its classic oldies format and interval signal during PI fade at 1209 on 7-5

https://app.box.com/s/phtsbdii0tatmxeb0qfq677it0emsa3i  

531   More FM   (Alexandra, NZ, 2 kW)   Rare low-powered Kiwi station played hard to get, but did show up during a deep PI fade in Kiwi-slanted propagation at 1222 on 7-6. This Kiwi English monolog sounds mostly garbled to me, but the first 5 seconds certainly sounds like “Welcome time to More FM’s blog…” (headphones recommended)

https://app.box.com/s/q527grcf5ee5q2l402sjiwl3syn8d8g4

531   PI   (Auckland, NZ, 5 kW)   Samoan broadcaster dominated on all 7 days with good signals, although 4KZ and More FM did manage to get through at times. This good-level Samoan female speech on 7-5 was typical

https://app.box.com/s/pe8gr1917b4vn3gccskee5gep6go7cft 

567   RNZ   (Wellington, NZ, 50 kW)   Most of this big gun’s legendary transoceanic signal seems to have been destroyed along with its old tower (during the recent demolition). It showed up weakly on all 7 days, although always inferior in strength to its 675 parallel

https://app.box.com/s/2mqql3qwk3vxg0ym5iu4tpi5f8ppvvj7 

576   2RN   (Sydney, Australia, 50 kW)   Kiwi-slanted propagation hit this RN-network big gun pretty hard, but it did show up with mediocre signals not // 657 at 1237 on 7-8

https://app.box.com/s/g39m6brj1dgh6qwx5i7m8xz45ynqu9yy

576   Star   (Hamilton, NZ, 2.5 kW)   The “Dwarf Star” (ex-The Word) was strong enough with its Christian female vocal music to confirm the parallel with 657 at 1244 on 7-11. The first 12 seconds in the recording are 576-Star, and the last 12 seconds are the 657 parallel

https://app.box.com/s/m548dxdvwu1ke99z4e1y2r12prfdf809

585   Radio Ngati Porou  (Ruatoria, NZ, 2 kW)   Wispy male speech was received at 1234 on 7-6 sounding like the usual Maori announcer, but the 603 // apparently started a new song right during the parallel check. Signal nosedived thereafter.

594   Rhema   (Timaru/ Wanganui, NZ, 5/ 2 kW)   Modest level Christian music // 684 at 1250 on 7-6. Usually a little stronger than the 684 parallel, with no sign of Aussie big gun 3WV during the Kiwi-slanted conditions

https://app.box.com/s/m2d7qbws87z5z1jg8d8n4lvqmz298p8k     

603   Radio Waatea   (Auckland, NZ, 5 kW)   Usually the strongest of the Maori network, this vibrant regular plays a mix of Maori and Motown music. Its strongest signal was on the last day (7-11) at 1218

https://app.box.com/s/xdxju7jr1flspiln9nz1havsvd8gy85o

657   Star   (Wellington/ Tauranga, NZ, 50/ 10 kW)   Christian hymn broadcaster owned the frequency during the Kiwi-slanted conditions, with this good-level music at 1211 on the last day of  7-11

https://app.box.com/s/mxti60qwfcc3298c541ak4k5p9s3vqj5

675   RNZ National   (Christchurch, NZ, 10 kW)   The new kingpin of RNZ network transoceanic strength (after the demise of 567’s old tower), this relay consistently outperformed its 50 kW parallel. This signal at 1257 on 7-8 was typical

https://app.box.com/s/wx9b9i1dex7mqyrb9b9zgbnk1n3svwew 

684   Rhema   (Gisborne, NZ, 5 kW)   Christian contemporary music broadcaster with fairly good signals // 594 at 1247 on 7-9; Tony W. says that the tower property has been sold and eviction is forthcoming

https://app.box.com/s/691ddrcehygaiko5pgpll2jp1nu1en91

702   2BL   (Sydney, Australia, 50 kW)   Easily pushing 702-Magic aside whenever it showed up, this Oz big gun was the dominant station on both 7-7 and 7-10. The interview format was much different from Magic’s oldie music

https://app.box.com/s/f0qfop5x7ymw1gbyowg65obveuqjwf6m 

702   Magic   (Auckland, NZ, 10 kW)   Capable of blistering signals when Kiwi propagation was enhanced, this oldie music broadcaster was the only DU on the frequency on 5 of 7 days

https://app.box.com/s/gtd8u8zxduwpirycbso99kigyum2ja5c

738   Radio Polynesie   (Mahina, Tahiti, 20 kW)   A real blowtorch on most days, this French-language signal at 1233 on 7-9 was the strongest DU recording made during the trip, and seriously tested the crunch resistance of my Ultralight radio

https://app.box.com/s/pw2gpfgh7vd19b33yz8ag7466y18462t

756   RNZ   (Auckland, NZ, 10 kW)   Pretty good signal with music // 675 at 1212 on 7-8, a good demonstration of the cliff’s ability to cut down splatter from the 750-Portland pest (50 kW and only 70 miles away)

https://app.box.com/s/qlx6esrtgccrg32pkwqt0yr71suuw52d

765   Radio Kahungunu   (Napier-Hastings, NZ, 2.5 kW)   Once again this low-powered Maori network station acted very much like a Kiwi big gun throughout the week. Maori and Motown music is the norm, as in this recording // 603 at 1215 on 7-8

https://app.box.com/s/p04c5i3fvvpxfw449nbsa2jlwmipsh6n

774   3LO   (Melbourne, Australia, 50 kW)   LR Network big gun was strong at 1222 on 7-5 but missing in action under Radio Sport on most days

https://app.box.com/s/egf89xhr29obvisblm7cb9bzehid62jh

774   Radio Sport   (New Plymouth, NZ, 5 kW)   Not nearly as strong as its 792 parallel, it was hit hard by Seattle splatter on most mornings, and never came up in strength for a decent recording

783   Access Radio   (Wellington, NZ, 10 kW)   Multi-cultural station with varied ethnic programming, this apparent Samoan language music and speech was received at 1241 on 7-7

https://app.box.com/s/yg4xp9r7er4hyul4jvcpsr5x747vqkf2

792   Radio Sport   (Hamilton, NZ, 5 kW)   Fairly strong on most mornings with its network relay of Fox Sports News, the Yankee-accented English owned the frequency on all 7 days (over the MIA Oz big gun 4RN)

https://app.box.com/s/um0gfok28blvq90n0eeoeuuoq3v5jzzy

828   3GI   (Sale, Australia, 10 kW)   On a couple of occasions this LR network big gun was just strong enough to confirm the parallel with 774, but most often it was in a ghostly mix with a presumed Radio Trackside (which never came up in strength for a decent recording).

891   5AN   (Adelaide, Australia, 50 kW)   Another underperforming Oz big gun, it was usually in a threshold-level mix with another DU English station (probably 4TAB).

936   Chinese Voice   (Auckland, NZ, 1 kW)   A prime target during enhanced Kiwi propagation, this low-powered ethnic station came through with fairly good-level music and Chinese speech during exceptional propagation at 1243 on 7-6

https://app.box.com/s/sng6i7c70sqm3e5bpymy3mfy1dbpbfdn

1008   Newstalk ZB   (Tauranga, NZ, 10 kW)   Getting through the 1010 splatter at a modest level // 1035 at 1220 on 7-7. Generally not as strong as either the 1035 or 1044 parallel

https://app.box.com/s/8l5sn7mayuwkzs896lbciw4s1e8738dw

1017   A3Z   (Nuku’alofa, Tonga, 10 kW)   Rushed antenna setup prior to 1130 on 7-9 paid off with a fairly good-level logging of male speech from this station, the only foreign language DU on the frequency. Since A3Z’s sign off is usually prior to sunrise enhancement at the cliff, the best chance to track it down is during its late Saturday night transmission, when it typically stays on a little later

https://app.box.com/s/jz35gvlr8re5ldfqol9h6ux0kd04dea5

1035   Newstalk ZB   (Wellington, NZ, 20 kW)   The flagship relay of this talk radio network had potent signals on most mornings, including this excellent-level discussion concerning NZ real estate at 1222 on 7-8

https://app.box.com/s/a21xkbboz6pbbqj73lj0ted4ft3fjiua

1044   Newstalk ZB   (Dunedin, NZ, 10 kW)   Fairly strong on most mornings with the usual call-in talk program and occasional music // 1035. This recording was at 1210 on 7-9

https://app.box.com/s/z7flaydc0if63v9qhro7deyvp3rno67d

1386   Radio Tarana   (Auckland, NZ, 10 kW)   Hindu music broadcaster pounded in when Kiwi propagation was enhanced (as in this recording at 1246 on 7-6), otherwise it got lost in splatter

https://app.box.com/s/aaguop8hp57aa38eulommx06tm3l22qw

1503   Radio Sport   (Wellington/ Christchurch, NZ, 5/ 2,5 kW)   Yankee English from the relay of Fox Sports News (// 792) was usually audible on this frequency on all 7 days

https://app.box.com/s/wed793j34pnu0thkulc3w8o7v716gs98

73 and Good DX,
Gary DeBock (DXing at the Rockwork 4 Ocean Cliff near Manzanita, OR, USA)
7.5″ loopstick C.Crane Skywave Ultralights (3) +
15″ and 17″ FSL antennas


Tom-Photo

Report from Tom Rothlisberger

Saturday July 09 

Three of us on the ocean cliffside pullout this morning. It took some time to set up everything as this was a new antenna and configuration for me at the cliffs, and I was planning to experiment with a vactrol for the first time. A major setback occurred when my Win10 notebook refused to recognize the Perseus hardware due to a possibly corrupt driver. To make matters worse I did not bring the backup MSI Wind U100 that I have been using for years with good results. Note to self: always bring backup. I wound up borrowing Nick’s netbook as he did not need it for experiments that morning. So it was 1222 by the time I started recording. Magic 702 was slamming in and 1KW TAB Trackside on 549 was in nicely but briefly. I didn’t think the session was as good as what was experienced last year but everything was working and signals were loud at times, usually briefly, before settling back down into the noise. Little high band action but 1503 Radio Sport was in.

Sunday July 10

Driving rain and gale force winds were making things miserable. My antenna spreaders blew down time after time. For the last 15 minutes of the opening I was holding one up outside by hand, the other secured to the rock wall by heavy straps.

This turned out to be a morning favoring Australia. 1116 4BC was ruling the band with huge signals, I had Aussies on 702 and 936 instead of NZ stations. The ABC News fanfare was heard on 891 on the half hour and there was audio on 1566, 1611 and 1701. This was the only of the three mornings the whole band was in although not very robust like it was last August. IDing signals is still ongoing.

We were all soaked to the bone when it was over, my Gore-Tex jacket was no match for that storm. Distinguished visiting DXers Hiroo-san and Satoshi-san were still smiling at the end. That’s really the important thing, to have fun and overcome adversity. That we heard any stations at all was an added bonus. And we did hear some! We will always remember this morning.

Monday July 11

Another mostly New Zealand morning, decent signals but they would fade back down after a minute or two, and something else would become strong elsewhere on the band, one at a time. This made getting parallels for ID purposes difficult. On several frequencies NZ and Australia signals were fighting it out. It was another low band morning. The TAB Trackside affiliate on 1224 (1 KW) was briefly good but almost nothing heard above it except for occasional audio from Radio Sport 1503. 738 Tahiti was slamming in with meter-bending signals. Satoshi-san and Hiroo-san seemed very pleased as this station is considered rare and exotic DX from Japan.

Overall: 657 Star gets the award for strongest and longest lasting DU signal over the three days, beating last year’s champions 1035 Newstalk ZB and the no longer potent RNZ 567. I had more wire up this year but the signals were really no better. I failed to find a “sweet spot” with the vactrol for reducing splatter from the Portland powerhouses.

Longwave: DX NDBs were practically non-existent. I am wondering if the antenna configuration made it deaf at LW, or if conditions were really that terrible. Only one DX station, 352 KHz “RG” Nikau, Rarotonga, Cook Islands was noted. 531 PI was also exceedingly weak so I suspect the antenna. I will be changing things again at my next visit to the ocean cliffs to ensure I get more LW action.

73, Tom  K7WV


Nick-Hall-Patch

Report From Nick Hall-Patch

As promised, a logging or two, and a couple of photos:

549 NEW ZEALAND, Napier-Hastings, TAB Trackside Radio. Man talking, sounded like announcing a horse race, becoming fair //828 1220 July 9. (NHP)

594 NEW ZEALAND, Timaru/Wanganui, Star. Light music, poor strength, //909 July 10. (NHP)

693 NEW ZEALAND, Dunedin, Radio Sport. Poor to fair strength, American sport talk //792 1225 July 9 (NHP)

729 NEW ZEALAND, Tokorua, R. New Zealand National. Light Dixieland style mx, poor strength, seemed //675 but slightly offset so hard to say for certain. Only there for a minute or two, 1212 July 9. (NHP)

747 JAPAN, Sapporo, JOIB. Briefly poor and //774, with man in what sounded like Japanese, certainly not DU English, 1136 July 10. (NHP)

774 NEW ZEALAND, New Plymouth, Radio Sport. Fair to good signal, earlier //792 with American sport talk, bit of electrical noise, unusual for this quiet location, 1227 July 9. (NHP)

792 NEW ZEALAND, Hamilton, Radio Sport. American sport talk, fair strength in splatter //774 1224 July 9. (NHP)

Ocean

828 NEW ZEALAND, Palmerston North, TAB Trackside Radio. Horse race announcer, fading up to good strength with a little splatter, 1223 July 9, earlier ID’ed by //549. (NHP)

1611 // 1629 t AUSTRALIA, but who? 1216 July 10.

http://www3.telus.net/public/shallpat/rockworks/1611_1629parallel_20160710_1216.wav

Not what I would call listenable, but somewhat identifiable DX, could be a preacher, which might be Vision Radio Network, but several sites on each channel. Not heard on other days, so a bit out of the ordinary. (NHP)

(NHP) RFSpace NetSDR, RFSpace SDR-14 running DX Fishbarrel program; AMRAD active 4’ whip antenna


Report From Satoshi Miyauchi

(July 28) It is just like last week that we had been there! All those memories are good to remember, including the very precious “welcoming” weather on 10th morning! It just showed that even for short period of stay, at least TWO sessions might be required …

DXing results are of course something that we really appreciate out of the DXpedition, but simply the fact that we could meet up and DXing together means a lot! And also both Hiroo and me were very much impressed by all of your efforts even in the middle of darkness and especially in the stormy weather. As for us also, it was the worst weather we ever had on the day of DXpedition! So in many ways we could get “first ever” in this joint DXpedition! We hope that we all can meet sometime in the future either at the cliff, Cliff in Japan, or any other location in the world! Thanking you once again for your hospitality, and actual support on equipments that we could use throughout the DXpedition!

Best 73,

Satoshi Miyauchi


DXpedition Videos

First Day Tour (July 5th, FSL antenna setup)

http://www.youtube.com/watch?v=MBeoUF0ruvQ

July 9th Antenna Setup (Tom, Nick and Gary)  

http://www.youtube.com/watch?v=V8Kn2vrBzK0

The Session from Hell (July 10th)  

http://www.youtube.com/watch?v=Lw9k6E08eME

Final Day Success (July 11th)  

http://www.youtube.com/watch?v=cjda-kO_oQE


Wow! Gary, thanks so much and thanks to all of the team members–Hiroo, Satoshi, Tom and Nick–for sharing your experiences. Though your weather was less than desirable, it appears your DX was quite successful. You’ve so many mediumwave loggings from New Zealand, I’m convinced you were actually in New Zealand! Most impressive!

Most importantly, it sounds like you all enjoyed a little DX fellowship. At the end of the day, that’s what it’s all about.  We look forward to future DXpedition reports!

The PantronX Titus II: A New DRM Receiver

titus 2 big

I had heard rumors that a new DRM receiver was in the works, but had not yet seen any specifications. DRMNA.info has just posted a few specs:

The PantronX Titus II is actually a full SDR solution in a boombox case. Few details yet, but it is running Android, has a 100 kHz to 2 GHz receiver on-board and decodes AM, FM, SSB and DRM natively.

It uses a Quad-core Arm A53 @ 1.2 GHz, 1 Gig of RAM and 8 Gig of on-board Flash. 7″ TFT display and supports Android 5, 6 or custom remixes.

Click here to read the full post at DRMNA.info…

Guest Post: A WRNO Worldwide Transmitter Site Visit

Many thanks to SWLing Post contributor, Dan Brown (W1DAN) for the following guest post:


A WRNO Worldwide Transmitter Site Visit

by Dan Brown W1DAN

WRNO-logo

The opportunity to visit a shortwave transmitter site does not come to me often. It did during the summer of 2009, so I jumped at the chance. Along with friend Bob K5IQ, we visited the WRNO Worldwide transmitter in New Orleans and were guests of Chief Engineer Larry Thom. He kindly showed us the transmitter site, talked of the interesting technical story of the rebirth of the WRNO Worldwide transmitter site and displayed some of his ingenious technical adaptations to create a smooth running plant.

Fullscreen capture 8222016 40935 PM

Larry smiles as Bob Is amazed at the innards of the WRNO HF transmitter!

Originally put on the air as the first commercial shortwave station by local New Orleans radio owner Joe Costello in 1982, and purchased by Dr. Robert Mawire of Good News Outreach in 2001, the now non-profit religious station is fed from Fort Worth Texas studios. The transmitter, still in the New Orleans suburb of Marrero, primarily operates at 7505KHz and can be heard evenings from 1200 to 1400UTC (8PM to 10PM EST).

The plant’s main feature is an Electronic Corporation (Elcor) SW50/3S fifty kilowatt transmitter (see Figure 1). Built in Costa Rica, this transmitter feeds a TCI 516-3 log periodic antenna that was a mainstay of the Joe Costello rock and roll days of WRNO Worldwide. The transmitter is plate modulated and uses time-tested circuitry such as vacuum tubes, relay control and crystal oscillators as compared to solid-state modulators and microprocessor control. The system sends effectively a 3 megawatt signal around the world.

Figure 1. Larry describes the Elcor transmitter. In the foreground is the control cabinet with the control relays out front for easy access.

Figure 1. Larry describes the Elcor transmitter. In the foreground is the control cabinet with the control relays out front for easy access.

Interestingly, Larry incorporates baking thermometers to measure the exhaust air temperature. Cheap and efficient! In order to get the transmitter to work properly two interesting adaptations were required. The first was the transformation of the output impedance from 50 ohms to 75 ohms.  This was done using a custom Elcor transformer as shown in Figure 2.

 

Figure 2. Elcor custom RF transformer

Figure 2. Elcor custom RF transformer

This impedance transformer feeds a TCI high power BALUN (BALanced to UNbalanced transformer, but here run in reverse), as the TCI antenna requires a balanced feed. The BALUN is a commercial TCI unit and is shown in Figure 3.

Figure 3. TCI BALUN takes unbalanced RF from transmitter and feeds the 300 ohm balanced TCI Antenna. How big is your BALUN?

Figure 3. TCI BALUN takes unbalanced RF from transmitter and feeds the 300 ohm balanced TCI Antenna. How big is your BALUN?

Another interesting adaptation became necessary, as the transmitter would often trip the main breaker when it was placed on the air. This problem was due to the high inrush current that would occur when the high voltage power supply was energized. Larry went to Grainger supply and bought high power heating elements and time delay relay. He inserted this in the primary three-phase feed to the power supply. Now, when the supply is switched on, the heating element provides a series resistance (and heats up for a moment) to absorb the inrush. After a short time, the relay would jump the element out to allow full current to feed to power supply (see figure 4).

Figure 4. Heating elements on the upper right inside wall of the power supply limit inrush current.

Figure 4. Heating elements on the upper right inside wall of the power supply limit inrush current.

Another small problem with the transmitter was the drift of the master oscillator. Larry had Elcor build a synthesized oscillator for the transmitter to reduce the drift (figure 5).

Figure 5. Larry with new synthesized reference oscillator module

Figure 5. Larry with new synthesized reference oscillator module

WWL-AM has their 50Kw transmitter on 870KHz near the WRNO Worldwide transmitter. Due to this proximity they send a hefty signal into the WRNO antenna and thus into the transmitter. Here these two signals can mix together to form a soup of audio in the WRNO transmitter tank circuit. A notch filter was constructed to reduce WWL-870’s AM signal (Figure 6).

Figure 6. WWL 870KHz notch filter

Figure 6. WWL 870KHz notch filter

During the visit, Bob and I listened to Larry’s stories and snooped around the building. We spotted a Vintage Radio Labs “Globe King” 500A that is slated as an emergency backup transmitter (Figure 7). It is rumored that this classic redesign of an older transmitter marketed in the 1990’s was a poor copy of the original 1950’s era World Radio Labs Globe King transmitter. Larry states that this transmitter is serial number 1. Only a few were built.

Figure 7. A Vintage Radio Labs “Globe King 500A” backup transmitter (SN1?). The crystal is for the old frequency of 7355 kHz

Figure 7. A Vintage Radio Labs “Globe King 500A” backup transmitter (SN1?). The crystal is for the old frequency of 7355 kHz

Figure 8. Bob K5IQ dreams of calling “CQ DX!” on a 50Kw rig and a 14db antenna

Figure 8. Bob K5IQ dreams of calling “CQ DX!” on a 50Kw rig and a 14db antenna

Figure 9. The Official FCC-approved Reader’s Digest reference modulation monitor!

Figure 9. The Official FCC-approved Reader’s Digest reference modulation monitor!

Figure 10. The audio and control rack. Audio is fed via a T1 line from Texas to the Telos ISDN decoder, then to the Optimod 9000A audio processor (an original from the Joe Costello days). The remote control is a Burk unit that allows the studio folks in Texas to control the transmitter.

Figure 10. The audio and control rack. Audio is fed via a T1 line from Texas to the Telos ISDN decoder, then to the Optimod 9000A audio processor (an original from the Joe Costello days). The remote control is a Burk unit that allows the studio folks in Texas to control the transmitter.

Figure 11. The Marrero, LA transmitter shack heard ‘round the world!

Figure 11. The Marrero, LA transmitter shack heard ‘round the world!

An article I wrote on the re-birth of WRNO Worldwide for the August 2007 Monitoring Times magazine, and the fact that I was on vacation in New Orleans prompted this visit. It is always fun to visit a transmitter site to see how things are done. Thanks to Bob K5IQ for driving!

WRNO-Feedline WRNO-Feedline-B

Figure 12. View from the balanced feed point of the TCI 516-3 log periodic antenna 1ith 14db gain aimed at 20 degrees

Figure 12. View from the balanced feed point of the TCI 516-3 log periodic antenna 1ith 14db gain aimed at 20 degrees

Here are a few web-links of interest:

Copyright
Dan Brown, W1DAN
Created 09/2009
Updated 07/2016


Wow–many thanks for sharing your tour of WRNO with us, Dan! My-oh-my how I’d love to have that 14db gain log periodic at my disposal! Great facility!

Creating a global network of inexpensive remote SDRs

U_Twente_SDR

Many thanks to SWLing Post contributor, Mark Fahey, who replies to Ivan’s preliminary review of the V3 RTL-SDR dongle:

With Shortwave SDRs (the receiver dongle) now costing less than $20, the time has come for us to set up a global group of receivers that we can all log into at will!

RTL-SDR-RTL2832U-e1471375714199Have a look at SDR.hu – here you can put your SDR dongle on line and share it with anyone and they have full control of the receiver just as if it was in their own shack.

Imagine receivers scatted around the world – South America, Tropical Asia, Africa! The cost is now virtually nothing, all that is needed is the dongle, antenna (doesn’t have to be anything special – even a long wire or whip) and a small low cost CPU (Raspberry Pi for example).

Anyone else interested in this dream? Lets get together, get some receivers setup and then talk about our experience in a kick-ass presentation at the 2017 SWL WinterFest in PA!

Also… I am very soon to receive my KiwiSDR matched to a BeagleBone CPU. It will be online at SDR.hu and four remote listeners will be able to tune the full shortwave bands independently, its like my own Twente setup! Heaps of others are getting receivers online in the next few months with KiwiSDRs, this is going to be totally amazing!

I agree, Mark! While there is already quite a network of remote SDRs and receivers in the world, the barrier of entry keeps getting lower and lower. It’s hard to imagine that $25 can buy an SDR that natively covers the shortwave and mediumwave bands!

There’s only one other requirement for an online SDR that Mark didn’t mention: a decent Internet connection. Sadly, this is the only thing keeping me from hosting a remote SDR here at my home. I considered purchasing a KiwiSDR like Mark, but my upload speed (0.2-0.3 mbps) is so terrible and so unreliable that I could only host one listener at a time at best. You can bet that as soon as my ISP upgrades our service, I’ll launch a web SDR as well.

Of course, I’m willing to bet that most SWLing Post readers have more than enough bandwidth to host a $25 remote receiver! Let’s make Mark’s vision a reality!

Ivan’s preliminary review of the new RTL-SDR dongle on shortwave/mediumwave

RTL-SDR-RTL2832U-e1471375714199Many thanks to SWLing Post contributor, Ivan Cholakov (NO2CW), who shares the following video review of the new RTL-SDR dongle on the shortwave and mediumwave bands.

Ivan notes:

This is daytime reception comparison. Nighttime could be a different picture. [The RTL-SDR dongle] tunes and frequency is 100% on spot.

Using SDR Sharp you have several AGC settings to play with and find the best combination. The best setting seems to vary with band and signal strength.

The [SDR receiver] comes with a short (20 cm) and long (120cm) telescopic antennas. Neither one is usable for HF or Medium wave.

When ordering the radio you have to get a USB extension cord for the dongle. When plugged in directly into a laptop and then antenna coax it can become bulky. You also will most likely need an SMA adapter to BNC and SO 238.

I hope this helps.

Click here to view on YouTube.

Many thanks for sharing your video, Ivan! For a $25 SDR, I’m pretty impressed so far! I’m also very curious how it will hold up to stronger nighttime signals and, especially, adjacent signal interference. I imagine it may be prone to overloading as well. Please keep us posted!

Have any other Post readers tested the new RTL-SDR dongle on HF? If so, please comment!