Antennas

Left: The terminating resistor of currently 820 ohms is waterproof in an HT tube. The connections are mounted on lamp terminals, without much effort to remove.

Center: Middle: The mast top in 7.50 meters, to the left of K9AY mast. An aluminum tube of 4 m length carries the tip, attached to the plum tree with clamps, freestanding.

Right: The 9:1 balun also resides in an HT pipe. The 4m long mast made of aluminum stands with only 2 guy wires in a ground pipe, which once served as a prop for a parasol. I still wrap my balune myself ...

For the 40 m long wire I use galvanized uninsulated electric fence wire with a diameter of 1mm. Source: 1000 m / < 33 €

Shot 1: Flag-Loop. The noise level is near -138 dBm, signal at -105.3 dBm. Direction 80°.
Shot 2: K9AY. The noise level is near -130 dBm, signal at -107.1 dBm. Direction 35°.
Shot 3: 50 m longwire. The noise level is near -127 dBm, signal at -108.5 dBm. Direction 30°. Connected two CMCC.

It looks a bit better than I suspected in the last post. The antennas were for comparison without preamplifier.

Note: A precise statement can not be derived from this, all antennas should have had the same direction.

The loop has a total circumference of almost 40 m and closes the gap between northeast and southeast of K9AY. The top of the mast is 7.50 m high. The direction of reception is 80° across the northern Indian subcontinent, via Southeast Asia, western Australia and the New Zealand South Island, huge targets for MW-DX.

The loop can be relocated with a few simple steps, if necessary. For Central America reception, only balun and resistance are reversed. As it is rather quiet without a suitable preamplifier, it is amplified by the RPA-2 from DX-Engineering. This brings 17 dBm, which is still 10 dBm below the noise figure of the the K9AY or the 50-longwire.

The flag loop was built according to the pattern of FO0AAA, but is twice as large. The audible front-to-back ratio is better than K9 and longwire, as is the directivity. It was the only antenna that audibly filtered Palangkaraya, Indonesia at 3325 kHz (31.9.2019, 17z).

So much wood for an antenna that is suspended relatively quickly. Some preliminary work is nevertheless necessary for the measurements to be correct.

More additions to the loop will bring time. Now I'm curious.

Left: In the HT box at 4 m height is a Beverage Antenna matching set. The HT box was overhauled and re-waterproofed.

Middle: the CMCC was connected to the HT box with a 75 ohm coax cable at a distance of 5 meters. The ground rod is a discarded water pipe.

Right: a poplar serves as a holder for 3 long wire antennas, each 50 m in length. Not shown: a 2nd CMCC 5 m away from the receiver.

How are the CMCCs? First tests brought a significantly reduced QRN under thunderstorm disturbances.

Common mode choke coils act as a simple wire against push-pull current (signal), while acting as an inductor against common mode current (noise).

The kit, concerned on the HAM radio, contains all the necessary materials to quickly assemble a CMCC box. Only a 16mm drill for the PL jacks and another narrow drill bit for the screw feedthroughs are required, apart from the soldering iron. The box is IP55 certified and can be waterproof if you work carefully on the holes. The three central ferrite cores are shrink tubing sheathed, the associated thin coax cable is cut to the correct length sufficient. For a tech-savvy hobbyist, the assembly is easy, even if as in my case the instructions are missing and can not be delivered on request. The substitute transmitted by the manufacturer images of the open finished box could not help. In particular, I could only do the screwing with a number of washers at its own discretion. Since the screw connection also affects the water resistance of the box there are a few points deduction at this point. Also because the screws are not retractable as shown on the website, but come as slotted screws therefore. Another point loses the box due to an oversized wing nut that does not want to fit on any of the screws. Replacement by post was announced after a prolonged contact with the manufacturer.

Two of the boxes are inserted into the coax cable, one 5 m from the antenna's feed point, the other one 5 m from the receiver entrance. From the earth connection of the box a grounding line must be applied to the ground spike. These are not included in the kit. The earth connection is small in size, more than a 1 mm Ø line does not allow the eye with the pin. The wing nut would dress better if one had chosen a larger one. At this point, you can only rework yourself and realize your own ideas of a good ground connection.

The kit cost on the HAM radio 27 €, so 54 bucks for 2 CMCC boxes + a can of cold beer for free, which you can easily drink away while writing the many emails to the manufacturer.

The CMCCs significantly reduce thunderstorm disturbances. The 50-m antenna now has 4 grounding points.

A small but fine opening to Peru I could observe on 11.5.2019 between 0315 and 0400 UTC. Although the signal strength was consistently weak, there were 5 new stations for me.

08E40/50N35 [SDRCONSOLE3, 50-m longwire 210°, RPA-2]

1250 0329 PRU Radio Cora, Lima (lim) ID Radio Cora 10742 km
1380 0330 PRU Radio Nuevo Tiempo, Lima (lim) ID Radio Nuevo Tiempo 10695 km
1500 0331 PRU Radio Santa Rosa, Lima/San Miguel (lim) ID 10745 km
1160 0332 PRU OAX4C Onda Cero, Lima (lim) ID Onda Cero 10757 km
1380 0332 PRU OAX2W Radio Campesina, Cajamarca (caj) ID Campesina 10424 km
1470 0334 PRU OAU6E Radio Victoria, Arequipa (are) ID Radio Victoria 10739 km
1470 0334 PRU Vaughan Radio, Lima/Pantanos de Villa (lim) ID Vaughan Radio - directly followed by a Victoria in the back - Vaugh. -60 dBm, Victoria -70 dBm 10752 km
1500 0336 PRU Radio Santa Rosa, Lima/San Miguel (lim) ID 10745 km
1360 0339 PRU Radio Bienestar, Lima (lim) ID 1360 Radio Bienestar 10742 km
1370 0339 PRU Radio Andina Juliaca, Juliaca (pun) ID Juliaca 10587 km
1570 0400 PRU Bethel Radio, Lima (lim) sev. IDs 10732 km

This section displays the status of my logged USA & Canada states. It will be updated.






List of abbreviations for states

Pin board at Google Maps

Status 31 March 2019

Heard states/green (USA): 29
Confirmed states/red: 0
Latest heard or confirmed: 1700 WEUP, Huntsville, Alabama

Heard states/green (Canada): 5
Confirmed states/red: 1
Latest heard or confirmed:

Map source: Free Software Foundation. The source has been changed.

Excellent propagation conditions on the lower bands brought strong signals in the X-band and below in recent days. In the time around sunrise, around 5 o'clock UTC, it was really fun for a long time to hear Radio Monumental from Quito Ecuador at 1510 kc. But also WPTX from Lexington Park, Maryland at 1690 kc and WGIT Faro de Santidad, Canobas, Puerto Rico at 1660 kc were very well received for some time. Outstanding was also the reception of ZYO701 Radio Roraima from Caracaraí, Brazil at 1390 kc. All logs were made with the K9AY switched to NW.

2019-03-28

700 0410 USA WLW, Cincinnati/Tower Drive (U) (OH) ID 6932 km
800 0452 BES PJB Shine 800 AM (Trans World Radio), Kralendijk (bnr) Transmundial ID 8052 km
1190 0500 CLM Radio Cordillera, Bogotá D. C. (bdc) ID 9105 km
1280 0500 CLM Caracol Radio, Pasto (nar) R Santa Fe ID 9624 km
1620 0500 CUB Radio Rebelde, Guanabacoa/CTOM2 (ch) 8111 km
1660 0500 PTR WGIT, Canóvanas (PR) ID 7360 km
1690 0500 USA WPTX, Lexington Park (MD) ID 6523 km
1510 0505 EQA HCBD1 Radio Monumental, Quito (pic) sev. Ids, big sig! 9820 km
1570 0511 PRU Bethel Radio, Lima (lim) Halleluja ... not so good 10732 km

2019-03-27

730 0452 CAN CKAC, Montréal/Pointe-Calumet (QC) 5843 km
710 0500 USA WOR, New York/Lyndhurst [NJ] (NY) ID 6179 km
1010 0500 CAN CFRB, Clarkson (ON) ID 6331 km
1130 0500 USA WBBR, New York/Carlstadt [NJ] (NY) ID 6175 km
1390 0500 USA WEGP, Presque Isle (ME) 5399 km
710 0501 CUB Radio Rebelde, Camagüey/CTOM1 (cm) 7958 km
1620 0502 CUB Radio Rebelde, Guanabacoa/CTOM2 (ch) 8111 km
760 0505 USA WJR, Detroit (MI) ID 6648 km
1350 0515 CLM Bésame Ibagué, Ibagué (tol) Jingle ID 9204 km
1560 0515 USA WFME, New York/Queens (NY) 6174 km
1290 0519 USA WJNO, West Palm Beach (FL) ID on Newsradio 1290 WJNO 7668 km
1690 0521 USA WPTX, Lexington Park (MD) ID 6523 km
1190 0557 CLM Radio Cordillera, Bogotá D. C. (bdc) ID [SDRCONSOLE3, K9AY N/W AMS/5422 Hz/-72.0 dBm] 9105

2019-03-26

890 0404 USA WLS, Chicago/Tinley Gardens Park (IL) ID 6973 km
700 0500 USA WLW, Cincinnati/Tower Drive (U) (OH) ID [SDRCONSOLE K9AY USB/2996 Hz/-84.0 dBm] 6932 km
730 0500 CAN CKAC, Montréal/Pointe-Calumet (QC) 5843 km
760 0500 USA WJR, Detroit (MI) 6648 km
1010 0500 CAN CFRB, Clarkson (ON) 6331 km
1010 0500 USA WINS, New York/Lyndhurst [NJ] (NY) 6180 km
1180 0500 CUB Radio Rebelde, Chambas/CTOM1 (ca) ID 7938 km
1620 0500 CUB Radio Rebelde, Guantánamo/CTOM3 (gu) 7871 km
670 0501 CUB Radio Rebelde, Camagüey/CTOM3 (cm) ts, ID 7954 km
1690 0504 USA WPTX, Lexington Park (MD) ID 6523 km
1390 0511 DOM , San Cristóbal (cri) tent., heard .. San Cristobal under strong Brazilian STN (unid) 7652 km
1660 0511 PTR WGIT, Canóvanas (PR) 7360 km
710 0515 CUB Radio Rebelde, Chambas/CTOM3 (ca) // 670 7939 km
1390 0516 B ZYO701 Rádio Roraíma, Caracaraí (RR) ID 8440 km
1510 0516 EQA HCBD1 Radio Monumental, Quito (pic) sev. IDs, vy gd sig [SDRCONSOLE3, K9AY N/W USB/2420 Hz/-96.0 dBm] 9820 km
1690 0521 USA WPTX, Lexington Park (MD) 6523 km
1440 0525 CLM Colmundo Radio, Medellín (ant) ID 9065 km
972 1705 KOR HLCA KBS Hanminjok Bangsong 1, Dangjin (ccg) [SDRCONSOLE3/F, K9AY N/E LSB/2049 Hz/-96.0 dBm] 8548 km
594 1709 IND AIR Maitree Channel/All India Radio GOS, Chinsurah/Magra (WB) 7338 km
1467 1730 KGZ TWR PANI/FEBA Radio, Krasnaya Rechka (cuy) 4954 km
918 1733 IND AIR North, Suratgarh (RJ) 5828 km

2019-03-25

760 0400 USA WJR, Detroit (MI) 6648 km
890 0400 USA WLS, Chicago/Tinley Gardens Park (IL) 6973 km
1010 0400 CAN CFRB, Clarkson (ON) 6331 km
1660 0435 PTR WGIT, Canóvanas (PR) 7360 km
1660 0500 ARG Radio Revivir, Isidro Casanova/Gregorio de Laferrere (ba) 11539 km
1520 0528 USA WWKB, Buffalo (NY) 6337 km
1610 0531 CAN CHHA, Toronto (ON) 6304 km
1690 0539 USA WPTX, Lexington Park (MD) 6523 km
1557 1701 TWN Radio Taiwan Int., Kouhu (YL) [SDRCONSOLE3/F, 50m LW 30° RPA-2 LSB/2049 Hz/-78.0 dBm] 9400 km
918 1707 IND AIR North, Suratgarh (RJ) 5828 km
846 1708 IND AIR West, Ahmedabad A (GJ) 6242 km
594 1712 IND AIR Maitree Channel/All India Radio GOS, Chinsurah/Magra (WB) 7338 km
1377 1728 CHN CNR 1, Xingyang/SARFT554 (HE) 8009 km
972 1732 KOR HLCA KBS Hanminjok Bangsong 1, Dangjin (ccg) 8548 km

2019-03-24

760 0400 USA WJR, Detroit (MI) 6648 km
590 0406 CAN VOCM, Saint John's (NL) 4360 km
1690 0413 USA WPTX, Lexington Park (MD) 6523 km
1660 0414 PTR WGIT, Canóvanas (PR) 7360 km
1440 0419 CLM Colmundo Radio, Medellín (ant) 9065 km
1580 0459 CAN CKDO, Oshawa (ON) 6252 km
700 0500 USA WLW, Cincinnati/Tower Drive (U) (OH) 6932 km
730 0500 CAN CKAC, Montréal/Pointe-Calumet (QC) 5843 km
1010 0500 USA WINS, New York/Lyndhurst [NJ] (NY) 6180 km
1010 0500 CAN CFRB, Clarkson (ON) 6331 km
1130 0500 USA WBBR, New York/Carlstadt [NJ] (NY) 6175 km
1400 0500 CAN CBG, Gander (NL) 4410 km
1440 0500 USA WRED, Westbrook (ME) 5741 km
1500 0500 USA WFED, Washington (DC) 6498 km
1540 0500 CAN CHIN, Toronto Island (ON) 6308 km
1560 0500 USA WFME, New York/Queens (NY) [SDRCONSOLE3, K9AY N/W LSB/2800 Hz/-72.0 dBm] 6174 km
1610 0500 CAN CHHA, Toronto (ON) 6304 km
1660 0500 ARG Radio Revivir, Isidro Casanova/Gregorio de Laferrere (ba) 11539 km
1660 0500 USA WWRU, Jersey City/Carlstadt (N) (NJ) 6176 km
1520 0503 USA WWKB, Buffalo (NY) 6337 km
1190 0519 CLM Radio Cordillera, Bogotá D. C. (bdc) 9105 km
1300 0522 CLM Radio Reloj, Pereira (ris) ID Radio Reloj en Colombia 9198 km

This section displays the status of my logged USA & Canada states. It will be updated.







List of abbreviations for states

Pin board at Google Maps

Status 17 January 2019

Heard states/green (USA): 27
Confirmed states/red: 0
Latest heard or confirmed: 1000 KOMO, Seattle, Washington

Heard states/green (Canada): 5
Confirmed states/red: 1
Latest heard or confirmed:

Map source: Free Software Foundation. The source has been changed.

Azimuthal Map
Center: 50°35'1"N 8°40'40"E
Courtesy of Tom (NS6T)



QTH: D-35390 Giessen/Germany

All 50 m Antennas are connected through a RPA-2 Preamplifier.
I am working on a 250°/ 70° direction.

On 24.10.2018 at 1624z I managed the reception of 5AN, ABC Adelaide on the frequency 891 kHz. The weak signal could only be identified with the help of the webstream. The 50 kW transmitter from the state of South Australia is my first Pacific broadcast on medium wave.

Actually, everything was not a problem. The components were assembled, the elements assembled, the wire roll positioned in a bicycle trailer, and we went out to the neighboring meadow. There, first the earth piles with the connection components were cut into the dry soil, then the galvanized 300 m cable was towed from point A (NE) to B (SE), the 80 m long coax was laid out to the hut, and the RPA- 2 connected. The first test showed remarkably good signals over the entire medium wave, no additional amplified noise due to the preamplifier, in short: the perfect antenna for receiving from the NE direction. A two-hour recording showed me later, how good 300 m antenna cable can be.

I sat in my garden hut in front of the waterfall screen and listened intently, likening the reception to the now weak K9AY, it was around 1930z when I heard voices unknown from outside. When they did not stop, I left my seat, walked to the shack, and watched a person slam through the blackberry hedge. I would not want to go through that, I said. Police, was the answer. In the light of the flashlight I could see the lettering on the man's jacket. In fact, I said.

Displaced dog owners carrying their Fiffies on the meadow suspect a power cord, the policeman said, while his companion expertly examined the coaxial cable. It's an antenna, I confirmed, and that's guaranteed no electricity in it. Good - the law did not come to the dicuting. Now the identity card was checked, a radio check was made, and then I was allowed to roll up the quickly mounted antenna again. So that the dog owners can perform their Fiffies again the next morning. We'll check that later, they said before I let them out through the official entrance to the garden. No, we do not want to go through that again, they said, and disappeared in the darkness of the night.

Days later, I realized that the preferred direction of arrival from NE was not guaranteed at all, because one earth point was in the wrong position. So it is not even a pity that the experiment did not work out. It was exciting enough, from planning to firing.

40 safe meters remain me, NE 4-5 m pulled over the impenetrable blackberry hedge, soon. After all, it's my garden, and I do not keep dogs.

Antenna building material for a 350 m BOG. The line should run in NE / N direction, be largely invisible, and waterproof. Most of the material comes from a pasture fence shop, secret slogan: "Your partner for good MW-DX". The antenna is placed as soon as conditions permit on the neighboring meadow.

For construction: The Beverage boxes are installed in watertight HT tubes, the cables are routed through watertight cable feedthroughs. The ground wires at both ends are bolted to the ground rods. An approximately 60 m long coaxial cable is laid underground to the shack. If necessary, the ring insulators are placed in the ground at long intervals, bolted to wooden bars to keep the BOG flat and tight.

The BOG is connected to an RPA-2 Modular Receive Preamplifier by DX-Engineering.