AmateurRadio.com

10' x 20' LF Loop

As is usually the case, conditions deteriorated rapidly as the CLE weekend approached. Conditions varied throughout North America as those listening from the south-eastern regions of the U.S. reported much better propagation than those further to the northwest. Friday night appeared to be the best of the lot but all three nights were very much less than stellar.

The three-night event produced a total of 39 NDBs, with a couple of surprises.






DD UTC    kHz     Call       mi   Location
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22 05:00  370     YBV        1169 Berens River Apt, MB, CAN
22 06:59  370     OUN        1611 UoOk Westheimer Apt, OK, USA
22 05:00  371     YK         211  Yakima, WA, USA
23 09:00  371     PUR        1629 Marshall, MO, USA
22 05:00  371     ITU        558  Great Falls, MT, USA
22 05:00  371     GW         1946 Kuujjuarapik, QC, CAN
22 05:00  372     ZPA        824  Prince Albert, SK, CAN
22 05:00  372     YCO        1340 Coppermine, NU, CAN
22 05:12  372     FPN        675  Petersburg, ALS
22 07:00  373     TF         1191 Pueblo Mem Apt, CO, USA
22 05:00  373     MF         444  Table Rock, OR, USA
22 05:00  374     LV         776  Livermore, CA, USA
22 05:00  374     EX         190  Kelowna, BC, CAN
23 09:00  374     EE         1319 Forada, MN, USA
22 05:00  374     BOD        942  Bowman, ND, USA
24 09:59  375     PSN        1854 Palestine, TX, USA
22 05:00  375     FS         896  Fort Simpson, NT, CAN
22 10:59  375     DW         1629 Owasso, OK, USA
22 07:00  375     CP         900  Casper, WY, USA
22 05:00  375     BD         803  Moose Jaw, SK, CAN
22 07:00  376     ZIN        3326 Matthew Town, BAH
22 07:00  376     YAG        1345 Fort Frances, ON, CAN
22 13:59  376     PVQ        1690 Deadhorse, ALS
22 06:59  377     EHA        1350 Elkhart, KS, USA
23 06:59  378     ZFA        1000 Faro Municipal Apt, YT, CAN
22 05:00  378     OT         381  North Bend, OR, USA
22 10:59  379     ZEG        526  Edmonton Intl, AB, CAN
22 05:00  379     YBE        945  Uranium City, SK, CAN
23 12:59  379     IWW        1360 Kenai, ALS
22 09:00  380     OEL        1297 Oakley, KS, USA
22 05:00  380     GC         899  Gillette, WY, USA
22 05:00  382     YPW        86   Powell River, BC, CAN
22 05:00  382     YE         686  Fort Nelson, BC, CAN
22 12:59  382     JNR        1731 Unalakleet, ALS
22 12:00  382     GRN        1522 Guerro Negro, MEX
22 05:00  382     AW         75   Marysville, WA, USA
22 06:59  383     PI         658  Pocatello, ID, USA
22 05:20  383     CNP        1146 Chappell, NE, USA
22 05:00  384     3F         792  Ile-a-la-crosse, SK, CAN
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This particular frequency range (370-384.9kHz) is a tough one for me, since my local pest signal, 'AP' is on 378kHz, smack in the middle of the listening range. 'AP's antenna is just .4 miles (2100') from my antenna and its signal is about 60db over S9.... Very loud!

AP to me...Courtesy: https://www.google.ca/maps/

The new 10' x 20' rotatable loop continues to work well. When pointed towards the east, it offers significant nulling of AP's signal and when carefully aligned to the deepest null-point, reduces the signal by almost 30db...but still leaves a very strong signal.

Using this 'deep null' position, I was (somewhat surprisingly) able to log another Canadian NDB (ZFA  Mayo Airprt, Yukon Territory) on the same frequency as AP. The ident-tone modulation frequencies are separated by 10Hz (408Hz vs 418Hz) which was enough to allow the very narrow ~3Hz Perseus filtering, combined with two notch filters, to reveal the 'ZFA' identifier between the 'AP' identifier. Listen for the weak 'ZFA' ident after the loud keying artifacts of 'AP', when they are transmitting just a steady tone.



The other surprise was the logging of 'PVQ' in Deadhorse, Alaska, way up on the extreme northern slope oil fields.

Courtesy: https://www.google.ca/maps/

My last reception of this beacon was in March and conditions usually have to be very quiet, geomagnetically, to hear it at all. The coronal-hole streaming of this past weekend, putting the damper on LF propagation, makes this path very unlikely and surprising! See if you can hear the weak 'PVQ' identifier during its short appearance early on Saturday morning:


CLE organizer, Brian Keyte (G3SIA), reports 51 participants worldwide and over 2100 reception reports. All reports have been added to the RNA/REU beacon database.

As well, Brian will be publishing all results on the NDB Information page shortly.

All-in-all CLE188 was another enjoyable event....hopefully conditions will be better by this time next month and if you did not participate, maybe you will give it a try next time!