Category Archives: NADX

Excellent NA/LA MF Conditions

After several months of poor conditions this morning saw some excellent signal strengths from both North American and Latin American stations. A new one for me was HJLI Radio Libertad from Bogota Colombia on 1520 kHz:

I was astounded to read in the February 2014 issue of Radio User magazine that the editor states in 50 years of trying he has yet to hear a North American MF station on medium wave. I am speechless – he lives near the south coast of England. Does he not known how to erect a flag antenna or even point a loop antenna at 300 degrees? Even in last few months when conditions have been poor 1010, 1130, 1390 and 1510 kHz have all been audible here in London virtually every night and early morning.

I really think he should be reflecting on whether he is the right person to edit a national radio listening magazine….

Return of North American MF DX

After the poor conditions week before last and start of last week NA DX came back towards the end of the week.  Nothing spectacular but some reasonable signal strengths from the East Coast regulars. Morning of Friday 11 October saw the New York stations coming through with above average strength. Video below shows how WINS 1010, WBBR 1130 and WLIB 1190 were sounding in London.

 

 

 

 

X-Band in Carcassonne

Conditions have been very poor for the last week or so despite some F2 noted on 10m and US repeaters on 10m FM  being audible in the late afternoons. Just before the the sun erupted again and disturbed MF conditions started I recorded the X-Band as heard in our rural dx location outside Carcassonne. The video shows how quiet it was with audio from 1640 WTNI Biloxi MS, 1670 WPLA Dry Branch GA, 1630 KCJJ Iowa City IA and 1620 Radio Rebelde Cuba. 

Receiver is Perseus SDR with 300m BOG (Beverage on Ground).  Conditions went rapidly downwards the following nights with nothing of interest making it through.

Power of the Flag

For a new MF dxer getting your first TA station is a big achievement. Replacing the usual long wire with a Flag antenna will almost guarantee that you will receive TA stations during the season.

This is a short example of how directional the Flag Antenna is:

The video shows the power of the Flag Antenna . The Perseus SDR is on 1368 KHz and you can hear BBC Wiltshire which is to the west of my location. Flag is orientated north west at 300 degrees. Then I switch in an Inverted L antenna which has traps for the amateur 80 and 160 band – antenna runs west to east – on MW it operates essentially  like a long wire. Wiltshire disappears and you can hear BBC Surrey which is to my South, I switch between the Flag and Long Wire, and Wiltshire and Surrey come and go. Thanks to David H in Scotland for introducing me to the Flag antenna.

The Flag is a piece of wire – arranged in a rectangle – mine is 10m x 3m. So 26m of wire all together. In the middle of one short end break the wire and insert a balun. I am using the FLG 100 balun/pre-map from Wellbrook. I have also used a balun supplied by eBay seller kafa2500. He is in Canada and is good guy. The feedline to receiver attaches to balun. The other short side break the wire and attach either a resistor around 900 Ohms or a variable resistor – again I use one from kafa2500. The short side with the balun is the direction from which signals are strongest and you tune the variable resistor to null out stations 180 degrees away. With ground wave nulls are very deep – obviously sky wave propagation nulls are variable. However I do a good job of nulling the Dutch station on 1008 to allow 1010 through (Spain is also on 1008).  My Flag is beaming around 300 degrees – towards New York.

Here is link with more info on Flag antennas http://www.hard-core-dx.com/nordicdx/antenna/loop/flag/index.html

Here’s an eBay link where you can buy baluns/resistors: http://cgi.ebay.co.uk/Flag-Pennant-Diamond-Ant-Kit-50ohm-SO-239-connector-/320476300212?pt=LH_DefaultDomain_0&hash=item4a9de043b4 Worthwhile to look at all the items he has for sale.