Category Archives: Technical

Dedicated SDR for League Members

Another benefit of belonging to the NZRDXL is use of a 4-channel KiwiSDR receiver located in an excellent receive location at Russell in the Bay of Islands.

Map credit: www.takepa.com

The League established the SDR to provide members an opportunity to be able to hear signals otherwise buried in noise and interference at their home locations. These days, the DXer’s home environment is much noisier electrically than it was 20 years ago and for many the enthusiasm to DX was curbed by this problem. The advent of SDRs and widespread availability of an internet connection has made DXing from a very quiet location with a good antenna possible from your armchair, sitting in  a vehicle with your smart phone and in your traditional place of DXing, the radio shack.

FM DX Antenna & Tuner

I decided to try a bit of FM DX after a break of more than 20 years and
needed a new antenna.

First I tried a 7 element log periodic yagi, similar to this example but found the local FMers about 3km away swamped the whole band pretty much. So then I re-built the antenna into one of these combo yagis  which is a hybrid log periodic yagi and standard yagi, sometimes called a “logyag”.

It handles the signals from the locals much better than the straight LPY
and seems to be more directional. Mine is made from old low-band TV
antennas so only cost me some hardware and time.

Noise – A Problem Even 80 Years Ago

Noise.

Noise. (Photo credit: Wikipedia)

This interesting article forwarded from Bill Marsh was penned 80 years ago. In all that time, noise from electrical and electronic devices has grown even worse.

 

A Ferrite Shielded Loop – Kiwi Style

fsl3

Bill Marsh has been experimenting with the ferrite sleeved loop design and has come up with a clever design. You can read the full article here.

Coax Loop Revision

Bill Marsh has been experimenting further with his coax loop for MW and the X-band. Here are the results:

X-BAND LOOP NUMBER 2

Rockwork Cliff DXpedition

garydebock

Gary DeBock with an FSL at Rockwork.

Washington state DXer Gary DeBock (above) who recently joined the  League has posted this report of a DXpedition to his favourite cliff-side location on the northern Oregon coast last month. Thanks to Paul Rawdon for reporting this to the DX Dialog user-group.

X-Band Coax Loop

xloop1Bill Marsh Jnr. has recently completed his X-band coaxial loop antenna (tunes 550-1700kHz). The full article appears here.