CW ‘Plan B’ (CAT) for 7QNL
For my planned DXpedition to Malawi (7QNL, May/June 2014) I made an Artisan (Win)Keyer to be used in conjunction with N1MM-logger. This contrapsion works very well (at home/on the bench). However, when...
View ArticleBeverage transformers for 7QNL
To fight very likely QRN in Africa for 80, 40 and 30m (open) Beverages are envisaged. Targeted length is 2λ @80m. I plan to roll out four (open) Beverages to obtain 8 ‘directions’. A Beverage antenna...
View ArticleRemote Beverage antenna switch for 7QNL
In the previous post I elaborated on the design of Beverage transformers. When using several Beverages ‘out in the field’, sometimes several hundreds of meters away, they have to be switched inside the...
View ArticleDutch CQWW 160m record Single Op
One picture says it all (click on image to enlarge in a new tab)
View ArticleEl Cheapo AFSK (e.g. RTTY) USB interface (for FT-8×7)
Being licensed for >27 years, my first steps into RTTY were during my 7QNL DXpedition in Malawi in May/June 2014. According to ClubLog ‘digital’ modes from Malawi were (relatively) scarce, so I was...
View Article145 MHz / 2m Moxon (pt. 2)
More than one year ago I published my interpretation of a 145 MHz / 2m Moxon for ARDF / fox hunting purposes. The main advantages of a Moxon over a HB9CV while foxhunting are its smaller dimensions and...
View ArticleNoise/interference enduring UTC DCF77 clock
Warning: This is a long post. So fetch a coffee, beer or nice glass of wine ; -) For a long time I want a UTC clock locked to DCF77 as a separate unit with six 7-segment LED displays. Why? Perhaps...
View ArticleFolded counterpoise (FCP) experiment on 40m
A priori: please read the whole (long) post because my context and experimental boundary conditions are explained. Shortcut: the NEC input file of the experimental 40m FCP vertical is here. Antennas...
View ArticleFolded counterpoise (FCP) experiment on 40m (2)
In my previous post I tried to elaborate on the ‘magical properties’ of the folded counterpoise (FCP). My first conclusion is/was there is no such thing as ‘current cancellation’ in a counterpoise....
View ArticleJunkbox 30m WSPR receiver
Introduction. WSPR (pronounced as ‘whisper’) stands for Weak Signal Propagation Report and is invented by Nobel laureate Joe Taylor K1JT. WSPR algorithms are able to look ca. 30 dB deep into the noise....
View ArticleExperimental 30m QRSS grabber
A priori. When operational, my experimental 30m QRSS grabber can be seen here. (<– click to open in new tab) Introduction. The receiver from my previous post can be used for other weak signal modes...
View ArticleExperimental 30m QRSS grabber (2)
A priori: when operational, my 30m grabber can be seen here (<- click to open in a new tab) Introduction. I decided to write a new post, otherwise the previous posts become too long, knowing that...
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