Article archive
HOW I SEE DEVELOPMENT OF RADIOAMATEURING NOWADAYS
20/02/2024 14:50
I must say at the beginning that I am already old and a little conservative.
Because of that fact my opinion on the HAM’s development is not positive (as you could read on this WAB many times).
1)
I see that my old HAM overseas friends are already died or seriously ill (unfortunately) and...
OK1DN's HAM Shack
01/12/2023 10:43
TS-480 HX output 200W (SW),
Alinco DR - 138 output 60 W (VHF),
Antenna Tuner MFJ - 949E,
Power Supplier Diamond G7000 (13.8 V, 50 A)
Something out of HAM information II
28/01/2023 17:51
My long time animal friend Aghaya died at her age of 16 years today. Thank you Aghaya for everything and R.I.P.
You can see some pictures of her life in the Photogallery.
Receiving Ferrite Rod Antenna in Czech Language
11/10/2022 19:25
Pro příjem DX stanic v nízkých krátkovlnných pásmech se, jak známo, používají antény typu Beverage, případně různé otočné směrové systémy a pod. Vysílací antény mají také, jak známo, většinou vertikální vyzařovací polarizaci. To ovšem není z hlediska příjmu optimální (zvýšené rušení atmosférou,...
Ferrite Rod Antenna for receiving on 3.5 MHz band
14/07/2022 09:27
I have been using magnetic receiving antennas for a long time - Frame and Ferrite Rod Antennas. These antennas receive magnetic part (H) of electro – magnetic radio waves (as it is well known). My last article (work) will be published in OQI 121 (magazine of Czech QRP Club). It is also important...
Something out of HAM Information
31/12/2021 16:11
It’s about my long time animal friend Aghaya (you could see her on my Photogallery
– a member of our family, because of that I must use she / not it). My little dog – female one had her 15th birthday yesterday (December 30th, 2021). She is really an old lady (about 78 human years)....
Sporadic E layer
07/05/2021 16:52
Fundamental information of sporadic E layer (Es) came many years ago (in the 1970’s of the last century). Topical Critical frequency (and MUF) is possible to obtain from near Ionospheric Observation (via Internet). The height of Es is about 100 km over the Earth surface.
There are two...
Usage a Vertical Delta Loop Antenna (loop has 83 meters) for 50 MHz band
12/02/2021 12:49
I tried to use my Delta Loop antenna 83 meters long for 50 MHz band. According to MININEC program it could work relatively good there to lots of directors. There was only one problem with an impedance matching between my TRX and the antenna. My SW MFJ Antenna Tuner because does not work on 50 MHz....
New Equipment of OK1DN
05/08/2020 20:14
Because of the fact that I was not able to obtain a needed pair of bipolar transistors (PP100 or 2SC2879) for my PA ALS500M(XCE) (the world situation is not too good nowadays of course) I decided for following solution. I bought a new small TRX (with 200W CW output power) TS-480HX from...
OL90 activity - my result
30/05/2020 13:11
I operated two OL90 stations/callsignes – OL901AA and OL90CRK on 14MHz band in CW mode. I started on May 19th 2020 and finished on May 29th 2020. As OL901AA I made 588 QSOs and as OL90CRK I made 1635 QSOs with 67 countries of DXCC. Propagation conditions ware not too good and I had only 100W power...
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