OK1RR DX & Contesting Page

Ham Radio web site dedicated to CW DX operating and contesting

Notes on call/QRP

Many well respected operators offered their opinions on call/QRP. It is considered sometimes as trying to gain unfair advantage, sometimes as deliberate altering of an official callsign but the majority considered it as counter-productive practice hurting both the user and his QSO partner. There is a significant number of high-profile DXpeditioners and contesters avoiding working, logging and QSLing call/QRP users.

Cornwall GK

GK callsigns – Cornwall, UK

Earlier this year, representatives of some radio amateurs in Cornwall, UK approached Ofcom (The UK government dept regulating the radio spectrum) to request temporary use of the Regional Secondary Locator “K” for Kernow, the Cornish word for Cornwall, following the recognition of the Cornish People under the Framework Convention on National Minorities. Ofcom has agreed

Coaxial Cables

Coaxial Cable Power Ratings Maximum input power rating – Watts at (MHz) RG/U CABLE 1.0 10 50 100 200 400 900 1000 3000 5000 55, 6A, 212 4000 1500 800 550 360 250   150 65 50 8 MINI, 8X 4000 1500 800 550 360 250   150 65 50 8, 8A, 10A, 213 11000
Collins Mechanical Filter

Farewell Collins Mechanical Filters

FILTERED OUT FOREVER For many radio amateurs, it’s the end of an era: Rockwell Collins, which designed and manufactured mechanical filters for more than two generations of hams, has discontinued the filters’ production. The company posted on its website: “Over the past several years, we have seen a dramatic reduction in demand for narrowband analog

TRMASTER Database

Here is the latest version of the TRMASTER file for TR Log (N6TR), TR log linux port (W9CF) and TR4W (N4AF). It contains the complete FOC list, CWops list and HSC list as well as many calls frequently appearing in CW events. TRMASTER.ASC source is included. =N name =F FOC =U CWops (should be used
Debouncer in WX7G style

A Debouncer for Semiautomatic Speed Keys in WX7G style

Like many others, I have noticed an ugly, scratchy sound while using my Vibroplex Presentation bug. The unwanted artifact is affected by the contact setting but it is impossible to remove this completely. This problem is noticeable mostly with new “fast” transceivers like K3. My idea that this sound is caused by contact bouncing was

Coaxial Cable attenuation

10 mm dia Coaxial Cable attenuation   Aircom Plus RG 213 U H 2000  Flex Ecoflex 10 Ecoflex 10+ H 2010  MHz  dB/100 m  dB/100 m  dB/100 m  dB/100 m  dB/100 m  dB/100 m 5    0,9        0,8    0,9      7        1,0        0,97  10    1,2    1,8      1,2    1,3    1,20