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Measuring co-ax cable loss(Post)
A friend contacted me yesterday. He was having some problems with his portable 2m set-up and wanted to get the feeder assembly checked. He wondered if the cable had degraded over many wet hilltop ...
5 Most Popular HF Portable Antennas(Post)I carried out a survey in early 2014 to try to discover which portable HF antenna was most popular. Just over 300 people responded. They were asked to choose their "favourite portable antenna" fro ...
Baluns Explained(Post)First published in the SOTABEAMS Newsletter 30 March 2018. If you like this article, why not sign up to our newsletter? It comes out about monthly.Baluns explainedThe word balun is shorthand for a ba ...
Are antenna tuners always lossy?(Post)First published in the SOTABEAMS Newsletter 26 July 2016. If you like this article, why not sign up to our newsletter? It comes out about monthly.A few thoughts on Antenna TunersWhen the subject ...
Using two sychronised WSPRlites and DXplorer to measure a known power difference(Post)Today, April 23rd 2017. I carried out a similar experiment to yesterday but with WSPRlite G33CWI reduced in power by 3dB compared the WSPRlite G31CWI. 57 simultaneous S/ ...
Test Equipment for the Shack(Post)Peak Electronics make a range of very clever hand held test equipment. We recently bought their LCR45 automatic inductance, capacitance and resistance meter for use in our factory. I was so impres ...
Strength Rating System for Telescopic Fibreglass Masts(Post)People often ask me how mast X compares with mast Y in terms of strength and flexibility. It's hard to be objective but in an attempt to do so, I have developed a simple rating system.The SOTABEAMS M ...
Alex Loop Measurements(Post)The Alex Loop is a popular commercial small transmitting loop antenna.Measurements here are simply an aide-memoire for my own experiments. They should be used with caution.Loop conductor Datalin ...
Chameleon P-Loop Measurements(Post)The Chameleon P-Loop is a popular commercial small transmitting loop antenna. I have bought two to use for propagation experiments using two WSPRlite antenna test systems. Th ...
How try a mag loop before you buy a mag loop...(Post)Small transmitting loop antennas "magnetic loops" have become very popular. There is no doubt that they can provide good performance for their small size. While they are easy to build if you have (or ...
Bias-T for LNB - a few notes(Post)A bias-T is required to feed DC and control signals to a satellite TV LNB. This allows the co-axial cable that transports the signals down from the dish, to be used to power and control the LNB. The ...
Taxes(Page)The 'inc tax' prices on our website include UK tax (VAT, 20%). Customers with a shipping address outside of the UK will not be charged this tax - prices should update to the ex-tax ones after enterin ...