I run the WEB SDR IO group which is primarily aimed at WEB SDR admin's and owners with the aim of sharing experiences and technical expertise relating to operation and running of WEB SDR's
I also operate a number of public KiWi and other WEB SDR's, which cover various ranges of frequencies, which are located in the South West of the UK.
0-30MHz - Very good performance and low noise floor, probably one of the best in the world.
0-65MHz - Very good performance and low noise floor, which also covers the VHF Low bands
OpenWebRX with a mixture of VHF and UHF Bands
0-30MHz - Very good performance and low noise floor, at another site in the South West UK
0-30MHz - Currently using a temporary antenna and its performance is not too good, however it can be useful for monitoring the VLF bands
Unfortunately our popular SW, VHF, UHF & Microwave WEB SDR at Farnham had to close down due to a change of site ownership.
Most of this has now been reactivated at the other sites.
Active Antennas - Updated Nov 2022
Loop on the Ground Receive Antenna - First draught added June 2021
Broadband Receive Loop Inductance - Updated Jan 2023
Mobeus Receive Loop Antenna - First draught added June 2021
Balun Loss & Experimental method of measurement - First draught added June 2021
Broadband Vertical antennas Comet CHA-250B & Diamond BB6W & BB7V
G8JNJ Broadband HF Vertical Antenna - Requires no tuner
1m HF loop antenna - Uses a novel tuning capacitor - RADCOM antennas column Sept / Oct 2010
G8JNJ ‘Fat-Max ® ’ HF Antenna - 6m to 40m - the poor man's Steppir
HF Variable Pitch Helical antennas DG7PE & Chameleon V1
Loft and Attic antennas for restricted places
G7FEK Multiband compact garden antenna
M3KXZ no-counterpoise antenna - Does it actually work ?
Slinky antennas - Compact antennas made from Slinky toys are likely to be poor performers
Solarcon / Antron A99 - How well does it work on other bands ?
Portable Vee Dipole - Uses fishing poles and a lighting tripod
Broadband Terminated Vee antenna - A travelling wave antenna using 9:1 Ununs & a 50 ohm terminating load
Rotary Washing line antenna - Various antennas using hardware from scrap rotary washing lines
Washing line wire reel antenna - A cheap portable antenna
Low Band Wire Antennas - Which is the best ?
HF Antenna Switches - Remotely select a Doublet, Tee or Vertical - for use with a 100w tranceiver
Multiband Wire HF antennas - Thoughts on the G5RV and similar designs
Better than a G5RV - the ZS6BK / G0GSV multiband HF antenna - External site
More information relating to ZS6BK antenna and matching section - External site
Problems with broadband transformers using Iron Powder Cores - why Ferrite cores give better results
6:1 Unun construction - Similar to Comet CHA 250 matching unit with less loss
Using Auto-Tuners - Some general information, Hints & Tips
General notes on Balun performance when used with tuners - plus construction details
Design for remote antenna switch for use with ZS6BK antenna
FM on the LF Bands - How much spectrum does a Narrow Band FM transmission occupy
SSB TX audio equaliser - Published in Radcom February and March 2009
Build an audio Processor and clipper
Boom microphone for Yaesu FT-857 / FT-897 & Icom IC-7000 - modify a cheap PC headset
Modifying Clansman Military Headsets - use with Yaesu FT-857 FT-897 Icom IC-7000
FT-897D - Audio processing and ALC operation
QO-100 Satellite terminal - First draught added June 2021
Software Defined Radio & RTL Dongle modifications
Directional Coupler made from spliced coax
Plessey PRC 320 Power supply fault finding
EMC & Amateur Radio - Updated February 2017 to include VDSL information
Switched Mode Power Supply - Why A CE mark Does not Guarantee a Quiet Power Supply for Amateur Radio use
FT-897D S Meter calibration chart
Amateur TV - Analogue satellite receiver modifications
All other miscellaneous projects can be found by clicking on this page link
Including:-
- Manhattan or 'New Amsterdam' Style construction
- 40m Antenna Shootout
- Switched X dipole / Vee Beam
- Christmas Light - Vertical Antenna
Other items have now been moved to separate pages
