VA6AM Projects

HAM Radio Projects for Contesting and More


October 27, 2022All prices for all parts used to build filters were increased this year, especially doorknob capacitors. Doorknob capacitors supply was from Russia and Ukraine and now, I only can buy them from Ukraine. Filters are an expensive addition to the contest station and I will try to keep all prices as low as I can.

July 11, 2022It’s been 6 years since High Power  Triplexer and BPFs  projects has been started. Stats for these years and hundreds of filters built tells that HP filters can be reliable  and serve their purpose very well. 

March 10, 2022.  Low Power Triplexer the first build was in 2013. It was 9 years ago and with hundreds of units built no single failure reported yet. It is still the best one by all numbers.

May 5, 2020 I have more and more people asking questions about Stacked Tribander setup and decided to share some general ideas about such a setup. Please, read this page about Stacked Tribanders and how Triplexers , StackMatches and BPFs can be installed together. 

May 30, 2019Low Power Bandpass filters for all 10-15-20-40-80-160 bands built. Each filter is available as a completed unit or as a kit.

April 20, 2019The first Low Band High Power Triplexer for 40-80-160 meter bands completed for power up to 1500W PEP.   

February 14, 2019The first 160M High Power Band-Pass filter completed with Insertion Loss below -0.2dB and Attenuation close to -60dB. 

December 23, 2018New Low Power 4, 5 or 6 Band Antenna Filter System built with a Split Diplexer and high level of band isolation for all 10-15-20-40-80-160 meter bands. (Please, find a low power unit section at the bottom of the page.)

November 5, 2018New High Power 4-Band Antenna Filter System built with a high level of band isolation for all 10-15-20-40 meter bands.

August 29, 2018New High Power 40M BPF built using T200-2 Iron Powder cores for coupling coils. A great result of -82dB of isolation level achieved for 20M band. Insertion Loss is below -0.3dB with a good VSWR below 1.1. The best HP filter you can have!

July 12, 2018It’s been 2 years since I’ve started building HP Triplexer and BPFs and 5 years since my Low Power Triplexer project has been started. No single triplexer and BPFs failure has been reported during the normal usage.

May 12, 2018.  Please, listen to an Audio file  how the most difficult 10 and 20 meter bands could sound (with Triplexer, BPFs and 100W output power) . OR2F and ON5RA  (worked as OT70OSB) during their test of WRTC-2018 equipment. You can find this audio file on this page as well.

January 20, 2018.   20M Low Power 200W BPF completed in a Hammond 1411MU (6″ x 3″ x 3″) enclosure. It is better than – 0.3dB of Insertion Loss, band attenuation is better than -60dB with VSWR below 1.1.

November 4, 2017.  160M High Power LPF completed in a Hammond 1411ZU (17″ x 5″ x 4″) enclosure. It is better than -0.1dB of Insertion Loss, band attenuation is better than -65dB with VSWR below 1.1.

October 12, 2017.  40, 80 meter BPFs and 160M LPF completed in a Hammond 1444-1773 (17″ x 7″ x 3″) enclosure. Now, all band’s BPFs/LPF can be built in two different enclosure types, optimized for a wall installation or to be used as a “box tower”.

October 1, 2017.  The first 160M High Power LPF completed in a Hammond 1444-1773 (17″ x 7″ x 3″) enclosure. It is better than -65dB of isolation for 80 and 40 meter bands.

May 31, 2017.  The first antenna switch I’ve ever found with 50 Ohm loads on every port is available from It is at least -71dB of isolation on 28MHz and better for other bands.

May 20, 2017.  First High Power 3000 watt 40/80 meter Diplexer completed. 

May 12, 2017.  First Triplexer with BPFs  set 1500W (2000W PEP) completed. 

Mar 15, 2017.  Low Power Triplexer in a new 1411RU / 1411UU enclosure completed.

Feb 1, 2017.   I started moving my old website to this new one.

Thank you for your interest!