Tag: Bandpass Filters

5B4AGN bandpass filters – The measurements

5B4AGN Bandpass filter performance measurements

I’ve been moving some boxes around recently and I unpacked the bandpass filters I built for one of the Martello Tower Group DXpeditions and successfully used again during our activation of the MV Ross Revenge in August 2016. It struck me that I’d never produced a full set of figures showing rejection on each band, insertion […]

Building a set of 5B4AGN bandpass filters

For the Martello Tower DXpedition to Herm, I borrowed two complete switchable 5B4AGN bandpass filters, we had one connected to each radio to prevent the two stations interfering with each other and they worked very well.  I’d decided before we went to Herm that I wanted to build a set of these filters myself and […]