DDAMTEK filters
Home Page Up DDAMTEK filters Digital TV Spectra MMDVM Repeater Levels Using DSD+ 1.09 GHz filters 145 MHz pagers


VHF filters - response measurements

I've measured a few DDAMTEK filters and an RTL-SDR FM-stop filter.

DDAMTEK filters

These three DDAMTEK filters were measured with my DG8SAQ Vector Network Analyser (VNWA) on 2012-Oct-19.  The VNWA was first calibrated to 0.01 - 200 MHz, but I make no claims for the accuracy of these measurements.

BPF-AIR: 112 - 140 MHz bandpass filter

BPF-VHF: 137 - 174 MHz bandpass filter

HPN-30118: 30 MHz high-pass and 87 - 108 MHz notch filter


RTL-SDR.com 88-108 MHz bandstop filter

Click for details






Copyright © David Taylor, Edinburgh   Last modified: 2017 Oct 17 at 12:37