I removed the filter and checked again to see if I was seeing the dummy load swr, and received the same response. The supplied swr plot for the filter shows an essentially flat response through the band (~1.07:1). As advertized, the swr dropped rapidly from >31 (the maximum the MFJ analyzer displays) very near 144 mhz and rolled around between 1 and 1.3:1 until just above 148 mhz, it zoomed back up again. Not confident enough to put it on the packet station and walk away (thinking I might leave the 30 watt amp working into an open circuit) I put the filter on a dummy load first, and hooked up an swr analyzer to it. The metal work is nice to look at but I worried that in shipping, something inside may have come loose. Mine arrived seemingly undamaged with UHF connectors. All are rated at 200 watts and come with attenuation plots. Also, today's FM rigs have wide front ends-mine was suffering from a paging system and the filter was cheaper than another rig.īesides custom filters, DCI makes a variety of filters for 2 m. I figured a band pass filter would keep my end of things clean.

yagi lower down with a bit higher power, I worried about the data transmissions getting into nearby TVs and FM broadcast receivers. I could have solved the problem by putting up an antenna about 50 feet high (I'm in a river valley) but I get antsy above 30 or 40 feet because of the risk of lightning strikes. I run a packet station to a dx cluster about 25 miles away and I was having trouble connecting. I purchased the DCI-146-4H 2 meter band pass filter about 4 months ago from AES. I'm trying to avoid ratings inflation (giving everything a 5) but in this case if it isn't a 5 it's real close as in 4.7.

146 mhz bandpass filter 1 mhz