![]() ![]() Selectivity -57 db 136 Mhz -43 db 156 Mhz The manufacturer's literature says, "The filter's design is four helical resonators with aperature coupling." N connectors are optional. 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. ![]()
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