At 8/10/2009 10:21, you wrote: >Hi Dcflu7x, > >It's a DB products SP-1894. Can't get any info on it from >anywhere. > >Each of the 8 cans have the approx dimensions of 5" x 21". >A single screw-type shaft in the center, and one SO-239 >sticking out of the top of the can. No variable caps, or >anything else on the cans. Each can has an RG-9 jumper >between each 'T'. The male portion of the 'T' screws down >into the can. > >The 4 cans on the 147.7 side are strictly 4 cans in series. >The 4 cans on the 147.1 side also have an additional 'T' >between cans, and from that dangles a short stub.
This sounds like a modified DB-4050. I don't understand why one side of the duplexer would have additional Ts. The specs on the DB-4050 are: notches -95 dB, passes -2.2 dB. Sounds close to what you're getting. >The stubs actually pull up the high side of the notch. Without >them, the cans exhibit high loss at 600khz above the notch. >With them, the total loss is about 2 - 2.5dB. Bob NO6B
