mtwieg
Advanced Member level 6
I want to put a circuit (64MHz T/R switch + receiver LNA) in a generic aluminum box (something like this http://www.hammondmfg.com/pdf/1550D.pdf), but I'm hung up on what kind of connectors to use such that they don't screw up my 50Ω matching (especially on the antenna/coil port and the amplifier output port). I've been looking at several varieties of both panel mount and board mount BNC connectors, but am unsure how I should use them in my enclosure.
Here are a few types I have sitting around in the lab:
Digi-Key - A97552-ND (Manufacturer - 1-1337542-0) (seems nice, but takes up a huge amount of space on the PCB... are the PC pins actually a 50 ohm line?)
Digi-Key - A32341-ND (Manufacturer - 5227726-3) (I could just squish the PCB between the two contacts, but I still bet I would get standing waves. I also have these with a conducting body)
Digi-Key - ACX1049-ND (Manufacturer - 112290) (looks nice, but the PCB is going to be floating in the middle of the enclosure, only connecting to the enclosure at connectors. So again I have doubts as to whether having the connector shield connected directly to the enclosure, rather than directly to the PCB, is a good idea).
Thoughts/recommendations?
Here are a few types I have sitting around in the lab:
Digi-Key - A97552-ND (Manufacturer - 1-1337542-0) (seems nice, but takes up a huge amount of space on the PCB... are the PC pins actually a 50 ohm line?)
Digi-Key - A32341-ND (Manufacturer - 5227726-3) (I could just squish the PCB between the two contacts, but I still bet I would get standing waves. I also have these with a conducting body)
Digi-Key - ACX1049-ND (Manufacturer - 112290) (looks nice, but the PCB is going to be floating in the middle of the enclosure, only connecting to the enclosure at connectors. So again I have doubts as to whether having the connector shield connected directly to the enclosure, rather than directly to the PCB, is a good idea).
Thoughts/recommendations?