Hi Joe, There should not be a problem using RF Coax for audio in many fairly short length examples. One RG-174 coax data sheet I just looked at on the web states a 100pf per meter C value. In this case certainly not enough C to get excited about.
RG174 and many other small diameter coaxial lines are quite lossy to RF, especially above the VHF low band. So except for very short runs I don't even like to use it much except for space restricted requirements. I should put more pictures of the completed repeater in the folder. One might note the transmitter to external RF Amplifier cable is small diameter coax, but not RG174. I have some surplus high quality brown Teflon type 50 ohm coax so a section, which included a pre-mounted BNC connector was used. And of course there is no part number on the side of the mini Teflon coax to tell you what it is. Maybe someone else here on the group has the Teflon RG-174 coax equivalent part number handy. The hardest part of interfacing to the Hamtronics transmitter was finding a one-piece RF rated RCA connector. They seemed to have gone poof from the US Market... nay with Digi Key, Mouser, and similar sources. Some coax types also work fairly well for high voltage lead. I and many others have used the center conductor of non-foam RG-8 type/size coax for RF Amplifier high voltage lead for many decades. cheers, skipp > Joe <k1ike_m...@...> wrote: > This brings up an interesting question. I have always used > small diameter coax for my audio leads, as I have a lot of > it around. I remember a discussion about "audio wire" in > the past. Is there any problem with using coax for audio? > Capacitance, maybe? I've always had this question in the > back of my mind. > 73, Joe, Kike > > > skipp025 wrote: > > A shielded audio quality wire is routed out of the receiver > > box to the transmitter board at the proper CTCSS connection > > point.
