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On Feb 28, 9:18 am, DVoeltz wrote:
I'm new to this and need your help in selecting which antennas to use on my railroad motorcars. The radio will be moved between two pieces of equipment. One cab has a flat metal roof and the other has a fiberglass cab. I would like an antenna that I can unscrew from the cab when traveling the equipment down the road on a trailer. The radio will be using the NARCOA licensed frequency of 151.625 MHz. I understand that this frequency is in what is known as the VHF-High Land Mobile Radio (LMR) Service band, and uses a modulation known as narrow band (5 kHz deviation) FM. I will be using a Vertex FLT 2011 40 Watt radio. Based on the little I know about this, I understand a special antenna will be needed for the fiberglass cab since there is no ground plane. Both antenna will be mounted directly to the roof through a hole. The radio will be mount within 2 feet of where this hole will be drilled so I only need a short wire to connect from the antenna to the back of the radio. If you can offer me suggestions as to which antennas to use, I would be most appreciative. Please excuse me if I misused some of the language of the hobby. Thanks in advance. Dave in Pierre, SD To see pictures of what this equipment is, go to: www.narcoa.org Hi, Dave. Sure looks like fun! Someone here in Redmond, Oregon has one of the cars. Seen it parked on a truck and then on the ground in front of his garage. The antenna you want to use will in a large part depend on what distance and over what terrain you need to communicate. If only a few miles, then a simple ground plane antenna will work. The antenna will add less than 18 inches to the height of the roof, so you may not need to remove it for transport. I am not familiar with the class of license you are operating under, so will not comment on antenna brands or installation. This seems to be a commercial type installation, rather than an amateur radio installation, so a licensed installer may be needed. If so, they will have the antenna information you need. Best regards, Paul, KD7HB |
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