If the installation will be outdoors, especially where salt spray is possible, such as the seaside or the bottom of a road vehicle, TNC or Type N would be a better choice, according to what an Amphenol applications engineer told me when I ran into trouble. That causes corrosion of the coax braid, and high RF losses. The BNC family has an interfacial seal, but I learned the hard way that the coupling mechanism can rock laterally and let water leak in past the gasket. The former type can develop an inductive discontinuity at UHF, or if it backs out far enough, an open circuit. There are two basic constructions of MIL-spec BNCs: the older ones in which the axial location of the center pin is determined only by the center conductor of the coax, and the newer captivated-contact types in which the contact is accurately positioned between a pair of dielectric parts. The impedance is pretty flat up to 1 GHz, at least for well-made MIL-spec versions. However, there are a lot of BNC product families, whose characteristics, capabilities, and general quality vary greatly. It’s a more complicated issue than either/or.įor QRP, BNC is certainly adequate from an electrical standpoint. (Of course, any cables that are up over the ground, or any guy lines, should be marked with flagging tape - available from any hardware store - to prevent someone from tripping.) This can be an annoyance if you lose your connection when someone trips over the cable, or it can be a feature in that the antenna won’t get pulled over when someone trips over the cable RCA connectors are inexpensive but can become unplugged. The commercial version of the Buddipole uses them. Wikipedia has a side-by-side picture comparing the two types. My picture above seems to be of the 50 Ω type. What I didn’t realize until recently is that they come in both 75 Ω and 50 Ω types. ![]() RF cables with BNC connectors seem to be more available. Maybe you can help me out: Which is the “best” (most common, most useful, works best) for a QRP Antenna Connector: BNC (which stands for “Bayonet Neill-Concelman” according to Wikipedia ) or RCA “phono” connectors (they were used for connecting a turntable to an audio amplifier for something like a half a century)? 50 Ω Female BNC Connectors (Photo by W1AKI)īNC connectors cost more but won’t come loose. Music Direct does not guarantee delivery within that specified time period.Which is best for QRP Antenna Connectors: BNC or RCA? I’ve seen both on the web, so I’m trying to decide which connector to use for a QRP antenna. Average ground delivery time ranges from 7-14 business days. The ground shipping method used will be determined at Music Direct's discretion. Please Note: Orders that are less than $125 are not guaranteed to ship via FedEx. Orders will be held to ship all back ordered items together when they are all received in stock. Music Direct will not charge additional shipping for any back orders items. Music Direct will contact you with shipping charges for these addresses.Ĭustomers can choose an alternative expedited shipping method but it will not qualify for this free shipping offer. This offer is not included on any shipments to FPO/APO addresses. Music Direct reserves the right to change the terms of this promotion or discontinue this offer at any time. Music Direct reserves the right to select the carrier and ship method within the terms of this offer. This offer cannot be applied to previously placed orders. This offer also excludes Oppo, demos, closeouts/sale items and freight shipped items. **Orders must be at least $49, before tax, to qualify. ![]() *Ground shipping to the 48 contiguous states only (FPO/APO excluded). If you continue to see a shipping charge on your order, please check the exclusions listed below. ![]() When your order subtotal reaches $49 in the shopping cart the shipping charge for associated qualifying items will automatically be adjusted on your order. ![]() Place a qualifying order over $49* and receive FREE DOMESTIC GROUND SHIPPING.
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