- #Bnc vs f connector serial#
- #Bnc vs f connector full#
- #Bnc vs f connector license#
- #Bnc vs f connector free#
The list of signals included handshaking signals such as DTR and DSR, flow control signals (RTS and CTS), an out-of-band ring indicator that was useful for modems, and (of course) the actual data signals themselves, as well as two grounds.
#Bnc vs f connector serial#
RS232 specifies a number of out of band control signals as well, which were highly useful when devices of varying capabilities, often with limited memory, processing power, or other resources, needed to reliably interoperate with flow control and the need to avoid dropped characters.Īs it turns out, there were nine signals specified within the DB9 serial standard, including a ground. Of course people can adapt an RS-232 connector to include a power connection, but then it doesn't fully meet the RS-232 specification. In fact there is no power pin in the RS-232 specification.
We only use 4 wires (pwr, common, and two data)
(Figure above also courtesy of Dallas Semiconductor Application Note 83, Fundamentals of RS–232 Serial Communications) See the Wikipedia article on the D-subminiature connectors for more details.) The 2nd letter is the size of the connector shell, and this smaller connector is size "E", whereas the larger 25-pin connector is size "B" other sizes exist too. The first letter, D, refers to the D-shaped connector's metal shell. (Strictly, it's a D E-9 connector, not a D B-9. All 9 pins have a defined function, whether you use that function or not.
#Bnc vs f connector full#
It's a similar explanation for the 9-pin connector made popular by its use on the original IBM PC/AT (the earlier PC and PC/XT used the full 25-pin RS-232 connector). Why do we use a DB9 connector for serial com? (Figure above courtesy of Dallas Semiconductor Application Note 83, Fundamentals of RS–232 Serial Communications) This diagram is a brief overview of the pinout of the 25-pin connector: There are lots of features of RS-232 which are little used these days! So there you go - just a bit of an insight into the bizarre mindset here at =] People find it strange when I recommend other antennas for some purposes or when I don’t seem concerned about losing their business - but I don’t need to make a ton of money with this, I just need enough to keep funding for our other efforts going.Assuming you mean the standard 25-pin connector, then there is a simple answer: The RS-232 specification states the defined function for every one of the 25 pins bar three. I realize that’s going to frustrate some people, but it would work directly counter to our goals - I’d have to spend more time designing and building antennas and less time building. Now, in order to properly support those endeavors we do need to provide good service for our antennas they need to work well, they need to be worth purchasing, and we need to make sure we show the same level of commitment to our antenna users that we have to our other users… but does it actually make sense to make custom antennas for a specific country? No, not really.
#Bnc vs f connector free#
We sell great antennas because we need a way to fund our real endeavors - you don’t make a lot of money running free resources with minimal ad revenue, and we’re not interested in compromising the usefulness of our websites by peppering them with obnoxious ads.
#Bnc vs f connector license#
Signal Stuff is dedicated to improving the state of license examination and study in the US - we do that primarily with the websites and. Sure, we make good antennas, and yes we will continue to make good antennas and we will support them, etc etc… but we aren’t an antenna company. Well, if you want to understand what a company does you need to understand why they do it thus, if you want to know how likely we are to do something you first need to understand that Signal Stuff is not an antenna company. We’ve often seen these called “Reverse SMA” which is semi-accurate since historically most ham radios with an SMA antenna required SMA-Male on the antenna, but it is far too easily confused with RP-SMA and we recommend strongly against using the terminology.Ī radio with an SMA-Male connector on it requires a SMA-Female antenna. It is worth noting that this is not the same connector as a Reverse Polarity SMA, often abbreviated RP-SMA that has the pin and socket switched from standard and will not fit your radio. There are also some Motorola and Kenwood radios that we know of which require SMA-F antennas, and there may be others that we are unaware of.
There are a lot of debates as to how good those radios are but most of them require antennas with an SMA-Female connector. SMA-Female connectors were very rarely seen on antennas until the last few years (2014 or so) when many Chinese manufacturers began manufacturing inexpensive radios capable of operating on amateur radio frequencies.
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