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uBIT and antenna connector and Nextion 7"

Rich #60093 So I just got my uBITX last week, and am looking at the antenna connector. Now, I am VERY new to all this, so be kind.? I would like to keep all my gear standardised from this point on.? Now I appreciate that BNC and SO239 are commonly used, however, is there any advantage to one over the other?? I have a load of chassis mount SMA connectors... any reason to not use these? I have been looking at ? Is that the right one (spending the extra quids on getting the enhanced version)??
N5KBP #60096 Purest will tell you that the BNC is superior to the SO239 but at HF it's not that big a deal. Use whatever you have. The SMA's will do fine. I use the SO239 simply because all my jumpers on my HF antenna system are PL259's. -- N5KBP
N5KBP #60097 Oh yea. That Nextion will do fine if you use Rich Neese's? TFT or Hmi's -- N5KBP
Jerry Gaffke All Messages By This Member #60098 SMA's are ideal, use one of those if you have them. Good to several ghz. Not that impedance control matters much at HF, as evidenced by the the lack of coax between antenna connector and uBitx main board. Many qrp rigs use RCA phono plug connectors, designed for audio, not impedance controlled. The machining on some of the BNC's provided with the uBitx kit is not up to par, the pin of the mating BNC connector on your cable may not make sufficient contact.? No, this is not a 50 vs 75 ohm connector issue, the provided connectors are 50 ohms. And 75 ohm BNC connectors would mate just fine with 50 ohm BNC connectors anyway. Some ham gear manufacturer decided to use SO239's back about 1930, and it became the standard. Since it's the standard, nobody can sell a commercial medium or high power transceiver these days without an SO239 on it, or they'd be deluged with calls asking how to hook it up to the PL259 on the antenna cable that's been coming in through the window these last 90 years. But at HF frequencies, could use just about any connector that ohms out ok.? Jerry toggle quoted message Show quoted text On Sat, Sep 29, 2018 at 03:12 PM, N5KBP wrote: Purest will tell you that the BNC is superior to the SO239 but at HF it's not that big a deal. Use whatever you have. The SMA's will do fine. I use the SO239 simply because all my jumpers on my HF antenna system are PL259's.
Lee All Messages By This Member #60100 I went with BNC because that's what is on the end of my buddy-pole coax. -- Lee - N9LO? "I Void Warranties" ?
Rich #60104 That's perfect thank you. I'm not going into the 50 Vs 75 ohm debate other than to say that I am using 75 cable with an impedance transformer on my current rig. Works exceptionally well with an SWR of 1.2 on a home brew slim Jim on 2m. I get 75 ohm cable for free before anyone starts accusing lol. That's possibly not going to work with HF variance of wavelengths, so I'm either going to have to pay for cable or come up with something else ?
Dexter N Muir All Messages By This Member #60107 Different co-ax only matters if it's part of the radiating antenna. Feedline (e.g. to tuner or other matching network) not so much. Once the antenna gets close enough to resistive at whichever value, it matters little. If you have co-ax coming out your ears, it's handy as part of a dipole - broadens the resonant range. 73 de ZL2DEX
Rich #60108 I work in the satellite TV industry in the UK, so yeah... Coax is definitely not an issue.?
Tom, wb6b All Messages By This Member #60109 I'm beginning to like SMA cables and connectors more and more. For my short cable runs such as from transceiver to tuner or dummy load I use short SMA cables and SMA to BNC, SO239/PL259 and F connector adaptors. It is a great way to hook just about anything to anything. For things I build, I now mostly use SMA. I'm thinking about replacing the two pin antenna connector on the uBITX board with an SMA. Although for the short length from the board to the current BNC connector, the individual wires twisted together is probably just fine.? I live at a resort town and before I made a trip down the mountain and bought some 50 ohm coax cables, I used 75 ohm (supposedly high grade) coax cable available at the hardware store. It seemed to work well, but I was making an adaptor by splicing the 75 ohm coax to a SMA cable (before I received the SMA to F adaptors) and found the 75 ohm coax cable has aluminum wire for the shield braid. The center conductor may be copper clad steel. None-the-less it did work. For significantly higher power transceivers the power handling capacity of the TV 75 ohm coax (and the SMA cables) would be an issue. Tom, wb6b
Rich #60112 WF65 is also the same physical size as CLF200, so thank you for that.? I have an abundance of gear to do pretty much anything then. Perfect. Now just to wait for the screen and mic connector to arrive.. oh and finish off building my new 3d printer for the enclosure lol
Lawrence Galea All Messages By This Member #60113 75Ω cable will work well at HF. toggle quoted message Show quoted text On Sun, Sep 30, 2018 at 10:04 AM Rich <admin@...> wrote: That's perfect thank you. I'm not going into the 50 Vs 75 ohm debate other than to say that I am using 75 cable with an impedance transformer on my current rig. Works exceptionally well with an SWR of 1.2 on a home brew slim Jim on 2m. I get 75 ohm cable for free before anyone starts accusing lol. That's possibly not going to work with HF variance of wavelengths, so I'm either going to have to pay for cable or come up with something else ?
Bill Cromwell All Messages By This Member #60114 Hi Tom, On a 160 meter mail list there are hams who report using RG6 - 75 ohm TV cable - on that band in their DXing station at full legal power of 1500 watts (and maybe a little more) without issues. Just go ahead and use whatever you have. This if HF, not microwaves. 73, Bill KU8H toggle quoted message Show quoted text On 09/30/2018 04:59 AM, Tom, wb6b wrote: I'm beginning to like SMA cables and connectors more and more. For my short cable runs such as from transceiver to tuner or dummy load I use short SMA cables and SMA to BNC, SO239/PL259 and F connector adaptors. It is a great way to hook just about anything to anything. For things I build, I now mostly use SMA. I'm thinking about replacing the two pin antenna connector on the uBITX board with an SMA. Although for the short length from the board to the current BNC connector, the individual wires twisted together is probably just fine. I live at a resort town and before I made a trip down the mountain and bought some 50 ohm coax cables, I used 75 ohm (supposedly high grade) coax cable available at the hardware store. It seemed to work well, but I was making an adaptor by splicing the 75 ohm coax to a SMA cable (before I received the SMA to F adaptors) and found the 75 ohm coax cable has aluminum wire for the shield braid. The center conductor may be copper clad steel. None-the-less it did work. For significantly higher power transceivers the power handling capacity of the TV 75 ohm coax (and the SMA cables) would be an issue. Tom, wb6b -- bark less - wag more
Gary Anderson All Messages By This Member #60124 Rich, Before you go to the work of designing and building your case, consider the pros/cons of using a larger and stronger mechanical connector for how you see yourself using your uBITX and the size of the coax you will be wanting to attach to it. Since the UHF connector has been the defacto standard in HF/VHF for so many years, there are many inexpensive screw on adapters. If you chose a UHF SO239 connector for your uBITX, you have a solid mechanical solution to screw on an adapter to BNC, SMA, type F (for your surplus Sat TV coax). etc.? Compromise, but flexible/adaptable.? The cost of type N connectors and adapters is also coming down so this may work for your situation too. Again, just another viewpoint to consider. Rgds, Gary
Rich #60126 This one is going to be base station at home and won't be moving.? I've already got plans for another one to go mobile :P
iz oos All Messages By This Member #60142 As my local store offers good BNC at a reasonable price I opted to use BNC connectors for all RF homebrew stuff. They have the clear advantage of quick plugging in as opposed other connectors, SMA, N, PL. They are just more convenient. When I use a tuner I tune with an antenna analyzer and plugging-unplugging BNCs is fast.They are easier to assemble too and a good choice up to microwave. toggle quoted message Show quoted text Il 30/set/2018 21:05, "Rich" <admin@...> ha scritto: This one is going to be base station at home and won't be moving.? I've already got plans for another one to go mobile :P

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