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#1
August 19th 17, 03:35 PM
posted to uk.radio.amateur,rec.radio.amateur.dx
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[S&DWS] Foundation Course Material in PDF Format
"Ian Jackson" wrote in message ... In message , Gareth's Downstairs Computer writes On 19/08/2017 10:34, Jimbo wrote: sexes). when I was newly licensed and poor I used 75 ohm TV coax and belling lee connectors on HF and got away with it ....... And it was standard on 145MHz. (QQV03-10 anyone?) Actually, the original B&L connector is a pretty good 75 ohm match up to 1GHz and more. If I remember correctly, many 50 ohm BNCs are not so hot 500MHz. With 75 ohms, the problem is maintaining the structural return loss constant while having enough PTFE insulation to hold the pin in place. Some are only really good to around 200Mhz. Of course, for most purposes, both are usable to much higher frequencies. And mixable! I got a load of weird connectors and adaptors from a guy that worked at the sub base at New London in 1979 ...still using them ...... |
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#2
August 19th 17, 04:23 PM
posted to uk.radio.amateur,rec.radio.amateur.dx
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[S&DWS] Foundation Course Material in PDF Format
On Sat, 19 Aug 2017 15:35:41 +0100, "Jimbo"
wrote: "Ian Jackson" wrote in message ... In message , Gareth's Downstairs Computer writes On 19/08/2017 10:34, Jimbo wrote: sexes). when I was newly licensed and poor I used 75 ohm TV coax and belling lee connectors on HF and got away with it ....... And it was standard on 145MHz. (QQV03-10 anyone?) Actually, the original B&L connector is a pretty good 75 ohm match up to 1GHz and more. If I remember correctly, many 50 ohm BNCs are not so hot 500MHz. With 75 ohms, the problem is maintaining the structural return loss constant while having enough PTFE insulation to hold the pin in place. Some are only really good to around 200Mhz. Of course, for most purposes, both are usable to much higher frequencies. And mixable! I got a load of weird connectors and adaptors from a guy that worked at the sub base at New London in 1979 ...still using them ...... Type 43 connector? |
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#3
August 19th 17, 04:53 PM
posted to uk.radio.amateur,rec.radio.amateur.dx
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[S&DWS] Foundation Course Material in PDF Format
"Rambo" wrote in message ... On Sat, 19 Aug 2017 15:35:41 +0100, "Jimbo" wrote: "Ian Jackson" wrote in message ... In message , Gareth's Downstairs Computer writes On 19/08/2017 10:34, Jimbo wrote: sexes). when I was newly licensed and poor I used 75 ohm TV coax and belling lee connectors on HF and got away with it ....... And it was standard on 145MHz. (QQV03-10 anyone?) Actually, the original B&L connector is a pretty good 75 ohm match up to 1GHz and more. If I remember correctly, many 50 ohm BNCs are not so hot 500MHz. With 75 ohms, the problem is maintaining the structural return loss constant while having enough PTFE insulation to hold the pin in place. Some are only really good to around 200Mhz. Of course, for most purposes, both are usable to much higher frequencies. And mixable! I got a load of weird connectors and adaptors from a guy that worked at the sub base at New London in 1979 ...still using them ...... Type 43 connector? no idea ... oh was that a submarine joke? .... |
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#4
August 19th 17, 07:11 PM
posted to uk.radio.amateur,rec.radio.amateur.dx
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[S&DWS] Foundation Course Material in PDF Format
On Sat, 19 Aug 2017 16:53:49 +0100, "Jimbo"
wrote: "Rambo" wrote in message .. . On Sat, 19 Aug 2017 15:35:41 +0100, "Jimbo" wrote: "Ian Jackson" wrote in message ... In message , Gareth's Downstairs Computer writes On 19/08/2017 10:34, Jimbo wrote: sexes). when I was newly licensed and poor I used 75 ohm TV coax and belling lee connectors on HF and got away with it ....... And it was standard on 145MHz. (QQV03-10 anyone?) Actually, the original B&L connector is a pretty good 75 ohm match up to 1GHz and more. If I remember correctly, many 50 ohm BNCs are not so hot 500MHz. With 75 ohms, the problem is maintaining the structural return loss constant while having enough PTFE insulation to hold the pin in place. Some are only really good to around 200Mhz. Of course, for most purposes, both are usable to much higher frequencies. And mixable! I got a load of weird connectors and adaptors from a guy that worked at the sub base at New London in 1979 ...still using them ...... Type 43 connector? no idea ... oh was that a submarine joke? .... No it's a coax connector http://www.servicepower.co.uk/catego...43-connectors/ |
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#5
August 19th 17, 08:33 PM
posted to uk.radio.amateur,rec.radio.amateur.dx
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[S&DWS] Foundation Course Material in PDF Format
"Rambo" wrote in message ... On Sat, 19 Aug 2017 16:53:49 +0100, "Jimbo" wrote: "Rambo" wrote in message . .. On Sat, 19 Aug 2017 15:35:41 +0100, "Jimbo" wrote: "Ian Jackson" wrote in message ... In message , Gareth's Downstairs Computer writes On 19/08/2017 10:34, Jimbo wrote: sexes). when I was newly licensed and poor I used 75 ohm TV coax and belling lee connectors on HF and got away with it ....... And it was standard on 145MHz. (QQV03-10 anyone?) Actually, the original B&L connector is a pretty good 75 ohm match up to 1GHz and more. If I remember correctly, many 50 ohm BNCs are not so hot 500MHz. With 75 ohms, the problem is maintaining the structural return loss constant while having enough PTFE insulation to hold the pin in place. Some are only really good to around 200Mhz. Of course, for most purposes, both are usable to much higher frequencies. And mixable! I got a load of weird connectors and adaptors from a guy that worked at the sub base at New London in 1979 ...still using them ...... Type 43 connector? no idea ... oh was that a submarine joke? .... No it's a coax connector http://www.servicepower.co.uk/catego...43-connectors/ no don't think I have any of those ...... |
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#6
August 20th 17, 10:22 PM
posted to uk.radio.amateur,rec.radio.amateur.dx
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[S&DWS] Foundation Course Material in PDF Format
On Sat, 19 Aug 2017 20:33:52 +0100, "Jimbo"
wrote: "Rambo" wrote in message .. . On Sat, 19 Aug 2017 16:53:49 +0100, "Jimbo" wrote: "Rambo" wrote in message ... On Sat, 19 Aug 2017 15:35:41 +0100, "Jimbo" wrote: "Ian Jackson" wrote in message ... In message , Gareth's Downstairs Computer writes On 19/08/2017 10:34, Jimbo wrote: sexes). when I was newly licensed and poor I used 75 ohm TV coax and belling lee connectors on HF and got away with it ....... And it was standard on 145MHz. (QQV03-10 anyone?) Actually, the original B&L connector is a pretty good 75 ohm match up to 1GHz and more. If I remember correctly, many 50 ohm BNCs are not so hot 500MHz. With 75 ohms, the problem is maintaining the structural return loss constant while having enough PTFE insulation to hold the pin in place. Some are only really good to around 200Mhz. Of course, for most purposes, both are usable to much higher frequencies. And mixable! I got a load of weird connectors and adaptors from a guy that worked at the sub base at New London in 1979 ...still using them ...... Type 43 connector? no idea ... oh was that a submarine joke? .... No it's a coax connector http://www.servicepower.co.uk/catego...43-connectors/ no don't think I have any of those ...... I've seen too bloody many !!!! |
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