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#71
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Coax recomendations
Reg Edwards wrote:
To find ALL electrical characteristics and performance of solid-polyethylene transmission line, use program COAXPAIR, from audio frequencies to UHF. Accuracy is of the same order as physical dimensions can be measured. Use a micrometer to measure inner conductor diameter and diameter over insulant. Or just guess at it. No need to unwind the cable off the drum! In a few seconds, download COAXPAIR from website below and run immediately. Have you compared the results to any measurements of real cables? Roy Lewallen, W7EL |
#72
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Coax recomendations
Reg Edwards wrote: To find ALL electrical characteristics and performance of solid-polyethylene transmission line, use program COAXPAIR, from audio frequencies to UHF. Accuracy is of the same order as physical dimensions can be measured. ============================================ Have you compared the results to any measurements of real cables? Roy Lewallen, W7EL ============================================ Yes, Roy. Countless times. Have you any more questions? ---- Reg, G4FGQ |
#73
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Coax recomendations
Reg Edwards wrote:
Reg Edwards wrote: To find ALL electrical characteristics and performance of solid-polyethylene transmission line, use program COAXPAIR, from audio frequencies to UHF. Accuracy is of the same order as physical dimensions can be measured. ============================================ Have you compared the results to any measurements of real cables? Roy Lewallen, W7EL ============================================ Yes, Roy. Countless times. Have you any more questions? ---- Reg, G4FGQ Yes. Where can I buy some of that RG-58 that has only 2.2 dB/100 foot loss, or RG-213 that has only 0.89 dB loss, at 50 MHz? Roy Lewallen, W7EL |
#74
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Coax recomendations
On Tue, 13 Dec 2005 00:26:25 -0800, Roy Lewallen
wrote: Have you compared the results to any measurements of real cables? Roy Lewallen, W7EL ============================================ Yes, Roy. Countless times. Have you any more questions? ---- Reg, G4FGQ Yes. Where can I buy some of that RG-58 that has only 2.2 dB/100 foot loss, or RG-213 that has only 0.89 dB loss, at 50 MHz? Roy Lewallen, W7EL The silence is deafening. Danny, K6MHE email: k6mheatarrldotnet http://www.k6mhe.com/ |
#75
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Coax recomendations
Howdy:
I was wondering if, for a long run, instead of running coax for vhf or uhf, if you could have your radio up by the antenna, then run some large, but cheep wire to the head unit on say a ic-208? Would there be too much loss in D.C., or is there any other problems that I don't know about that would make this a really stupid idea, such as some kind of timing delay problem? -- SeeYaa Harbin Osteen KG6URO !sdohtem noitpyrcne devorppa-tnemnrevog troppus I - |
#76
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Coax recomendations
Harbin Osteen wrote:
Howdy: I was wondering if, for a long run, instead of running coax for vhf or uhf, if you could have your radio up by the antenna, then run some large, but cheep wire to the head unit on say a ic-208? Would there be too much loss in D.C., or is there any other problems that I don't know about that would make this a really stupid idea, such as some kind of timing delay problem? Locating an amplifier at the antenna is a fairly common practice both for transmitting and/or receiving. -- 73, Cecil http://www.qsl.net/w5dxp |
#77
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Coax recomendations
Remoting radios is nothing new and quite do-able. Signal line loss
problems depend on the design of the remoting. ie if line drivers are used, not a problem. If high Z TTL lines then you might have a problem. Power supply will be a problem. It may be smart to also remote a large battery for current peaks. Easy to work out... You may wish to address other issues though like lightning strikes and weather ingress.. I use to remote a linear amp and preamp with a remote NiCd pack of D cells. Worked well. RFO was about 70W on 144MHz. Open wire feeder may also be an option to you.. The line loss would be lower. You could also make some out of small dia copper pipe and spacers you size/drill yourself. Cheers Bob VK2YQA Harbin Osteen wrote: Howdy: I was wondering if, for a long run, instead of running coax for vhf or uhf, if you could |
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