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Buck wrote:
I know I'll be corrected if I am wrong, but if I am correct, the SWR is high (actually varies by band) on the feedline for the G5RV. The twin lead portion doesn't have the losses the coax does with that SWR so more of the signal gets to the antenna than it would if it were just coax going to a twenty meter dipole. Here are the 50 ohm SWRs at the 300 ohm twinlead to 50 ohm coax junction that EZNEC produced in 2001 for a 102' dipole at 40 feet fed with 27.7' of 300 ohm ladder-line. 3.8 MHz 3.2:1, 7.2 MHz 3.6:1, 10.125 MHz 56:1, 14.2 MHz 4.1 18.14 MHz 37:1, 21.3 MHz 11:1, 24.95 MHz 7.6:1, 28.4 MHz 66:1 The G5RV was designed for 80m, 40m, & 20m operation and on those designed-for bands does a reasonable job. It works pretty well on 12m. Less well on 15m. Terrible for 30m, 17m, and 10m operation. However, if you are willing to vary the length of the 300 ohm (or 450 ohm) matching section, you can achieve a reasonable match on any HF band. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
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