Try this link instead:
https://www.dxengineering.com/parts/hsr-6btv 73 Lyn, W0LEN -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of John K9UWA Sent: Wednesday, April 01, 2020 9:01 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] 75ohm Impedance question K3S and Antenna side. Supposedly the feedpoint impedance is 52 ohms ??? Yes, I question that a bit. Read all about it here. Sorry I doubled the 1/2 wave mults. https://www.dxengineering.com/search/department/antennas/section/hf-vertical -a ntennas/brand/hustler-antenna/product-line/hustle Hustler Antenna 6BTV - Hustler 6BTV 6-Band HF Vertical Antenna and DXE Installation Guide Packages Antenna, Vertical, HF, 6-Band, 80, 40, 30, 20, 15, 10 meters, 1.5 kW, 24 ft., + DXE BTV High Perf. Guide, Each $241.99 Performance provided by the Hustler 6BTVs is better than any other antenna of this type. Broad-banding is such that one measurement and setting permits both phone and CW operation. The antenna provides nominal 52-ohm base impedance when installed and tuned according to the instructions. The radiation efficiency is equal to, or greater than, other trap verticals. 73 John k9uwa On 1 Apr 2020 at 8:14, Bob McGraw K4TAX wrote: > Based on TLW calculations for 1/2" CATV 75 ohm hard line, 200 ft at 28 > MHz should show a 1.87:1 SWR at the transmitter. Assuming 35 ohms load > Z. This equates to 1.027 dB total loss with 0.207 dB being attributed > to the SWR on the line. Thus going through the efforts and matching > process would only net an improvement of 0.207 dB on 10 meters. Lower > frequencies would be less. > > Since this is a 5 or 6 band antenna, I doubt the Z at the feed point > will always be 35 ohms. In order to determine what is actually needed, > one would need measurements for each band. > > Conclusion: Feed it with 200 ft of 1/2" CATV 75 ohm hard line, use a > short jumper of RG6, or 8X or whatever to connect the hardline to the > radio and be done with it. > > > NOTE: I just noticed that the numbers below are somewhat in error. > > 468/3.540 = 132.2 which is 1/2 wavelength. Thus 132.2 X 2 = 264 ft > which is 1 wavelength, not 2 wavelengths as stated. I didn't run the > math on the others. > > 73 > > Bob, K4TAX > > > On 4/1/2020 7:28 AM, John K9UWA wrote: > > Ah YES I noticed it is for a multi band antenna. > > > > 2 wavelengths 3540 = 265' > > 4 wavelengths 7080 = 265' > > 6 wavelengths 10600 = 265' > > 8 wavelengths 14160 = 265' > > 12 wavelngths 21240 = 265' > > 16 wavelengths 28320 = 265' > > > > Multiply the 265' by velocity factor of the coax and you will be someplace > > just a bit over 200 feet. > > > > the 10mhz band is off a bit. So OK... other than that 80, 40, 20, 15,10 are > > all harmonically related. As I said 50 in and 50 out. If the OP runs this > > vertical on 17 and 12m then yes he will have maybe a 1.5 / 1 mismatch caused > > by the coax. But the antenna isn't designed for 17 and 12. > > > > I cut all the 3/4" CATV in my system with a Hewlett Packard HP 4815A Vector > > Impedance Meter. Any 1/2 wave mult the the SWR is the same in as out. Any ODD > > 1/4 wavelength multiple creates a transformation With Multiple 4 hi stacks of > > yagi's I have many of those in the system as well. 75 ohm cable works well to > > put pairs or quads of yagi's together. > > > > The only thing that maybe won't be perfect is the actual vertical itself may > > not be a 50 ohm input. His vertical is a Hustler 6BTV. 73 John k9uwa > > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to j...@johnjeanantiqueradio.com John Goller, K9UWA & Jean Goller, N9PXF Antique Radio Restorations k9...@arrl.net Visit our Web Site at: http://www.JohnJeanAntiqueRadio.com 4836 Ranch Road Leo, IN 46765 USA 1-260-637-6426 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to l...@lnainc.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
