Re: Topband: Topband Digest, Vol 144, Issue 34
Ed - NI6S question about using his 106-foot high tower === Message: 1 Date: Wed, 24 Dec 2014 10:29:24 -0800 From: Ed via Topband To: "topband@contesting.com" Subject: Topband: 160m Sloping Vertical Antenna? Message-ID: Content-Type: text/plain; charset=us-ascii Trying to figure out how to best utilize my 106' tower for 160m. The tower sits on a small hill so the downside of the tower is sloping. If I hang a wire off the top, I can bring the other end to the ground and feed it at the bottom. I can ran numerous radials from there. This arrangement can accommodate a quarter wave length. The angle of the tower would be about 20 degrees. Any objections to this plan? Open to other ideas. Thanks in advance and happy holidays! Ed NI6S == Ed - You could just Shunt-feed the tower and install lots of radials to get on 160. I examined a model I'll call the "Four" (due to its shape when viewed with the feed-point to the left looking into the plane of the wires) for your situation and came up with the following: Connect a 136-foot piece of #12 copper wire from an insulator spaced about a foot away from the tower-top and route it to a post 10-feet high 96 feet away from the base of the tower to one end of an insulator. Connect another 136-foot length of #12 Copper wire to the opposite end of the lower insulator and run the wire back toward the tower (missing the tower) and tie-off at 10-feet high. Feed the antenna from the junction of the H-wire and sloping-wire. EZNEC5 calculates : Peak Gain ~ -1.6dBi at 25-degrees Z_feed should be around 11-Ohms so you will have to do some matching to get 50-Ohms. I modeled the tower as a grounded 8-inch diameter wire 106 feet tall Looks like a reasonable experiment you can try among the others suggested to you. Good luck . . . de Dick/w7wkr CN97uj and wd2xsh-26 at CN98pi On Thu, Dec 25, 2014 at 9:00 AM, wrote: > Send Topband mailing list submissions to > topband@contesting.com > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.contesting.com/mailman/listinfo/topband > or, via email, send a message with subject or body 'help' to > topband-requ...@contesting.com > > You can reach the person managing the list at > topband-ow...@contesting.com > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Topband digest..." > > > Today's Topics: > >1. 160m Sloping Vertical Antenna? (Ed via Topband) >2. Re: 160m Sloping Vertical Antenna? (Jim Brown) >3. Re: 160m Sloping Vertical Antenna? (James Wolf) >4. Re: 160m Sloping Vertical Antenna? (Jorge Diez CX6VM) >5. Re: 160m Sloping Vertical Antenna? (Jim Brown) >6. Re: 160m Sloping Vertical Antenna? (Art Roberts - W5AER) >7. Re: 160m Sloping Vertical Antenna? (Richard (Rick) Karlquist) >8. Re: 160m Sloping Vertical Antenna? (Paul Elliott) >9. Re: 160m Sloping Vertical Antenna? (Dave Hollander) > 10. Re: 160m Sloping Vertical Antenna? (Tom W8JI) > 11. Re: 160m Sloping Vertical Antenna? (Charlie Cunningham) > > > -- > > Message: 1 > Date: Wed, 24 Dec 2014 10:29:24 -0800 > From: Ed via Topband > To: "topband@contesting.com" > Subject: Topband: 160m Sloping Vertical Antenna? > Message-ID: > Content-Type: text/plain; charset=us-ascii > > Trying to figure out how to best utilize my 106' tower for 160m. The > tower sits on a small hill so the downside of the tower is sloping. If I > hang a wire off the top, I can bring the other end to the ground and feed > it at the bottom. I can ran numerous radials from there. > > This arrangement can accommodate a quarter wave length. The angle of the > tower would be about 20 degrees. > > Any objections to this plan? Open to other ideas. > > Thanks in advance and happy holidays! > > Ed NI6S > > -- > > Message: 2 > Date: Wed, 24 Dec 2014 10:46:20 -0800 > From: Jim Brown > To: topband@contesting.com > Subject: Re: Topband: 160m Sloping Vertical Antenna? > Message-ID: <549b09fc.7030...@audiosystemsgroup.com> > Content-Type: text/plain; charset=windows-1252; format=flowed > > On Wed,12/24/2014 10:29 AM, Ed via Topband wrote: > > Trying to figure out how to best utilize my 106' tower for 160m. The > tower sits on a small hill so the downside of the tower is sloping. If I > hang a wire off the top, I can bring the other end to the ground and feed > it at the bottom. I can ran numerous radials from there. > > That's exactly what I'm doing -- my tower is 115 ft with roughly 7 ft of > mast above it and a 3-el SteppIR. I have sloping wires on two opposite > sides, supported from the tower just below the rotator with a 10 ft > section of 4-in PVC conduit. Each wire has its own set of 4 radials > elevated about 18 ft. The tower, which is grounded, has a doz
Re: Topband: Power line networking RFI
That's what I thought. "...some importers don't care ...". I think this might be something that the FCC would go after, if it was reported with full details; make & model, QTH, audio recordings, etc. I was not aware of this until I ran across that eHam post. 73, Mike www.w0btu.com On Thu, Dec 25, 2014 at 2:04 PM, [private msg] wrote: > Mike, > > It IS BPL on your house wiring. Recent regulations, at least here in > Europe, requires the ham bands to be slotted out. It has, however, been > around for many years now, so many of them > don't have this feature and some importers don't care until they are > caught. > _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: Power line networking RFI
Has anyone heard of RFI from computer LANs that use the house wiring in lieu of either CAT5 cable or 2.4 GHz WiFi? It sounds to me like BPL (Broadband over Power Lines) on a smaller scale. It also sounds like trouble, especially if you have a close neighbor with one of these pieces of junk. >From www.eham.net/ehamforum/smf/index.php?topic=100375.0 : "Also I could not use Hamradio when I had the Powerline adapters plugged in. It gave me much interference on many different ham HF frequencies." Just what we need, yet another source of broadband RFI to keep us from hearing DX on 160. :-( 73, Mike www.w0btu.com _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: 160m Sloping Vertical Antenna?
Multi-path was my thought as well! Merry Christmas! 73, Charlie, K4OTV -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI Sent: Thursday, December 25, 2014 11:02 AM To: Richard (Rick) Karlquist; Art Roberts - W5AER; topband@contesting.com Subject: Re: Topband: 160m Sloping Vertical Antenna? More likely it was a mix of groundwave and sky wave, if the station was local, cancelling or reinforcing signal as phase shifted on the sky wave path. - Original Message - From: "Richard (Rick) Karlquist" To: "Art Roberts - W5AER" ; Sent: Wednesday, December 24, 2014 9:23 PM Subject: Re: Topband: 160m Sloping Vertical Antenna? > > > On 12/24/2014 3:39 PM, Art Roberts - W5AER wrote: >> On the thought of a low dipole: >> >> Years ago in Northern California, as an experiment, I had a VERY low >> dipole and got some strange results. Listening to a local station, in >> the afternoon, there was very deep QSB. We were able to talk, but with >> difficulty. >> >> 73, >> Art W5AER >> > > Were you cross polarized; IE was the other station running a vertical? > If so, minor fluctuations in propagation could result in major > fluctations of polarization cancellation. > > Rick N6RK > _ > Topband Reflector Archives - http://www.contesting.com/_topband > > > - > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2014.0.4794 / Virus Database: 4253/8802 - Release Date: 12/24/14 > _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: 160m Sloping Vertical Antenna?
More likely it was a mix of groundwave and sky wave, if the station was local, cancelling or reinforcing signal as phase shifted on the sky wave path. - Original Message - From: "Richard (Rick) Karlquist" To: "Art Roberts - W5AER" ; Sent: Wednesday, December 24, 2014 9:23 PM Subject: Re: Topband: 160m Sloping Vertical Antenna? On 12/24/2014 3:39 PM, Art Roberts - W5AER wrote: On the thought of a low dipole: Years ago in Northern California, as an experiment, I had a VERY low dipole and got some strange results. Listening to a local station, in the afternoon, there was very deep QSB. We were able to talk, but with difficulty. 73, Art W5AER Were you cross polarized; IE was the other station running a vertical? If so, minor fluctuations in propagation could result in major fluctations of polarization cancellation. Rick N6RK _ Topband Reflector Archives - http://www.contesting.com/_topband - No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4794 / Virus Database: 4253/8802 - Release Date: 12/24/14 _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: 160m Sloping Vertical Antenna?
Hi Ed - I have done the same thing on 80/75 meters with great results using a tree and a sling shot to get the wire up. Used chicken wire for the ground system. Did this the first time from an apartment in Phoenix, Arizona in the late 90's using a 45 foot tree and put a 8ft x4ft pieced of chicken wire on the balcony of my 2nd floor apartment. Although tuned for 80/75, I got it to play on 160-10 with the appropriate matching devices. Worked 135 countries on 80/75 with this setup and since I was going through a divorce, it helped me keep my sanity. Happy holidays. Tnx and 73, Dave N7RK _ Topband Reflector Archives - http://www.contesting.com/_topband
