Re: Topband: Pseudo Inverted L & Radial Field
On 2011-10-25, at 8:57 PM, Steven Raas wrote: > 1) Would adding a a pair of 130' radials that are bent (running TO property > edge and then along property edge) give me any real world performance > difference? Would I have to add say 4 , 8 or 16 of these to make it worth > while in ADDITION to the existing radial field.? > Hi Steve, I highly recommend that you check into this EXCELLENT website for answers to your queries re. radial fields: http://www.antennasbyn6lf.com/2009/12/series-of-qex-articles-on-ground-system-experiments.html Rudy has done an absolutely stellar job documenting his experiments in this regard...I think you'll agree after having read through his articles contained therein. ~73~ de Eddy VE3CUI - VE3XZ ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: Receive ant question
I think a front end protector is some good amount of insurance. I listen on other receivers while transmitting. I have cooked an IC746PRO doing this and it was quite annoying. It tricked me into thinking everything was fine because it worked okay for a good long while, but ultimately I cooked it and felt like an idiot. 73 - Mark, N5OT - Original Message - From: "Its from Onion" To: Sent: Tuesday, October 25, 2011 12:40 AM Subject: Topband: Receive ant question > > > I'm looking to build and install my first beverage receive antenna. I use > a 756 Pro and wondering a couple questions from folks who have been there. > > 1. Do I need a pre-amp and if yes your suggestion. > 2. Do I need a front end saver and your thoughts again. > > Thank you and > > 73, > Lee > KE4VYN > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: JD1BME Minami Torishima QSL card for 160m
Steve and Topbanders, JD1BME is a legitimate call, which I know definitely operated from Ogasawara (OC-073) and QSLed. I'm 99.9% sure the 2007 activity, supposedly from Minami Torishima, was bogus. I worked JD1BME on 80 in January and sent a direct QSL to the JA QSL bureau and have never received a QSL or notification back. Bernie McClenny, W3UR The Daily DX The Weekly DX How's DX 3025 Hobbs Road Glenwood, MD 21738 410-489-6518 Get a free two weeks of The Daily DX and The Weekly DX http://www.dailydx.com/trial.htm ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Topband: Pseudo Inverted L & Radial Field
Hello everyone, I have on my makeshift Inverted L about 21 Radials ranging from 60' long to 20' all fanned out from the feed of my antenna out to my property edges.I am tuning the 'L' in shack with a tuner, as without it.. SWR is approaching 2:1 I do realize laying radials on ground detunes them, however considering none of them are even close to 1/4 wl on 160 my question is this: 1) Would adding a a pair of 130' radials that are bent (running TO property edge and then along property edge) give me any real world performance difference? Would I have to add say 4 , 8 or 16 of these to make it worth while in ADDITION to the existing radial field.? If any one has further questions as to the current antenna set up pse chk my QRZ page.. as I have some photos explaining the exact layout of that antenna and radial field. ( Ive already had many comments abt the 'antenna support structure @ the rear of my Shed in my yard, I know its close to power lines.. I know the dangers.. Im willing to take that risk @ the moment.. actual antenna wire is in the order of 8' away from the power lines..yes 8'.. its a city lot.. I have to make compromises, and I do appreciate the concern) 73's, -Steve Raas N2JDQ ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: Need help feeding tower on 160 AND 80
Thanks for all the responses. One respondent recalled hearing of success with a similar setup on the Towertalk reflector. By searching the archives for "shunt bands" I found an "existence theorem" at: http://lists.contesting.com/archives//html/Topband/1997-12/msg00194.html I followed the prescription to connect the gamma wires for the two bands to different tower legs, then realized that I had made a serious mistake by failing to reduce the tower-to-gamma wire spacing for the 80m feed. With these two changes, I am able to get the desired behavior on both bands, by switching from one series cap to the other. 73 -- Brian -- K1LI On Tue, Oct 25, 2011 at 10:07 AM, Brian Machesney wrote: > Gang, > > I have an 80-ft tower topped by an KT34XA (elements insulated from 32-ft > boom) and 40-2CD (only reflector electrically connected to 22-ft boom). I > have 8 x 50-ft lengths of 4-ft wide welded, galvanized steel fence for a > ground screen. No other radials. > > I have successfully matched this on 160 with about 350-pF series capacitor > to a 45-ft #12 gamma wire spaced about 3-ft from the tower. > > I also want to feed the tower on 80. I have been hoping that the 160 gamma > wire would "disappear" electrically when it is open-circuited. Given the > complex configuratino of the GAP vertical antennas, this may be but a faint > hope. I'm having trouble creating a good match on 80 with a simple gamma > feed scheme. > > Has anyone on the reflector tried to feed the same tower on two bands? > > Please reply off-reflector. > > Thanks and 73, > > Brian K1LI > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK > -- -- The hallmark of a successful parasite is that it never kills its host -- ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
