Gents Thanks for your very quick replies, a lot via private emails – you guys are great and this 160M JN really appreciates it.
I didn’t realize the Lloyd’s BOG was a few inches above the ground, which makes a difference. Mine will be on the ground (with staples at points to make sure it stays there…..). 73 Mark K3MSB On Oct 17, 2016 12:29 PM, "Kip Edwards" <kedwa...@ltol.com> wrote: > Mark, > > The BOG here is 190 feet. It works very well and is quite > directional. As a result of my experience so far, I'm thinking of a second > one for the other directions. > > 73 Kip W6SZN > > -----Original Message----- > From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Mark > K3MSB > Sent: Monday, October 17, 2016 8:35 AM > To: Lloyd - N9LB > Cc: topBand List > Subject: Re: Topband: BOG - Selecting the Optimum Length > > Based upon N9LB’s comments, I just emailed Bruce and told him to hold my > order for a KB-1. > > I have just enough room for 200 ft for a BOG. Extending it to 250, 290 > feet etc is NOT an option for me. > > From my reading, I understood that 200 feet was not exact, but I didn’t > expect it to be 250 to 290 feet. If I had known that I would not have > even considered a BOG. > > With the cable, KB-1 etc (my BOG will be unidirectional to EU only, not > bidirectional), I really don’t want to invest close to $200 on an antenna > that will not do any better on RX than my Inverted-L. Saving it for a > Hi-Z 3 may be the better option. > > So, with only 200 feet to play with, is it worth it? > > I've no doubt BOGs work, I may not have the room for them. > > 73 Mark K3MSB > > On Oct 17, 2016 9:35 AM, "Lloyd - N9LB" <lloydb...@charter.net> wrote: > > > I have been asked how I arrived at the 290 foot BOG length. > > > > My original 200 foot BOG had a good F/B on 80m but showed almost no > > directivity on 160m, so this indicated to me that the BOG needed to be > > longer to improve the 160m performance with my particular soil > > conditions and environment. > > > > A search on the Internet produced recommendations for 160m BOG lengths > > of > > 247 to 290 feet. Knowing that I could always shorten the wire, I went > > with the longer number as a starting point. That produced a greatly > > improved 15 to 20 dB Front-to-Back ratio. > > > > The 290 foot length was not chosen for a good match, but that length > > just happened to result in a good match. > > > > Unfortunately, I did not measure the match on my 200 ft BOG before it > > was dismantled. > > > > The optimum 160m BOG length in your environment might be much > > different from what I found at my QTH. > > > > - - - I think the group would benefit from hearing what others have > > found to be their optimum BOG lengths - - - > > > > > > -----Original Message----- > > From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of > > Lloyd - N9LB > > Sent: Sunday, October 16, 2016 11:06 PM > > To: 'Topband' <topband@contesting.com> > > Subject: Re: Topband: BOG > > > > My Reversible Bog uses the KD9SV transformer set. It was originally > > 200 feet long, just increased to 290 feet and that made a very > > significant improvement on 160m front-to-back ratio, but hurt 80m > performance. > > > > Conditions here are: > > Wire run across a weedy field, as close to ground as possible (weeds > > trampled down to allow the wire to be close to ground - mostly 2-4 > > inches above the actual ground). Soil is a few inches of decent dirt, > > about one to two feet of clay, about one to two feet of sand, and then > > bedrock. Tops of the five foot ground rods can't be driven completely > > below the ground's surface. > > > > WX - a wetter than normal Summer and Fall here in Southern Wisconsin. > > > > My Antenna Analyzer shows a 1.45 : 1 match at 1825 KHz ( 75 ohm system ). > > > > I can send the analyzer plots to anyone that is interested. > > > > 73 > > > > Lloyd - N9LB > > > > -----Original Message----- > > From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of > > Charles Moizeau > > Sent: Sunday, October 16, 2016 10:20 PM > > To: Lloyd - N9LB <lloydb...@charter.net>; Topband > > <topband@contesting.com> > > Subject: Re: Topband: BOG > > > > Thanks Lloyd, > > > > But pls tell us your wire height and approximate description of gnd > > condx for your otherwise well-described bog. > > > > 73, > > > > Charles W2SH > > ________________________________ > > From: Topband <topband-boun...@contesting.com> on behalf of Lloyd - > > N9LB <lloydb...@charter.net> > > Sent: Sunday, October 16, 2016 7:15 PM > > To: topband@contesting.com > > Subject: Re: Topband: BOG > > > > Hello Tony! > > > > Ground conditions and wire height above ground make a huge difference > > in best length. > > > > I found the optimum for my BOG, using WD-1A wire and operating at 1825 > > KHz, at my QTH is 290 feet. > > > > 73 > > > > Lloyd - N9LB > > > > -----Original Message----- > > From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of > > N2TK, Tony > > Sent: Sunday, October 16, 2016 5:15 PM > > To: topband@contesting.com > > Subject: Topband: BOG > > > > Stretched out 200' of WD-1A along a stone wall. Kept it about 2" above > > the ground and right up against the stones. Fed it with a 300 ohm > > secondary transformer and left the far end unterminated. > > > > Used the MFJ-259 to sweep the bands starting at 1.67 MHZ. Saw on K1FZ > > notes that to find the best single wire length for 160M is to sweep > > the bands and check where the SWR goes to a low value and stays there. > > > > I couldn't find that frequency. I get dips at > > > > 2.58 MHZ 4.3:1 > > 3.36 MHZ 1.5:1 > > 4.39 MHZ 1.4:1 > > 6.033 MHZ 1.3:1 > > 9.807 MHZ 1.2:1 > > > > I didn't check any higher in freq. I only care about listening on 160M > > with it. > > I twisted both wires together at the feedpoint. > > Want to check it out first as a single ended BOG to see how it works > > before I go to the trouble of making it a two direction BOG. > > At one point the BOG is only 35' from my tower. > > Is it too high and does it need to be against the ground? > > > > Any feedback appreciated. > > > > N2TK, Tony > > _________________ > > Topband Reflector Archives - http://www.contesting.com/_topband > > > > _________________ > > Topband Reflector Archives - http://www.contesting.com/_topband > > _________________ > > Topband Reflector Archives - http://www.contesting.com/_topband > > > > _________________ > > Topband Reflector Archives - http://www.contesting.com/_topband > > > > _________________ > > Topband Reflector Archives - http://www.contesting.com/_topband > > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2016.0.7797 / Virus Database: 4664/13214 - Release Date: 10/15/16 > > _________________ Topband Reflector Archives - http://www.contesting.com/_topband