Re: Topband: Reversible BOG?
- Original Message - From: Jim Miller j...@jtmiller.com To: topband@contesting.com Sent: Saturday, January 12, 2013 12:17 AM Subject: Re: Topband: Reversible BOG? As a follow up I wonder if rather than using windowline, whose transmission line performance would be subject to variations in weather, it might be better to use coax. The outside of the shield would always be the antenna but the interior acting as the transmission line would not be subject to weather variations. Coax reversible BOG? 73 jim ab3cv If you can, then raise the BOG a bit off the ground on low growth. I run mine 2-4 off the ground and thru the woods using military telephone line and the changing ground conditions dont appear to bother it much; directivity remains pronounced even when snow covered. Having poor ground conductivity to start with seems to help and the 2-3 ground rods (4' driven at angles here) plus 25-30' radials at both ends tends to stabilize things good enough anyway. Carl KM1H _ Topband Reflector
Re: Topband: Reversible BOG?
The reversible single coax Beverage is described in ON4UN 's Low Band DXing at least editions 4 5. I've built a couple elevated ones from ebay RG58 and they work fine. I think RG6/RG59 would work as well with small changes to the transformer ratios. Grant KZ1W On 1/11/2013 9:17 PM, Jim Miller wrote: As a follow up I wonder if rather than using windowline, whose transmission line performance would be subject to variations in weather, it might be better to use coax. The outside of the shield would always be the antenna but the interior acting as the transmission line would not be subject to weather variations. Coax reversible BOG? 73 jim ab3cv _ Topband Reflector _ Topband Reflector
Re: Topband: Reversible BOG?
Page 7-89 in the 5th edition of ON4UN's book. On Sat, Jan 12, 2013 at 11:34 AM, Grant Saviers gran...@pacbell.net wrote: The reversible single coax Beverage is described in ON4UN 's Low Band DXing at least editions 4 5. I've built a couple elevated ones from ebay RG58 and they work fine. I think RG6/RG59 would work as well with small changes to the transformer ratios. Grant KZ1W On 1/11/2013 9:17 PM, Jim Miller wrote: As a follow up I wonder if rather than using windowline, whose transmission line performance would be subject to variations in weather, it might be better to use coax. The outside of the shield would always be the antenna but the interior acting as the transmission line would not be subject to weather variations. Coax reversible BOG? 73 jim ab3cv _ Topband Reflector _ Topband Reflector _ Topband Reflector
Topband: Need help to improve DX on 1/2 acre lot from CA
Hello All, I just assigned myself onto this forum, its been a long time and needs some help and would appreciate some questions answered on this huge experienced based forum. First, I want to describe my problem. I have a 1/2 acre lot in the back property where I install my antennas. The largest HF antenna is a HyGain Hy Tower which works great on 40 and 80. On 160, I run a separate radiator that runs up the side of the hytower separated by 6 inch insulators up to the top and then runs horizontal sloped from the top of the hygain hytower downward to a fence support that results in a full sized 1/4 WL inverted L on 160. The 160 meter feedpoint is common to the hytower feedpoint. I live in the central valley of California which is only about 300 feet ASL. I do not live near the coast nor live in the high desert . Some facts regarding this station: 1. I still have not copied or worked into Europe. I have been on this band somewhat seriously for at least 5 years 2. I hear a few Russians but they don't hear me. 3. I heard a FM5 last few nights peaking 559, called him countleesly with no QSO. My power is about 800 W on this band ( single 3-500 ). I am looking into finding a single GS35 amp for all bands on HFlove that tube. 4. I don't have the capacity to erect a full size radiator on this band although I am curious about the Titanix 160 vertical, what it is and is it worth looking into ? 5. I have read a lot about the K9AY RX loop. I have room for is antenna but before I construct one, what are your opinions ? 6. I also read about a 225 foot beverage run close to the ground as a RX ant. How does this compare to the K9AY loop ? 7. What is the best short 160 vertical configuration that has the best performance for working DX ? 8. You will notice I mentioned that I only run a single ground radial on each band. Would adding lets say 3 more Make the difference between night and day for TX or RX ? I think that's about it for now...73. Jeff K7XQ Atwater, CA. K7XQ website: http://users.elite.net/k7xq/k7xq.html _ Topband Reflector
Topband: Help with RFI
Topband -- I am having a problem with RF getting into my Ethernet cables. Anyone have any recommendations for a clamp-on filter that would help remove 1.8 MHz RF? The problem seems to be frequency selective between (1800 to 1830 KHz). No problem 1830 and above. Thanks, Terry W7KW _ Topband Reflector
Topband: CQ 160 Contest Reminder
The 2013 CQ 160 Meter Contest is fast approaching. Conditions have been great, and the contest should be a good one. For information on this year's event and prior results check out the web site at: http://www.cq160.com/ There are some trophies available for sponsorship. If you are interested in helping out, send us a note. You can create your own if it's not on the list. Remember, the log deadline for submission for all CQ contests has been changed to 5 days. If you have any problem meeting this deadline, send a note to direc...@cq160.com with an explanation. We will try to accommodate you. The records page is in the process of being updated. If you think you have a new record for 2012, let us know. It will help us to prevent errors. 73, Andy N2NT Director CQ160 Contest _ Topband Reflector
Re: Topband: Help with RFI
I wrap a few turns of the CAT 5 Ethernet cable coming into the back of my shack PC around a few stacked 2.4 diameter #31 ferrite cores. Works for me. 73, Mike www.w0btu.com On Sat, Jan 12, 2013 at 4:48 PM, W7KW w7kw.te...@gmail.com wrote: I am having a problem with RF getting into my Ethernet cables. Anyone have any recommendations for a clamp-on filter that would help remove 1.8 MHz RF? _ Topband Reflector
Re: Topband: Need help to improve DX on 1/2 acre lot from CA
Hello All, I got several replies on my situation and really appreciate it. Just about every reply starting with adding more ground radials. I am having a hard time believing That simply adding ground radials will cause the signals to pop up out of the noise but Since I do not have any experience in this area, I will not argue with the experts So I will continue with a few more questions. I know for certain that it will improve the TX side though. BTW, I also want to mention that I live on the west coast. It is very difficult to work into EU from here and I am sitting in a RF hole ( central valley ) so I have virtually no high elevation or high desert to help my situation. This is also a big problem on 6 meters so working EME on this band solves that problem. The one good thing going for me is that I live In a relatively quiet location on most bands. Some replies mentioned that the radials don't necessarily have to be full 1/4 wavelength long. If this is the case, what is the smallest length that I can use to be effective ? The next challenges is laying down the multiple radials. One reply mentioned I can use less radials If they are elevated to about 10 feet. Any further comments and experiences on this ? One reply mentioned using a top loaded vertical ( short vertical using multiple horizontal Radials at the top ? ) How many operators use these and what were the results ? I don't know how long the band will be active until the band dies for the season so I am not sure How much longer I have to make these improvements. The challenge continues Jeff K7XQ Atwater, CA. K7XQ website: http://users.elite.net/k7xq/k7xq.html _ Topband Reflector
