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: Reversible BOG?
I'm putting in reversible Beverages to give me better reception on 80, 40 and 160m. I realize both of them are likely too short for great 160m performance but it's the best I can do with my limited lot size. One will be NW/SE and around 250ft long (maybe more pending neighbor agreement) and elevated above deer height in the woods. The other NE/SW will be partially in the woods at a similar elevation but the remainder may need to be BOG for 100ft of it's 325 foot total. I realize this isn't optimal but given my HOA CCR situation it is least likely to get me noticed. Alternatives aren't very appealing at this time. Any insight as to how the NE/SW reversible BOG might perform relative to a more standard implementation? Thanks Jim ab3cv _ Topband Reflector
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 _ Topband Reflector
