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## [TowerTalk] \$/db

 To: [TowerTalk] \$/db k6ll@juno.com (k6ll@juno.com) Thu, 19 Aug 1999 12:10:28 -0600
 ``` On Thu, 19 Aug 1999 17:46:10 +0000 alsopb writes: > >Guys, > >It looks like many stations are pushing the >envelop on improvements that can be made to >achieve a better transimitted signal. I'd like to >try and quantify what that "extra 2 db" might >cost. Don't forget to double the benefit if any change helps also on RECEIVE. Multiply the benefit by X if the change helps on X number of bands. > >I'd like to hear what station improvements you >would make to pick up extra db's. The goal is to >identify the most cost-effective ones. >It is clear that this is probably band dependent. >It surely is station dependent. > >Assume that you can run no more power. All "gain" >has to come from the output of the amp to the >ether. Assume only the HF bands and you're >primarily a DXer. > >Examples might be: > >1. Increase the number of radials on my 160 meter >inverted L from 8 to 60. Gain estimate 2 db (via >less ground loss), cost = \$1000 cost/db =\$500 Transmit benefit only. Rx is atmospheric noise limited. > >2. Replace my 10 meter antenna RG8 feedline (300') >with LMR600 . Cost = \$300, gain =2 db, cost/db = >\$150. I think it's more like 2.4 db. Under certain conditions on 10 meters, this gain may help on receive also, so multiply the benefit by 1.5. 300/(2.4 x 1.5) = \$83/db > >3. Raise my 40 meter dipole from 40 to 70'. >Estimated gain at 25 degree radiation angle = 3db, >cost =\$100 (tree climber), cost/db = \$33. This would help on Rx also, so divide by 2 = \$17/dB > >4. Match antennas better and get rid of antenna >tuner. Cost = 0, gain = 1db. Tx benefit only. > >Please give the old configuration and the proposed >improved configuration. You really need to start with a particular specific configuration, and figure the benefits incrementally from that point. However, I think the concept of multiplying the benefit by 2 if it helps both receive and transmit, and multiplying by X if it benefits X number of bands, is quite helpful. It is to me, anyway. Dave Hachadorian, K6LL San Diego, CA K6LL@juno.com ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj. -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm ```
 Current Thread [TowerTalk] \$/db, alsopb [TowerTalk] \$/db, John Langdon [TowerTalk] \$/db, Tom Osborne [TowerTalk] \$/db, k6ll@juno.com <= [TowerTalk] \$/db, Pete Smith [TowerTalk] \$/db, alsopb