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381. Re: [TenTec] OT: Openwire/Window Line and Bad Wx (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Sat, 03 Aug 2013 15:50:48 +0100
Bob, Perhaps I had better explain clearly why I am carrying out these ladderline tests. I believe that the "wet" ladderline losses reported by Wes Stewart, and those predicted by at least two of the
/archives//html/TenTec/2013-08/msg00045.html (13,851 bytes)

382. Re: [TenTec] OT: Openwire/Window Line and Bad Wx (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Sat, 03 Aug 2013 20:58:59 +0100
Now re-run EZNEC with the dipole at 25ft and at 55ft over average ground, and compare the losses reported by EZNEC with your figures; you'll see something very different! Orr's "logic" is way too sim
/archives//html/TenTec/2013-08/msg00057.html (12,833 bytes)

383. Re: [TenTec] OT: Openwire/Window Line and Bad Wx (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Sat, 03 Aug 2013 22:04:29 +0100
Run any FF 3D plot and look at the Average Gain figure; it will tell you what fraction of the total input power is reaching the Far Field. If you set the wire losses to zero, you'll be left with just
/archives//html/TenTec/2013-08/msg00060.html (11,894 bytes)

384. [TenTec] Wet ladderline (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Thu, 08 Aug 2013 22:59:39 +0100
I managed to find time today to produce a web page on my measurements. For anyone interested: http://www.karinya.net/g3txq/wet_ll/ 73, Steve G3TXQ _______________________________________________ TenT
/archives//html/TenTec/2013-08/msg00124.html (7,986 bytes)

385. Re: [TenTec] Wet ladderline -- Comments on QST report (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Fri, 09 Aug 2013 14:19:31 +0100
Joel, That'll teach me to read things more carefully - I'll modify the conclusions accordingly. I'm now waiting for some ice/snow conditions ...... but I don't think it'll be within the next few days
/archives//html/TenTec/2013-08/msg00140.html (10,673 bytes)

386. Re: [TenTec] Wet ladderline -- Comments on QST report (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Fri, 09 Aug 2013 14:33:15 +0100
That's probably close enough for this sort of work! But it's maybe worth pointing out that an unmatched line does not have uniform losses along its length - the losses are higher at the standing wave
/archives//html/TenTec/2013-08/msg00141.html (9,790 bytes)

387. Re: [TenTec] Wet ladderline (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Fri, 09 Aug 2013 19:00:41 +0100
Dean, With respect, TLW doesn't agree with my results! Taking the " 450-Ohm Window Ladder Line" option, 60ft long, with a 50 Ohm load, at 29.5MHz TLW predicts a loss of 0.356dB - that's almost exactl
/archives//html/TenTec/2013-08/msg00146.html (11,466 bytes)

388. Re: [TenTec] Wet ladderline (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Fri, 09 Aug 2013 21:56:05 +0100
Jim, Thanks for pointing me in the direction of Zplots - I'd not appreciated what it can do, although I'm a big fan of AC6LA's TLD software. I just downloaded Zplots and ran open and short S11 tests
/archives//html/TenTec/2013-08/msg00152.html (10,910 bytes)

389. Re: [TenTec] Wet ladderline (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Fri, 09 Aug 2013 21:58:29 +0100
Yes it can - check the skin depth at 10MHz! Then try it again at 50MHz and you'll get 19 Ohms for 100ft! Steve G3TXQ S. Rohre _______________________________________________ TenTec mailing list TenTe
/archives//html/TenTec/2013-08/msg00153.html (10,388 bytes)

390. Re: [TenTec] Wet ladderline (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Fri, 09 Aug 2013 22:00:31 +0100
For future reference: http://ve3efc.ca/wire_ohms.html Steve G3TXQ Then try it again at 50MHz and you'll get 19 Ohms for 100ft! Steve G3TXQ S. Rohre _______________________________________________ Ten
/archives//html/TenTec/2013-08/msg00154.html (10,873 bytes)

391. Re: [TenTec] Wet ladderline (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Fri, 09 Aug 2013 22:47:04 +0100
On an unmatched line, losses vary with length because there are current peaks and troughs along the line. And because at HF losses are almost entirely copper losses, where the current peaks the losse
/archives//html/TenTec/2013-08/msg00157.html (10,754 bytes)

392. Re: [TenTec] Wet ladderline (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Sat, 10 Aug 2013 09:36:52 +0100
Jim, I'm comparing like for like: TLD's loss predictions for the line with a 50 Ohm load, vs my measured results with a 50 Ohm load. I'm pretty sure my line is equivalent to Wireman 551, and therefor
/archives//html/TenTec/2013-08/msg00163.html (13,987 bytes)

393. Re: [TenTec] Wet ladderline (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Sat, 10 Aug 2013 12:23:20 +0100
Well, I just spent two hours re-calibrating everything; results using Zplots were marginally better, but still not acceptable. Re-reading Dan's notes on Zplots' "Measure Transmission Line Parameters"
/archives//html/TenTec/2013-08/msg00164.html (10,665 bytes)

394. Re: [TenTec] Wet ladderline (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Thu, 15 Aug 2013 11:00:28 +0100
For anyone interested, web page updated with a further test to see the effect of ladderline in contact with a length of aluminium. Test 11 here: http://www.karinya.net/g3txq/wet_ll/ Steve G3TXQ _____
/archives//html/TenTec/2013-08/msg00222.html (7,627 bytes)

395. Re: [TenTec] Wet ladderline (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Thu, 15 Aug 2013 13:26:01 +0100
The water I used was collected rain water; I also tried tap water at one stage, but results between the two were indistinguishable. The line is still set up waiting for some heavy rain - I'm interest
/archives//html/TenTec/2013-08/msg00225.html (8,935 bytes)

396. Re: [TenTec] Wet ladderline (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Thu, 15 Aug 2013 14:10:36 +0100
I wont name the "expert" directly, but a thorough search of the QRZ.COM Antenna forum would reveal all. However, you will only now find *quotes* from his postings - the postings themselves have all b
/archives//html/TenTec/2013-08/msg00226.html (8,919 bytes)

397. Re: [TenTec] Herc 2 LP Cap? (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Tue, 27 Aug 2013 20:58:56 +0100
At the 550W level the capacitor will have about 166v rms across it when looking into a matched load - on 20m that's 1.46A rms through the capacitor and 234v peak across it. Worst-case, if the load SW
/archives//html/TenTec/2013-08/msg00301.html (9,035 bytes)

398. Re: [TenTec] Herc 2 LP Cap? (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Tue, 27 Aug 2013 22:32:43 +0100
C42 is a shunt component on the *input* side of the LPF - the voltage across it is the full output voltage of the four combined PA modules, fundamental plus harmonics. At 14MHz it's reactance is 114
/archives//html/TenTec/2013-08/msg00314.html (10,089 bytes)

399. Re: [TenTec] Value of RX Only Antennas (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Tue, 01 Oct 2013 22:34:19 +0100
I agree! But it's worth noting that the gain of a beam, referenced to a dipole at the same height, varies with take-off angle; so how much louder you will be on your beam compared to a dipole in exac
/archives//html/TenTec/2013-10/msg00018.html (10,775 bytes)

400. Re: [TenTec] 160 meters, ten ted 238 tuner, part two (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Thu, 31 Oct 2013 21:57:19 +0000
Rick, Doesn't that halve the CM impedance? Steve G3TXQ If you have a 4:1 Current Balun, then you can easily re-wire it as a 1:1 current balun. You just swap two connections inside. IN FACT... if you
/archives//html/TenTec/2013-10/msg00436.html (9,730 bytes)

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