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261. Re: Topband: Narrow Filtering (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Tue, 2 Feb 2010 14:37:38 -0800
Here is what is wrong with this oft quoted "wisdom": When there is a run station every 300 Hz, it becomes difficult to distinguish between a station calling me off-frequency vs a station calling my "
/archives//html/Topband/2010-02/msg00028.html (8,142 bytes)

262. Re: Topband: Narrow Filtering (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Wed, 03 Feb 2010 08:59:02 -0800
Operators who are challenged to tune by ear might do well to use a visual tuning indicator. My FT1000 has one built in. Rick N6RK _______________________________________________ UR RST IS ... ... ..9
/archives//html/Topband/2010-02/msg00048.html (9,101 bytes)

263. Re: Topband: N6LF Article in March QST (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Wed, 17 Feb 2010 10:51:31 -0800
I've had a lot of private discussions with N6LF about these tests. First of all, let me say that, unlike many other QST antenna articles, you can actually believe this one. Rudy did his measurements
/archives//html/Topband/2010-02/msg00153.html (8,690 bytes)

264. Re: Topband: Amplifier Help (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Wed, 17 Feb 2010 20:54:15 -0800
How did you determine it worked great? In most two element arrays the impedance of the rear element is virtually a short circuit. The second amplifier goes to waste as it cannot deliver any significa
/archives//html/Topband/2010-02/msg00156.html (8,131 bytes)

265. Re: Topband: Amplifier Help (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Thu, 18 Feb 2010 09:20:44 -0800
I have a complete Intech COM1000 amplifier, which Intech rates at 1000W by the way, which make the modules 250W each. I push it to 1500W with a little bit of compression. By the way, I have posted th
/archives//html/Topband/2010-02/msg00161.html (9,819 bytes)

266. Re: Topband: Radial requirements for 1/2 wave vertical? (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Thu, 18 Feb 2010 21:46:55 -0800
with 4 elevated radials, and that's how I fed it. I used to work VK's and ZL's nightly with it from my old QTH in NW Ohio. a 1/4 wave (or shorter) vertical. But I think I read in ON4UN's book "Low Ba
/archives//html/Topband/2010-02/msg00164.html (9,127 bytes)

267. Re: Topband: Radial requirements for 1/2 wave vertical? (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Fri, 19 Feb 2010 08:01:13 -0800
I'm not sure that perfect ground is the same as "lots" of radials, where "lots" is 60 half wave radials. You are modeling, I measured real antennas. The measurements were done on 20 meters, so there
/archives//html/Topband/2010-02/msg00168.html (7,734 bytes)

268. Re: Topband: Earth conductivity (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Fri, 26 Feb 2010 08:38:00 -0800
Sounds exactly like my 20 acres. We tried to rip it up with a 7 foot plow and it stalled a 100 ton, 600HP CAT D-10. My clay goes down 30 feet before hitting sand. My land is shown as near 30 mS on th
/archives//html/Topband/2010-02/msg00215.html (10,029 bytes)

269. Re: Topband: suitable wire for top loading wires? (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Tue, 16 Mar 2010 15:10:04 -0700
What I do is fasten stranded hook up wire to dacron rope with small cable ties every 3 to 6 feet. The ropes are used to guy the top of the vertical. I let the ropes take all the mechanical abuse. The
/archives//html/Topband/2010-03/msg00077.html (8,432 bytes)

270. Re: Topband: 160 CW WAS (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Thu, 18 Mar 2010 19:30:52 -0800
The "Century" net on 1895 kHz is for working WAS. Rick N6RK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
/archives//html/Topband/2010-03/msg00104.html (6,961 bytes)

271. Re: [RFI] Question from CO8LY (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Wed, 24 Mar 2010 10:33:01 -0700
The Drake filter is excellent. I could run 1500W on 10 meters and watch channel 2 on 54-60 MHz with zero QRM using a TV antenna spaced less than 1 meter away from my 10m Yagi. The Channel 2 transmitt
/archives//html/Topband/2010-03/msg00133.html (7,614 bytes)

272. Re: Topband: 2 elem Top loaded vertical (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Sun, 28 Mar 2010 08:26:10 -0800
I built a 2 element driven array of top loaded 27 meter verticals that were spaced 30 meters apart. It worked about as predicted, with around 4 dB forward gain and 15 to 20 dB F/B. The bandwidth was
/archives//html/Topband/2010-03/msg00151.html (8,419 bytes)

273. Re: Topband: Top Loaded Vertical (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Wed, 05 May 2010 09:34:00 -0700
There is a point of diminishing returns on the sloping top loading wires. The radiation resistance increases with increasing length up to a point and then decreases with further lengthening. IMHO, yo
/archives//html/Topband/2010-05/msg00019.html (8,637 bytes)

274. Re: Topband: VERTICAL SPACING (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Fri, 04 Jun 2010 09:14:10 -0700
You don't need a 1/4 wavelength = 134 ft. You actually get more gain with 1/8 wavelength. Less is more. Anything in between is OK too. Rick N6RK _______________________________________________ UR RST
/archives//html/Topband/2010-06/msg00019.html (7,218 bytes)

275. Re: Topband: VERTICAL SPACING (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Sun, 6 Jun 2010 07:19:26 -0700
Rather than going to that trouble, simply tune for maximum front to back ratio. If you get a 20+ dB null off the back, you can be sure the currents are equal and at the correct angle. Rick N6RK _____
/archives//html/Topband/2010-06/msg00026.html (8,392 bytes)

276. Re: Topband: K3NA Loop Array (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Sun, 20 Jun 2010 19:12:57 -0700
I built a loop the same size as in the forum paper and the bandwidth was something like 10% of what was shown. I used critical coupling (ie a conjugate match). In order to cover the whole 160 meter b
/archives//html/Topband/2010-06/msg00052.html (8,964 bytes)

277. Re: Topband: K3NA Loop Array (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Mon, 21 Jun 2010 07:38:20 -0700
I'm still confused. The loop has an unloaded Q of about 100. Somehow, this is "matched" to Zo with a 10% bandwidth. Where is the lossy element if not R1. Could it be core loss in the MPP core? Why co
/archives//html/Topband/2010-06/msg00053.html (8,389 bytes)

278. Re: Topband: K3NA Loop Array (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Mon, 21 Jun 2010 10:38:59 -0700
The lumped element delays shown on my web site are virtually identical to coax delay lines when used within the recommended bandwidth. They use additional elements to get flat delay. You might have b
/archives//html/Topband/2010-06/msg00055.html (12,014 bytes)

279. Re: Topband: K3NA Loop Array (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Wed, 23 Jun 2010 08:23:36 -0700
My Sacramento delta QTH is highly conductive, at least according to the FCC map, and I do have Beverages, but the length is limited to less than 500 feet due to high losses, as verified by measuring
/archives//html/Topband/2010-06/msg00061.html (8,726 bytes)

280. Re: Topband: K3NA Loop Array (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Thu, 24 Jun 2010 08:58:38 -0700
No this is not correct. The highly conductive ground causes the current to drop off and renders the wire beyond a certain length useless. Because it is effectively a short Beverage, it won't have a g
/archives//html/Topband/2010-06/msg00073.html (10,135 bytes)

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