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1. Re: Topband: Coax for Beverage feed? (score: 1)
Author: "Brad Rehm" <bradrehm@gmail.com>
Date: Wed, 7 Mar 2007 09:04:04 -0600
Deni, Many hams are using RG-59 and RG-6 TV coaxial cable to feed their Beverages. On the low bands, loss is not significant, even for long runs. The loss due to the 75-to-50 Ohm mismatch can be ign
/archives//html/Topband/2007-03/msg00034.html (8,209 bytes)

2. Re: Topband: rigs for top band (score: 1)
Author: "Brad Rehm" <bradrehm@gmail.com>
Date: Mon, 20 Aug 2007 09:31:55 -0500
Steve, A few thoughts about the FT-2000: I've waited for the folks with more experience with the FT-2000 to weigh in with their comments. But since you're still wondering if the MTUs would improve th
/archives//html/Topband/2007-08/msg00062.html (10,658 bytes)

3. Re: [RTTY] Topband: Foam (score: 1)
Author: "Brad Rehm" <bradrehm@gmail.com>
Date: Tue, 30 Oct 2007 07:45:29 -0600
Rick, We have several measurement products in our EMC lab that were filled with foam by the manufacturers to keep out moisture and mechanically stabilize them. This has made servicing them almost im
/archives//html/Topband/2007-10/msg00185.html (7,019 bytes)

4. Re: Topband: pre-selector/filter (score: 1)
Author: "Brad Rehm" <bradrehm@gmail.com>
Date: Thu, 15 Nov 2007 09:31:37 -0600
Denny, I agree with your comment on the VRF in the Mk V. It's interesting that the very expensive micro-tune filters in the newer Yaesu radios don't seem to me to work as well. Which of the older re
/archives//html/Topband/2007-11/msg00121.html (7,446 bytes)

5. Re: Topband: Buried Coax for Rx Array (score: 1)
Author: "Brad Rehm" <bradrehm@gmail.com>
Date: Tue, 4 Dec 2007 12:40:58 -0600
Greg, I'm not familiar with either of those two Belden types, so I can only contribute the following: I've had good luck burying RG58 and RG6 by first placing it in 1/2" PVC pipe. This is widely ava
/archives//html/Topband/2007-12/msg00037.html (7,733 bytes)

6. Re: Topband: tar (score: 1)
Author: "Brad Rehm" <bradrehm@gmail.com>
Date: Fri, 8 Feb 2008 09:06:41 -0600
i am thinking - how about covering them in plastic Mike, I can't think of a reason why the mastic or caulk wouldn't protect the splices. The only problem might be that it would be very hard to inspec
/archives//html/Topband/2008-02/msg00057.html (7,825 bytes)

7. Re: Topband: Plexiglas Coax Feed through (score: 1)
Author: "Brad Rehm" <bradrehm@gmail.com>
Date: Wed, 5 Nov 2008 17:06:02 -0600
"Does anyone know where to get the Plexiglas expandable pane (to put in windows) which has the coax feed through (double female UHF connectors) mounted on them? Thanks Allan W2TN Allan, Several plast
/archives//html/Topband/2008-11/msg00051.html (7,363 bytes)

8. Re: Topband: BOG (score: 1)
Author: "Brad Rehm" <bradrehm@gmail.com>
Date: Fri, 9 Jan 2009 14:23:13 -0600
Petr, I've heard of several topbanders who are successfully using BOGs. Also, my friend, WB9FPQ, has had success with a BUW (Beverage Under Water) at his freshwater Michigan QTH. There's good reason
/archives//html/Topband/2009-01/msg00080.html (7,074 bytes)

9. Re: Topband: Inverted L (score: 1)
Author: "Brad Rehm" <bradrehm@gmail.com>
Date: Mon, 12 Jan 2009 16:19:36 -0600
I would like to know opinions on whether to go with a ground radial system or if an elevated counterpoise would work better. Thanks Darl NA8W Darl, I've just finished an Inverted-L for topband, using
/archives//html/Topband/2009-01/msg00108.html (7,337 bytes)

10. Re: Topband: RX antenna switching (score: 1)
Author: Brad Rehm <bradrehm@gmail.com>
Date: Wed, 4 Mar 2009 10:16:05 -0600
Pete, Another solution: I use a multi-port amplifier that W8ZR sold a few years ago in partial kit form. This box takes one antenna in and has a preamp that can be switched in and out. Another built
/archives//html/Topband/2009-03/msg00011.html (7,976 bytes)

11. Re: Topband: inverted L fed with coax (score: 1)
Author: Brad Rehm <bradrehm@gmail.com>
Date: Tue, 16 Jun 2009 13:22:26 -0500
Evan, My inverted-L has the same dimensions as the one you describe. It's installed on a pole so that the base is about 9 feet above ground. Four above-ground radials serve as the counterpoise. I fee
/archives//html/Topband/2009-06/msg00057.html (7,705 bytes)

12. Re: Topband: automotive relays (score: 1)
Author: Brad Rehm <bradrehm@gmail.com>
Date: Sat, 14 Nov 2009 07:20:52 -0600
Dave, I've looked at the automotive relays for RF use because they're easy to find locally, and they have large, low-inductance contacts. But a few years ago, someone on the reflector recommended ano
/archives//html/Topband/2009-11/msg00349.html (8,236 bytes)

13. Re: Topband: Beverages inside a hedgerow? (score: 1)
Author: Brad Rehm <bradrehm@gmail.com>
Date: Wed, 18 Nov 2009 10:38:54 -0600
Colin, Feeding your Beverage 600' from the shack should not be a problem. Loss in most kinds of coax will be very low at lowband frequencies, and it will be nothing like the negative gain figures you
/archives//html/Topband/2009-11/msg00374.html (8,501 bytes)

14. Re: Topband: suitable wire for top loading wires? (score: 1)
Author: Brad Rehm <bradrehm@gmail.com>
Date: Wed, 17 Mar 2010 09:31:24 -0600
Jonathan, I agree with Mike's comments about galvanized wire. I built my elevated inverted-L using galvanized fence wire for the radials. No problem soldering it at the junction with the copper grou
/archives//html/Topband/2010-03/msg00085.html (9,427 bytes)

15. Re: Topband: protect my transmitter from atmospheric discharges (score: 1)
Author: Brad Rehm <bradrehm@gmail.com>
Date: Wed, 2 Jun 2010 11:16:44 -0500
I agree, George, that a manual disconnect is the best way to avoid damage. But I wouldn't consider leaving out the resistor or choke. One evening many years ago, I was listening on 160 with a vertica
/archives//html/Topband/2010-06/msg00010.html (8,710 bytes)

16. Re: Topband: 2-Way Splitter (score: 1)
Author: Brad Rehm <bradrehm@gmail.com>
Date: Tue, 19 Oct 2010 21:23:26 -0500
Stew, Just checked a Radio Shack hybrid splitter/combiner with my spectrum analyzer + tracking generator. Above 3 MHz, loss is 4-5 dB through the UHF TV band. At 1.8 MHz, it's about 8 dB. These aren'
/archives//html/Topband/2010-10/msg00097.html (7,568 bytes)

17. Re: Topband: Alternatives to Coax... (score: 1)
Author: Brad Rehm <bradrehm@gmail.com>
Date: Thu, 2 Dec 2010 21:44:34 -0600
Brian, Ought to work very well. Cat 5 cable is designed for data rates at higher frequencies than our low band gear will use. I'd terminate the unused pairs with 100 resistors at both ends, though, t
/archives//html/Topband/2010-12/msg00008.html (8,001 bytes)

18. Re: Topband: Kenwood TS-590S internal birdie on 160? (score: 1)
Author: Brad Rehm <bradrehm@gmail.com>
Date: Wed, 29 Dec 2010 09:11:37 -0600
Neil, It's there, but it's weak. It doesn't register on the S-meter, and I haven't noticed it before because the band noise, even on a quiet night, covers it up. I don't think this is anything to be
/archives//html/Topband/2010-12/msg00144.html (8,132 bytes)

19. Re: Topband: improve the lightnings charges protect for my equipment 160m (score: 1)
Author: Brad Rehm <bradrehm@gmail.com>
Date: Mon, 20 Jun 2011 16:42:15 -0500
Tzikas, The only way to be certain your equipment is protected is to disconnect it. By this I mean that you should disconnect all of your equipment from the antenna, the station ground, and the AC ma
/archives//html/Topband/2011-06/msg00014.html (9,266 bytes)

20. Re: Topband: 160 meters (score: 1)
Author: Brad Rehm <bradrehm@gmail.com>
Date: Mon, 2 Jan 2012 11:34:16 -0600
Bert, I'm not sure who the manufacturer is, but I've been able to buy LMR-600 connectors at Austin Amateur Radio Supply in Austin. I believe they have both the compression and the crimp-on varieties.
/archives//html/Topband/2012-01/msg00015.html (8,091 bytes)

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