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21. Re: Topband: spectrum scopes, swling and contests (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 31 Dec 2009 10:37:40 -0500
Bill, MRP is a single channel decoder. In this case it is no different than using a panadapter (SDR without decoding) and single channel CW Decoder (e.g., WriteLog). That is not (yet) prohibited for
/archives//html/Topband/2010-01/msg00001.html (12,426 bytes)

22. Re: Topband: FAR Circuits K9AY Loop Preamp/Bandpass filter (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 6 Jan 2010 14:44:34 -0500
Pete, You are looking at the schematic backward. The input goes to the filter then through the preamp and back out the relay. The four series caps plus the shunt LC sections are a high pass filter wi
/archives//html/Topband/2010-01/msg00077.html (10,626 bytes)

23. Re: Topband: Narrow Filtering (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Tue, 2 Feb 2010 23:28:23 -0500
Unfortunately, for some who are afflicted by what the musicians call a "tin ear" +/- 200 Hz may well be "the right frequency" - at least as well as they can tell it. Tuning to the right frequency ge
/archives//html/Topband/2010-02/msg00037.html (10,091 bytes)

24. Re: Topband: Inverted L (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sun, 14 Feb 2010 13:19:47 -0500
An even larger problem is that changing the elements of an F12 antenna from insulated mounting to grounded with the relatively large boom to element plate will detune the antenna. The element mounti
/archives//html/Topband/2010-02/msg00130.html (11,953 bytes)

25. Re: Topband: Fw: Low band RX antenna question de N0AH (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 25 Nov 2010 10:43:03 -0500
The original "Front End Saver" was by KD9SV. Google found the article from CQ Magazine (February 1997) here: <http://www.k0to.us/HAM/Articles/KD9SV%20Front%20End%20Saver%20Feb%2097%2073mag.pdf> A ci
/archives//html/Topband/2010-11/msg00107.html (9,790 bytes)

26. Re: Topband: The AM Brick Wall (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 25 Nov 2010 11:10:31 -0500
Hijacking an old e-mail for new information ... For those looking for solutions to eliminate/reduce overload from nearby AM broadcast transmitters, Jack Smith, W8OZA at Clifton Laboratories now has t
/archives//html/Topband/2010-11/msg00108.html (8,560 bytes)

27. Re: Topband: The AM Brick Wall (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 25 Nov 2010 20:25:28 -0500
Fortunately allocations at the top end of the MW band tend to be "local" or regional ... typically 5 KW or so ... not the 50 KW monsters found lower in the band. Unless one lives right next door to a
/archives//html/Topband/2010-11/msg00113.html (10,412 bytes)

28. Re: Topband: Pixel Technologies (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sat, 12 Feb 2011 17:48:06 -0500
Does anyone have a reference to the technological basis for the alleged superiority of the "moebius loop" over other amplified, broadband "shielded" loops? In other words, what makes this antenna any
/archives//html/Topband/2011-02/msg00136.html (8,777 bytes)

29. Re: Topband: 160 metre vertical with 'top loading' (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Tue, 26 Apr 2011 23:11:52 -0400
"Mobile antenna shootouts" are about as much like real antenna engineering as the World Wrestling Federation is like Olympic wrestling. Any coil that shows a 60% decrease in current through it has a
/archives//html/Topband/2011-04/msg00143.html (12,873 bytes)

30. Re: Topband: Bi-Directional Beverage Question - DXE Polarity (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 11 Aug 2011 10:44:53 -0400
If one studies operation of the two wire Beverage, the only effect of reversing the two wire line would be in phase of signals arriving from the feed end. That would imply that polarity of the two w
/archives//html/Topband/2011-08/msg00013.html (9,513 bytes)

31. Re: Topband: New entry to TopBand with antenna question (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 07 Sep 2011 09:43:28 -0400
Or you add an antenna switch between the transceiver and amplifier like this one: http://www.radiobooks.com/products/svdxii.htm The KD9SV unit is a commercial unit that includes receive antenna swit
/archives//html/Topband/2011-09/msg00058.html (10,552 bytes)

32. Re: Topband: Receiver front end protector (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 17 Oct 2011 16:22:58 -0400
Unless the transformers in the ICE unit are carefully controlled - and it's impossible to tell what the impedance ratios are from the pictures - the ICE196 will most certainly clip at (probably) 1.4
/archives//html/Topband/2011-10/msg00133.html (9,168 bytes)

33. Re: Topband: Another non-traditional antenna working. (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 16 Nov 2011 23:04:39 -0500
Guy, Why is an isolation transformer required and not a simple tapped or series (as appropriate to the impedance of the vertical element) coil with a high quality common mode choke? What is the spaci
/archives//html/Topband/2011-11/msg00130.html (20,387 bytes)

34. Re: Topband: Inverted L (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 30 Nov 2011 00:12:45 -0500
While that may be true for loss at the lower HF range, it is not the case in the upper HF/Low VHF and UHF range. RG-6 will show from 1 to 5 dB more loss depending on frequency. In addition, RG-6 wil
/archives//html/Topband/2011-11/msg00289.html (8,986 bytes)

35. Re: Topband: Changes To My Shunt Fed Tower (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 12 Dec 2011 10:47:03 -0500
Any coax fed antenna is never isolated from the tower/mast unless the antenna switch/antenna relay is a double pole design and contained in an insulated (non-conductive) case. Even then, there is ge
/archives//html/Topband/2011-12/msg00243.html (11,934 bytes)

36. Re: Topband: BCI (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Tue, 13 Dec 2011 18:28:23 -0500
From personal experience, WTVN-AM has had third harmonic issues going back as far as 35 years. Remove your receive protector and check other antennas to be sure the "harmonic" is still there. Also tu
/archives//html/Topband/2011-12/msg00333.html (8,159 bytes)

37. Re: Topband: Shunt fed tower (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 15 Dec 2011 10:17:35 -0500
That is true but a 100 foot tower with decent sized 20M monobander or 24 foot boom tribander with the front/back elements grounded and a short 40 meter yagi will most certainly have a natural resonan
/archives//html/Topband/2011-12/msg00362.html (11,547 bytes)

38. Re: Topband: Shunt fed tower (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 15 Dec 2011 10:59:32 -0500
All true but one does not want a tower that is "too tall" that the pattern deteriorates. The shunt is *not* connected to the 50 Ohm point. It is connected to the point that is *transformed to 50 Ohms
/archives//html/Topband/2011-12/msg00370.html (14,763 bytes)

39. Re: Topband: 1820 BCB (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 21 Dec 2011 22:24:31 -0500
Of course Roger has an advantage ... he can complain to Industry Canada (Canadian equivalent of the FCC) about the interference and ask them to make an international complaint to the FCC. Nothing wil
/archives//html/Topband/2011-12/msg00511.html (9,792 bytes)

40. Re: Topband: Digital on 160m? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 29 Dec 2011 11:55:24 -0500
1838 USB dial frequency seems to be popular for JT65 Traditional RTTY appears below 1810. 73, ... Joe, W4TV _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
/archives//html/Topband/2011-12/msg00582.html (7,198 bytes)

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