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61. Re: [Amps] How to read the 3-500Z spec sheet? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sun, 23 May 2010 18:49:11 -0400
I don't care what kind of transition Joe has programmed into the DSP. The rise time/wave shaping makes little difference with a class C amplifier because the sharp turn on/turn off characteristic an
/archives//html/Amps/2010-05/msg00355.html (16,455 bytes)

62. Re: [Amps] How to read the 3-500Z spec sheet? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sun, 23 May 2010 19:06:59 -0400
Sure, if you end up reducing the drive by 3 dB because the user can't tell the difference between 1 dB compression in the amplifier and 1 dB of foldback in the drive due increased input SWR. You do
/archives//html/Amps/2010-05/msg00356.html (11,971 bytes)

63. Re: [Amps] How to read the 3-500Z spec sheet? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sun, 23 May 2010 21:15:51 -0400
NO! You have to know what the two values are in order to know what the ratio is, Even if you're using a two channel scope, it is necessary to measure the specific RF voltages. Then, IF you know the
/archives//html/Amps/2010-05/msg00364.html (12,642 bytes)

64. Re: [Amps] How to read the 3-500Z spec sheet? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sun, 23 May 2010 21:34:26 -0400
No, I've watched WSJT and the output does not sweep from tone to tone. There is a shape to each tone. That shape will be destroyed by a class C amplifier. Then you need a better receiver. A carrier
/archives//html/Amps/2010-05/msg00366.html (16,469 bytes)

65. Re: [Amps] How to read the 3-500Z spec sheet? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sun, 23 May 2010 23:45:12 -0400
It may or may not be "broken" as you put it. However, given the number of amplifiers with untuned inputs and the number of solid state transceivers that fold back unpredictably with such amplifiers
/archives//html/Amps/2010-05/msg00371.html (16,812 bytes)

66. Re: [Amps] FW: Bridging 120v loads across HV primary windings (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 03 Jun 2010 10:33:45 -0400
Not on your life! One never grounds the wiper of a variac (autotransformer). Connecting a 120 volt load between the center tap of a primary and one load line is EXACTLY like an autotransformer. Ther
/archives//html/Amps/2010-06/msg00041.html (10,018 bytes)

67. Re: [Amps] T/R Relays ? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sun, 06 Jun 2010 10:41:31 -0400
Be careful of the radio menu delays. In several instances, that delay tends to reduce (clip) the first element in CW. The Tohtsu relays are rated for 20 ms pull-in time but they have no specificatio
/archives//html/Amps/2010-06/msg00060.html (11,311 bytes)

68. Re: [Amps] 1 db compression point procedure ? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 01 Jul 2010 08:57:43 -0400
.... or the very high peak to average ratios of multi-carrier digital signals. 73, ... Joe, W4TV _______________________________________________ Amps mailing list Amps@contesting.com http://lists.co
/archives//html/Amps/2010-07/msg00004.html (11,113 bytes)

69. Re: [Amps] QSK-1500 chip (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 07 Jul 2010 20:17:35 -0400
Probably not. The QSK-1500 functioned only because of the specific properties of the MC14011BCP when used at U3B and C. It has been nearly 30 years now and I can't remember if the specific requireme
/archives//html/Amps/2010-07/msg00075.html (10,599 bytes)

70. Re: [Amps] QSK-1500 chip (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 07 Jul 2010 22:15:50 -0400
Jeff, I worked with John "Doc" Sheller (now K8RR) on the QSK-1500 some 30 years ago. I distinctly remember that the MC14011BCP requirement was added to the "service and technical manual" after the un
/archives//html/Amps/2010-07/msg00078.html (14,544 bytes)

71. Re: [Amps] Yaesu Quadra sockets (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 12 Jul 2010 23:53:44 -0400
There are SIX major contest bands and one only needs six antenna sockets if one has monoband antennas for all six bands. Most mere mortals have one or more multiband antennas or they use a remote (to
/archives//html/Amps/2010-07/msg00106.html (9,413 bytes)

72. Re: [Amps] for 2KL (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 06 Aug 2010 21:43:55 -0400
The 2KL was only a 500 W amplifier ... Icom moved along to the 4KL which was a 1 KW amplifier. The 4KL had four amplifier modules vs. two modules in the 2KL. The 4KL was replaced by the PW-1 which u
/archives//html/Amps/2010-08/msg00073.html (11,974 bytes)

73. Re: [Amps] Automotive Relays (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sun, 08 Aug 2010 10:44:45 -0400
Since the relays are arranged in a "tree" (one feeding two, each of which feeds two more) there are always three relays in line to each antenna. See: http://ameritron.com/man/pdf/RCS-10.pdf 73, ...
/archives//html/Amps/2010-08/msg00085.html (26,558 bytes)

74. Re: [Amps] How do you - powering a SS amp with a capacitor? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 09 Aug 2010 11:49:04 -0400
This only works with CW and unprocessed SSB. Heavily processed SSB and digital modes have a sufficiently high duty cycle (low peak to average ratio) that the capacitor is not able to completely char
/archives//html/Amps/2010-08/msg00118.html (11,223 bytes)

75. Re: [Amps] How do you - powering a SS amp with a capacitor? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 09 Aug 2010 15:22:35 -0400
A 300 V drop in a 2500V supply is less than 1.5% ... that's not even in the same league as a 2V drop (11.5V under load) for a 13.8V power supply. The IMD in a 100W transceiver on a Gamma supply make
/archives//html/Amps/2010-08/msg00124.html (14,831 bytes)

76. Re: [Amps] Why no images allowed? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 13 Aug 2010 15:49:52 -0400
I don't know that *.jpg are executable but since jpg are a compressed format they may well be used for "mischief." In any case, MailMan is a platform agnostic (multi-platform) text based e-mail forw
/archives//html/Amps/2010-08/msg00196.html (10,445 bytes)

77. Re: [Amps] Why no images allowed? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sat, 14 Aug 2010 20:14:22 -0400
Asked a question to which he should have already known the answer. That's agitation ... looking to cause a problem. 73, ... Joe, W4TV _______________________________________________ Amps mailing lis
/archives//html/Amps/2010-08/msg00202.html (8,670 bytes)

78. Re: [Amps] SB220 tune capacitor (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 18 Oct 2010 22:21:45 -0400
Yes, later SB220 had a higher voltage breakdown (wider space, more plates) capacitor that was longer. It generally came with a special end bracket for mounting the 10 meter coil. 73, ... Joe, W4TV _
/archives//html/Amps/2010-10/msg00286.html (8,900 bytes)

79. Re: [Amps] SB220 tune capacitor (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Tue, 19 Oct 2010 01:21:59 -0400
Martin, I had to do some review but now that I looked at some SB-220 pictures, it seems that what they did was use a threaded stand off between the tuning capacitor end of the 10 meter coil and the l
/archives//html/Amps/2010-10/msg00288.html (11,043 bytes)

80. Re: [Amps] TERMINATING Coax relay (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sat, 18 Dec 2010 21:19:24 -0500
Terminate the "unused" rig in a dummy load capable of handling full power from the rig. It's a matter of protection in case anything goes wrong and the unused rig is accidentally put in transmit! 73,
/archives//html/Amps/2010-12/msg00219.html (7,761 bytes)

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