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61. [Amps] Muffin Fan on Swan Mark 1 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Fri, 26 Jul 2002 14:50:31 +0100; Rich, go wash your mouth out with beer! Such statements are heresy in todays world. You're obviously the awkward guy who when the storeman tells you that the computer says he hasn't got your widget i; /archives//html/Amps/2002-07/msg00492.html (9,107 bytes)
62. [Amps] 8877 Max Grid Current (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Fri, 21 Jun 2002 08:31:49 +0100; Rich's calculations are interesting. With these levels of grid current, how much heating of the grid is there because of the effects of skin resistance? I admit I haven't done the calculation, but in; /archives//html/Amps/2002-06/msg00171.html (8,089 bytes)
63. [Amps] 8877 Max Grid Current (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Fri, 21 Jun 2002 13:13:16 +0100; well, the skin depth at 144 is .216 mil (i.e. .000216 inches). The gold flash is probably a few microinches, so there's the base grid material to consider, and its resistance - that's going to domina; /archives//html/Amps/2002-06/msg00176.html (8,751 bytes)
64. [Amps] triband/warc interaction: G3JVC (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 13 May 2002 13:27:25 +0100; I run a 20m monobander about 6 or 8 feet below a 4 ele for 10 interlaced witha 4 ele for 15. Don't seem to do too badly - the T24 came back first call on 15 last Saturday morning. Still need KP1 and; /archives//html/Amps/2002-05/msg00162.html (6,655 bytes)
65. [Amps] Non-linear subharmonics was: Nonsense, AL-1500 parasitic (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 20 May 2002 17:15:31 +0100; I've been in Sweden (again!) last week, so have only followed this from afar....... Frequency dividers using 'linear' parts are quite old. The simplest of them uses an amplifier at the divided freque; /archives//html/Amps/2002-05/msg00312.html (8,798 bytes)
66. [Amps] resistors (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 21 May 2002 13:38:07 +0100; Carbon comp resistors slowly change value even when they're MIL types, unused, still in MIL sealed packaging. At 1000 volts, the change is rather faster. I'm pretty leary about using standard carbon; /archives//html/Amps/2002-05/msg00328.html (7,996 bytes)
67. [Amps] Homemade attenuator or sampler for 1+kW? (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Thu, 23 May 2002 11:50:30 +0100; I made a directional coupler. I used the 'Wainwright' 50 ohm strips - these are strips of PC board with the the correct width of track for 50 ohms and with glue on the back - and stuck them to a shee; /archives//html/Amps/2002-05/msg00369.html (8,184 bytes)
68. [Amps] Tube question (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Thu, 23 May 2002 13:32:05 +0100; maybe these tubes are a bit small for this reflector but..... What's the difference between a 6SJ7 and 6SJ7Y? Similarly, between the 6SB7 and 6SB7Y, and again, the 6SG7 and its Y version? 73 Peter G3; /archives//html/Amps/2002-05/msg00374.html (6,496 bytes)
69. [Amps] Using door knob caps as padders/blockers (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Thu, 23 May 2002 13:43:49 +0100; It is arguable that if the capacitors get hot, they are being used above their current rating. The question then arises as to what service the amplifier is intended for - just like the sweep tube amp; /archives//html/Amps/2002-05/msg00375.html (7,965 bytes)
70. [Amps] Homemade attenuator or sampler for 1+kW? (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Fri, 24 May 2002 08:09:45 +0100; I think you would have to watch the rating of the 778D terminating resistors - that's probably where the limitation occurs. 73 Peter G3RZP; /archives//html/Amps/2002-05/msg00405.html (7,741 bytes)
71. [Amps] Re: IMD (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 2 Apr 2002 09:17:31 +0100; At least Rich was going the right way.....some years back, a radio club over here doing 2m contests wanted to reduce the drive to the amplifier on 2 metres from the transceiver, so they wound down th; /archives//html/Amps/2002-04/msg00059.html (6,985 bytes)
72. [Amps] rotten splatter/ IMD vs. Vcc (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 2 Apr 2002 15:14:48 +0100; I can confirm the FT102 is fairly good on IMD - at least, mine is. It's got RF NFB on the 6146Bs. For no reason that I can explain, it's also very good on phase noise, too, although it does have a lo; /archives//html/Amps/2002-04/msg00066.html (7,933 bytes)
73. [Amps] Filament/heater life (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 2 Apr 2002 16:05:19 +0100; Has anyone any hard information (as opposed to rumour, surmise, etc) as to whether or not running heaters/ filaments of bigger tubes (60 watts or more of heater/filament power) on DC has a deleteriou; /archives//html/Amps/2002-04/msg00069.html (6,520 bytes)
74. [Amps] IMD vs. Vcc (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 2 Apr 2002 16:16:15 +0100; However, there are some limits in the ITU-R Recommendations, which are incorporated into the Radio Regulations. These haven't been translated into FCC Rules - which is a bit strange, since the US sig; /archives//html/Amps/2002-04/msg00071.html (8,207 bytes)
75. [Amps] Re: 12V 120A Switching Power supply? (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 3 Apr 2002 07:42:26 +0100; Not only power supplies give problems.........some years ago, we were involved with Part 15 Type Approval: the equipment was to work with a laptop, and a very well known Japanese make of laptop radia; /archives//html/Amps/2002-04/msg00106.html (8,225 bytes)
76. [Amps] Re: [Amps] Bird. 43 Manual (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 3 Apr 2002 13:54:49 +0100; Another way of analysing it is an AC bridge. But as Tom (and others) have said, without the capacitive coupling, it doesn't work - at least, not as a wattmeter. A point was made about directivity. So; /archives//html/Amps/2002-04/msg00111.html (6,943 bytes)
77. [Amps] Re: [Amps] BirdR 43 Manual (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 3 Apr 2002 17:08:50 +0100; I believe they are around $70 a pop from Bird. I used a 1mA meter and an op amp: I photocopied the original meter scale, and put that on the new meter. If you have the DC available, it's much cheaper; /archives//html/Amps/2002-04/msg00123.html (6,817 bytes)
78. [Amps] RG-174 power handling capacity (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Thu, 4 Apr 2002 13:12:02 +0100; According to the Suhner catalogue, RG174 is good for 150 watts at 30MHz when matched, with a loss of 15dB/100metres at that frequency. Power handling goes up as a straight line on a log frequency/lin; /archives//html/Amps/2002-04/msg00143.html (7,634 bytes)
79. [Amps] Re: [Amps] Re: [Amps] Re: [Amps] Re: [Amps] BirdR 43 Manual (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Fri, 5 Apr 2002 07:31:52 +0100; If the outer is disconnected, there's no current flow in it, so how does it maintain the impedance? I believe that you use the coax to provide electrostatic shielding to prevent capacitive pick up. 7; /archives//html/Amps/2002-04/msg00168.html (7,294 bytes)
80. [Amps] TS-440S Update (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 15 Apr 2002 07:41:17 +0100; Did anyone say otherwise? Trouble is Rich, the idea of having a cleaner signal is fine, but one is a bit of a lone voice compared with the 'wind it full clockwise' brigade. Still, we have the satisfa; /archives//html/Amps/2002-04/msg00352.html (7,613 bytes)

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