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Total 106 documents matching your query.

81. [AMPS] Directional coupler design (score: 1)
Author: bjk@ihug.co.nz (Barry Kirkwood)
Date: Fri, 1 Dec 2000 08:07:26 +1300
This is a multi-part message in MIME format. --=_NextPart_000_000E_01C05B6D.BE153E40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable RE: [AMPS] Directional
/archives//html/Amps/2000-11/msg00462.html (18,025 bytes)

82. [AMPS] G2DAF (score: 1)
Author: bjk@ihug.co.nz (Barry Kirkwood)
Date: Fri, 27 Oct 2000 09:55:47 +1300
Finding the G2DAF thread great entertainment. Never built one myself, but like lots of the guys, I was around when amateur SSB was being pioneered big time on the ham bands. Great days. Some observat
/archives//html/Amps/2000-10/msg00584.html (9,171 bytes)

83. Fw: [AMPS] G2DAF (score: 1)
Author: bjk@ihug.co.nz (Barry Kirkwood)
Date: Fri, 27 Oct 2000 14:10:29 +1300
end Barry Kirkwood PhD ZL1DD Signal Hill 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAND www.waiheke.co.nz/signal.htm -- Original Message -- From: Barry Kirkwood <bjk@ihug.co.nz> To: Randall
/archives//html/Amps/2000-10/msg00594.html (10,668 bytes)

84. [AMPS] G2DAF Amplifier etc. (score: 1)
Author: bjk@ihug.co.nz (Barry Kirkwood)
Date: Sun, 29 Oct 2000 08:57:33 +1300
FWIW The G2DAF design was featured in the 4th edition (1968) of the RSGB Handbook, did not appear in 5th of 1976 which showed a 2x813 gg job. Suggests the editors thought gg better practice. Neverthe
/archives//html/Amps/2000-10/msg00638.html (8,167 bytes)

85. [AMPS] Portable linear using a DAF? (score: 1)
Author: bjk@ihug.co.nz (Barry Kirkwood)
Date: Mon, 30 Oct 2000 07:36:00 +1300
Have wondered about this myself. A toroidal 230v-230v isolation transformer 500w CCS would not weigh too much. Voltage double/quadruple to sweep tubes. Series filaments with say 6 x PL509 to give 240
/archives//html/Amps/2000-10/msg00655.html (10,992 bytes)

86. [Amps] GU84 Socket (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Wed, 7 Jan 2004 02:41:18 -0000
I am looking for one off GU84 socket. Any guide to sources much appreciated. Suggest directing replies to me direct . Thanks and 73 Barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Roa
/archives//html/Amps/2004-01/msg00070.html (6,240 bytes)

87. Re: [Amps] Step start resistors (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Wed, 7 Jan 2004 20:57:39 -0000
Guess value of surge limiting resistor is an empirical question, start with high value, observe response on scope.... Thought : use of incandescent lamp as resistor. Understand that tungsten filament
/archives//html/Amps/2004-01/msg00080.html (11,626 bytes)

88. Re: [Amps] Re: Drake L7 newbie (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Fri, 26 Mar 2004 16:00:03 -0000
Am sure there is stuff on this in the Amps archives. Years back I had an L-4. The original power supply is feeble. Built it a new one giving around 3.3kV no load. Cannot remember the numbers, but out
/archives//html/Amps/2004-03/msg00287.html (11,363 bytes)

89. Fw: [Amps] one people, separated by a common language (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Mon, 26 Apr 2004 04:42:38 -0000
Heath Robinson was an English cartoonist and illustrator widely syndicated in the 20s, 30s and 40s. Typical cartoon showing "Professor Brainstawm" operating a weird device cobbled together to achieve
/archives//html/Amps/2004-04/msg00208.html (8,499 bytes)

90. Re: [Amps] Transformer frequency differences (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Sat, 22 May 2004 06:44:08 -0000
Presumably the input voltage was higher. 73 Barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAND ph/fax 64-9-372-5161 www.waiheke.co.nz/sign
/archives//html/Amps/2004-05/msg00196.html (7,872 bytes)

91. Re: [Amps] What to do with tubeless sweep tube FL2000 ? (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Sun, 27 Jun 2004 17:18:23 -0000
Somewhere there is a website giving details of substitution of single transmitting tube into FL series amp. 73 Barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke
/archives//html/Amps/2004-06/msg00133.html (9,973 bytes)

92. Re: [Amps] FL2100 (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Fri, 2 Jul 2004 03:40:47 -0000
May be dirty changeover relay. 73 Barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAND ph/fax 64-9-372-5161 www.waiheke.co.nz/signal.htm --
/archives//html/Amps/2004-07/msg00008.html (7,899 bytes)

93. Re: [Amps] Where to get Lg Zeners? (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Fri, 6 Aug 2004 05:14:36 -0000
wrap a power transistor around low watt zener to get desired rating. cheaper, better. 73 barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAN
/archives//html/Amps/2004-08/msg00048.html (8,054 bytes)

94. Re: [Amps] 20kw Dummy load? (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Sun, 15 Aug 2004 01:13:04 -0000
Carbon resistor and dry ice.....(or maybe it would turn into a superconductor) 73 Baz end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAND ph/fax
/archives//html/Amps/2004-08/msg00129.html (11,181 bytes)

95. Re: [Amps] Filtering capacitor in a HV PS (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Wed, 18 Aug 2004 19:19:18 -0000
With respect, this is out of the dark ages. Look for www.duncanamps.com ( I think). There you will find a computer programme that permits you to model any power supply you can visualise and check reg
/archives//html/Amps/2004-08/msg00208.html (10,535 bytes)

96. Re: [Amps] output ckts. (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Mon, 20 Sep 2004 02:00:03 -0000
National put out multiband tanks along lines of the Z match, covered 3.5-30 no switches. 73 Barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEA
/archives//html/Amps/2004-09/msg00343.html (9,144 bytes)

97. Re: [Amps] bias for 3cx3000 (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Mon, 4 Oct 2004 01:58:50 -0000
Stan, Sounds to me like you are overdetermining things a bit. Seems to me that if a suitable power transistor is placed in the cathode circuit, then the voltage drop across the pass transistor can be
/archives//html/Amps/2004-10/msg00027.html (9,119 bytes)

98. Re: [Amps] bias for 3cx3000 (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Tue, 5 Oct 2004 08:51:43 -0000
The original question, as I read it, was about a technique to set the bias for a power tube. A cheap and easy way to do this is to put a power transistor in series with the cathode, and vary the Vcb
/archives//html/Amps/2004-10/msg00045.html (10,199 bytes)

99. Re: [Amps] orphan amp? (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Fri, 8 Oct 2004 05:00:13 -0000
I have aViewstar PT2000A. Have run it very successfully for nearly 10 years. Has also been run by guest ops with no problems. Mainly CW contest work and hamming around. Bought it second hand. Problem
/archives//html/Amps/2004-10/msg00084.html (10,225 bytes)

100. Re: [Amps] orphan amp? (score: 1)
Author: "Barry Kirkwood" <bjk@ihug.co.nz>
Date: Fri, 8 Oct 2004 05:02:49 -0000
Originally built in Canada, design sold to US Company who manufactured for a while. I have Canadian job. 73 Barry end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Isl
/archives//html/Amps/2004-10/msg00085.html (8,285 bytes)

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