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81. Re: [Amps]Bird 43 accuracy TSPA (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 8 Mar 2006 10:07:45 +0100 (CET); Now if instead of an anlogue meter, the Bird 43 had a digital readout to 3 places of decimals, people would believe it implicitly, because it would be digital......and digital read outs hide the diff; /archives//html/Amps/2006-03/msg00186.html (7,186 bytes)
82. Re: [Amps] mdc hv capacitors indentifcation (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 8 Mar 2006 15:14:30 +0100 (CET); Z5R dielectric drifts like Kon Tiki with temperature, so don't use them as tuning padders, only as bypass caps. For padders, you really NP0, but I don't know if there are many around in HV, high curr; /archives//html/Amps/2006-03/msg00195.html (7,244 bytes)
83. Re: [Amps] Bird accuracy, etc. (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 8 Mar 2006 17:04:51 +0100 (CET); Have you calibrated that? For Type Approval testing, many standards call for the measurement of power to +/-0.75dB for a measurement certainty of 95%. That's in a certifed laboratory, with traceable; /archives//html/Amps/2006-03/msg00201.html (7,951 bytes)
84. Re: [Amps] Pin Diodes (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 9 Mar 2006 12:47:32 +0100 (CET); Motorola claimed about 7 or 8 microseconds for their 1N4007. Now, I do not know if everyone else's 1N4007s are the same, and as generally, it doesn't matter for the 'correct' application, it may well; /archives//html/Amps/2006-03/msg00224.html (8,024 bytes)
85. Re: [Amps] Pin Diodes (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 10 Mar 2006 09:41:47 +0100 (CET); In the automatic test machines at work, they usually had to replace the electro mechanical RF attenuators about every 6 months or so - that was at about 1 million operations. Expensive business......; /archives//html/Amps/2006-03/msg00236.html (8,094 bytes)
86. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 11 Mar 2006 08:15:09 +0100 (CET); It does increase the effective series resistance. Rs=Rp/[1+(Rp/Rs)*2] 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/; /archives//html/Amps/2006-03/msg00264.html (8,072 bytes)
87. Re: [Amps] Band switching (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 12 Mar 2006 10:38:15 +0100 (CET); Jos asked: relays or PIN diode ?< The current is a bit high for PINs - it can easily hit 20amps. The voltage rating needs to be at least twice the HV, so we're talking something like 6kV and 20amps f; /archives//html/Amps/2006-03/msg00282.html (7,605 bytes)
88. Re: [Amps] RF probe and SSB (may be a little OT) (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 12 Mar 2006 10:59:19 +0100 (CET); the internet, but the plethora of knobs and buttons on the 475 has humbled me. To be honest, I have no idea what most of them do. I know I need a RF probe, but not sure if that is something easy to b; /archives//html/Amps/2006-03/msg00283.html (8,999 bytes)
89. Re: [Amps] Transformers in series (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 12 Mar 2006 22:55:41 +0100 (CET); If you have a spare set of contacts, consider using them to open across a series resistor. This works best on DC, where you can have a nice big capacitor charged up to cause closure of the relay, and; /archives//html/Amps/2006-03/msg00300.html (8,341 bytes)
90. Re: [Amps] Proof of idiocy (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 14 Mar 2006 08:51:45 +0100 (CET); Gary, 1/4 inch Whitworth (BSW) is 20 tpi. The nuts will fit a 1/4-20 UNC - the only difference is that BSW is a 55 degree thread, while UNC and UNF are 60 degrees (and thus are marginally weaker) 73; /archives//html/Amps/2006-03/msg00356.html (8,319 bytes)
91. Re: [Amps] Proof of idiocy (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 14 Mar 2006 08:55:29 +0100 (CET); 5/8-32 UNEF is a standard(it's the PL259 and N type thread) while Model Engineers thread standards are 32 and 40 tpi in various diameters with a Whitworth thread form. 3/8 -32 is usual for potentiome; /archives//html/Amps/2006-03/msg00357.html (7,969 bytes)
92. Re: [Amps] Threads - was idiocy - perhaps it still is (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 15 Mar 2006 09:12:23 +0100 (CET); Q; Why don't AMericans b drink beer? A: They haven't learnt how to make it yet! 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.conte; /archives//html/Amps/2006-03/msg00383.html (8,294 bytes)
93. Re: [Amps] Threads - was idiocy - perhaps it still is (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 15 Mar 2006 16:23:13 +0100 (CET); Stone's Brewery in San Diego North County produce a reasonable India Pale Ale - a type of brew originating from the UK. They have a good dark beer with 7.8% alcohol, which my colleagues there claim i; /archives//html/Amps/2006-03/msg00387.html (9,114 bytes)
94. Re: [Amps] CHASSIS (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 16 Mar 2006 10:04:22 +0100 (CET); The just post war ARRL handbooks had a lot of transmitters and so on built partially on wood, especially the use of 3/16 or 1/4 inch thick Presspahn for front panels. They even had a design for 19 in; /archives//html/Amps/2006-03/msg00435.html (7,347 bytes)
95. Re: [Amps] Unusual Solvent (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 18 Mar 2006 10:55:52 +0100 (CET); I remember my father telling me that in about 1951, one of the local hams doing military service abroad 'found' (how, I don't know) an SX28 (might have been a SX28A) that had been buried in sand some; /archives//html/Amps/2006-03/msg00529.html (7,464 bytes)
96. Re: [Amps] series-connecting a split-stator variable cap (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 20 Mar 2006 13:55:05 +0100 (CET); Besides either an insulated shaft or a good low capacity shaft coupler and a grounded metal shaft, if the capcitor is directly across the HV, something like 10 Megohm from rotor to ground. Otherwise,; /archives//html/Amps/2006-03/msg00560.html (8,250 bytes)
97. Re: [Amps] Tuned input board on SB-220 (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 25 Mar 2006 10:11:12 +0100 (CET); What is the rationale for the magic 13pF/metre? It works out as -j41....and please don't say 'because it's in Bill Orr's book!' 73 Peter G3RZP _______________________________________________ Amps mai; /archives//html/Amps/2006-03/msg00656.html (8,196 bytes)
98. Re: [Amps] Need some 220K 2 watt carbon resistors (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 27 Mar 2006 11:05:28 +0200 (CEST); film resistors instead. The carbon resistors drastically change value.< 220K could be a bit high for series capacitor equalisers, depending upon the leakage current of the capacitor. Even if they're; /archives//html/Amps/2006-03/msg00683.html (8,857 bytes)
99. Re: [Amps] rf choke on output (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 28 Mar 2006 10:32:48 +0200 (CEST); One function is to stop the pi tank components floating up towards the HV supply if there is no dc connection to ground. If you put two capacitors in series, then applying DC will lead to the junctio; /archives//html/Amps/2006-03/msg00698.html (7,396 bytes)
100. Re: [Amps] estimating the impedance of amp input and outputs? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 28 Mar 2006 17:35:02 +0200 (CEST); Dan asks example, if the collector of a 2N5109 is biased at 1000 Ohms and the emitter is DC biased at 500 Ohms and RF biased with a .005 uf is it reasonable to assume the output impedance is somewher; /archives//html/Amps/2006-03/msg00705.html (8,483 bytes)

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