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Total 96 documents matching your query.

81. Re: [Amps] 20kw Dummy load? (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Fri, 24 Sep 2004 01:05:35 +0200
over a may I was using length of RG141A/U connected to a smaller Bird dummyload, sunk both into a bathtub, works pretty well. Connectors are crimped N, did that with up to 6KW on a 70cm amp, RG141 w
/archives//html/Amps/2004-09/msg00433.html (8,412 bytes)

82. [Amps] Re: [CQ-Contest] Robots (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Tue, 28 Sep 2004 16:40:03 +0200
Cabrillo allows me accepted so the results and job in I totally agree on that. It is much better to be told by the robot for immediate trials and corrections then having the log unchecked with errors
/archives//html/Amps/2004-09/msg00470.html (7,243 bytes)

83. [Amps] Re: [Antennas] Antenna question (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Mon, 4 Oct 2004 19:07:27 +0200
S/S+N almost, it is SNR or S/N. And on small loops the signal AND the noise is smaller 73 Peter _______________________________________________ Amps mailing list Amps@contesting.com http://lists.cont
/archives//html/Amps/2004-10/msg00032.html (6,767 bytes)

84. Re: [Amps] Need for input tuning circuit (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Sat, 9 Oct 2004 22:37:45 +0200
standard current flow voltage) and key is up. running the Hi Vic, How was full class-C maintained on the opposite cycle, when no grid current flows? For full class-C the 813 has to be biased with -15
/archives//html/Amps/2004-10/msg00118.html (8,166 bytes)

85. Re: [Amps] Drake L4/L4-B tube replacement - 3-400Z or 3-500Z or3-500ZG (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Wed, 20 Oct 2004 13:12:42 +0200
3-500ZG for Hi Jason, the power-supply is the weakest part of the L4/L4-B followed by the bandswitch. With the original power supply you are limited in power, with an external power supply you are li
/archives//html/Amps/2004-10/msg00286.html (7,994 bytes)

86. Re: [Amps] 5 kw amps -- why? (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Thu, 21 Oct 2004 02:25:24 +0200
-- Original Message -- From: "R.Measures" <r@somis.org> To: "Peter Frenning, OZ1PIF" <oz1pif@privat.dk> Cc: "hermans" <on4kj@skynet.be>; <amps@contesting.com>; "'Rob Atkinson, K5UJ'" <k5uj@hotmail.co
/archives//html/Amps/2004-10/msg00344.html (10,170 bytes)

87. Re: [Amps] INRUSH (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Sun, 26 Dec 2004 22:37:41 +0100
exactly in my opinion the filter bank is too much oversized for a 3-phase powersupply even when no bridge rectifier is used and that caused the problem with the diodes. With a commercial tv transmitt
/archives//html/Amps/2004-12/msg00346.html (7,699 bytes)

88. [Amps] AL-1200 Mod (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Mon, 27 Dec 2004 12:11:55 +0100
A friend has trouble with his AL-1200 linear as his 3CX1200A7 failed. Will the russian GS-35B fit inside mechanically beside the necessary modifications to heater and bias supply? 73 Peter __________
/archives//html/Amps/2004-12/msg00352.html (6,261 bytes)

89. Re: [Amps] 8122 x 12 (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Wed, 29 Dec 2004 09:35:25 +0100
core) shortwave Hi Angel. It already IS for shortwave use, it is a wideband amplifier, so called distributed amplifier, or "Kettenverst&auml;rker" also often used as a driver for large amps It is a n
/archives//html/Amps/2004-12/msg00375.html (8,274 bytes)

90. Re: [Amps] Solid state amps (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Fri, 7 Jan 2005 23:21:14 +0100
the the power you do not need expensive mosfets for a linear and a big power supply, Overhere linears with about 30-40 cheap hexfets IRF-820 etc are quite popular, supplied by a transformerless switc
/archives//html/Amps/2005-01/msg00106.html (8,582 bytes)

91. Re: [Amps] Ferrite-loaded plate choke (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Sat, 8 Jan 2005 12:35:26 +0100
critical chokes, Hi Angel. Rohde&Schwarz did that in their amplifiers. For instance in their model SK-1, which I own, they use two chockes of 75 and 90&micro;H respectively while the latter is switch
/archives//html/Amps/2005-01/msg00125.html (7,745 bytes)

92. Re: [Amps] Ferrite-loaded plate choke (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Sun, 9 Jan 2005 19:28:54 +0100
"standard" RF choke with 4CX250's. effective impedance at the plate choke will be circa 50 ohms. I am using this latter method with a pair of 4CX600's in an amp currently under constuction. Hi Marv,
/archives//html/Amps/2005-01/msg00151.html (8,600 bytes)

93. Re: [Amps] Ferrite-loaded plate choke (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Mon, 10 Jan 2005 20:16:12 +0100
KOhm of the coil) of the pi-net which will be transformed to a low impedance as is the antenna connection. in the old link. Hi Marv, It was clear to me that I have the low impedance at the EHT feedpo
/archives//html/Amps/2005-01/msg00182.html (9,366 bytes)

94. Re: [Amps] Re: compact coils... (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Tue, 15 Feb 2005 15:23:19 +0100
conductor, 2.5" the the form, output if one approach reducing coil length could be this: http://www.pbase.com/df3kv/image/34219012/large 73 Peter _______________________________________________ Amps
/archives//html/Amps/2005-02/msg00529.html (7,733 bytes)

95. Re: [Amps] Re: compact coils... (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Tue, 15 Feb 2005 19:55:00 +0100
I remember an amp project in the ARRL handbook years ago which used several pieces of ferrite rod taped together and placed inside of one end of the tank coil to provide enough inductance for 80 mete
/archives//html/Amps/2005-02/msg00532.html (7,382 bytes)

96. [Amps] SB-220 Bandswitch (score: 1)
Author: "DF3KV" <df3kv@aol.com>
Date: Tue, 15 Feb 2005 22:02:26 +0100
I am going to Madeira next week for the CQ160 and ARRL SSB Contests at CT9L and heared that their SB-220 needs some overhaul. Probably contacts of the bandswitch have been toasted. Is there any sourc
/archives//html/Amps/2005-02/msg00536.html (7,606 bytes)

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