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References: [ +from:dj7ww@t-online.de: 173 ]

Total 173 documents matching your query.

61. Re: [Amps] 4CX5000A in grounded-grid (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 18 Mar 2014 15:09:56 +0100
Hi Ron, The main air flow is through the anode by the large blower. That is quite common with VHF/UHF amplifiers in Europe. The cathode area is cooled by that separate fan. Of course the amp is mount
/archives//html/Amps/2014-03/msg00100.html (9,133 bytes)

62. Re: [Amps] 4CX5000A in grounded-grid (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 18 Mar 2014 16:08:41 +0100
Yes Ian, you are right. Pressurizing the anode compartment and let the hot air out through the anode chimney is the more common way. I saw that kind of cooling first time with a Lorenz UHF TV transla
/archives//html/Amps/2014-03/msg00103.html (12,090 bytes)

63. Re: [Amps] 4CX5000A in grounded-grid (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 18 Mar 2014 19:37:30 +0100
Don´t mix things up with highµ grounded grid designs! The 4CX5000A in that 2m amp is used with 1.2KV screen voltage and -300V grid voltage. The 4CX1000A with its zero watts grid dissipation works fla
/archives//html/Amps/2014-03/msg00106.html (12,221 bytes)

64. Re: [Amps] 3-400Z question (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Sun, 13 Apr 2014 23:22:23 +0200
Which modern runs that quiet? 73 Peter Sell them to someone with an old Henry and do something modern. Sent from my iPhone _______________________________________________ Amps mailing list Amps@conte
/archives//html/Amps/2014-04/msg00140.html (8,363 bytes)

65. Re: [Amps] Is this relay suitable for 1kw+ RF? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Thu, 17 Apr 2014 22:44:38 +0200
The open frame relays are suitable for that purpose, there no need at all for coaxial relays 73 Peter Nope. You need something like this: http://www.rfparts.com/relays/relays-coaxrelays/6350-6.html _
/archives//html/Amps/2014-04/msg00165.html (10,027 bytes)

66. Re: [Amps] GS-23B (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Sat, 16 Aug 2014 18:26:07 +0200
Yes, in a 70cm strip line linear. Is doing very well on that band. 73 Peter The GS-23B tetrode has anyone used one of these in a linear? Comments? Paul K0UYA _________________________________________
/archives//html/Amps/2014-08/msg00044.html (7,069 bytes)

67. Re: [Amps] low band PA (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Fri, 22 Aug 2014 20:51:58 +0200
That one is probably what you are looking for: http://www.mosfetpower.de/Baumappe%20Pa.pdf 73 Peter Hi! I did some googling on low band PA's using these SMPS fets. I am looking for a design for 160 a
/archives//html/Amps/2014-08/msg00053.html (7,706 bytes)

68. Re: [Amps] Drake L7 issue (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Sat, 27 Sep 2014 01:57:06 +0200
In Europe the proper connection is to 240V life wire and neutral and chassis ground to safety ground. 73 Peter Check your new 220 vac run. Sounds like you have a hot + neutral reversed at one end of
/archives//html/Amps/2014-09/msg00029.html (8,165 bytes)

69. Re: [Amps] Alpha 8410 using 4CX1500B - why? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Thu, 30 Oct 2014 00:50:04 +0100
Funny, most TV transmitters in Europe with combined sound and vision amplification have been with tetrodes in their final because of their high linearity. I never saw a commercial communication HF am
/archives//html/Amps/2014-10/msg00243.html (8,124 bytes)

70. Re: [Amps] Reducing heat in tetrode amps with EBS (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Fri, 31 Oct 2014 15:44:19 +0100
Now I understand that there is no money left to pay for the higher ZSAC of a tetrode amp ;-)) 73 Peter digital audio rack gear, I can delay the audio output, in 1 msec increments....from 0- 2000 msec
/archives//html/Amps/2014-10/msg00276.html (7,988 bytes)

71. Re: [Amps] Old Moto RF Decks (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Thu, 4 Dec 2014 01:33:59 +0100
The Tram family of broadcast AM/DRM transmitters by Transradio seem to have no IMD issues. They make use of adaptive pre distortion and use LDMOS, however not sure whether Freescale ore NPX hardware
/archives//html/Amps/2014-12/msg00017.html (10,582 bytes)

72. Re: [Amps] Linearization problem (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Thu, 4 Dec 2014 18:16:41 +0100
I use a bird sampler http://www.birdrf.com/Products/Components/Variable-Signal-Samplers/4273-Seri es_15-35-MHz-Variable-RF-Signal-Samplers.aspx 73 Peter Hi Manfred, Directional coupler. 73 & Good mor
/archives//html/Amps/2014-12/msg00024.html (12,283 bytes)

73. Re: [Amps] Linearization problem (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Fri, 5 Dec 2014 16:22:31 +0100
Yes it is just a sampler and very useful to provide the feed signal for pre distortion with the Hermes board or ANAN transceiver. But you might prefer to build up a DC6NY board. http://www.hamsdr.com
/archives//html/Amps/2014-12/msg00036.html (17,107 bytes)

74. Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Sun, 28 Dec 2014 05:18:00 +0100
The Eimac data sheet does not confirm that http://www.r-type.org/pdfs/4x150a.pdf The RCA 4X150A/7034 data does: http://pdf1.alldatasheet.com/datasheet-pdf/view/241849/ETC/7034-4X150A.html 73 Peter --
/archives//html/Amps/2014-12/msg00117.html (9,268 bytes)

75. Re: [Amps] Alpha Input SWR (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Sat, 10 Jan 2015 03:26:43 +0100
What is bad about SWR <2? 73 Peter Charly, Changing the length of coax to the input will not change the SWR. Look at a Smith Chart. Only dealing with the tube's capacitance along with the 50 ohm resi
/archives//html/Amps/2015-01/msg00011.html (9,403 bytes)

76. Re: [Amps] Multi-tube vs Single or Dual-tube amps? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Mon, 19 Jan 2015 23:25:23 +0100
I guess a 813 or 4-125 is cheaper 73 Peter common with sweep tubes, I think some with 4x150's, and 6146's. Other than the added sockets and wiring complexity are there additional down-sides to such a
/archives//html/Amps/2015-01/msg00152.html (9,023 bytes)

77. Re: [Amps] Multi-tube vs Single or Dual-tube amps? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 20 Jan 2015 13:31:37 +0100
No to all. I used cathode resistors 10 Ohm with all my multi parallel sweep tubes in the past like 14x PL36, 6x PL519, 6x 6DK6 etc. and just a single amp meter and bias pot. Also had 2x12 PL519 push
/archives//html/Amps/2015-01/msg00178.html (8,791 bytes)

78. Re: [Amps] Multi-tube vs Single or Dual-tube amps? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 20 Jan 2015 13:38:07 +0100
With an anode current of 2A at 1KV the output impedance will be around 250 ohms. 73 Peter --Original Message-- From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of donroden@hiwaay.net Sent: D
/archives//html/Amps/2015-01/msg00179.html (10,416 bytes)

79. Re: [Amps] push pull or parallel ? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Mon, 26 Jan 2015 18:43:54 +0100
What do you expect to gain with 3db more power when qsb on 160m is already much higher? And you don´t hear anything better when you go qro. 3db more gain with your antenna will be the biggest and pro
/archives//html/Amps/2015-01/msg00303.html (8,067 bytes)

80. Re: [Amps] {Collins} Understanding Screen Current in a Tetrode (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Wed, 28 Jan 2015 04:54:09 +0100
Tuning a tetrode amplifier for screen current maximum is correct. Tuning for the maximum screen current allowed by the manufacturer might be wrong if you like to stay within legal limit and use a lar
/archives//html/Amps/2015-01/msg00327.html (13,129 bytes)

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