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References: [ +from:df3kv@t-online.de: 314 ]

Total 314 documents matching your query.

101. Re: [Amps] Boycott New Chinese linear Amplifier (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 5 Oct 2006 00:49:29 +0200
Another spoof, or just kidding? I suggest you list the individual(s) who are no longer welcome here. Just in case... 73 Peter I suspect the group will see quite a bit of that kind of childish behavio
/archives//html/Amps/2006-10/msg00031.html (7,694 bytes)

102. Re: [Amps] Glued meters ! (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 5 Oct 2006 01:30:33 +0200
The meters in the Tentec Titan were always glued, but no idea of their newer designs. Hsu did not talk about glued meters in AL811s either 73 Peter If you read later posts, Hsu then said it **wasn't
/archives//html/Amps/2006-10/msg00035.html (8,289 bytes)

103. Re: [Amps] 3CPX vs 3CX tubes (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 21 Oct 2006 14:29:01 +0200
Not only that, it is also too big and heavy for the relatively small power it does, it needs the same space as the 3CX3000A7 73 Peter I have used the GS-35B a couple of times, the tube is rugged and
/archives//html/Amps/2006-10/msg00227.html (7,363 bytes)

104. Re: [Amps] Class C amp for RTTY contesting... (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 2 Nov 2006 21:59:13 +0100
Hi Bob, That will only work if you do FSK. None of the mentioned amps is really suitable for class C operation. You probably will have not enough drive in GG class C and the output and input circuits
/archives//html/Amps/2006-11/msg00041.html (8,065 bytes)

105. Re: [Amps] 4CX1500 class AB1 vs. AB2 (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 3 Nov 2006 01:48:21 +0100
use of a small LED with an optocoupled ALC circuit? 73 Peter The question still remains, how do you protect the grid of a 4CX type tube from excess grid current with a stiff bias supply? ____________
/archives//html/Amps/2006-11/msg00047.html (8,467 bytes)

106. Re: [Amps] pi filter QBL 5/3500 (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Mon, 6 Nov 2006 20:38:10 +0100
Hi Bob, His output impedance will be slightly above 3 kohms. So 300pf are plenty on 80m, also on 160m when his Q is not higher then 10 it will be fine as strays add to it. But with high impedance a h
/archives//html/Amps/2006-11/msg00091.html (10,265 bytes)

107. Re: [Amps] Russian power L-coupler (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 17 Nov 2006 17:20:45 +0100
My first TRX in 1963 was a Wireless Set No.19 MkIII equipped with the 807 in the final. That radio also used a variometer as an ATU, it was a very quick and reliable means of coupling random wires or
/archives//html/Amps/2006-11/msg00217.html (9,096 bytes)

108. Re: [Amps] W2ONV's Amp for sale on eBay (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Mon, 11 Dec 2006 23:39:24 +0100
Hi Bob, I guess Bill had several tubes. One 4CX10000J+socket was brought from him to me by Karl, DJ8RR 20 years ago. It is working perfectly 73 Peter Check this auction out. The schematic identifies
/archives//html/Amps/2006-12/msg00071.html (8,575 bytes)

109. Re: [Amps] W2ONV's Amp for sale on eBay (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Mon, 11 Dec 2006 23:42:04 +0100
The B&W inductor is on the grid circuit, the tank coil is Johnson 73 Peter (The original parts of) that amp look really, really, really old. 1950s or early 60s? The partial schematic shows it uses on
/archives//html/Amps/2006-12/msg00072.html (7,440 bytes)

110. Re: [Amps] QST (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 19 Dec 2006 19:48:38 +0100
Tom, when did that article appear? I have the CDs 73 Peter I don't think that article was all that bad. It had significantly fewer mistakes and more accurate technical advice than the "Nearly Perfect
/archives//html/Amps/2006-12/msg00175.html (7,209 bytes)

111. Re: [Amps] power supply transformer (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 4 Feb 2007 13:00:57 +0100
Direct rectified power supplies will not work with a GFCI, as the neutral and safety ground must be always bonded together. On a correctly built direct rectified power supply there will be ALWAYS neu
/archives//html/Amps/2007-02/msg00029.html (8,171 bytes)

112. Re: [Amps] 1 tube or two ?? (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 11 Feb 2007 18:47:10 +0100
I imagine the two holer was built to run the ham limit. If you inspect the Pi values and calculate back, you will see for what power level they are constructed. The drive requirement will be lower wi
/archives//html/Amps/2007-02/msg00181.html (8,457 bytes)

113. Re: [Amps] 1 tube or two ?? (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 11 Feb 2007 18:50:04 +0100
Sorry, misst the word "not" in my first sentence ;-)) I imagine the two holer was built to run the ham limit. _______________________________________________ Amps mailing list Amps@contesting.com htt
/archives//html/Amps/2007-02/msg00182.html (7,375 bytes)

114. Re: [Amps] 1 tube or two ?? (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 11 Feb 2007 20:49:46 +0100
Both version can provide 1500W and advantages/disdvantages were already answered. Its clear visible in the datasheet. But, if the amplifiers are not designed for 1500W output they will not work as ex
/archives//html/Amps/2007-02/msg00188.html (8,261 bytes)

115. Re: [Amps] Alligators (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Mon, 5 Mar 2007 22:29:06 +0100
Hi Jim, What receive antenna do you suggest to suppress S9+ qrm in Europe? 3dbs +/- in power will not make a difference at all, but loacation and antennas do 10db+ easily. You should come over and tr
/archives//html/Amps/2007-03/msg00085.html (7,696 bytes)

116. Re: [Amps] Alligators (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Mon, 5 Mar 2007 23:47:56 +0100
Hi Jim, I do not think that K9AY loops are of any help on 20m, there I prefer yagis which are quite useful to supress qrm from some directions. Most are using groundplanes or dipoles here as the have
/archives//html/Amps/2007-03/msg00096.html (9,562 bytes)

117. Re: [Amps] AMP Reflector Quality of Information (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 20 Mar 2007 21:55:36 +0100
Where can I read the full reflector policy? Just in case... Don&acute;t like to be kicked off without knowing why. The policy on contesting.com is obviously incomplete since "discussion of reflector
/archives//html/Amps/2007-03/msg00264.html (8,914 bytes)

118. Re: [Amps] Pi-L Network (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Wed, 28 Mar 2007 15:41:17 +0200
Would be very interesting. And the Pi-L IS better then the Pi on harmonic suppression. I use it in all my monoband amps. 73 Peter Claude: what is your technique? Could you post it for us? If it is a
/archives//html/Amps/2007-03/msg00372.html (7,758 bytes)

119. Re: [Amps] Pi-L Network (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 29 Mar 2007 02:02:31 +0200
In the minimum I got 6db improvement, it depends also on the output impedance and layout of the components. I gained 10db more at high output impedance. Most are 1000-1500 ohms, 160m is 3 kohm. Befor
/archives//html/Amps/2007-03/msg00380.html (8,986 bytes)

120. Re: [Amps] Pi-L Network (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 29 Mar 2007 12:41:54 +0200
On my 160m amp the improvement is 12db, beside the much better bandwith on that wide band without need for retuning. 73 Peter Thinking of it as a low pass filter, going from three elements to four I'
/archives//html/Amps/2007-03/msg00388.html (8,880 bytes)

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