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References: [ +from:dj7ww@t-online.de: 172 ]

Total 172 documents matching your query.

101. Re: [Amps] RF2K+ LDMOS linear (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Mon, 5 Jun 2017 00:03:08 +0200
Itīs done, with 4x BLF188 https://www.qrz.com/lookup/Dj5DM 73 Peter, DJ7WW While it is interesting that flow soldering the LDMOS to the copper spreader (requires temps to 400F (200C)) does not appear
/archives//html/Amps/2017-06/msg00026.html (8,530 bytes)

102. Re: [Amps] Ferrite Core for 160M PI Output ? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Mon, 12 Jun 2017 01:10:12 +0200
Indeed, this pp amp with GU81 runs with 3.5KV on the anodes: http://www.pbase.com/df3kv/image/86725410/original 73 Peter, DJ7WW With Teflon insulated wire and Scotch 27 tape between windings probably
/archives//html/Amps/2017-06/msg00176.html (10,532 bytes)

103. Re: [Amps] Ferrite Core for 160M PI Output ? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Mon, 12 Jun 2017 21:17:36 +0200
Kapton is great, I use a layer of self-adhesive tape on my anode chokes as well. 73 Peter, DJ7WW Insulation. Never tried Kapton. -- This email has been checked for viruses by AVG. http://www.avg.com
/archives//html/Amps/2017-06/msg00189.html (9,867 bytes)

104. Re: [Amps] Ferrite Core for 160M PI Output ? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 13 Jun 2017 16:45:15 +0200
When I use multiple cores I glue them together with two component epoxy first and then I insulate and wind them, much easier. 73 Peter <I understand insulating between the wire and the core, but why
/archives//html/Amps/2017-06/msg00194.html (10,638 bytes)

105. Re: [Amps] Ferrite Core for 160M PI Output ? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 13 Jun 2017 17:28:03 +0200
Hi Chris, The builder and owner of the amp is sk, so I donīt know if the amp is still in use. But when he built it we where in close contact and I suggested the cores to him. The material is close to
/archives//html/Amps/2017-06/msg00196.html (10,489 bytes)

106. Re: [Amps] Ferrite Core for 160M PI Output ? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 13 Jun 2017 19:41:16 +0200
Yes, I know. He used a relative low Q parallel tank circuit on 136kHz. Output was about 2KW. 73 Peter, DJ7WW Hi Peter PI network loss is related with the Q of the inductor, you need material #2 or #6
/archives//html/Amps/2017-06/msg00201.html (11,533 bytes)

107. Re: [Amps] peak voltage rating for load cap (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Sat, 19 Aug 2017 15:29:38 +0200
Letīs say the SWR is 3 then the load might be 150 ohms. The peak voltage across the load capacitor will be 775V at 2KW. That is sqrt3 higher then at SWR1. 73 Peter That will give you average (RMS) vo
/archives//html/Amps/2017-08/msg00022.html (7,773 bytes)

108. Re: [Amps] peak voltage rating for load cap (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Sat, 19 Aug 2017 19:59:43 +0200
The Russians doorknob capacitors do well. Check Kevins page on qrz.com: https://www.qrz.com/db/VK4AKV/ DL6EAT is using them with 8x MRF157 on Kevinīs board. 73 Peter, DJ7WW --Original Message-- From:
/archives//html/Amps/2017-08/msg00030.html (10,386 bytes)

109. Re: [Amps] Negative feedback passive input tetrode (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Fri, 15 Dec 2017 13:41:34 +0100
I use a 12 ohm resistor in the cathode lead of my 4CX600J 73 Peter I just had a thought. Has anyone see or used negative feedback to better obtain lower IMD in a passive (resistor terminated) input t
/archives//html/Amps/2017-12/msg00111.html (8,214 bytes)

110. Re: [Amps] Defining CCS (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Sun, 31 Dec 2017 19:36:32 +0100
Steve, Communication in this case means to communicate with the members of this group. I built several amps to be run ccs. If IMD is nonsense try to run your rig at -10 IMD3 and have fun. 73 Peter --
/archives//html/Amps/2017-12/msg00200.html (8,162 bytes)

111. Re: [Amps] Series C in amp output (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Wed, 14 Feb 2018 17:16:24 +0100
I guess itīs not for safety but for the qsk circuitry.īIn my amp I did something similar. It would not work with a dc short from a beta match or similar on the antenna output. The closing of the ante
/archives//html/Amps/2018-02/msg00026.html (10,635 bytes)

112. Re: [Amps] PASSIVE NEWORK CATHODE INPUT (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Wed, 19 Sep 2018 02:03:09 +0200
Of course it works on the GS35b and also flawless on Henrys 8K ultra. With 3KV on the GS35 anode gain is slightly more then 11dB. 73 Peter --Original Message-- From: Amps [mailto:amps-bounces@contest
/archives//html/Amps/2018-09/msg00018.html (6,885 bytes)

113. Re: [Amps] PASSIVE NEWORK CATHODE INPUT (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Sat, 22 Sep 2018 20:10:49 +0200
I donīt see a resaon for it. And I make no use of it with my GG amps. I donīt use a passive input neither with GG amps, only with grid driven tetrodes. 73 Peter wont provide that. ___________________
/archives//html/Amps/2018-09/msg00024.html (7,670 bytes)

114. Re: [Amps] PASSIVE NEWORK CATHODE INPUT (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Mon, 24 Sep 2018 15:28:38 +0200
I use only SS transceivers myself as well as other users of amps which I had my hands on. The return path for the RF current is closed already via the cable capacitance between linear and transceiver
/archives//html/Amps/2018-09/msg00031.html (9,635 bytes)

115. Re: [Amps] stuff forsale! (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 16 Oct 2018 20:42:27 +0200
You will need much less cross section for the coil if you build the tank as a Pi-L circuit. With far less RF current trough the coil you get the same or better harmonic suppression. Pi-L is ideal for
/archives//html/Amps/2018-10/msg00056.html (8,751 bytes)

116. Re: [Amps] High temp magnet wire? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Mon, 3 Dec 2018 18:20:22 +0100
Will become extremely hot when positioned next to a pair of 4-1000A or similar. 73 Peter, DJ7WW <Looking for #20 high temperature magnet wire - sometimes referred to as <Thermaleze. <Any ideas? <Need
/archives//html/Amps/2018-12/msg00008.html (8,085 bytes)

117. Re: [Amps] High temp magnet wire? (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Mon, 10 Dec 2018 17:11:57 +0100
I tried that choke in my 3x 4-400 amplifier, it immediately went up in smoke on 17m. 73 Peter, DJ7WW <<<Would like to see that. Is it piblished somewhere? <Manfred Scroll to the bottom to see his VNA
/archives//html/Amps/2018-12/msg00074.html (9,064 bytes)

118. Re: [Amps] Question about grid current in 4CX or 3CX (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Mon, 18 Mar 2019 09:19:36 +0100
Hi Don, The grid dissipation of the 4CX10000D is 75W. It takes 150W of drive for 250mA of grid current with that tube in class-c with anode and screen voltage supplied. Are you thinking of a differen
/archives//html/Amps/2019-03/msg00034.html (8,205 bytes)

119. Re: [Amps] QRO 2500DX MARK lll 4CX800 (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Thu, 4 Apr 2019 20:21:46 +0200
All Apache Labs transceivers with dual receivers provide pure signal capability as well as the Hermes SDR and Red Pitaya SDRs. ADAT ADT-200 does it as well as few others. You canīt get -59dB IMD-3 tw
/archives//html/Amps/2019-04/msg00019.html (10,368 bytes)

120. Re: [Amps] QRO 2500DX MARK lll 4CX800 (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Thu, 4 Apr 2019 19:32:22 +0200
What new production run? DX Engineering says "Equivalent to 4CX800A", a 4CX800A never existed. And plate dissipation is 600W, not 800W. 73 Peter These are from a new production run by Svetlana and th
/archives//html/Amps/2019-04/msg00021.html (11,840 bytes)

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