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

Total 172 documents matching your query.

1. Re: [Amps] 2010 Handbook (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Wed, 17 Nov 2010 23:22:54 +0100
The 4CX1500B is not good for 2600W out, that is almost the input power limitation. 1600-1700W out will be fine. 3KV and 0.9A is their limit on the anode. The 4CX1000A in theory does more power, their
/archives//html/Amps/2010-11/msg00317.html (8,543 bytes)

2. Re: [Amps] Plated screws (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Fri, 19 Nov 2010 11:56:11 +0100
You will find out quickly if you use them to connect copper straps to coils or band switches or elsewhere in rf fields. In inductive ovens the same "eddy current" works quite effective 73 Peter --Ori
/archives//html/Amps/2010-11/msg00348.html (8,199 bytes)

3. Re: [Amps] brass or BNP hardware (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Tue, 23 Nov 2010 16:58:41 +0100
Only if the tube specifications are far exceeded. 3x 4-400 will do the same then. 73 Peter I just serviced a LK-800C and discovered 6-32 steel hardware in the RF path on both sides of the plate block
/archives//html/Amps/2010-11/msg00391.html (7,778 bytes)

4. Re: [Amps] brass or BNP hardware (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Tue, 23 Nov 2010 18:22:45 +0100
I got both data sheets. My saying is that specifications are far exceeded when 3x 3CX800A7 tubes are run at 4KW out, not how far they can be pushed before the big bang happens. The problem is the ano
/archives//html/Amps/2010-11/msg00396.html (11,029 bytes)

5. Re: [Amps] brass or BNP hardware (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Tue, 23 Nov 2010 18:37:24 +0100
The mentioned 4-125 was always white and I never had to change the tube. It sat in a modified HT41 chassis. Later I added a second tube and returned the anode voltage from 4KV to 2KV, switched back f
/archives//html/Amps/2010-11/msg00398.html (8,406 bytes)

6. Re: [Amps] brass or BNP hardware (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Tue, 23 Nov 2010 18:46:14 +0100
Yes, I know. 3 are sitting in my LK800-A with an external 3ph p/s. Unfortunately my source for MRI tubes is using the 3CPX1500A7 but just the standard 3CX800A7. 73 Peter No company uses the 3CX800A7
/archives//html/Amps/2010-11/msg00399.html (13,132 bytes)

7. Re: [Amps] Tube Cooling.. (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Wed, 24 Nov 2010 05:10:06 +0100
A friend of mine is running three GS31b (similar coolers) in parallel and uses three overhead mounted EBM Papst muffin fans to suck the hot air out. Another single small fan cools the cathode aerea.
/archives//html/Amps/2010-11/msg00410.html (13,014 bytes)

8. Re: [Amps] Tube Cooling.. (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Sat, 27 Nov 2010 18:52:48 +0100
All commercial cavity amps I saw, made by Siemens, R&S and Plisch provide cooling a different way. They pressurize the cavity with the blower and the only way for the air to escape is through the ano
/archives//html/Amps/2010-11/msg00514.html (9,885 bytes)

9. Re: [Amps] Band switch (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Sat, 11 Dec 2010 19:20:57 +0100
As far I know all Henry amps made use of roller inductors 73 Peter Hsu, those multi deck band switches bring hot RF carrying wires from the hi-power tank circuits, close together which is not desirab
/archives//html/Amps/2010-12/msg00105.html (8,136 bytes)

10. Re: [Amps] Band switch (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Sun, 12 Dec 2010 01:05:30 +0100
Then I guess it contains a band switch. 73 Peter The 2K4 didn't. 73 Roger (K8RI) radio, the solenoids _______________________________________________ Amps mailing list Amps@contesting.com http://list
/archives//html/Amps/2010-12/msg00119.html (10,085 bytes)

11. Re: [Amps] A Filament Query (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Sat, 15 Jan 2011 00:16:47 +0100
What I saw on a commercial amp with 8171 (nominal heater voltage 7.5V), they drop the heater voltage to 6.9V volts on standby and raise it to 7.5V with HT ON for transmit. 73 Peter voltage right at t
/archives//html/Amps/2011-01/msg00144.html (9,343 bytes)

12. Re: [Amps] I answered it. (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Sun, 30 Jan 2011 04:40:52 +0100
It is more then likely that those on a city lot who crank their power output way up will run into trouble with their neighborhood. 73 Peter will not be noticeable. good. [ a full size 40m yagi is onl
/archives//html/Amps/2011-01/msg00414.html (9,449 bytes)

13. Re: [Amps] I answered it. (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Sun, 30 Jan 2011 06:31:45 +0100
Jim is talking about "power way up", 3-6db above legal limit. 73 Peter output I shouldn't say this out loud as it might jinx the operation, but I've run the legal limit or close to it for most of the
/archives//html/Amps/2011-01/msg00419.html (12,166 bytes)

14. Re: [Amps] What to buy? (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Sun, 30 Jan 2011 16:58:13 +0100
I repaired the Command 2500 of a friend twice. Both times burned toroids. Next time I visited him I saw the reason, he drove the amp to 3KW PEP output. 73 Peter ORIGINAL MESSAGE: REPLY: Maybe, maybe
/archives//html/Amps/2011-01/msg00429.html (10,317 bytes)

15. Re: [Amps] 'heat spreader' sizing ?? (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Tue, 15 Feb 2011 18:15:20 +0100
I guess the 200W out are at 8MHz transmit bandwith with multiple carriers and low efficiency. 73 Peter "Typical pulsed performance at frequency of 225 MHz, a supply voltage of 50 V and an IDq of 40 m
/archives//html/Amps/2011-02/msg00124.html (10,445 bytes)

16. Re: [Amps] door knob capacitors (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Sun, 27 Feb 2011 20:23:57 +0100
Why do you want at least a 10KV rating while the capacitors will not see more then 500V? More important is to select a RF doorknob with low TCC. 73 Peter I need either a 1000 pf or two 500 pf door kn
/archives//html/Amps/2011-02/msg00197.html (8,530 bytes)

17. Re: [Amps] Look at this Custom 10kW Amp (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Fri, 12 Apr 2013 19:26:05 +0200
No, the amount of field strength near the equipment is responsible for RFI. And by the way, an antenna is no RF amplifier. 73 Peter The biggest cause of rfi it turns out is the use of lousy baluns at
/archives//html/Amps/2013-04/msg00090.html (8,228 bytes)

18. Re: [Amps] Look at this Custom 10kW Amp (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Fri, 12 Apr 2013 21:27:35 +0200
Would be nice to be able to produce energy out of nothing. The sum of all the energies in the system is a constant. 73 Peter Gosh I have a different take on the abt being an amp. It certainly does am
/archives//html/Amps/2013-04/msg00091.html (9,542 bytes)

19. Re: [Amps] Tuned input design / measurement questions (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 16 Apr 2013 19:15:05 +0200
The RF cathode current is anode RF current + grid RF current. The return path imho for it is through the input impedance and chassis ground, not through the transceiver. 73 Peter If you don't have a
/archives//html/Amps/2013-04/msg00127.html (7,497 bytes)

20. Re: [Amps] Tuned input design / measurement questions (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Wed, 17 Apr 2013 12:53:42 +0200
Jim, that is the path of the RF driving power. 73 Peter The C2 cap in any PI tuned input is the return for the rf cathode current. Without the tuned input, the only other path is via the braid of coa
/archives//html/Amps/2013-04/msg00153.html (8,540 bytes)

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