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21. Re: [Amps] 76ca (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Thu, 10 Sep 2009 10:32:07 +0900; Hi Wayne san and all in this thread Thanks for six meter QSOs on 2008 season. Its a time for maintenance. I think a basic function of plate suppressor is to provide low impedance at fundamental frequ; /archives//html/Amps/2009-09/msg00140.html (8,099 bytes)
22. Re: [Amps] Watts to DBM?? (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Fri, 25 Sep 2009 18:38:46 +0900; hi Andy 1W = 0 dBW = 1000mW = 30 dBm A [dBm] = 10 x log (P) where P is power in milliwatts. P [mW] = 10^(A/10) = (A/10)th power of ten whare A is power in dBm. 3 dBm = 10^0.3 = approx 2 mW 10 dBm = 1; /archives//html/Amps/2009-09/msg00305.html (8,130 bytes)
23. Re: [Amps] PEP Reading Wattmeter (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Fri, 2 Oct 2009 10:29:49 +0900; Hi Dick and all. I am using Bird 43 + home brew PEP kit + tracking power supply. Using a sequence of fastest CW dots, a PEP power meter and an old 8894 dummy load I can evaluate a performance of my h; /archives//html/Amps/2009-10/msg00014.html (9,403 bytes)
24. Re: [Amps] Bird 43 Meter Repair Query (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Mon, 5 Oct 2009 14:47:33 +0900; Thanks Bill. I am using three pieces of Scotch-tape between outer surface of the glass and the meter enclosure on every 120 degrees. de Han JE1BMJ _______________________________________________ Amps; /archives//html/Amps/2009-10/msg00080.html (7,589 bytes)
25. Re: [Amps] filament choke questions (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Thu, 8 Oct 2009 13:59:07 +0900; Hi Paul Just have survived strong wind of typhoon 18 here. The purpose of the filament choke for 3CX800A7 is, to keep filament's RF potential neutral, to avoid a breakdown of cathode-heater insulatio; /archives//html/Amps/2009-10/msg00133.html (8,912 bytes)
26. Re: [Amps] Tuned Input for G-G 50Mhz amp (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Thu, 25 Mar 2010 10:19:35 +0900; hi all, In the book "Linear amplifier design book for radio amateur" by Eimac I found "nominal input impedance of 3-400Z is 122 ohms". I also found "A 2 Kilowatt 3-400Z Linear for six meters" by Will; /archives//html/Amps/2010-03/msg00593.html (9,411 bytes)
27. Re: [Amps] Tuned Input for G-G 50Mhz amp (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Thu, 25 Mar 2010 11:09:13 +0900; I have obtained it in the Yahoo Auction. It is consist of 146 pages of blue print. Maybe it have been published on early 1970s... How can I scan and expose it on the web? or anyone have already done?; /archives//html/Amps/2010-03/msg00595.html (9,970 bytes)
28. Re: [Amps] 6m amp repaired, thanks for the help (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Tue, 17 Aug 2010 09:00:45 +0900; Congrats Bill for the completion of your 6m amp repair. On six meter I have worked you on 2008 and 2009 season, but did not on this season. I hope to see you again on next season. My hb kw amp worked; /archives//html/Amps/2010-08/msg00275.html (7,147 bytes)
29. Re: [Amps] Fiament watts (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Mon, 30 Aug 2010 18:26:16 +0900; Hi Gents, Thanks for the list of various compelling tubes. Its very nice to see the list for the next HPA project. Now, may I ask you one question? Do you think direct heat tubes such as those noted; /archives//html/Amps/2010-08/msg00454.html (10,890 bytes)
30. Re: [Amps] 3CX1200Z7 backup tube? (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Wed, 1 Sep 2010 16:10:38 +0900; Hi Gents I have 6m HB amp using a 1200A7. At first it worked as a bronco; burned RFC and LPF; it became a lamb after adding a neutralization circuit. Filament voltage/current: 1200A7: 7.5V / 21A 1200; /archives//html/Amps/2010-09/msg00000.html (6,377 bytes)
31. Re: [Amps] vacuum variable caps (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Tue, 7 Sep 2010 13:33:08 +0900; Hi Mike Once I have experienced a small arc between a shaft of a load VVC and its support hardware in my 50MHz hb amp. I have used a flange of its stator for a high-side (signal side) and a bellows/s; /archives//html/Amps/2010-09/msg00033.html (7,593 bytes)
32. Re: [Amps] GS35B questions (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Fri, 10 Sep 2010 11:04:47 +0900; Hi gents Regarding HV connection I am using RG-8U and HN connectors for HV+. HV- is connected by a multi-pin metal remote control connector with its wire harness including AC 100V, DC 12V, grounds, "; /archives//html/Amps/2010-09/msg00054.html (8,521 bytes)
33. Re: [Amps] GS35B questions (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Fri, 10 Sep 2010 12:20:53 +0900; Hi again, Regarding a grid drop resistor I am using two resistors; A: a 500 ohm 10 W from HV- to GND in HVPS. B: a 500 ohm 10 W from HV- to GND in RF deck. C: a 3A Si-diode is also connected between; /archives//html/Amps/2010-09/msg00055.html (11,531 bytes)
34. Re: [Amps] WTB RJ1A vacuum relay (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Mon, 15 Nov 2010 14:30:02 +0900; Hi Jim thanks for the six meter QSO on 2009. I am also using RJ-1As and HC-1s in my hb six-meter amp. de Han JE1BMJ _______________________________________________ Amps mailing list Amps@contesting.c; /archives//html/Amps/2010-11/msg00238.html (7,614 bytes)
35. Re: [Amps] GS35b FWB issue (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Wed, 13 Jul 2011 10:39:03 +0900; hi Dave Are you using a series protection resistor in series of HV capacitor and the cold end of plate RF choke? 30 - 50 ohm 50 - 100 W resistor is enough to protect diodes, IP metering circuits and; /archives//html/Amps/2011-07/msg00126.html (11,709 bytes)
36. Re: [Amps] MRF141g amp kit offered by CCI (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Mon, 22 Aug 2011 18:24:49 +0900; hi Ian I have bought one MRF151G kit from CCI and made experiments for long. There are some tips to tell. It has too much power even on 2nd and 3rd harmonics such as -16dBc (7.5W @300W out). You need; /archives//html/Amps/2011-08/msg00139.html (8,871 bytes)
37. Re: [Amps] MRF141g amp kit offered by CCI (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Wed, 24 Aug 2011 13:50:10 +0900; No Ian, as you mentioned 12dB down (19W @ 300W out) , meant I have obtained harmonics signal level of 7.5W at 300W out after balancing both FETs with independent gate bias circuits. My CCI kit has co; /archives//html/Amps/2011-08/msg00159.html (9,027 bytes)
38. Re: [Amps] Arcing 8877 (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Thu, 1 Dec 2011 13:40:39 +0900; hi Les, Jim and all I agree with Jim's answer. I am also using 50-ohm 100-watt resistor on HV+ line to avoid any failure of meters, tubes, diodes etc. It works fine - it will make a big explosion to; /archives//html/Amps/2011-12/msg00011.html (10,027 bytes)
39. [Amps] SB-1000 160 m power down (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Thu, 15 Dec 2011 12:16:03 +0900; hi gents, Recently I was asked to repair a Heathkit SB-1000 amp from a local friend. At first the Eimac 3-500Z installed was arcing pink like stabilo instead of orange. For many hours I have baked th; /archives//html/Amps/2011-12/msg00116.html (7,882 bytes)
40. Re: [Amps] SB-1000 160 m power down (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Sat, 17 Dec 2011 10:44:05 +0900; Thank you Mike. The input SWR, Ip and Ig seemed OK on all the time. Also thank you Gerald K5GW Until last evening I tried: 1. exchange two 170 pF and one 500 pF adding caps with another set of simila; /archives//html/Amps/2011-12/msg00128.html (8,524 bytes)

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