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Total 52 documents matching your query.

1. [Amps] VHF amplifier input network (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Mon, 17 Dec 2007 17:52:59 +0900
Hello OMs. I am using a home brew made six-meter linear amplifier with a 3CX1200A7, pi input and pi-L output network. Now I have a difficulty to find a design/calculation method for the very popular
/archives//html/Amps/2007-12/msg00174.html (7,364 bytes)

2. [Amps] test (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Tue, 18 Dec 2007 16:30:57 +0900
test. thanks. de Han JE1BMJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2007-12/msg00175.html (5,997 bytes)

3. Re: [Amps] VHF amplifier input network (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Thu, 20 Dec 2007 13:40:52 +0900
Thank you very much for the reply Ian. I realized that the network input - VC1 - L1 - VC2 - L2 - Cin//R can be written as input - C1 - L1 - L2 - C2+C3 - L3 - Cin - R where C1 and L1 is a series reson
/archives//html/Amps/2007-12/msg00181.html (7,880 bytes)

4. Re: [Amps] VHF amplifier input network (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Fri, 21 Dec 2007 14:14:02 +0900
Gerald, thanks for the comment. Assuming the network type: input - C1 - L1 - L2 - C2+C3 - L3 - Cin+ R and excluding C1-L1, I think I have solved the network as a L-pi circuit. It is interesting that
/archives//html/Amps/2007-12/msg00183.html (8,431 bytes)

5. Re: [Amps] input/output transformer switching (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Sat, 22 Dec 2007 17:10:15 +0900
Paul, Even in gemini-package each FET devices are not exactly matched. So I think you need an independent gate bias circuits to enable adjustment of Iq of each FETs in a package. Set Iq of each FETs
/archives//html/Amps/2007-12/msg00197.html (9,272 bytes)

6. Re: [Amps] input/output transformer switching (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Sat, 22 Dec 2007 21:00:09 +0900
Hi David, For sprit bias method the temperature compensation is not essential, provided not setting excessive Iq for each FETs with proper heat-radiation means because 141G or 150/151Gs are not so se
/archives//html/Amps/2007-12/msg00198.html (7,922 bytes)

7. Re: [Amps] High voltage power supply for linear amp (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Wed, 2 Jan 2008 17:42:06 +0900
Hi Jose A single leg in a HV rectifier bridge need half PIV (Peak Inverse Voltage) and provide two times a rating current compared to a half-wave rectifier because a bridge has two legs against rever
/archives//html/Amps/2008-01/msg00014.html (7,221 bytes)

8. Re: [Amps] High voltage power supply for linear amp (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Thu, 3 Jan 2008 13:58:56 +0900
Thanks to Gary and all in another HVPS thread, I found it in Power Supplies section in the ARRL Handbook 2007: "With modern diodes, this practice is no longer necessary" I am now using two EDHD 15K d
/archives//html/Amps/2008-01/msg00023.html (7,225 bytes)

9. Re: [Amps] INTERFACING IC-746 with Amp Supply LA-1000 amp (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Mon, 7 Jan 2008 14:30:13 +0900
Hi Dave According to Japanese manual of IC-746 it can controll a linear amp by using a "send jack" located at the rear-panel. The send jack is using a relay capable of switching DC 16V-2A and its cen
/archives//html/Amps/2008-01/msg00070.html (7,119 bytes)

10. Re: [Amps] INTERFACING IC-746 with Amp Supply LA-1000 amp (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Mon, 7 Jan 2008 18:45:13 +0900
gm Roger It would be a simple matter if the amp is using a T-R control by grounding a cold end of a relay coil; maybe THP and Henry do. I am also using similar scheme in my hb linear amp. For once in
/archives//html/Amps/2008-01/msg00072.html (8,659 bytes)

11. [Amps] Do you know the word "washlet" ? (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Wed, 9 Jan 2008 17:25:21 +0900
They say the washlet is not so popular in the world except Japan but it is famous that Madonna has employed in her residence. I am using two washlets in my home now. Some Japanese hams have reported
/archives//html/Amps/2008-01/msg00081.html (6,566 bytes)

12. Re: [Amps] Step start (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Sun, 3 Feb 2008 21:49:16 +0900
Hi all, The primary and the only purpose of a step-start circuitry is to avoid inrush current and to protect filaments, rectifier diodes, capacitors and other circuit components from a disaster by a
/archives//html/Amps/2008-02/msg00007.html (7,716 bytes)

13. Re: [Amps] Step start (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Thu, 7 Feb 2008 10:12:09 +0900
GM all As Steve told whatever loop (open or closed) has been chosen a situation where a relay contact will not close and inrush-current limitation resistor R will never be shorten can happen. To addr
/archives//html/Amps/2008-02/msg00035.html (8,191 bytes)

14. Re: [Amps] Step start (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Fri, 8 Feb 2008 19:35:19 +0900
Thanks to the nice comment from Ian, I am confident that I can realize a highly reliable amplifier than the solar cycle-23. As I am now under construction to install multiple filter capacitors into m
/archives//html/Amps/2008-02/msg00043.html (8,571 bytes)

15. Re: [Amps] SB-220 on 6 meters: looking for projects... (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Fri, 8 Feb 2008 19:36:34 +0900
Piacere Joe You can see photos of modified TL-922 for six meters: http://www.bear-el.com/tl-922sp/index.html and SB-1000 for six: http://www.bear-el.com/sb-1000sp.html HL-2K for six: http://www.bear-
/archives//html/Amps/2008-02/msg00044.html (8,006 bytes)

16. Re: [Amps] SB-220 on 6 meters: looking for projects... (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Mon, 11 Feb 2008 14:55:05 +0900
Joe I forgot a link of SB-220 for six. http://www.iizuka-net.ne.jp/~bear-el/sb-220-6m/ GL, de Han JE1BMJ 2008/02/06 20:14 _______________________________________________ Amps mailing list Amps@contes
/archives//html/Amps/2008-02/msg00052.html (8,248 bytes)

17. Re: [Amps] SB-220 on 6 meters: looking for projects... (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Thu, 21 Feb 2008 11:15:30 +0900
http://www.iizuka-net.ne.jp/~bear-el/sb-220-6m/ In Japan SB-220 is rare, on this time I will modify it to six meters. In operation SB-220 is as same as TL-922 or HL-2K with two 3-500Zs. This SB-220 h
/archives//html/Amps/2008-02/msg00137.html (9,100 bytes)

18. [Amps] Oil-caps delating 2/3 ratings? (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Thu, 6 Mar 2008 19:02:47 +0900
Recently an old man told me that all of the caps are energy storage jobs and they are usually derated for continuous duty to about 2/3 rating. I thank him very much. I am using cheap 32uF 4500V GE no
/archives//html/Amps/2008-03/msg00045.html (7,658 bytes)

19. Re: [Amps] Oil-caps delating 2/3 ratings? (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Fri, 7 Mar 2008 19:15:52 +0900
Sorry not delating but derating. I thank so much to those who gave me the answers on this thread. As I did not find the information regarding these GE 4500V 32uF caps except leakage from their body,
/archives//html/Amps/2008-03/msg00066.html (7,865 bytes)

20. Re: [Amps] Relays (score: 1)
Author: "Han Higasa" <higasa@plum.ocn.ne.jp>
Date: Mon, 31 Mar 2008 18:57:00 +0900
Hi all, I am also using HC1s and RJ1As for a line-in relay of my amp. I am not using it for full break-in but it is working so reliable, without any trouble for many years. a few points: 1. Whatever
/archives//html/Amps/2008-03/msg00381.html (10,122 bytes)

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