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Total 63 documents matching your query.

21. Re: [Amps] MOSFET amp filtering - was: auto-tune (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Mon, 12 Dec 2016 20:07:43 -0600
The general rig's filter method constrains bandwidth in SSB only down about 30 db or so. Then the typical rig gets fat flaring out from there. In some cases, they get VERY fat, very fast. 73/jeff/ac0
/archives//html/Amps/2016-12/msg00335.html (10,320 bytes)

22. Re: [Amps] Decline of homebrewing? (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Mon, 2 Jan 2017 16:13:57 -0600
I agree with Bill generally -- but would add that the term "cost" means both time as well as money. More and more parts are only available in SMT size but for the most part that's not a major limitat
/archives//html/Amps/2017-01/msg00029.html (9,371 bytes)

23. Re: [Amps] Decline of homebrewing? (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Thu, 5 Jan 2017 16:47:13 -0600
If he's got this far without winning the Darwin award, then he may make out fine. But I'm also one of the minority in the US that still believes in the old fashioned principle that a person should be
/archives//html/Amps/2017-01/msg00111.html (9,728 bytes)

24. Re: [Amps] Decline of homebrewing? (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Mon, 9 Jan 2017 15:32:06 -0600
I don't understand this concern over self-termination. There are a thousand ways to kill yourself out in every day life. Driving is something dangerous and people do it every day. Before it was the t
/archives//html/Amps/2017-01/msg00200.html (10,178 bytes)

25. Re: [Amps] Alpha 76 160 meter 2nd harmonic (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Sun, 29 Jan 2017 13:17:41 -0600
It can happen with that amp - been there, done that. I have an Alpha 76pa. And a couple of OO notices, plus a couple more from ops who sent me email with somewhat more detail. What I traced it down t
/archives//html/Amps/2017-01/msg00301.html (8,805 bytes)

26. Re: [Amps] AMPTEC LA4000 (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Thu, 2 Feb 2017 22:16:07 -0600
I doubt comments by guys on the reflectors is weighing in on any biz decision. Far more likely is that the bureaucratic hoops to jump over and legal risks are more substantive. 73/jeff/ac0c www.ac0c.
/archives//html/Amps/2017-02/msg00005.html (8,931 bytes)

27. Re: [Amps] Alpha 77Dx two hole (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Mon, 13 Feb 2017 13:57:40 -0600
Generically speaking, I don't think the 2nd tube changes the tank tune settings - assuming the same total plate current and the HV is unchanged. What does change is the stray anode capacitance (Cout)
/archives//html/Amps/2017-02/msg00083.html (11,261 bytes)

28. Re: [Amps] SS amps watercooling - was PowerGenius XL (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Thu, 16 Feb 2017 22:42:06 -0600
Living life exposes you to a finite risk of death, no matter what you do. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie --Original Message-- From: Big Don Sent: Thursday, February 16, 2017 10:
/archives//html/Amps/2017-02/msg00111.html (10,518 bytes)

29. Re: [Amps] SS amps watercooling - was PowerGenius XL (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Sun, 5 Mar 2017 13:29:03 -0600
I suspect the terms are being mixed up here as well. We use DI water for cleaning in many of the processes in the semiconductor process specifically because of it's aggressive nature - it's an excell
/archives//html/Amps/2017-03/msg00032.html (10,853 bytes)

30. Re: [Amps] New Amplifier (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Mon, 10 Apr 2017 16:31:36 -0500
This is the quandary of the solid state amp. The part can be blasted in such a small time that there is a premium on the speed and thresholds of the protection circuitry - too little or too late and,
/archives//html/Amps/2017-04/msg00056.html (10,304 bytes)

31. Re: [Amps] new amp race (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Tue, 23 May 2017 16:46:59 -0500
The YC156 is a great tube but it has two issues - assuming you have a good tube. First (minor issue) is the grid current limit is 100 mA and with low B+ you can get serious grid current with moderate
/archives//html/Amps/2017-05/msg00267.html (13,204 bytes)

32. Re: [Amps] new amp race (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Tue, 23 May 2017 20:16:38 -0500
Uh huh. There is Cout that is manageable -- and then there is the YC156. I am pretty sure that anyone who has actually been-there, done-that with this tube - would use the term "easily" in conjunctio
/archives//html/Amps/2017-05/msg00270.html (9,937 bytes)

33. Re: [Amps] new amp race (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Tue, 23 May 2017 23:26:55 -0500
A single band amp, 3-500z glass tube - that's not even a beginners challenge by comparison. the Cout is about 7x higher plus the monster anode on the YC156 makes a hell of a good capacitor with the e
/archives//html/Amps/2017-05/msg00278.html (11,259 bytes)

34. Re: [Amps] RF2K+ LDMOS linear (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Sun, 4 Jun 2017 12:19:11 -0500
I'm with Steve here. The old saw of "build a better mouse trap and the world will beat a path to your door" is almost always false because it's hard to believe the hype surrounding stuff. If an amp m
/archives//html/Amps/2017-06/msg00022.html (11,493 bytes)

35. Re: [Amps] RF2K+ LDMOS linear (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Sun, 4 Jun 2017 22:34:40 -0500
Sorry for the confusion. I was thinking of a pair for So2r. Each kit is over $3K - not including delivery or local parts sourcing. Call it $4K as a round number. And you need 2 of them for a serious
/archives//html/Amps/2017-06/msg00029.html (13,952 bytes)

36. Re: [Amps] RF2K+ LDMOS linear (score: 1)
Author: "Jeff AC0C" <keepwalking188@ac0c.com>
Date: Sun, 4 Jun 2017 23:34:30 -0500
For me, especially with RTTY contesting, the capability of running this amp on a So2r basis should not be assumed to be workable until it's actually proved. This gets back to my main point. The gee-w
/archives//html/Amps/2017-06/msg00031.html (16,737 bytes)

37. Re: [Amps] Alpha 87 (not 87A) (score: 1)
Author: "Jeff" <keepwalking188@ac0c.com>
Date: Tue, 7 Nov 2017 12:21:53 -0600
It's true that a mistuned amp can generate plenty of harmonic energy content. Many years ago I was running a 76PA into a resonant but extremely narrow banded 160m antenna. There was a contest going a
/archives//html/Amps/2017-11/msg00048.html (10,193 bytes)

38. Re: [Amps] GI-7b amp (score: 1)
Author: "Jeff" <keepwalking188@ac0c.com>
Date: Wed, 8 Nov 2017 13:28:57 -0600
The tube is ok. It needs voltage to really do a good job so for the B+ think above 2500. Plus you need a pi input net to get decent efficiency out of the tube. A swamped resistor drive results in poo
/archives//html/Amps/2017-11/msg00075.html (8,818 bytes)

39. Re: [Amps] Defining CCS (score: 1)
Author: Jeff Blaine <KeepWalking188@ac0c.com>
Date: Sun, 31 Dec 2017 12:30:59 -0600
A few years back Alpha had a 9500 on display complete with brick and key.  But on close examination it was setup with a hidden keyer sending a string of dits.  I asked the guy about it and he said th
/archives//html/Amps/2017-12/msg00199.html (9,253 bytes)

40. Re: [Amps] Defining CCS (score: 1)
Author: Jeff Blaine <KeepWalking188@ac0c.com>
Date: Mon, 1 Jan 2018 13:57:38 -0600
I don't know about that.  I'm like Bill - got tired of my amps dying in the middle of RTTY contesting.  Never had a new modern amp and the old stuff was always breaking down for some reason or anothe
/archives//html/Amps/2018-01/msg00004.html (11,530 bytes)

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