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Total 53 documents matching your query.

1. [Amps] Test, 123 (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Sat, 28 Apr 2007 11:19:47 -0400
Dear Ampers, Juno started blocking the AMPS reflector totally, so I switched to another server through the work QTH, and am sending this as a test. '73, Hal Mandel W4HBM/4 Tampa, Florida ____________
/archives//html/Amps/2007-04/msg00355.html (6,712 bytes)

2. Re: [Amps] rfi (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Wed, 2 May 2007 12:22:34 -0400
Stand on board the pennant deck and throw an egg up in front of the rotating master radar dish if you can get it up that high: Blammo! Don't let the Master Chief catch you fooling around because gues
/archives//html/Amps/2007-05/msg00022.html (7,782 bytes)

3. Re: [Amps] Bird wattmeter (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Mon, 7 May 2007 06:32:52 -0400
However, do not see their display results as gospel. If you need to know the actual power, use a digital RF Power Meter like the kind that is discussed herein made by Array Solutions (PowerMaster). T
/archives//html/Amps/2007-05/msg00050.html (9,185 bytes)

4. Re: [Amps] Henry 2K-3 key...how to crack... (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Mon, 7 May 2007 08:57:45 -0400
Contact Ted Shannon at Henry in California for a spare key or simply drill the lock. Locks are pretty, but keys seem to find the black holes in the universe to drop in to. And who are you keeping out
/archives//html/Amps/2007-05/msg00056.html (7,904 bytes)

5. Re: [Amps] Bird wattmeter (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Mon, 7 May 2007 09:40:03 -0400
Tom's reply to the PowerMaster wattmeter drove me to inquire as to the calibration science behind them, and below is the listed response: " As shown in Table 2, the PowerMaster is quite accurate over
/archives//html/Amps/2007-05/msg00058.html (10,028 bytes)

6. Re: [Amps] Bird wattmeter (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Mon, 7 May 2007 14:38:30 -0400
Dear Tom, As my first posting in the above topic mentioned, the Bird wattmeter is good for observing trends. Tune it up, watch for the most smoke, be happy. There ain't any precision, Tom. The averag
/archives//html/Amps/2007-05/msg00061.html (13,821 bytes)

7. [Amps] WATTMETERS (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Tue, 8 May 2007 11:03:42 -0400
Here's the same question posed to all those guys contemplating an amplifier-build project: What's your budget? If you just need to know when maximum smoke happens and you're interested to see if the
/archives//html/Amps/2007-05/msg00078.html (7,285 bytes)

8. Re: [Amps] Power factor and choke vs resonant-choke input supplies (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Thu, 10 May 2007 08:53:53 -0400
Dear Boris, The closer you look at power supply chokes, the worse the situation appears. Firstly, the sheer weight of copper and iron is daunting. Secondly, the cost of copper approaching that of gol
/archives//html/Amps/2007-05/msg00103.html (8,700 bytes)

9. Re: [Amps] Power factor and choke vs resonant-choke input supplies (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Thu, 10 May 2007 16:18:35 -0400
Dear Barrie, Now you have a project! First thing: See if your choke winding has a gap. That's the big ticket hurdle, because without a gap, it can't swing. Next, use your B&K LCR meter to measure the
/archives//html/Amps/2007-05/msg00110.html (11,582 bytes)

10. Re: [Amps] What does full duty cycle mean? (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Fri, 21 Sep 2007 14:01:14 -0400
"Full Duty Cycle" is clearly an audiophoolery term. "Your $11,000.00, dual 6550 (KT-88 optional) tube amplifier, equipped with oxygen-pure, silver-impregnated multi-strand speaker cable, is rated for
/archives//html/Amps/2007-09/msg00223.html (8,920 bytes)

11. Re: [Amps] Winding large inductors (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Wed, 21 Nov 2007 07:22:05 -0500
Go to your local machine shop. Decide on the inner diameter and find a piece of PVC tubing that will do the job. Drill a .250 anchor hole in the side near one end. Use that hole to grab the tubing. H
/archives//html/Amps/2007-11/msg00300.html (9,801 bytes)

12. [Amps] Conductive Grease (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Mon, 26 Nov 2007 07:08:25 -0500
The question of a suitable grease for roller inductor parts came up in this reflector about one year ago. The material called molybdenum disulphide grease was found to afford the best conductivity wh
/archives//html/Amps/2007-11/msg00371.html (6,711 bytes)

13. Re: [Amps] HV Supplies and Diodes (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Thu, 3 Jan 2008 14:56:53 -0500
In answer to Bill Fuqua's question, experience and older copies of the Handbook provided the information to multiply the a.c. secondary voltage by a minimum of 2.82 for the diode capability. Practica
/archives//html/Amps/2008-01/msg00035.html (8,516 bytes)

14. Re: [Amps] Drake L7 in UK, any idea of value please? (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Wed, 26 Mar 2008 06:05:30 -0400
Dear Tyrone, The desirability of amplifiers with ten meters in the U.S. is probably for CB operators wanting to tune up on 27.025MHz. Most of the hams I know could care less about 10 meters, much les
/archives//html/Amps/2008-03/msg00271.html (9,433 bytes)

15. Re: [Amps] SB220 "A" mods (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Fri, 28 Mar 2008 11:05:22 -0400
In joking about the distant past I ask my ex-G.I. buddies if they remember that trashcan by the door of the recruit barracks, and what went inside it. That gets a laugh, guaranteed! Some of us even g
/archives//html/Amps/2008-03/msg00311.html (8,354 bytes)

16. Re: [Amps] SB220 "A" mods (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Sat, 29 Mar 2008 11:28:55 -0400
Using open wire, 600 ohm feeders and running QROO with ten feet of feedline in the shack gave me fits on several bands, with various speakers grumbling about as audio was transmitted. Aside from usin
/archives//html/Amps/2008-03/msg00335.html (9,897 bytes)

17. [Amps] Relays (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Sun, 30 Mar 2008 08:00:58 -0400
When I first saw a Jennings RJ-1, and compared it to the open frame relay my '220 was using, it was astonishing. That was because vacuum relays are good for isolation. However RJ-1's are virtually us
/archives//html/Amps/2008-03/msg00353.html (7,533 bytes)

18. Re: [Amps] Relays (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Wed, 2 Apr 2008 10:07:32 -0400
A few years ago while tackling the design error in the "Transmogrification of Blind Joe Death" conversion of the ETO Alpha 77dX into the 77sX, I had a chance to speak with several of the original des
/archives//html/Amps/2008-04/msg00035.html (8,721 bytes)

19. Re: [Amps] HV step start (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Mon, 7 Apr 2008 07:19:59 -0400
S t e v e , {Snip} 1. Should there be a step-start resistor in both primary legs or is just one leg adequate? If the transformer has multiple windings for changing from 120 to 240 then putting a step
/archives//html/Amps/2008-04/msg00094.html (8,464 bytes)

20. Re: [Amps] mounting a vacuum cap (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Tue, 8 Apr 2008 09:35:00 -0400
The blue painted housing is for the threaded shaft accommodation. There is no problem with its protrusion. Matter-of-fact, in my last amplifier project the RF head used a 3/8" thick aluminum mount fo
/archives//html/Amps/2008-04/msg00113.html (8,182 bytes)

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