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References: [ +from:hmandel@barantelecom.com: 53 ]

Total 53 documents matching your query.

21. Re: [Amps] Dual power supplies in EB104 4X MRF150 design (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Thu, 10 Apr 2008 15:00:19 -0400
Good question! The issue of series-connected switching supplies without the use of a suitable controller is handled by the HIPOT test first. Most of the module regulators will use the frame ground as
/archives//html/Amps/2008-04/msg00153.html (10,083 bytes)

22. [Amps] The B- Rail (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Fri, 11 Apr 2008 10:14:00 -0400
The B- rail, especially if dealing with a separate power supply, is just as hazardous as the B+ rail! Ordinarily the amplifier of good design will have bleeder resistors from B+ to Frame, a series of
/archives//html/Amps/2008-04/msg00168.html (7,290 bytes)

23. [Amps] Suggestions for Storage of Amps and Radios (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Fri, 11 Apr 2008 16:04:11 -0400
The longest run of storage requires hermetically-sealed technology. With a desiccant media like silica-gel, the hermetically sealed environment's residual moisture is absorbed by the desiccant. Theor
/archives//html/Amps/2008-04/msg00175.html (8,645 bytes)

24. [Amps] Test (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Mon, 28 Apr 2008 16:11:13 -0400
Here is a test _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2008-04/msg00314.html (6,561 bytes)

25. Re: [Amps] liquid cooled Amplifier coolant recommendations (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Fri, 16 May 2008 07:48:20 -0400
Fletch, The subject of cooling fluids was covered in this reflector not too long ago under the topic of water-cooled RF dummy loads such as the Bird Econoload series. The bullet points were: 1. Ordin
/archives//html/Amps/2008-05/msg00103.html (7,772 bytes)

26. Re: [Amps] Sheet aluminum (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Fri, 16 May 2008 08:03:52 -0400
By adding panel details such as angle aluminum trim to edges, with subsequent neat fastener/hardware, each panel will be strengthened. However, with adding interior decking suitably fastened to the f
/archives//html/Amps/2008-05/msg00104.html (8,322 bytes)

27. Re: [Amps] Acom 1000 display? (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Fri, 16 May 2008 09:29:31 -0400
This is what happened to me with the Emtron amp. RF was getting into the LED Bargraph department and the display had no relation to what the amp was doing. Antenna Works sells coax line filters you i
/archives//html/Amps/2008-05/msg00106.html (7,256 bytes)

28. Re: [Amps] Higher power transmitting tubes for "portable" amps. (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Thu, 22 May 2008 07:15:38 -0400
{snip} Gents, suppose a guy wants to build a *portable* 1.5KW output amplifier. Would a 8877 be a good tube to use for that or is there something better, more rugged, etc? {snip} The key to the matte
/archives//html/Amps/2008-05/msg00164.html (8,446 bytes)

29. Re: [Amps] Repair Source for RF Applications P-5000 Wattmeter (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Wed, 28 May 2008 15:38:40 -0400
Frontier Electronics http://www.freng.com << support@freng.com >> 970 371 0356 Mr. Wilson was president of ETO/Alpha when the 77Dx was designed and marketed, and then opened his own firm. Hal Mandel
/archives//html/Amps/2008-05/msg00211.html (8,130 bytes)

30. Re: [Amps] How to safely clean an amplifier? (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Sat, 31 May 2008 09:50:29 -0400
Jack, You know in your heart the only true method is a total refurbishment: Yank every single component out and reduce the unit to a bare metal chassis and have it re-plated with Iridium Class-III (c
/archives//html/Amps/2008-05/msg00216.html (7,575 bytes)

31. [Amps] The Market should be D.O.A. (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Thu, 5 Jun 2008 11:21:01 -0400
In the Alpine Tower on New Jersey's Palisades, there are roughly two hundred clients with transmit sets in the building right under the base. When I was there doing an inspection we took a "cook's to
/archives//html/Amps/2008-06/msg00025.html (8,763 bytes)

32. Re: [Amps] Alpha 77dx (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Fri, 6 Jun 2008 13:40:12 -0400
Jim, The two-tube '77 sometimes says "77Dx" on the beige front panel, but is a "77Sx" machine. There were several editions of '77's: Very, very few 2-tube '77's were made by the ETO factory. These ar
/archives//html/Amps/2008-06/msg00042.html (7,724 bytes)

33. Re: [Amps] Alpha 77dx (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Fri, 6 Jun 2008 16:38:19 -0400
Ebay#290236449389... Awww, gee whiz. I bet the seller is an OT who needs the dough for rent or gas. What a shame. You can tell it is his "honey." And three spare 8877's ! That alone is worth nearly $
/archives//html/Amps/2008-06/msg00053.html (8,193 bytes)

34. Re: [Amps] Alpha 77dx (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Sun, 8 Jun 2008 13:02:50 -0400
The seller reputation is supposedly 100%, but the FOUR total transactions were over 90 days ago so they cannot be traced by a subscriber. Hal Mandel _______________________________________________ Am
/archives//html/Amps/2008-06/msg00066.html (8,229 bytes)

35. Re: [Amps] Transformers (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Tue, 17 Jun 2008 07:47:10 -0400
The transformer specified for the 4CX15,000A project is a 37.5KVA and weighs 565 pounds, dry. Hal Mandel W4HBM Hi Dino, Wow, that's one big transformer! 3750kVA! That's several times larger than the
/archives//html/Amps/2008-06/msg00123.html (9,591 bytes)

36. [Amps] WG7K (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Tue, 17 Jun 2008 15:04:07 -0400
Steve, Your e-mail server excludes any replies sent to you. Hal Mandel W4HBM _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/
/archives//html/Amps/2008-06/msg00127.html (6,227 bytes)

37. Re: [Amps] Tube suggestion needed - 6 and/or 2M ~500W level with800-1kv on plate? (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Sat, 21 Jun 2008 14:20:20 -0400
{snip} One idea Ive not tried is to take a regular 4CX250B and remove the radiator (they are soldered on) and then make up your own solid block. Or saw off one side of fins and replace with a brass p
/archives//html/Amps/2008-06/msg00157.html (9,142 bytes)

38. Re: [Amps] little OT, but here goes . . . (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Tue, 24 Jun 2008 08:17:03 -0400
You KNOW your amp might be big enough when the hotel rooms, corridor lights and elevator pop their circuit breakers when you whistle into the mike. You KNOW your amp might be big enough when you lear
/archives//html/Amps/2008-06/msg00203.html (9,004 bytes)

39. Re: [Amps] Not OT (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Tue, 24 Jun 2008 08:39:54 -0400
Real hams have anode transformers they need an engine hoist to shlep around. They honestly think the chain falls hanging from the overhead is a normal part of hamming...... Hal ______________________
/archives//html/Amps/2008-06/msg00205.html (8,706 bytes)

40. Re: [Amps] Creating chimneys from silicone sheet (score: 1)
Author: "Harold Mandel" <hmandel@barantelecom.com>
Date: Tue, 24 Jun 2008 08:45:31 -0400
Dave, {snip} http://www.smallparts.com/products/descriptions/899.CFM What sort of adhesive is used to make the sheet section into a suitable cylinder or cone? {snip} This material is excellent, and A
/archives//html/Amps/2008-06/msg00206.html (7,453 bytes)

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