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Today's Topics:
1. power supplies (Michael Goins)
2. Re: power supplies (Phil Sussman)
3. Re: power supplies (Lyle Dunlap)
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Message: 1
Date: Sat, 13 Mar 2010 15:55:22 -0600
From: Michael Goins <wmgoins@gmail.com>
Subject: [TenTec] power supplies
To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Message-ID:
<5e898ae11003131355q11bc0b7cq69e0890f78852f78@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
I'm looking for a 35 amp supply for the Jupiters and leaning heavily
toward old-time transformer supplies (probably an Astron). Bought one,
but it turned up dead when it arrived, so looking for another until I
have time to do the needed repairs I know some of the TenTec supplies
are switchers - but worried about noise as I have a really low noise
floor here. Opinions, please?
Michael Goins, k5wmg
Professor, Writing
University of Texas at San Antonio
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Message: 2
Date: Sat, 13 Mar 2010 17:31:05 -0500
From: Phil Sussman <psussman@pactor.com>
Subject: Re: [TenTec] power supplies
To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Message-ID: <1268519465.4b9c1229e9990@webmail.pactor.com>
Content-Type: text/plain; charset=ISO-8859-1
Typically switching power supplies are much cheaper to produce and
weigh less (due to the lack of that heavy transformer). Unfortunately,
the 'switchers' actually produce more noise (including harmonics), but
are easier to filter.
Older supplies (in my opinion) are less immune to fluctuations in input
with respect to surges and spikes. However, the older units tend to
pull more current and are less efficient than their newer cousins. Also,
their regulation can be sluggish and prone to output transistor overload
failures.
From the noise point of view, filtering older units is a lower frequency
problem whereas newer switchers have higher harmonic output.
In reality; however, both should work without problems unless abused or
overloaded.
Good luck!
73 de Phil - N8PS
-----------
Quoting Michael Goins <wmgoins@gmail.com>:
I'm looking for a 35 amp supply for the Jupiters and leaning heavily
toward old-time transformer supplies (probably an Astron). Bought one,
but it turned up dead when it arrived, so looking for another until I
have time to do the needed repairs I know some of the TenTec supplies
are switchers - but worried about noise as I have a really low noise
floor here. Opinions, please?
Michael Goins, k5wmg
Professor, Writing
University of Texas at San Antonio
------------------------------
Message: 3
Date: Sun, 14 Mar 2010 11:35:27 -0500
From: "Lyle Dunlap" <qskqrq@grics.net>
Subject: Re: [TenTec] power supplies
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Message-ID: <52850AA63A42405FB446C4B989917635@your4dacd0ea75>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Good analogy Phil, I use several of both.
Lyle W9FCX
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End of TenTec Digest, Vol 87, Issue 14
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