[Hallicrafters] DD-1 Audio amplifier |
Richard Knoppow
1oldlens1 at ix.netcom.com
Fri Feb 24 16:58:12 EST 2012
----- Original Message -----
From: "Duane Fischer, W8DBF" <dfischer at usol.com>
To: "Richard Knoppow" <1oldlens1 at ix.netcom.com>; "Waldo
Magnuson" <magnuson at mac.com>;
<Hallicrafters at mailman.qth.net>
Cc: "Waldo Magnuson" <magnuson at mac.com>
Sent: Friday, February 24, 2012 1:21 PM
Subject: Re: [Hallicrafters] DD-1 Audio amplifier
> Richard,
>
> Per my prior post of the specifications of the DD-1 by
> Chuck Dachis, Radios By Hallicrafters 2nd Edition, the
> frequency response was 200 Hz to 6000 HZ. More than
> adequate for speech communications and not too shabby for
> general listening either!
>
> Because Bill Halligan, Sr., and his partner Toby, traveled
> the world, literally, to purchase the best transformers,
> resistors, capacitors etc. it is most likely that the DD-1
> contained the best quality components they could procure.
>
> Now let me state without prejudice, that a very brilliant
> Engineer designed the DD-1, and it did have its share of
> proponents and opponents among the Hallicrafters powers
> that were. This same Engineer designed two other receivers
> that I am aware of. One was a brilliant success, the other
> was a total flop. Primarily because the Engineer refused
> to make several changes in the RX that other Engineers
> told him were needed. Ego got in his way, the SX- failed
> badly and he lost his job.
>
> Yes I know his name, but most of you probably know of whom
> I am speaking of already.
>
> While I was performing around our country I used a HME
> Dual Diversity receiver with a wireless lapel microphone.
> It performed nothing short of fantastic! I suspect the
> Engineer who designed the DD-1 might have been too many
> years ahead of the engineering mentality of the time.
>
I don't have the details in mind right now but
diversity, I think in the form of polarization diversity, is
commonly used in microwave relay and studio to transmitter
links because variations in the air cause preferential
fading of one or the other path. I don't remember when the
simple expedient of using either two antennas or circularly
polarized antennas was first used. Microwaves are subject to
effects from water vapor in the atmosphere which can cause
all sorts of problems. I think the radio mic problem is
similar but due mostly to varying reflections.
I am not sure who you are referring to at
Hallicrafters. Hallicrafters is notorious for all sorts of
variations during production, I suspect because of
procurement problems. While H made a lot of low-priced stuff
IMO they never built much junk (some exceptions to this) and
many of their products performed very well. A few H
products, the SX-117 comes to mind, were evidently
exceptional performers.
Ego and hubris are, of course, the basis of many of
Shakespeare's plays. I am personally offended by arrogance,
another manifestation of the same thing. It would be nice if
poetic justice happened to these folks more often but it
doesn't.
--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com
More information about the Hallicrafters
mailing list
This page last updated 19 Mar 2024.