[ARC5] transistors

[Henry Mei'l's]

Solid state receivers (maybe National Radio) were brought into the coastal 
station I worked at in the early 60's -- they didn't match the performance 
of  AR88's we were using.

(Also was involved in the testing and design of  the prototype untis for 
vehicle tolling system for the Verazanno-Narrows bridge, using IC's; also in 
the early 60's - was amazed that the units actually worked.)

Henry M.





----- Original Message ----- 
From: "Greg Mijal" <bluebirdtele at embarqmail.com>
To: "Discussion of AN/ARC-5 military radio equipment." 
<arc5 at mailman.qth.net>; <gewhite at crosslink.net>
Sent: Friday, October 01, 2010 9:27 PM
Subject: Re: [ARC5] transistors


> Don't tell that to my SBE SB 34.  She's too hot for that kind of talk.
> 73's
> Greg
> WA7LYO
> Kinston NC
>
> ----- Original Message ----- 
> From: "Dennis Monticelli" <dennis.monticelli at gmail.com>
> To: <gewhite at crosslink.net>; "Discussion of AN/ARC-5 military radio
> equipment." <arc5 at mailman.qth.net>
> Sent: Friday, October 01, 2010 1:54 PM
> Subject: Re: [ARC5] transistors
>
>
>> In the 60's, solid state receivers were decidely inferior to tubes in
>> performance, not to mention EMP.  Part of the problem was the immaturity
>> of
>> the transistors and part was circuit designers being low on the learning
>> curve with respect to getting the best out of these low impedance 
>> devices.
>> Simply trying to retrofit a bipolar transistor into a classical tube
>> circuit
>> topology will guarantee inferior performance.  Once the designers climbed
>> the learning curve and once transistors improved via the migration to Si
>> from Ge along with the emergence of JFETs, dual-gate MOSFETs, and 
>> Schottky
>> diodes then solid state quickly overtook tubes except for higher power
>> stages.  IC's only served to accelerate this trend by introducing
>> practical
>> frequency synthesis.
>>
>> Not uniformly understood is the fact that military research funding
>> leading
>> to military procurement was the principle driver for the young US
>> semiconductor industry.  The US had top universities and corp research
>> labs
>> both fueled by government funding against the backdrop of the cold war.
>> Toss some innovative financing (i.e. venture capital) into the mix and 
>> out
>> pops Silicon Valley.
>>
>> Dennis AE6C
>>
>> On Fri, Oct 1, 2010 at 7:26 AM, gordon white <gewhite at crosslink.net>
>> wrote:
>>
>>>     One of the things the designers at Aircraft Radio Corp. told me in
>>> the 1960s was that building solid-state equipment was not necessarily
>>> BETTER than the tube stuff, though it was of course smaller, lighter,
>>> less power draw. And at one time they began to realize that tubes
>>> withstood EMP better than the "three-legged fuses."
>>>  - Gordon White
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>
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