[ARC5] Product detectors - the name.

[George Babits]

Well Osterman is wrong if he says 1958.  I checked  the 2nd edition of 
Moore's "Communications Receivers" and it says 1955.   The 75A-4 shows up in 
the 1955 ARRL Handbook too.

73,
George
W7HDL


----- Original Message ----- 
From: "Dennis Monticelli" <dennis.monticelli at gmail.com>
To: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
Cc: "ARC-5 Maillist" <Arc5 at mailman.qth.net>
Sent: Thursday, May 11, 2017 4:53 PM
Subject: Re: [ARC5] Product detectors - the name.


> According to Osterman's book, the 75A-4 was introduced in 1958 and the
> NC-109 was introduced in 1957.
>
> Dennis AE6C
>
> On Thu, May 11, 2017 at 3:03 PM, Kenneth G. Gordon 
> <kgordon2006 at frontier.com
>> wrote:
>
>> On 11 May 2017 at 14:27, K5MYJ wrote:
>>
>> > I just checked the manuals for the Collins 75A-3 and 75A-4.
>> >
>> > The 75A-3 was sold as an AM/CW/FM receiver. The 75A-4 was sold as an
>> AM/SSB/CW receiver.
>> >
>> > The 75A-3 did not have what we now call a product detector.
>> >
>> > The 75A-4 had both diode(AM) and product(SSB/CW) detectors.
>> >
>> > To me the 75A-4 is the first receiver I know of to be designed for SSB.
>>
>> Did that pre-date the National NC-109?
>>
>> Ken W7EKB
>>
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