[ARC5] Product detectors - the name.
K5MYJ
macklinbob at gmail.com
Thu May 11 23:35:30 EDT 2017
I was in SAC when Curtis LeMay, Barry Goldwater, and Art Collins introduced SSB to the USAF.
Barry Goldwater was a USAF Reserve General.
This was in the period between 1955 and 1958. In 1957 we had a 75A-4 in the Bergstom AFB MARS Shack.
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message -----
From: Dennis Monticelli
To: George Babits
Cc: ARC-5 Maillist
Sent: Thursday, May 11, 2017 8:19 PM
Subject: Re: [ARC5] Product detectors - the name.
My error. Read it too quickly and read it wrong. Osterman 3rd edition reports it ended being sold in 1958. It started in 1955 as others have correctly reported.
Dennis AE6C
On Thu, May 11, 2017 at 5:30 PM, George Babits <gbabits at custertel.net> wrote:
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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