[ICOM] First Icom HF radio was IC-701

[Adam Farson]

Hi Bill,

Actually, the first commercially-available professional receiver  to utilise
the Wadley loop was the Racal RA17. Dr. Trevor Wadley was a South African
scientist who developed this system.. The Wadley loop is not a PLL; it uses
the drift-cancelling principle. 

I had the honour of working under Dr. Wadley at Racal in South Africa for a
few months, back in 1965. The man was simply brilliant.

Here is a brief account:

http://www.televideo.ws/wadley.html

Back on topic: By the time Dr. Inoue was ready to venture into HF, PLL
synthesis was already fairly mature.

Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Charles.Frost at aliefisd.net
Sent: 19-Oct-07 06:08
To: icom at mailman.qth.net
Subject: RE: [ICOM] First Icom HF radio was IC-701

That could be but you notice the name Wadley.
73
Frosty  K5LBU

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net]
On Behalf Of Bill Gode, Sr.
Sent: Friday, October 19, 2007 8:03 AM
To: icom at mailman.qth.net
Subject: Re: [ICOM] First Icom HF radio was IC-701

I apologize for the OT radio history, but I believe the first PLL receiver
was actually the National AN/WRR-2 (FRR-59) from the late 1950s.  It had 64
tubes and a Wadley Loop synthesized HFO.  You can see photos and examine the
block diagram here:

http://web.tiscalinet.it/milradio73/radio_WRR2.html

73,

Bill, W9NHQ

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