[QuadList] RCA Hetrodyne Process and Early Color

[Peter Ford]

> Hi
>
> The RCA heterodyne idea came from an existing High Frequency Communication 
> receiver design.
>
> The British Racal RA17 Receivers used a heterodyne system called the 
> Barlow Wadley loop to cancel drift in receiver tuning.
>
> Peter Ford
> pford at clear.net.nz
>
>
>
>> Date: Tue, 10 Nov 2009 16:57:25 EST
>> From: Chill315 at aol.com
>> Subject: Re: [QuadList] RCA Hetrodyne Process and Early Color
>> To: quadlist at quadvideotapegroup.com
>> Message-ID: <c98.5bb58277.382b3bc5 at aol.com>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> The second process has to be both unstable signals.  The only way for 
>> this
>> to work is to use both signals that have the same errors in them to 
>> cancel
>> out the errors.  The interesting part is that it is so simple.
>>
>> Error plus stable equals New Error.
>> New Error minus Error now gives stable.
>>
>> It is so interesting how they came up with it.
>>
>> So what happened to the TRT?
>>
>> Chris Hill
>> WA8IGN
>