[time-nuts] Used Rb Operating Lifetime

[David]

I think even my old Icom 706 would work that way.  It has the high
stability option installed.  From what I remember from the service
manual, every mixer has its local oscillator frequency locked to the
master oscillator through either a PLL or DDS which makes passband
shifting via the IF frequencies very easy.  Since all of the local
oscillators except for the first one have very little range and are
relatively low frequency, the frequency synthesis was not too
expensive to do.

I suspect a Roanoke style direction finder with multiple radios would
work fine without locking the receiver oscillators but that requires a
carrier for FM demodulation.

On Sun, 01 Jan 2012 17:55:35 -0800, gary <lists at lazygranch.com> wrote:

>This is an interesting observation regarding the Icom radio that can be 
>run from one master reference. I would assume any radio which has a high 
>accuracy option has this feature. Looking at the block diagram of the 
>R-8500, this appears to be an option. For the R-7100, it looks like it 
>uses one oscillator for some operating modes. There is a 1GHz mixer on 
>the front end that can be switched in and out. That mixer is not derived 
>from the master.
>
>The only reason I mention this is there are directing finding schemes 
>based on identical receivers but separate antennas.
>
>The traditional diode mixer before the radio DF scheme doesn't work well 
>on digital signals.
>
>Some of the more recent high end radios from AOR have this one master 
>oscillator scheme.
>
>On 1/1/2012 4:14 PM, Magnus Danielson wrote:
>>
>> So, they essentially did what I did with the heat gun, heat it up
>> properly. This technique was not "invented" by me, I in turn had picked
>> it from Gerald Molenkamp VK3GJM for the FRS-C:
>> http://www.vk3um.com/Rubidium%20Standard.html
>>
>> Cheers,
>> Magnus
>
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