[Collins] Any Frequency

james.liles james.liles at comcast.net
Tue Oct 6 11:19:26 EDT 2009


Has anyone measured or even detected the phase noise that an Si570 chip has 
added to an HF radio???  Can the consequence be distinguished while being 
used in a pristine natural low noise environment?  Have used an HP8664A 
w/opt 4 to sub as the LO in other HF receivers and could not distinguish any 
difference between the crystal or 8664A with option 4 on or off.  When used 
in a shielded dummy load environment with the 8664A, phase noise becomes 
apparent to measurement but not to the ear when compared to HF noise.  If 
the plan is to use the radio for general coverage, experimenting with a chip 
sounds like a novel idea.  Kindest regards Jim K9AXN

----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at weather.net>
To: <collins at mailman.qth.net>
Sent: Monday, October 05, 2009 10:35 PM
Subject: Re: [Collins] Any Frequency


> On Mon, 2009-10-05 at 15:18 +0000, Kees & Sandy wrote:
>> How about a small device (Si570 chip with controller) which has the 
>> stability of a crystal and can be used to feed into a crystal socket 
>> .....and has 1000 memories to make any Collins KWM-2, etc rig a general 
>> coverage unit .....Rx and Tx ?
>> 73 Kees K5BCQ
>
> Sure, at the cost of a PIC chip to set the discrete frequencies need and
> increased phase noise in the receiver compared to good crystal
> oscillators.
>
> -- 
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
>
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