[time-nuts] Advice on TRACOR 527E

Marco IK1ODO ik1odo at spin-it.com
Sun Mar 7 13:10:45 UTC 2010


At 14.05 07/03/2010, Bob Camp wrote:

>One thing you will run into on the 527 - They originally came out in 
>the era of  5 MHz standards. The specs on the boxes only list 
>100KHz, 1 MHz, and 5 MHz as valid inputs. In reality, they will 
>accept anything that's an integer sub-multiple of 5 MHz as an input 
>(2.5 MHz, 1.66666 MHz, 500 KHz ...). The front end is an injection 
>locked multivibrator. Check to see how happy yours is with a 10 MHz 
>input. Most will run with 10 MHz and some multiples of 5 MHz sub 
>multiples (like 5/2 x 3 = 7.5 MHz).

I agree, mine is happy measuring a 10 MHz signal, but prefers a 5 MHz 
reference - it has less noise.

Marco IK1ODO




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