[time-nuts] Advice on TRACOR 527E
Bob Camp
lists at rtty.us
Sun Mar 7 13:16:05 UTC 2010
Hi
There's a tradeoff in the front end circuit between 100 KHz and 10 MHz inputs. If you do not plan to use 100 KHz, you can tweak the input to do a bit better at 10 MHz.
For both frequencies, "tuning" the multivibrators to run at the correct free run frequency can help noise issues.
Bob
On Mar 7, 2010, at 8:10 AM, Marco IK1ODO wrote:
> 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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