Dr. Gerald N. Johnson wrote:
> On Sun, 2009-03-29 at 16:36 -0400, John Graves wrote:
>> If I may jump in with a question. I have a jupiter but my Drake 2B rcvr
>> might need this, after I recap it.
>>
>> I have a MFJ 259B antenna tester, which will work as a frequency counter
>> that does resolve to 1 Hz.
>
> Resolution is distinct from accuracy. What is the precision of the
> counter's clock? It can be as bad as 100 ppm which is a 100 Hz error at
> 1 MHz or 900 Hz at 9 MHz which is disastrous when aligning a BFO to a
> filter.
Jerry,
The manual claims 1 ppm at room temperature. It is an old (or at least
semi-old) MFJ piece of equipment. But if it is 10 times worse than
spec, it sounds as though it is close enough to bring the adjustment in.
>
John Graves
WA1JG
jh.graves@verizon.net
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