[GreenKeys] Tone frequency history?

[kn7sfz]

Ah yes....agreed!

Learned sumptin' today...😅

Richard kn7sfz



On 10/8/2021 9:20 PM, Richard Knoppow wrote:
> Filing as described would lengthen the two tines slightly which should 
> lower the frequency.
>
> On 10/8/2021 8:13 PM, kn7sfz wrote:
>>
>>
>> On 10/8/2021 6:54 PM, Jim Haynes wrote:
>>> On Fri, 8 Oct 2021, Nick England wrote:
>>>
>>>> I wonder why 425 Hz tuning forks would have been common? Musical A 
>>>> is 440
>>>> and A-flat is 415.3.
>>>> Maybe 2125/2975 came first and then 425 tuning forks? Hmmmmmmmmm.
>>>> Nick
>>>>
>>> I remember an article about building yourself a 425 Hz frequency 
>>> standard,
>>> since so few of us had access to frequency counters in the early 
>>> RTTY days.  The musical standard then and now was A=440 Hz, but in 
>>> an earlier
>>> time it had been 435 Hz.  And there was someone who had a supply of 435
>>> Hz tuning forks for sale. 
>>
>>
>>> So what we were supposed to do was carefully
>>> use a rattail file at the crotch of the tuning fork and file away just
>>> enough metal to bring it down to 425 Hz.
>>>
>>
>> Would you not have to ADD weight to slow it down?
>>
>> Just my 2 cents....😉
>>
>> Richard de kn7sfz
>>
>>
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