[time-nuts] 5MHz x 10MHz

[Dave Brown]

Even HP used 5MHz when it counted (no pun intended!) - the 5245L used a 1MHz 
timebase while the higher spec timebase in the 5245M used 5MHz.
 DaveB, NZ


----- Original Message ----- 
From: "Bob Camp" <lists at rtty.us>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Saturday, August 03, 2013 8:47 AM
Subject: Re: [time-nuts] 5MHz x 10MHz


> Hi
>
> Except for HP, everything from the US would have been 5 MHz as well.
>
> Bob
>
> On Aug 2, 2013, at 3:51 PM, Robert Atkinson <robert8rpi at yahoo.co.uk> 
> wrote:
>
>> Hi
>> Most of the British Racal standards are 5MHz. It may well have been down 
>> to what was the best performance of the nationally avilable crystals. 
>> Everthing is a compromise.
>> It is easy to double a 5MHz output to 10MHz. One way is to pass it 
>> through a bridge rectifier (high speed diodes of course) and then filter 
>> it. old 10Mbs "thin" ethernet filters from network cards work well. Check 
>> the archives and do a websearch.
>>
>>
>> Robert G8RPI.
>>
>>
>>
>> ________________________________
>> From: Bob Camp <lists at rtty.us>
>> To: Discussion of precise time and frequency measurement 
>> <time-nuts at febo.com>
>> Sent: Friday, 2 August 2013, 20:12
>> Subject: Re: [time-nuts] 5MHz x 10MHz
>>
>>
>> Hi
>>
>> It may well have been teamed up with a piece of Russian designed 
>> equipment.
>>
>> Bob
>>
>> On Aug 2, 2013, at 2:40 PM, Euclides Chuma <euclides at w2c.com.br> wrote:
>>
>>> Hi,
>>>
>>> I thank all for your responses.
>>>
>>> My question arose because I bought a TFL Rubidium Standard and the 
>>> signal output is 5 MHz. It is a great rubidium standard so I dont 
>>> understand the reason of the 5 MHZ signal output since the 10 MHz is the 
>>> common standard.
>>>
>>> Best regards
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>>
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