[time-nuts] Why a 10MHz sinewave output?

Bob Camp lists at rtty.us
Tue Feb 7 23:13:10 UTC 2012


Hi

Modern gear often has high input standard plugs. People tend to daisy chain gear with T connectors. That makes for issues if they are all low impedance.

Bob



On Feb 7, 2012, at 5:31 PM, Chris Albertson <albertson.chris at gmail.com> wrote:

> On Tue, Feb 7, 2012 at 1:03 PM, Attila Kinali <attila at kinali.ch> wrote:
> 
>> Addendum: Your counter input is mostlikely 50R. Even if it just enters
>> a chip, as the chip itself should be matched to 50R. The input impedance
>> should be noted in the manual of the counter.
> 
> The counter specs say that any 2.5 volt or greater sine or TTL level
> square wave signal is acceptable.  I think they use a 74LS14 chip or
> something like that.     This counter was made in the 1980s, not quite
> current tech.
> 
> 
> Chris Albertson
> Redondo Beach, California
> 
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