[time-nuts] 75Z vs 50Z for GPS receivers
Brooke Clarke
brooke at pacific.net
Mon Feb 5 23:20:53 EST 2007
Hi Didiere:
There's also an app note at Linear Technology for making pulses so fast
they are used to calibrate sampling scopes.
Some years ago I made a very simple circuit that pulses a LED with many
amps (very short time) based on a transistor going into avalanche.
Have Fun,
Brooke Clarke
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
Didier Juges wrote:
>Bruce,
>
>I finally found the time to google for avalanche pulse generator and
>found an App note from Zetex on the subject.
>I was not familiar with this technology, but it seems interesting.
>Amazing that you can get 50A pulses with sub-ns rise time out of a
>device in an SOT-23 (or TO-92) package!
>
>I have uploaded the app note to
>http://www.ko4bb.com/Test_Equipment/AvalanchePulser
>
>Now, I just need a scope fast enough to take advantage of such a short
>rise time. Back to eBay again :-)
>
>Didier
>
>Dr Bruce Griffiths wrote:
>
>
>>Didier
>>
>>You can always build your own 100A avalanche transistor pulser using
>>several Zetex FMMT413s.
>>
>>Bruce
>>
>>Brooke Clarke wrote:
>>
>>
>>
>>>Hi Didier:
>>>
>>>Yes they are on eBay. The tunnel diode models have a narrower pulse
>>>than the later models that use something more rugged. Probably for all
>>>practical purposes one of the newer ones would work well and last
>>>better. I think the military bought boat loads of these and I've heard
>>>from a number of people that use them and like them a lot.
>>>
>>>Have Fun,
>>>
>>>Brooke Clarke
>>>
>>>w/Java http://www.PRC68.com
>>>w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
>>>http://www.precisionclock.com
>>>
>>>
>>>
>>>Didier Juges wrote:
>>>
>>>
>>>
>>>
>>>
>>>>Going over the spec for the 1502, it seems like a nice instrument. I am
>>>>worried about the fragility of the tunnel diode though. When my neighbor
>>>>AD4TK fires up his amplifier, I have measured up to 1W of his signal
>>>>going down my feedline (on the 80m slopper antenna)...
>>>>
>>>>Are these things on eBay?
>>>>
>>>>Didier KO4BB
>>>>
>>>>Brooke Clarke wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>Hi Didier:
>>>>>
>>>>>The Tek 1502 is great for doing this, especially if you have the
>>>>>optional strip chart recorder. It's what it was made to do.
>>>>>http://www.pacificsites.com/~brooke/Tek1502.shtml
>>>>>
>>>>>Have Fun,
>>>>>
>>>>>Brooke Clarke
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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