[time-nuts] 75Z vs 50Z for GPS receivers

[Didier Juges]

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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>
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