Hot Carrier or Shottky(?) diode recommendations?

[Terry Williams]

I'll broadcast this, only because this diode has come up before and (understandably) will again.  Your question got my curiosity up, and I dug a little.  The short version appears to be that 1N191 is a germanium that's hard to beat for linearity across a wide band.  Comparable to it is a 1N5711 hot carrier, that's available from Mouser.  Digitron shows availbility of 191s, but I don't what their price or minimum quantity are.

Take a look at a K2 application note from Elecraft:
http://www.elecraft.com/Apps/RF_Det_application_note.htm
and an item from this list from last July:
http://listserv.tempe.gov/admin/WA.EXE?A2=ind0507&L=heath&F=P&S=&P=8538
Both are educational.  Thanks for making me look!
73,
Terry
-------------- Original message -------------- 

> Hi, 
> 
> 
> 
> Can someone recommend a very good upgrade to the usual 1N191 diode Heath 
> used in detectors and ring modulators? I would like something with a 
> much lower forward drop, and a very fast recovery time, but one that 
> will still stand up to all the various reverse voltages and forward 
> currents (or better for both) that 1N191 was expected to survive in 
> Heath equipment. 
> 
> 
> 
> I believe what I want is a so called 'Hot Carrier Diode' (Schottky?). 
> I've heard HP and NTE may have cross references for the Hp ones - but I 
> don't really know. But which one would be a good replacement for the 
> 1N191 over the HF range (or HF range and higher if it can do it)? Is 
> there a generally recognized one that people here have gravitated to as 
> the gold standard for replacing the 1N191? I only need two or three of 
> them, so if they are slightly on the expensive side I still wouldn't 
> mind. 
> 
> 
> 
> And a source would be appreciated. But they have to be non-surface 
> mount type with 'regular' leads. 
> 
> 
> 
> Thanks You. 
> 
> --- Rob VE3JQL 

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