[Boatanchors] Questions on the Heath HN-31 Cantenna

[Jacques Fortin]

Hi Bob,

Well... maybe.
1- Several diodes in series increase the voltage drop for the same current (so eating the advantage of using a low forward drop diode).
2- two 50 PIV diodes in series hardly equals to a 100 PIV one, because all depends on the reverse leakage value for each diode. Meaning that if you have, for example, one of the two 50 PIV diodes which have 10nA of reverse current at 50V and that the other one in series having the same 10nA of reverse current at only 25V, all you can get is a "75 PIV" diode, not a 100 PIV one.. To have a 100 PIV compound diode made of two 50 PIV ones, their "reverse" characteristics have to be equal (hard to find.. try it).

73, Jacques, VE2JFE

-----Message d'origine-----
De : K5MYJ [mailto:macklinbob at gmail.com] 
Envoyé : 12 mars 2017 13:55
À : Boatanchors list <boatanchors at mailman.qth.net>; Jacques Fortin <jacques.f at videotron.ca>
Objet : Re: [Boatanchors] Questions on the Heath HN-31 Cantenna

But you can connect several in series!

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"

----- Original Message ----- 
From: "Jacques Fortin" <jacques.f at videotron.ca>
To: "'Glen Zook'" <gzook at yahoo.com>; "'Doug Hensley'" <w5jv at hotmail.com>
Cc: <boatanchors at mailman.qth.net>
Sent: Sunday, March 12, 2017 10:31 AM
Subject: Re: [Boatanchors] Questions on the Heath HN-31 Cantenna


> Yes, but...
> Not all the schottky have a PIV as high as 90V (or more), so beware about 
> the one you choose.
>
> 73, Jacques, VE2JFE
>
> -----Message d'origine-----
> De : Boatanchors [mailto:boatanchors-bounces at mailman.qth.net] De la part 
> de Glen Zook via Boatanchors
> Envoyé : 12 mars 2017 12:30
> À : Doug Hensley <w5jv at hotmail.com>; boatanchors mailman. qth. net 
> <boatanchors at mailman.qth.net>
> Objet : Re: [Boatanchors] Questions on the Heath HN-31 Cantenna
>
> Just put in a Schottky diode.  The calibration, of the circuit in the box, 
> is only relative.
>
> If the BNC works well with your other test equipment, then change the RCA 
> jack to a BNC.
> Glen, K9STH
> Website: http://k9sth.net
>
>      From: Doug Hensley <w5jv at hotmail.com>
> To: boatanchors mailman. qth. net <boatanchors at mailman.qth.net>
> Sent: Sunday, March 12, 2017 11:12 AM
> Subject: [Boatanchors] Questions on the Heath HN-31 Cantenna
>
> Heath listed a part in the small Bud box on top the Cantenna as part 
> number 56-26, Crystal Diode, Brown-White-Brown (191).  The reference or 
> two I have found was that this is a 1N191 90 PIV 5mA Germanium.  Is there 
> a modern substitute for this that improves on the diode or is finding an 
> original still the best choice?
>
>
> A related question: a BNC jack would be easier for me to work with rather 
> than the RCA jack when measuring voltage.  Can a "devil's advocate" 
> suggest an obvious reason why not?
>
>
> Thanks in advance for any suggestions.
>
>
>
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