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[KAT1] 1N34 Diode replacement

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kratchkov

[KAT1] 1N34 Diode replacement

Hello group,

The 1N34 diode on my KAT has its glass broken. With what kind of diode can I
replace it? What kind of characteristics does it need?

73

Matthias hb9egm
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kratchkov

Re: [KAT1] 1N34 Diode replacement

I don't know if we're talking about the same diode.

The broken diode is not in the bridge used to measure fwd/rfl power.

I'm talking about D3, connecting the output of the buffer op-amp U2A to the
RFDET/DATA pin on P2. I don't know what it's for (what is RFDET/DATA ? I don't
have the K1 schematics right here).

I suppose I'll use a low-drop schottky, like 1N5711,

thanks to everyone for the advice

73,

matthias HB9EGM

Tom Hammond wrote:

> Matthias:
>
>> The 1N34 diode on my KAT has its glass broken. With what kind of
>> diode can I
>> replace it? What kind of characteristics does it need?
>
> In most instances a 1N5711 will be an acceptable replacement. But
> REPLACE BOTH
> diodes, not just the broken one. Important to have similar diodes on each
> side of the bridge.
>
> 73,
>
> Tom Hammond N0SS
>
>

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David Woolley (E.L)

Re: [KAT1] 1N34 Diode replacement

In reply to this post by kratchkov

kratchkov wrote:

> The 1N34 diode on my KAT has its glass broken. With what kind of diode can I
> replace it? What kind of characteristics does it need?

The best replacement is probably one ordered from Elecraft. They should
only charge letter post shipping for something like that.

However, it is a germanium point contact diode. (Schottky signal diodes
are almost as good, and I believe that is what is actually used in some
of the more recent Elecraft designs.)

--
David Woolley
"The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more general topics related ham radio"
List Guidelines <http://www.elecraft.com/elecraft_list_guidelines.htm>
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kratchkov

Re: [KAT1] 1N34 Diode replacement

In reply to this post by kratchkov

Great! I just found a OA95, so I replaced the diode.

Thanks for all the advice, wish you nice QSOs,

73

Matthias HB9EGM

Tim Heasman wrote:

> Hi Matthias,
>
> My little books has the following:
> aa118 aa134 aa144, oa85 oa91 oa95, or in618.
> It is 75V 5mA and germanium I think.
>
> 73
>
> tim
> gm4lmh
>
> ----- Original Message ----- From: "kratchkov" <[hidden email]>
> To: <[hidden email]>
> Sent: Tuesday, October 21, 2008 5:49 PM
> Subject: [Elecraft] [KAT1] 1N34 Diode replacement
>
>
>> Hello group,
>>
>> The 1N34 diode on my KAT has its glass broken. With what kind of
>> diode can I
>> replace it? What kind of characteristics does it need?
>>
>> 73
>>
>> Matthias hb9egm
>> _______________________________________________
>> Elecraft mailing list
>> Post to: [hidden email]
>> You must be a subscriber to post to the list.
>> Subscriber Info (Addr. Change, sub, unsub etc.):
>> http://mailman.qth.net/mailman/listinfo/elecraft
>>
>> Help: http://mailman.qth.net/subscribers.htm
>> Elecraft web page: http://www.elecraft.com
>
>