Varactor Diodes on the K2 RF board

[EMD]

I have noticed that I seem to have 2 different types of the 1SV149 Varactor Diodes.  I have a mix of V1498M and a slightly thicker bodied V149SL. Is there a difference in these 2 components?  I have already installed a mix.  I think what happened is when I ordered my K2 I got an email indicating that I did not receive these components, but as it turns out I did.  So I think what I have done is mixed them.

73,
Ed KE7HGA

[Don Wilhelm-4]

  Ed,

I would suggest leaving all but the ones around the crystal filter as
you have them now, but use all the thicker-bodied ones for the filter -
the filter characteristic will benefit.

The ones with the thinner bodies have a different voltage to capacitance
characteristic than those with the thick bodies.

You were wise to ask.

73,
Don W3FPR

On 3/14/2011 5:37 PM, EMD wrote:

> I have noticed that I seem to have 2 different types of the 1SV149 Varactor
> Diodes.  I have a mix of V1498M and a slightly thicker bodied V149SL. Is
> there a difference in these 2 components?  I have already installed a mix.
> I think what happened is when I ordered my K2 I got an email indicating that
> I did not receive these components, but as it turns out I did.  So I think
> what I have done is mixed them.
>
> 73,
> Ed KE7HGA
>

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