Rockmite 20: inductor parrallel with D1/D2

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From: Terres Family (terresfm@ncia.net)
Date: Sat Sep 28 2002 - 03:44:39 CDT


Has anyone tried the 10uH mod to decrease SWBC interference? Does it
matter if it's a Rockmite 20 or a 40? i.e. does a 40 meter get 10uH, and
a 20 meter get 4.7uH? It sounds like too much inductance in the same
spot will have the opposite effect.

Thanks,
jerry aa1of

What I have seen so far on the list:

Thanks for the suggestion. I'd recommended adding inductance in parallel
with D1/D2- 10 uH looks like a good value, but I haven't had a chance to
check for interaction with the passband characteristics. In the
discussions I had with someone else on the topic, it eliminated AM BC
pickup completely.

An inductance (22 uH) across D1/D2 will broaden out the filter response
to VXO-width. [It has some detrimental effect on filter ultimate
rejection, i,e, may let more SWBC energy get to the mixer.]


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