SB-102 with Lo-Pass filter

[R. L. Blaney]

The PI network output of the more modern rigs is indeed a low pass filter.
However, nothing made by man is perfect.  The PI net output tank is no
exception and is more or less a compramise, depending on how heavily the rig
is loaded.   Loading the rig very heavily could result in the "working Q"
being  so low as to permit some unwanted signals to get to the antenna and
be radiated.  With a low-pass filter in the line, those unwanted or spurious
componants of the signal would be reduced many more dB.  I have 3 lowpass
filters, 1 kw B&W, 1 kw Bud, and a 300 watt Drake.  One is always in line
when I'm on the air.  It may not do any good, but sure is good insurance.
Hope this helps.  73 es gud hamming, de
Dick, WB8MHE
wb8mhe at bright.net

-----Original Message-----
From: Allen & Matt <mattall at CWNET.COM>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Wednesday, July 15, 1998 3:04 PM
Subject: SB-102 with Lo-Pass filter


>Hi Group--
>
>I've been led to believe that one should always use
>a low-pass filter on the output of the rig to help
>minimize TVI--especially when the neighborhood does
>not have cable.
>
>Is this really true?
>(Assume a doublet antenna, balanced feedlines, ant. tuner.)
>
>As most older rigs, this one has pi-out. Is that, in
>itself, low-pass?
>
>Does the filter really make a difference *in the real
>world*?
>
>How about you SB-users who have no lo-pass filter!
>Do you have particular problems with TVI?
>
>Thanks for info and help!
>
>Rev. Allen
>--
>* * * * * * * * * * * * * * * *
>73 de Allen, KJ6XH, and Matt                  West Sacramento, CA
>               email:     mattall at cwnet.com
>               http://users.cwnet.com/mattall
>
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