[TenTec] Low Pass Filter
DAVID HELLER
dtx at verizon.net
Tue May 20 23:48:47 EDT 2008
The best practical comment I've seen on this subject. K3TX
----- Original Message -----
From: "Rick Denney" <rick at rickdenney.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, May 19, 2008 3:50 PM
Subject: Re: [TenTec] Low Pass Filter
> Bob Close writes...
>
>> IF the transceiver had harmonics and those were transferred to the
>> linear,
>> would they not be amplified by a factor of ten?
>
> Seems to me a low-pass filter is not a band-pass filter, and isn't
> there for normal attenuation of close-in spurs. It seems to me there
> for attenuating VHF spurs above 30 MHz so that they don't get into
> nearby TV's or FM radios (or cordless phones, stereo speakers, etc.)
> Those spurs should be pretty small to begin with for well-designed
> stuff that isn't overdriven, and a single low-pass filter on the
> output is enough to clean up any little bit that is there.
>
> The only low-pass filter I have is the low-pass effect of my Ten Tec
> 229 tuner with its L network. We see no RFI on our TV. I doubt that
> any more low-pass filtering would be of much use.
>
> Rick "lucky to live in a rural area" Denney
>
>
>
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