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Date: | Sat, 1 Feb 2014 13:21:03 -0700 |
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one would think so, however, there are a lot of other devices that produce noise that can be mixed down into the HF bands (either by interstage mixing or inter mod).. a low pass filter is still useful for reducing that incidental noise to acceptable levels. Also, when it comes to a phone patch, those are still useful (as cell phones don't work in all places).
I read this somewhere: "don't forget what you already know".
-eric
On Jan 31, 2014, at 11:31 PM, Howard Kaufman wrote:
> With modern radios and modern television, their is little need for a low
> pass filter.
> If you are going to use one, it should be as close to the transmit output as
> possible. With so few stations transmitting from channels 2 through 6, and
> the modern rigs having both auto tune and internal tuner features, I think
> the low pass filter has gone the way of the phone patch, and the plate
> modulator.
>
>
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