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Inrad 1500Hz filter for the K3

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Bob - W0GI

Inrad 1500Hz filter for the K3

Well they are out of stock, so the filter must be pretty good, or at
least popular.

I have read nothing but good about this filter, though it seems to be a
bit narrow for SSB, or that is what history tells me.

Any bad on this filter?

I would actually like to put one in the K3 and also the Mark-V, as they
share a common IF frequency ( 8125 kHz ).

Not looking for Hi-FI, just the best blocking that will still give an
intelligible SSB signal.

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Brett Howard

Re: Inrad 1500Hz filter for the K3

Works great for SSB on my K3... I replaced my 1.8K filters in my setups
with 1.5K filters and find them to be very nice for SSB use.

I have a hard time faulting the filter in any way... I was able to see
what 1.5K would be like using the DSP in the k3 and then bought the
filters to protect things at that level...

I found that I often ran my 1.8K filters at 1.6 or 1.7K and found that
the 1.8K filter sounded like it should be engaged at around 1.9K this is
what made me think the 1.5K filter would be fun to have.

~Brett

On Thu, 2010-01-28 at 18:53 -0700, Bob Stonesifer wrote:

> so the filter must be pretty good, or at
> least popular.
>
> I have read nothing but good about this filter, though it seems to be
> a
> bit narrow for SSB, or that is what history tells me.
>
> Any bad on this filter?
>
> I would actually like to put one in the K3 and also the Mark-V, as
> they
> share a common IF frequency ( 8125 kHz ).
>
> Not looking for Hi-FI, just the best blocking that will still give an
> intelligible SSB signal.

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Buck - k4ia

Re: Inrad 1500Hz filter for the K3

In reply to this post by Bob - W0GI

It is narrow but you slew the passband shift over so the max
intelligibility matches up with the center of the audio (not necessarily with the center
of the filter) and you can copy SSB with a 1.1 khz filter. Play with it
you will be amazed. The intelligible portion of audio is really quite
narrow.

Buck
k4ia
k3# 101

In a message dated 1/28/2010 9:33:44 P.M. Eastern Standard Time,
[hidden email] writes:

Well they are out of stock, so the filter must be pretty good, or at
least popular.

I have read nothing but good about this filter, though it seems to be a
bit narrow for SSB, or that is what history tells me.

Any bad on this filter?

I would actually like to put one in the K3 and also the Mark-V, as they
share a common IF frequency ( 8125 kHz ).

Not looking for Hi-FI, just the best blocking that will still give an
intelligible SSB signal.

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Guy, K2AV

Re: Inrad 1500Hz filter for the K3

You don't have to buy one to try it out. You can adjust the
SHIFT/WIDTH controls to see what it sounds like. Having a narrow
roofing filter pays off in a contest or other heavy operating
conditions to keep something loud in the space between the roofing
bandwidth and DSP bandwidth from pumping the hardware AGC.

73, Guy.

On Thu, Jan 28, 2010 at 11:56 PM, <[hidden email]> wrote:

>
> It is narrow but you slew the passband shift over so the max
> intelligibility matches up with the center of the audio (not necessarily with the center
> of the filter) and you can copy SSB with a 1.1 khz filter. Play with it
> you will be amazed. The intelligible portion of audio is really quite
> narrow.
>
> Buck
> k4ia
> k3# 101
>
>
>
> In a message dated 1/28/2010 9:33:44 P.M. Eastern Standard Time,
> [hidden email] writes:
>
> Well they are out of stock, so the filter must be pretty good, or at
> least popular.
>
> I have read nothing but good about this filter, though it seems to be a
> bit narrow for SSB, or that is what history tells me.
>
> Any bad on this filter?
>
> I would actually like to put one in the K3 and also the Mark-V, as they
> share a common IF frequency ( 8125 kHz ).
>
> Not looking for Hi-FI, just the best blocking that will still give an
> intelligible SSB signal.
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>