[Elecraft] 756PRO filters v. K2

Thu Nov 28 10:23:04 2002

I also found the PRO's internal speaker to be lacking, Bob.  After testing a
half-dozen external speakers, I've been using a Radio Shack "bookshelf"
hi-if speaker and a ClearSpeech DSP. They work great.

The A/B comparisons I've done were very simple... tune in a difficult signal
as best it can be heard on one radio (using all the anti-QRM features
available), then switch the same antenna to the other radio and do the same.
Then go back and forth between them as desired.  I should say in MOST cases
the comparisons were done on SSB signals, not CW.

73... Ed, W5EJ

----- Original Message -----
From: "Bob Lewis (AA4PB)" <[email protected]>
To: <[email protected]>
Sent: Thursday, November 28, 2002 7:55 AM
Subject: Re: [Elecraft] 756PRO filters v. K2

> According to Icom, the very sharp skirts of the DSP filters permit one
> to tune close enough to a CW signal to detect the presence of
> sidebands (clicks). With wider skirts you begin to hear the tone which
> masks the clicks. That is why they offer the option of wider skirts on
> the PRO-II.
>
> The K2 certainly has superior dynamic range as documented by ARRL
> tests. I am amazed however that some are apparently finding the simple
> crystal lattice filter to have superior performance to IF DSP. I doubt
> that anyone will be able to implement IF DSP at the low receive
> current of the K2 (it was originally designed with battery operation
> in mind) - at least not with current technology.
>
> What are people doing A/B tests using for a speaker? I find the Icom
> SP-20 makes a huge difference with the 756PRO audio quality (as
> compared to its internal top-firing speaker) and I used it (as well as
> the same antenna) for A/B comparisons with the K2.
>
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