[Elecraft] APF Results at an Old Timer's shack

[Bill VanAlstyne W5WVO]

This method does diminish the ringing -- offsetting the APF peak using SHIFT 
and the receive frequency using RIT. 20 Hz seems to be about right, too. The 
bad ringing only occurs when the peak frequency and the center of the 
passband coincide exactly. I had a lot of fun this morning, right after 
installing the new firmware, listening in on a guy in 9-land running JAs on 
40 CW, tuning in the weaker JAs with the APF shift inside the 200 Hz IF 
passband. Really cool. Being able to tune the peak in 5-Hz increments will 
be especially cool, so I'm looking forward to the next update.

Whether you respond positively or negatively to the characteristics of a 
narrow passband seems to be a very individual thing. I've even heard guys 
say they prefer to copy CW in a wide-open SSB width passband, filtering out 
QRM only with their "wetware". Been there, done that. I cut my eye-teeth as 
a Novice in the early 1960s doing this because I didn't have any other 
choice; my cheap-o NC-60 receiver didn't have any selectivity to speak of. 
But I began to appreciate selectivity as soon as I started experiencing it, 
and since then, it's been "the more the better." I love the new APF! It 
reminds me of how the "peak" function in the old Heathkit QF-1 Q-Multiplier 
used to work and sound, except it's even better.

Bill W5WVO


-----Original Message----- 
From: drewko
Sent: Thursday, November 04, 2010 16:10
To: Elecraft at mailman.qth.net
Subject: Re: [Elecraft] APF Results at an Old Timer's shack

There was a suggestion posted within the last few days to reduce the
ring by adjusting the APF SHIFT along with RIT by 20 Hz. This might
make a nice one--push macro but I don't think there is a APF SHIFT
command available yet (The IF SHIFT command does not work in APF.)

Also, for for those who  want less ringing you can try a wider WIDTH.
If your CW bandwidth is typically set at 500 Hz or less try opeining
the WIDTH to 1-2 KHz when using APF, if the conditions permit.

73,
Drew
AF2Z


On Thu, 04 Nov 2010 11:32:53 -0400, Greg - AB7R wrote:

>I don't see this as something that would be left on ALL the time.  Only 
>used as needed.  It does help make an
>otherwise unworkable station readable for a contact.  Just another tool in 
>the box.  When you don't need it, turn it off.  I have not tried this yet
>but you can probably turn it off with a CAT command in the appropriate 
>logger macro in the same way you CLEAR RIT.  Then just turn it on as 
>needed.
>
>-------------------------
>73,
>Greg - AB7R
>Whidbey Island WA
>NA-065
>

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