Re: 2.7 vs. 2.8 vs. 1.8 & 2.1

[Fred Atchley]

Bill, K9YEQ wrote: Is anyone using the 2.8 and

2.1/1.8 filters and what is the on-the-air experience?

End snip

I have 5 of the 8-pole filters: 2.8, 2.1, 1.8, 400 & 250. As the bands get
more crowded (I.e. contest) I just tighten down the bandwidth. Of course a
wider BW sounds better (especially to these old ears) but sometimes you do
what you got to do. Except for the 2.8, I set the BW a little higher: I.e.
2.1 is set for 2.4; 1.8 is set for 2.1; 400 is set for 500; and the 250 is
set for 300. All these filters give me the "wiggle room" and the "brick
wall" as needed.

73, AE6IC, K3 2241

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[Bill K9YEQ]

Fred,

That is more information than I got from the Archive, so thank you!  It
confirms my need to add the 1.8 8 pole. I have my K3 in for updating so
can't fiddle with it... I don't recall that one can remember the settings
for each filter and the bandwidth, so do you handle that via macro?

Bill
K9YEQ


-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Fred Atchley
Sent: Monday, April 12, 2010 3:40 PM
To: [hidden email]
Subject: Re: [Elecraft] 2.7 vs. 2.8 vs. 1.8 & 2.1

Bill, K9YEQ wrote: Is anyone using the 2.8 and

2.1/1.8 filters and what is the on-the-air experience?

End snip

I have 5 of the 8-pole filters: 2.8, 2.1, 1.8, 400 & 250. As the bands get
more crowded (I.e. contest) I just tighten down the bandwidth. Of course a
wider BW sounds better (especially to these old ears) but sometimes you do
what you got to do. Except for the 2.8, I set the BW a little higher: I.e.
2.1 is set for 2.4; 1.8 is set for 2.1; 400 is set for 500; and the 250 is
set for 300. All these filters give me the "wiggle room" and the "brick
wall" as needed.

73, AE6IC, K3 2241

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[Bill K9YEQ]

Jim,  THank you for the set up suggestion.  Will try it once I get my radio
back.

Bill
K9YEQ

-----Original Message-----
From: Jim Miller KG0KP [mailto:[hidden email]]
Sent: Monday, April 12, 2010 10:43 PM
To: Bill K9YEQ
Subject: Re: [Elecraft] 2.7 vs. 2.8 vs. 1.8 & 2.1

No problem.  When you install the filter you set the "cut in" frequency with

the utility.  Keep in mind the actual width of the filter vs the "named"
frequency, there IS a diffference.  There is documentation somewhere or you
can measure it, or I can look it up in my notes.  I usually set my filters
to "cut in" a bit above their actual width.  For instance, the 250 filters
are really 365 (if I remember correctly, and this is probably the one that
is the fartherest off. So I set it to cut in at 400 (good to know the freqs
because the 400 is about 435 so you DO NOT need both the 250 and the 400,
they are virtually the same).  As you narrow the bandwidth via the front
panel the radio automatically switches to the next filter as you reach your
specified cut in frequency (and the filter currrently in use it displayed on

the front panel).  You don't have to remember anything or turn it on
manually, it is all automatic.

I have the 2.7, 1.8 (set to 2.0 cut in), the 500 (set to come on at 550 I
think), and the 250 set to come in at 400.  I will be buying the 1000 next
so I have a bit wider receive when scanning for RTTY or CW, then narrow the
bandwidth if needed to work them.

GUD luck es 73, de Jim KG0KP


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