[1000mp] Inrad 1 kHz filter?

[1000mp@mailman.qth.net]

Hello Bill,

Thanks for the very usefull suggestions! It is familiar to me and this
certainly is a very good alternative. With the dual Inrad 2.1 filters which
I have it works very good indeed. I must try this way during a contest to
learn more about it.

My opinion is that the step between 2.1 kHz and 400 Hz is very large and the
step between 400 Hz and 250 Hz is somewhat small. This is one of the reasons
that the filter configuration '2.1 - 1.0 - 400 (and after that the EDSP/APF
240/120/60)' seems to me the most perfect one for CW.

73,
Hans.

Ham Radio:
PA1HR

Sites:
www.remeeus.nl
www.qsl.net/pa1hr

e-mail:
hans@remeeus.nl


----- Original Message -----
From: "Bill Tippett" <btippett@alum.mit.edu>
To: <1000mp@mailman.qth.net>
Sent: Friday, August 23, 2002 12:32 AM
Subject: Re: [1000mp] Inrad 1 kHz filter?


> PA1HR wrote:
>
> >When I join a CW contest I use the 400 Hz filters now. But I must say
that
> some stations are just beside the passband of the 400 Hz filter. 1 kHz
> bandwidth for normal use would be excellent!
>
>         Hans, there is another way to accomplish this without the
> 1 kHz filter.  If you have dual 1.8/2.0/2.4 kHz filters, turn both
> Shift and Width knobs fully CW (for LSB CW) or fully CCW (for USB CW).
> This gives you a very wide skirted filter which is around 500 Hz at
> the top and much wider at the bottom.  This will allow you to easily
> hear guys that call 500 Hz off frequency once you learn to use it.
> I normally set Pitch to about 450 Hz, A=B, and then tune the RX VFO A
> to ~200 Hz above TX VFO B (for LSB CW).  For USB CW you would set VFO
> A below VFO B.  I use VFO A's large knob for tuning the RX instead
> of the very tiny RIT knob.
>
>         I have dual 2.4's, dual 2.0's, dual 400/500 and dual 250's in
> my MP (original).  My normal contest mode in CW is dual 2.0's as described
> above.  Only under extreme conditions do I ever need to go to the 400/500
> position, and I never use the 250's in a contest.  I do use the 250's
> rarely on 160 for extremely weak DX signals.
>
>         One problem with the above...if you are using the shifted 2.0
> mode and need to go to the 400/500 pair, you must reset Shift and Width
> back to their normal center positions.
>
>         Anyway, if you have dual SSB filters (even stock), you might
> give the above a try and see if you like it.  K3ZO is the guy who
> first described this BTW.
>
>                                                 73,  Bill  W4ZV
>
> P.S.  I hold current USA SOSB records on 10 CW for CQ WW, ARRL DX and
> WPX, so it does work!
>
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