[CQ-Contest] Collins Filters in Contest Rigs

[George Cutsogeorge]

Here are some measured numbers for those of us that like to see data. 
Mechanical filters have bandwidths specified at -3 dB and crystal filters
are specified at -6 dB.  To make the comparison, both types were measured
at -6 dB.

Filter                         -6 dB        -60 dB    Loss, dB

Collins "500 Hz"          600          1500         2.2
Inrad 703                    400            745         3.3

Collins "2.6 kHz"       2700           5200        1.4
Inrad 702                  2150           3300        3.6

George
w2vjn at rosenet.net

Yes, I am associated with International Radio.
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>From Carsten Steinhoefel" <carsten.steinhoefel at essen.netsurf.de  Tue Aug 11 17:21:07 1998
From: Carsten Steinhoefel" <carsten.steinhoefel at essen.netsurf.de (=?iso-8859-0?q?Carsten_Steinh=94fel?=)
Date: Tue, 11 Aug 1998 16:21:07 +0000
Subject: [CQ-Contest] DH prefix?
Message-ID: <199808111623.SAA22004 at mail.castrop-rauxel.netsurf.de>


On Mon, 10 Aug 1998 22:49:52 +0100, Barry Kutner wrote:

>
>I wonder if one of our German friends could comment on the DH 
>prefix. I worked several this weekend in WAE. Is it just another 
>prefix like DJ, DK, DL, or something special?
>Tnx/Barry
>--
>Barry Kutner, W2UP              Internet: w2up at mindspring.com
>Newtown, PA         FRC         alternate: barry at w2up.wells.com
>
>
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>
>
>
Hi Barry!

The DH prefix was previously assigned to the German license class A
which had privileges on 10m and parts of 15m and 80m with 100W, but
since 1st May 1998 class A licenses do not longer exist and were all
converted to class B, the highest class in DL with all HF privileges.
So now it IS just another prefix like DL etc.

Best 73, Carsten, DL1EFD

carsten.steinhoefel at essen.netsurf.de




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