[R-390] More USB & LSB Filters

[Dallas Lankford]

Yes, the labels are not Collins labels.  The Collins (blue) labels were
removed so that I could solder the flanges to the filter bodies.
Unfortunately, the labels could not be reused.  So I typed new labels and
put them on the filters, mainly for (my) reference.  My Collins filter data
lists the ...64 000 as a Z-4, not a Z-1.  I didn't measure the 3 dB
bandwidths (the 2.7 value is called "nominal" by Collins in my data).  I
measured the 6 dB BW's of the ... 000's and got 3.4 and 3.6 kHz
respectively.  Since it didn't matter due to my roofing filter, I called
them both 3.4's.  The worst I got for one of the ... 061's was 4.0 kHz.  But
like I said, if you use a 6 kHz roofing filter at the input to the IF deck,
then any of these filters will be like a 3.0 kHz filter.  Incidentally,
measuring deep skirt BW's of these high impedance filters is quite difficult
because of RF leakage.  Special test fixtures are required to get accurate
results.

Best regards,

Dallas

----- Original Message -----
From: "John Kolb" <jlkolb@cts.com>

<cut>

>
> The labels on the 64-000 and 65-000 in Dallas's modification
> article list a BW of 3.4 kHz on the label, but the label from
> what I can see of it, doesn't look like an offical Collins label.

<cut>

>The 1976 Collins Mechanical Filter Catalog lists the 526 9364 000
>as a F455Z-1, USB 2.7 kHz @ 3db Y(long) case, and the 526 6365 000
>as a F455Z-5, LSB 2.7 kHz @ 3db Y(long) case.