[R-390] More USB & LSB Filters

[John Kolb]

Ah, while my '76 Collins catalog said the 526-9364-000 was a
F455Z-1, the '71 catalog did say it was a Z-4. I would expect it
to be a Z-4 to mate with the Z-5 as a pair. Can't even always
believe the factory literature.

Just won a couple of Z-4's on ebay - hope I can find something
to pair them with.

John

On Wed, 24 Dec 2003, Dallas Lankford wrote:

> 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.
>
>