[Collins] Two More 51J4 Questions

[Carl]

The early 455 3.1 filter and others as in the 75A3 had very high loss and 
were redesigned for the 75A4.

Whatever is in the 500kc 51J4 is inmaterial, they should all be close in 
loss.

Carl
KM1H



----- Original Message ----- 
From: "R PRECHTL K7DFW" <k7dfw at clatskanie.com>
To: <collins at mailman.qth.net>
Sent: Friday, August 23, 2013 2:46 PM
Subject: Re: [Collins] Two More 51J4 Questions


>
>
>> I don't think the filters should be that different.
>
> A few dB difference would be normal. 17 dB sounds wildly off to me.
>
> ---------------------------------------------------------------------------------------------------
>
> In a General Catalog dated 1957, filter losses are said to be 10 to 12db.
>
> But........in a printout of individual filters (obtained from the Collins
> Collectors Magazine of the early '90s) the 526-9089-000, F455J-31, the
> insertion loss is listed as 24db.
>
> This is in the same general area as the filters for the 51J-4, R390A and
> S/KWM lines, which are listed in this chart with a range of 20 to 36db
> insertion loss.
>
> ------>20 to 36db<------
>
> K7DFW
>
>
> ..._._
>
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