Re: {Collins} wanted specs re collins mechanical filter



What’s still missing is the shunt (resonating) capacitance.  The  generic 130 PF may not apply.

73, Mike

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From: Jim Jones
Sent: Monday, October 10, 2016 5:58 AM
To: 'A R'; collins@xxxxxxxxxxxxx; crc@xxxxxxxxxxxx
Subject: Re: {Collins} wanted specs re collins mechanical filter

The "dash number" may change because of different inspection/test
requirements or unique marking or nameplates.

73
Jim w0nkn

-----Original Message-----
From: Collins [mailto:collins-bounces+jonesjames=imonmail.com@xxxxxxxxxxxxx]
On Behalf Of A R
Sent: Monday, October 10, 2016 12:35 AM
To: collins@xxxxxxxxxxxxx; crc@xxxxxxxxxxxx
Subject: Re: {Collins} wanted specs re collins mechanical filter

Fern,

Referencing the data in my filter catalog #1001709-001F20 dated Sept 1974:
Filter type F455FD-19, p/n 526-9691-010 is a symmetrical bandpass filter
with 1.9KHz@3dB and 5.4KHz@60dB pass characteristics. The data in the
referenced catalog suggests* that there is no difference in center frequency
or bandwidth characteristics between filters that share the same type
designations and  p/n first 7 digits but have 010 vs 020 last three digits
in the p/n.

*Example: p/n's 526-9685-010 and 526-9685-020 carry the same Type
designation F450V-60F, and identical center frequency and 6dB/60dB bandwidth
characterisrics. So, the 010 doesn't appear to be differentiated from the
020 insofar as center frequency or bandpass characteristics.

So...how does an "010" filter differ from an "020" filter that carries the
same type designation and same first 7 digits of the p/n? The catalog data
suggests that center frequency and bandwidth characteristics do not differ.
Not enough data in the catalog to answer that question.

Your filter appears to be a symmetrical filter with 455KHz center frequency
with BP characteristics of 1.9KHz@3dB and 5.4KHz@60dB.

73,
Allen--W7GIF
----- Original Message -----
From: Fern Rivard<mailto:crc@xxxxxxxxxxxx>
To: collins@xxxxxxxxxxxxx<mailto:collins@xxxxxxxxxxxxx>
Sent: Sunday, October 09, 2016 8:28 PM
Subject: {Collins} wanted specs re collins mechanical filter

I have a collins mechanical filter (blue tag) part #526-9691-020 F455FD19
and would like to have the specs on it.
I have not been able to find any info on this filter.
I think that it is 455 khz I F and possibly 1.9khz bandwidth but don't know
if it's symmetrical or ?
73 from Fern  VE7GZ

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